Merge pull request #273 from ajibade3210/nodeGraphql

Node graphql

core-java/junit5-parameterized-tests/.gitignore

@@ -0,0 +1,8 @@
+# Maven 
+target/
+.mvn/
+
+# eclipse project file
+.settings/
+.classpath
+.project

core-java/junit5-parameterized-tests/README.md

@@ -0,0 +1,3 @@
+# Related Blog Posts
+
+* [Parameterized tests with JUnit 5](https://reflectoring.io/junit5-parameterized-tests/)

core-java/junit5-parameterized-tests/mvnw

@@ -0,0 +1,287 @@
+#!/bin/sh
+# ----------------------------------------------------------------------------
+# Licensed to the Apache Software Foundation (ASF) under one
+# or more contributor license agreements.  See the NOTICE file
+# distributed with this work for additional information
+# regarding copyright ownership.  The ASF licenses this file
+# to you under the Apache License, Version 2.0 (the
+# "License"); you may not use this file except in compliance
+# with the License.  You may obtain a copy of the License at
+#
+#    http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing,
+# software distributed under the License is distributed on an
+# "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+# KIND, either express or implied.  See the License for the
+# specific language governing permissions and limitations
+# under the License.
+# ----------------------------------------------------------------------------
+
+# ----------------------------------------------------------------------------
+# Apache Maven Wrapper startup batch script, version 3.1.1
+#
+# Required ENV vars:
+# ------------------
+#   JAVA_HOME - location of a JDK home dir
+#
+# Optional ENV vars
+# -----------------
+#   MAVEN_OPTS - parameters passed to the Java VM when running Maven
+#     e.g. to debug Maven itself, use
+#       set MAVEN_OPTS=-Xdebug -Xrunjdwp:transport=dt_socket,server=y,suspend=y,address=8000
+#   MAVEN_SKIP_RC - flag to disable loading of mavenrc files
+# ----------------------------------------------------------------------------
+
+if [ -z "$MAVEN_SKIP_RC" ] ; then
+
+  if [ -f /usr/local/etc/mavenrc ] ; then
+    . /usr/local/etc/mavenrc
+  fi
+
+  if [ -f /etc/mavenrc ] ; then
+    . /etc/mavenrc
+  fi
+
+  if [ -f "$HOME/.mavenrc" ] ; then
+    . "$HOME/.mavenrc"
+  fi
+
+fi
+
+# OS specific support.  $var _must_ be set to either true or false.
+cygwin=false;
+darwin=false;
+mingw=false
+case "`uname`" in
+  CYGWIN*) cygwin=true ;;
+  MINGW*) mingw=true;;
+  Darwin*) darwin=true
+    # Use /usr/libexec/java_home if available, otherwise fall back to /Library/Java/Home
+    # See https://developer.apple.com/library/mac/qa/qa1170/_index.html
+    if [ -z "$JAVA_HOME" ]; then
+      if [ -x "/usr/libexec/java_home" ]; then
+        JAVA_HOME="`/usr/libexec/java_home`"; export JAVA_HOME
+      else
+        JAVA_HOME="/Library/Java/Home"; export JAVA_HOME
+      fi
+    fi
+    ;;
+esac
+
+if [ -z "$JAVA_HOME" ] ; then
+  if [ -r /etc/gentoo-release ] ; then
+    JAVA_HOME=`java-config --jre-home`
+  fi
+fi
+
+# For Cygwin, ensure paths are in UNIX format before anything is touched
+if $cygwin ; then
+  [ -n "$JAVA_HOME" ] &&
+    JAVA_HOME=`cygpath --unix "$JAVA_HOME"`
+  [ -n "$CLASSPATH" ] &&
+    CLASSPATH=`cygpath --path --unix "$CLASSPATH"`
+fi
+
+# For Mingw, ensure paths are in UNIX format before anything is touched
+if $mingw ; then
+  [ -n "$JAVA_HOME" ] &&
+    JAVA_HOME="`(cd "$JAVA_HOME"; pwd)`"
+fi
+
+if [ -z "$JAVA_HOME" ]; then
+  javaExecutable="`which javac`"
+  if [ -n "$javaExecutable" ] && ! [ "`expr \"$javaExecutable\" : '\([^ ]*\)'`" = "no" ]; then
+    # readlink(1) is not available as standard on Solaris 10.
+    readLink=`which readlink`
+    if [ ! `expr "$readLink" : '\([^ ]*\)'` = "no" ]; then
+      if $darwin ; then
+        javaHome="`dirname \"$javaExecutable\"`"
+        javaExecutable="`cd \"$javaHome\" && pwd -P`/javac"
+      else
+        javaExecutable="`readlink -f \"$javaExecutable\"`"
+      fi
+      javaHome="`dirname \"$javaExecutable\"`"
+      javaHome=`expr "$javaHome" : '\(.*\)/bin'`
+      JAVA_HOME="$javaHome"
+      export JAVA_HOME
+    fi
+  fi
+fi
+
+if [ -z "$JAVACMD" ] ; then
+  if [ -n "$JAVA_HOME"  ] ; then
+    if [ -x "$JAVA_HOME/jre/sh/java" ] ; then
+      # IBM's JDK on AIX uses strange locations for the executables
+      JAVACMD="$JAVA_HOME/jre/sh/java"
+    else
+      JAVACMD="$JAVA_HOME/bin/java"
+    fi
+  else
+    JAVACMD="`\\unset -f command; \\command -v java`"
+  fi
+fi
+
+if [ ! -x "$JAVACMD" ] ; then
+  echo "Error: JAVA_HOME is not defined correctly." >&2
+  echo "  We cannot execute $JAVACMD" >&2
+  exit 1
+fi
+
+if [ -z "$JAVA_HOME" ] ; then
+  echo "Warning: JAVA_HOME environment variable is not set."
+fi
+
+# traverses directory structure from process work directory to filesystem root
+# first directory with .mvn subdirectory is considered project base directory
+find_maven_basedir() {
+  if [ -z "$1" ]
+  then
+    echo "Path not specified to find_maven_basedir"
+    return 1
+  fi
+
+  basedir="$1"
+  wdir="$1"
+  while [ "$wdir" != '/' ] ; do
+    if [ -d "$wdir"/.mvn ] ; then
+      basedir=$wdir
+      break
+    fi
+    # workaround for JBEAP-8937 (on Solaris 10/Sparc)
+    if [ -d "${wdir}" ]; then
+      wdir=`cd "$wdir/.."; pwd`
+    fi
+    # end of workaround
+  done
+  printf '%s' "$(cd "$basedir"; pwd)"
+}
+
+# concatenates all lines of a file
+concat_lines() {
+  if [ -f "$1" ]; then
+    echo "$(tr -s '\n' ' ' < "$1")"
+  fi
+}
+
+BASE_DIR=$(find_maven_basedir "$(dirname $0)")
+if [ -z "$BASE_DIR" ]; then
+  exit 1;
+fi
+
+MAVEN_PROJECTBASEDIR=${MAVEN_BASEDIR:-"$BASE_DIR"}; export MAVEN_PROJECTBASEDIR
+if [ "$MVNW_VERBOSE" = true ]; then
+  echo $MAVEN_PROJECTBASEDIR
+fi
+
+##########################################################################################
+# Extension to allow automatically downloading the maven-wrapper.jar from Maven-central
+# This allows using the maven wrapper in projects that prohibit checking in binary data.
+##########################################################################################
+if [ -r "$BASE_DIR/.mvn/wrapper/maven-wrapper.jar" ]; then
+    if [ "$MVNW_VERBOSE" = true ]; then
+      echo "Found .mvn/wrapper/maven-wrapper.jar"
+    fi
+else
+    if [ "$MVNW_VERBOSE" = true ]; then
+      echo "Couldn't find .mvn/wrapper/maven-wrapper.jar, downloading it ..."
+    fi
+    if [ -n "$MVNW_REPOURL" ]; then
+      wrapperUrl="$MVNW_REPOURL/org/apache/maven/wrapper/maven-wrapper/3.1.1/maven-wrapper-3.1.1.jar"
+    else
+      wrapperUrl="https://repo.maven.apache.org/maven2/org/apache/maven/wrapper/maven-wrapper/3.1.1/maven-wrapper-3.1.1.jar"
+    fi
+    while IFS="=" read key value; do
+      case "$key" in (wrapperUrl) wrapperUrl="$value"; break ;;
+      esac
+    done < "$BASE_DIR/.mvn/wrapper/maven-wrapper.properties"
+    if [ "$MVNW_VERBOSE" = true ]; then
+      echo "Downloading from: $wrapperUrl"
+    fi
+    wrapperJarPath="$BASE_DIR/.mvn/wrapper/maven-wrapper.jar"
+    if $cygwin; then
+      wrapperJarPath=`cygpath --path --windows "$wrapperJarPath"`
+    fi
+
+    if command -v wget > /dev/null; then
+        QUIET="--quiet"
+        if [ "$MVNW_VERBOSE" = true ]; then
+          echo "Found wget ... using wget"
+          QUIET=""
+        fi
+        if [ -z "$MVNW_USERNAME" ] || [ -z "$MVNW_PASSWORD" ]; then
+            wget $QUIET "$wrapperUrl" -O "$wrapperJarPath"
+        else
+            wget $QUIET --http-user="$MVNW_USERNAME" --http-password="$MVNW_PASSWORD" "$wrapperUrl" -O "$wrapperJarPath"
+        fi
+        [ $? -eq 0 ] || rm -f "$wrapperJarPath"
+    elif command -v curl > /dev/null; then
+        QUIET="--silent"
+        if [ "$MVNW_VERBOSE" = true ]; then
+          echo "Found curl ... using curl"
+          QUIET=""
+        fi
+        if [ -z "$MVNW_USERNAME" ] || [ -z "$MVNW_PASSWORD" ]; then
+            curl $QUIET -o "$wrapperJarPath" "$wrapperUrl" -f -L
+        else
+            curl $QUIET --user "$MVNW_USERNAME:$MVNW_PASSWORD" -o "$wrapperJarPath" "$wrapperUrl" -f -L
+        fi
+        [ $? -eq 0 ] || rm -f "$wrapperJarPath"
+    else
+        if [ "$MVNW_VERBOSE" = true ]; then
+          echo "Falling back to using Java to download"
+        fi
+        javaSource="$BASE_DIR/.mvn/wrapper/MavenWrapperDownloader.java"
+        javaClass="$BASE_DIR/.mvn/wrapper/MavenWrapperDownloader.class"
+        # For Cygwin, switch paths to Windows format before running javac
+        if $cygwin; then
+          javaSource=`cygpath --path --windows "$javaSource"`
+          javaClass=`cygpath --path --windows "$javaClass"`
+        fi
+        if [ -e "$javaSource" ]; then
+            if [ ! -e "$javaClass" ]; then
+                if [ "$MVNW_VERBOSE" = true ]; then
+                  echo " - Compiling MavenWrapperDownloader.java ..."
+                fi
+                # Compiling the Java class
+                ("$JAVA_HOME/bin/javac" "$javaSource")
+            fi
+            if [ -e "$javaClass" ]; then
+                # Running the downloader
+                if [ "$MVNW_VERBOSE" = true ]; then
+                  echo " - Running MavenWrapperDownloader.java ..."
+                fi
+                ("$JAVA_HOME/bin/java" -cp .mvn/wrapper MavenWrapperDownloader "$MAVEN_PROJECTBASEDIR")
+            fi
+        fi
+    fi
+fi
+##########################################################################################
+# End of extension
+##########################################################################################
+
+MAVEN_OPTS="$(concat_lines "$MAVEN_PROJECTBASEDIR/.mvn/jvm.config") $MAVEN_OPTS"
+
+# For Cygwin, switch paths to Windows format before running java
+if $cygwin; then
+  [ -n "$JAVA_HOME" ] &&
+    JAVA_HOME=`cygpath --path --windows "$JAVA_HOME"`
+  [ -n "$CLASSPATH" ] &&
+    CLASSPATH=`cygpath --path --windows "$CLASSPATH"`
+  [ -n "$MAVEN_PROJECTBASEDIR" ] &&
+    MAVEN_PROJECTBASEDIR=`cygpath --path --windows "$MAVEN_PROJECTBASEDIR"`
+fi
+
+# Provide a "standardized" way to retrieve the CLI args that will
+# work with both Windows and non-Windows executions.
+MAVEN_CMD_LINE_ARGS="$MAVEN_CONFIG $@"
+export MAVEN_CMD_LINE_ARGS
+
+WRAPPER_LAUNCHER=org.apache.maven.wrapper.MavenWrapperMain
+
+exec "$JAVACMD" \
+  $MAVEN_OPTS \
+  $MAVEN_DEBUG_OPTS \
+  -classpath "$MAVEN_PROJECTBASEDIR/.mvn/wrapper/maven-wrapper.jar" \
+  "-Dmaven.multiModuleProjectDirectory=${MAVEN_PROJECTBASEDIR}" \
+  ${WRAPPER_LAUNCHER} $MAVEN_CONFIG "$@"

core-java/junit5-parameterized-tests/mvnw.cmd

@@ -0,0 +1,187 @@
+@REM ----------------------------------------------------------------------------
+@REM Licensed to the Apache Software Foundation (ASF) under one
+@REM or more contributor license agreements.  See the NOTICE file
+@REM distributed with this work for additional information
+@REM regarding copyright ownership.  The ASF licenses this file
+@REM to you under the Apache License, Version 2.0 (the
+@REM "License"); you may not use this file except in compliance
+@REM with the License.  You may obtain a copy of the License at
+@REM
+@REM    http://www.apache.org/licenses/LICENSE-2.0
+@REM
+@REM Unless required by applicable law or agreed to in writing,
+@REM software distributed under the License is distributed on an
+@REM "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+@REM KIND, either express or implied.  See the License for the
+@REM specific language governing permissions and limitations
+@REM under the License.
+@REM ----------------------------------------------------------------------------
+
+@REM ----------------------------------------------------------------------------
+@REM Apache Maven Wrapper startup batch script, version 3.1.1
+@REM
+@REM Required ENV vars:
+@REM JAVA_HOME - location of a JDK home dir
+@REM
+@REM Optional ENV vars
+@REM MAVEN_BATCH_ECHO - set to 'on' to enable the echoing of the batch commands
+@REM MAVEN_BATCH_PAUSE - set to 'on' to wait for a keystroke before ending
+@REM MAVEN_OPTS - parameters passed to the Java VM when running Maven
+@REM     e.g. to debug Maven itself, use
+@REM set MAVEN_OPTS=-Xdebug -Xrunjdwp:transport=dt_socket,server=y,suspend=y,address=8000
+@REM MAVEN_SKIP_RC - flag to disable loading of mavenrc files
+@REM ----------------------------------------------------------------------------
+
+@REM Begin all REM lines with '@' in case MAVEN_BATCH_ECHO is 'on'
+@echo off
+@REM set title of command window
+title %0
+@REM enable echoing by setting MAVEN_BATCH_ECHO to 'on'
+@if "%MAVEN_BATCH_ECHO%" == "on"  echo %MAVEN_BATCH_ECHO%
+
+@REM set %HOME% to equivalent of $HOME
+if "%HOME%" == "" (set "HOME=%HOMEDRIVE%%HOMEPATH%")
+
+@REM Execute a user defined script before this one
+if not "%MAVEN_SKIP_RC%" == "" goto skipRcPre
+@REM check for pre script, once with legacy .bat ending and once with .cmd ending
+if exist "%USERPROFILE%\mavenrc_pre.bat" call "%USERPROFILE%\mavenrc_pre.bat" %*
+if exist "%USERPROFILE%\mavenrc_pre.cmd" call "%USERPROFILE%\mavenrc_pre.cmd" %*
+:skipRcPre
+
+@setlocal
+
+set ERROR_CODE=0
+
+@REM To isolate internal variables from possible post scripts, we use another setlocal
+@setlocal
+
+@REM ==== START VALIDATION ====
+if not "%JAVA_HOME%" == "" goto OkJHome
+
+echo.
+echo Error: JAVA_HOME not found in your environment. >&2
+echo Please set the JAVA_HOME variable in your environment to match the >&2
+echo location of your Java installation. >&2
+echo.
+goto error
+
+:OkJHome
+if exist "%JAVA_HOME%\bin\java.exe" goto init
+
+echo.
+echo Error: JAVA_HOME is set to an invalid directory. >&2
+echo JAVA_HOME = "%JAVA_HOME%" >&2
+echo Please set the JAVA_HOME variable in your environment to match the >&2
+echo location of your Java installation. >&2
+echo.
+goto error
+
+@REM ==== END VALIDATION ====
+
+:init
+
+@REM Find the project base dir, i.e. the directory that contains the folder ".mvn".
+@REM Fallback to current working directory if not found.
+
+set MAVEN_PROJECTBASEDIR=%MAVEN_BASEDIR%
+IF NOT "%MAVEN_PROJECTBASEDIR%"=="" goto endDetectBaseDir
+
+set EXEC_DIR=%CD%
+set WDIR=%EXEC_DIR%
+:findBaseDir
+IF EXIST "%WDIR%"\.mvn goto baseDirFound
+cd ..
+IF "%WDIR%"=="%CD%" goto baseDirNotFound
+set WDIR=%CD%
+goto findBaseDir
+
+:baseDirFound
+set MAVEN_PROJECTBASEDIR=%WDIR%
+cd "%EXEC_DIR%"
+goto endDetectBaseDir
+
+:baseDirNotFound
+set MAVEN_PROJECTBASEDIR=%EXEC_DIR%
+cd "%EXEC_DIR%"
+
+:endDetectBaseDir
+
+IF NOT EXIST "%MAVEN_PROJECTBASEDIR%\.mvn\jvm.config" goto endReadAdditionalConfig
+
+@setlocal EnableExtensions EnableDelayedExpansion
+for /F "usebackq delims=" %%a in ("%MAVEN_PROJECTBASEDIR%\.mvn\jvm.config") do set JVM_CONFIG_MAVEN_PROPS=!JVM_CONFIG_MAVEN_PROPS! %%a
+@endlocal & set JVM_CONFIG_MAVEN_PROPS=%JVM_CONFIG_MAVEN_PROPS%
+
+:endReadAdditionalConfig
+
+SET MAVEN_JAVA_EXE="%JAVA_HOME%\bin\java.exe"
+set WRAPPER_JAR="%MAVEN_PROJECTBASEDIR%\.mvn\wrapper\maven-wrapper.jar"
+set WRAPPER_LAUNCHER=org.apache.maven.wrapper.MavenWrapperMain
+
+set WRAPPER_URL="https://repo.maven.apache.org/maven2/org/apache/maven/wrapper/maven-wrapper/3.1.1/maven-wrapper-3.1.1.jar"
+
+FOR /F "usebackq tokens=1,2 delims==" %%A IN ("%MAVEN_PROJECTBASEDIR%\.mvn\wrapper\maven-wrapper.properties") DO (
+    IF "%%A"=="wrapperUrl" SET WRAPPER_URL=%%B
+)
+
+@REM Extension to allow automatically downloading the maven-wrapper.jar from Maven-central
+@REM This allows using the maven wrapper in projects that prohibit checking in binary data.
+if exist %WRAPPER_JAR% (
+    if "%MVNW_VERBOSE%" == "true" (
+        echo Found %WRAPPER_JAR%
+    )
+) else (
+    if not "%MVNW_REPOURL%" == "" (
+        SET WRAPPER_URL="%MVNW_REPOURL%/org/apache/maven/wrapper/maven-wrapper/3.1.1/maven-wrapper-3.1.1.jar"
+    )
+    if "%MVNW_VERBOSE%" == "true" (
+        echo Couldn't find %WRAPPER_JAR%, downloading it ...
+        echo Downloading from: %WRAPPER_URL%
+    )
+
+    powershell -Command "&{"^
+		"$webclient = new-object System.Net.WebClient;"^
+		"if (-not ([string]::IsNullOrEmpty('%MVNW_USERNAME%') -and [string]::IsNullOrEmpty('%MVNW_PASSWORD%'))) {"^
+		"$webclient.Credentials = new-object System.Net.NetworkCredential('%MVNW_USERNAME%', '%MVNW_PASSWORD%');"^
+		"}"^
+		"[Net.ServicePointManager]::SecurityProtocol = [Net.SecurityProtocolType]::Tls12; $webclient.DownloadFile('%WRAPPER_URL%', '%WRAPPER_JAR%')"^
+		"}"
+    if "%MVNW_VERBOSE%" == "true" (
+        echo Finished downloading %WRAPPER_JAR%
+    )
+)
+@REM End of extension
+
+@REM Provide a "standardized" way to retrieve the CLI args that will
+@REM work with both Windows and non-Windows executions.
+set MAVEN_CMD_LINE_ARGS=%*
+
+%MAVEN_JAVA_EXE% ^
+  %JVM_CONFIG_MAVEN_PROPS% ^
+  %MAVEN_OPTS% ^
+  %MAVEN_DEBUG_OPTS% ^
+  -classpath %WRAPPER_JAR% ^
+  "-Dmaven.multiModuleProjectDirectory=%MAVEN_PROJECTBASEDIR%" ^
+  %WRAPPER_LAUNCHER% %MAVEN_CONFIG% %*
+if ERRORLEVEL 1 goto error
+goto end
+
+:error
+set ERROR_CODE=1
+
+:end
+@endlocal & set ERROR_CODE=%ERROR_CODE%
+
+if not "%MAVEN_SKIP_RC%"=="" goto skipRcPost
+@REM check for post script, once with legacy .bat ending and once with .cmd ending
+if exist "%USERPROFILE%\mavenrc_post.bat" call "%USERPROFILE%\mavenrc_post.bat"
+if exist "%USERPROFILE%\mavenrc_post.cmd" call "%USERPROFILE%\mavenrc_post.cmd"
+:skipRcPost
+
+@REM pause the script if MAVEN_BATCH_PAUSE is set to 'on'
+if "%MAVEN_BATCH_PAUSE%"=="on" pause
+
+if "%MAVEN_TERMINATE_CMD%"=="on" exit %ERROR_CODE%
+
+cmd /C exit /B %ERROR_CODE%

core-java/junit5-parameterized-tests/pom.xml

@@ -0,0 +1,33 @@
+<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 https://maven.apache.org/xsd/maven-4.0.0.xsd">
+	<modelVersion>4.0.0</modelVersion>
+	<groupId>io.refactoring</groupId>
+	<artifactId>junit5-parameterized-tests</artifactId>
+	<version>1.0.0-SNAPSHOT</version>
+	<properties>
+        <maven.compiler.source>11</maven.compiler.source>
+        <maven.compiler.target>11</maven.compiler.target>
+        
+		<junit-jupiter-params.version>5.9.2</junit-jupiter-params.version>
+		<commons-lang3.version>3.12.0</commons-lang3.version>
+		<assertj-core>3.24.1</assertj-core>
+	</properties>
+    
+	<dependencies>
+		<!-- https://mvnrepository.com/artifact/org.junit.jupiter/junit-jupiter-params -->
+		<dependency>
+			<groupId>org.junit.jupiter</groupId>
+			<artifactId>junit-jupiter-params</artifactId>
+			<version>${junit-jupiter-params.version}</version>
+			<scope>test</scope>
+		</dependency>
+		
+		<!-- https://mvnrepository.com/artifact/org.apache.commons/commons-lang3 -->
+		<dependency>
+			<groupId>org.apache.commons</groupId>
+			<artifactId>commons-lang3</artifactId>
+			<version>${commons-lang3.version}</version>
+		</dependency>
+		
+	</dependencies>
+	
+</project>

core-java/junit5-parameterized-tests/src/test/java/source/argument/conversion/ArgumentConversionTest.java

@@ -0,0 +1,43 @@
+package source.argument.conversion;
+
+import static org.junit.jupiter.api.Assertions.assertEquals;
+import static org.junit.jupiter.api.Assertions.assertNotNull;
+
+import java.time.temporal.ChronoUnit;
+
+import org.junit.jupiter.params.ParameterizedTest;
+import org.junit.jupiter.params.converter.ConvertWith;
+import org.junit.jupiter.params.provider.ValueSource;
+
+public class ArgumentConversionTest {
+
+	@ParameterizedTest
+	@ValueSource(ints = { 2, 4 })
+	void checkWideningArgumentConversion(long number) {
+		assertEquals(0, number % 2);
+	}
+
+	// ---------------------------------------------------------------------------
+
+	@ParameterizedTest
+	@ValueSource(strings = "DAYS")
+	void checkImplicitArgumentConversion(ChronoUnit argument) {
+		assertNotNull(argument.name());
+	}
+
+	// ---------------------------------------------------------------------------
+
+	@ParameterizedTest
+	@ValueSource(strings = { "Name1", "Name2" })
+	void checkImplicitFallbackArgumentConversion(Person person) {
+		assertNotNull(person.getName());
+	}
+
+	// ---------------------------------------------------------------------------
+
+	@ParameterizedTest
+	@ValueSource(ints = { 100 })
+	void checkExplicitArgumentConversion(@ConvertWith(StringSimpleArgumentConverter.class) String argument) {
+		assertEquals("100", argument);
+	}
+}

core-java/junit5-parameterized-tests/src/test/java/source/argument/conversion/Person.java

@@ -0,0 +1,18 @@
+package source.argument.conversion;
+
+public class Person {
+
+	private String name;
+
+	public Person(String name) {
+		this.name = name;
+	}
+
+	public String getName() {
+		return name;
+	}
+
+	public void setName(String name) {
+		this.name = name;
+	}
+}

core-java/junit5-parameterized-tests/src/test/java/source/argument/conversion/StringSimpleArgumentConverter.java

@@ -0,0 +1,13 @@
+package source.argument.conversion;
+
+import org.junit.jupiter.params.converter.ArgumentConversionException;
+import org.junit.jupiter.params.converter.SimpleArgumentConverter;
+
+public class StringSimpleArgumentConverter extends SimpleArgumentConverter {
+
+	@Override
+	protected Object convert(Object source, Class<?> targetType) throws ArgumentConversionException {
+		return String.valueOf(source);
+	}
+
+}

core-java/junit5-parameterized-tests/src/test/java/source/arguments/ArgumentsSourceTest.java

@@ -0,0 +1,39 @@
+package source.arguments;
+
+import static org.junit.jupiter.api.Assertions.assertEquals;
+
+import java.util.stream.Stream;
+
+import org.apache.commons.lang3.StringUtils;
+import org.junit.jupiter.api.extension.ExtensionContext;
+import org.junit.jupiter.params.ParameterizedTest;
+import org.junit.jupiter.params.provider.Arguments;
+import org.junit.jupiter.params.provider.ArgumentsProvider;
+import org.junit.jupiter.params.provider.ArgumentsSource;
+
+public class ArgumentsSourceTest {
+
+	@ParameterizedTest
+	@ArgumentsSource(ExternalArgumentsProvider.class)
+	void checkExternalArgumentsSource(int number, String expected) {
+		assertEquals(StringUtils.equals(expected, "even") ? 0 : 1, number % 2,
+				"Supplied number " + number + " is not an " + expected + " number");
+	}
+
+	// ---------------------------------------------------------------------------
+
+	@ParameterizedTest
+	@ArgumentsSource(NestedArgumentsProvider.class)
+	void checkNestedArgumentsSource(int number, String expected) {
+		assertEquals(StringUtils.equals(expected, "even") ? 0 : 1, number % 2,
+				"Supplied number " + number + " is not an " + expected + " number");
+	}
+
+	static class NestedArgumentsProvider implements ArgumentsProvider {
+
+		@Override
+		public Stream<? extends Arguments> provideArguments(ExtensionContext context) throws Exception {
+			return Stream.of(Arguments.of(2, "even"), Arguments.of(3, "odd"));
+		}
+	}
+}

core-java/junit5-parameterized-tests/src/test/java/source/arguments/ExternalArgumentsProvider.java

@@ -0,0 +1,16 @@
+package source.arguments;
+
+import java.util.stream.Stream;
+
+import org.junit.jupiter.api.extension.ExtensionContext;
+import org.junit.jupiter.params.provider.Arguments;
+import org.junit.jupiter.params.provider.ArgumentsProvider;
+
+public class ExternalArgumentsProvider implements ArgumentsProvider {
+
+	@Override
+	public Stream<? extends Arguments> provideArguments(ExtensionContext context) throws Exception {
+		return Stream.of(Arguments.of(2, "even"), 
+						 Arguments.of(3, "odd"));
+	}
+}

core-java/junit5-parameterized-tests/src/test/java/source/arguments/aggregator/ArgumentsAccessorTest.java

@@ -0,0 +1,18 @@
+package source.arguments.aggregator;
+
+import static org.junit.jupiter.api.Assertions.assertTrue;
+
+import org.junit.jupiter.params.ParameterizedTest;
+import org.junit.jupiter.params.aggregator.ArgumentsAccessor;
+import org.junit.jupiter.params.provider.CsvSource;
+
+public class ArgumentsAccessorTest {
+
+	@ParameterizedTest
+	@CsvSource({ "John, 20", 
+				 "Harry, 30" })
+	void checkArgumentsAccessor(ArgumentsAccessor arguments) {
+		Person person = new Person(arguments.getString(0), arguments.getInteger(1));
+		assertTrue(person.getAge() > 19, person.getName() + " is a teenager");
+	}
+}

core-java/junit5-parameterized-tests/src/test/java/source/arguments/aggregator/ArgumentsAggregatorTest.java

@@ -0,0 +1,24 @@
+package source.arguments.aggregator;
+
+import static org.junit.jupiter.api.Assertions.assertTrue;
+
+import org.junit.jupiter.params.ParameterizedTest;
+import org.junit.jupiter.params.aggregator.AggregateWith;
+import org.junit.jupiter.params.provider.CsvSource;
+
+public class ArgumentsAggregatorTest {
+
+	@ParameterizedTest
+	@CsvSource({ "John, 20", "Harry, 30" })
+	void checkArgumentsAggregator(@AggregateWith(PersonArgumentsAggregator.class) Person person) {
+		assertTrue(person.getAge() > 19, person.getName() + " is a teenager");
+	}
+
+	// ---------------------------------------------------------------------------
+
+	@ParameterizedTest
+	@CsvSource({ "John, 20", "Harry, 30" })
+	void checkCustomAggregatorAnnotation(@CsvToPerson Person person) {
+		assertTrue(person.getAge() > 19, person.getName() + " is a teenager");
+	}
+}

core-java/junit5-parameterized-tests/src/test/java/source/arguments/aggregator/CsvToPerson.java

@@ -0,0 +1,15 @@
+package source.arguments.aggregator;
+
+import java.lang.annotation.ElementType;
+import java.lang.annotation.Retention;
+import java.lang.annotation.RetentionPolicy;
+import java.lang.annotation.Target;
+
+import org.junit.jupiter.params.aggregator.AggregateWith;
+
+@Retention(RetentionPolicy.RUNTIME)
+@Target(ElementType.PARAMETER)
+@AggregateWith(PersonArgumentsAggregator.class)
+public @interface CsvToPerson {
+
+}

core-java/junit5-parameterized-tests/src/test/java/source/arguments/aggregator/Person.java

@@ -0,0 +1,30 @@
+package source.arguments.aggregator;
+
+public class Person {
+
+	private String name;
+
+	private int age;
+
+	public Person(String name, int age) {
+		this.name = name;
+		this.age = age;
+	}
+
+	public String getName() {
+		return name;
+	}
+
+	public void setName(String name) {
+		this.name = name;
+	}
+
+	public int getAge() {
+		return age;
+	}
+
+	public void setAge(int age) {
+		this.age = age;
+	}
+
+}

core-java/junit5-parameterized-tests/src/test/java/source/arguments/aggregator/PersonArgumentsAggregator.java

@@ -0,0 +1,16 @@
+package source.arguments.aggregator;
+
+import org.junit.jupiter.api.extension.ParameterContext;
+import org.junit.jupiter.params.aggregator.ArgumentsAccessor;
+import org.junit.jupiter.params.aggregator.ArgumentsAggregationException;
+import org.junit.jupiter.params.aggregator.ArgumentsAggregator;
+
+public class PersonArgumentsAggregator implements ArgumentsAggregator {
+
+	@Override
+	public Object aggregateArguments(ArgumentsAccessor arguments, ParameterContext context)
+			throws ArgumentsAggregationException {
+		return new Person(arguments.getString(0), arguments.getInteger(1));
+	}
+
+}

core-java/junit5-parameterized-tests/src/test/java/source/assertj/AssertJTest.java

@@ -0,0 +1,27 @@
+package source.assertj;
+
+import java.util.function.Consumer;
+import java.util.stream.Stream;
+
+import org.assertj.core.api.Assertions;
+import org.junit.jupiter.params.ParameterizedTest;
+import org.junit.jupiter.params.provider.Arguments;
+import org.junit.jupiter.params.provider.MethodSource;
+
+public class AssertJTest {
+
+	@ParameterizedTest
+	@MethodSource("checkNumberArgs")
+	void checkNumber(int number, Consumer<Integer> consumer) {
+
+		consumer.accept(number);
+	}
+
+	static Stream<Arguments> checkNumberArgs() {
+
+		Consumer<Integer> evenConsumer = i -> Assertions.assertThat(i % 2).isZero();
+		Consumer<Integer> oddConsumer = i -> Assertions.assertThat(i % 2).isEqualTo(1);
+
+		return Stream.of(Arguments.of(2, evenConsumer), Arguments.of(3, oddConsumer));
+	}
+}

core-java/junit5-parameterized-tests/src/test/java/source/csv/CsvSourceTest.java

@@ -0,0 +1,17 @@
+package source.csv;
+
+import static org.junit.jupiter.api.Assertions.assertEquals;
+
+import org.apache.commons.lang3.StringUtils;
+import org.junit.jupiter.params.ParameterizedTest;
+import org.junit.jupiter.params.provider.CsvSource;
+
+public class CsvSourceTest {
+
+	@ParameterizedTest
+	@CsvSource({ "2, even", 
+				 "3, odd"})
+	void checkCsvSource(int number, String expected) {
+		assertEquals(StringUtils.equals(expected, "even") ? 0 : 1, number % 2);
+	}
+}

core-java/junit5-parameterized-tests/src/test/java/source/csv/file/CsvFileSourceTest.java

@@ -0,0 +1,27 @@
+package source.csv.file;
+
+import static org.junit.jupiter.api.Assertions.assertEquals;
+
+import org.apache.commons.lang3.StringUtils;
+import org.junit.jupiter.params.ParameterizedTest;
+import org.junit.jupiter.params.provider.CsvFileSource;
+
+public class CsvFileSourceTest {
+
+	@ParameterizedTest
+	@CsvFileSource(files = "src/test/resources/csv-file-source.csv", numLinesToSkip = 1)
+	void checkCsvFileSource(int number, String expected) {
+		assertEquals(StringUtils.equals(expected, "even") ? 0 : 1, number % 2);
+	}
+
+	// ---------------------------------------------------------------------------
+
+	@ParameterizedTest
+	@CsvFileSource(files = "src/test/resources/csv-file-source_attributes.csv", 
+				   delimiterString = "|",
+				   lineSeparator = "||",
+				   numLinesToSkip = 1)
+	void checkCsvFileSourceAttributes(int number, String expected) {
+		assertEquals(StringUtils.equals(expected, "even") ? 0 : 1, number % 2);
+	}
+}

core-java/junit5-parameterized-tests/src/test/java/source/enumeration/EnumSourceTest.java

@@ -0,0 +1,25 @@
+package source.enumeration;
+
+import static org.junit.jupiter.api.Assertions.assertNotNull;
+
+import java.time.temporal.ChronoUnit;
+
+import org.junit.jupiter.params.ParameterizedTest;
+import org.junit.jupiter.params.provider.EnumSource;
+
+public class EnumSourceTest {
+
+	@ParameterizedTest
+	@EnumSource(ChronoUnit.class)
+	void checkEnumSourceValue(ChronoUnit unit) {
+		assertNotNull(unit);
+	}
+
+	// ---------------------------------------------------------------------------
+
+	@ParameterizedTest
+	@EnumSource(names = { "DAYS", "HOURS" })
+	void checkEnumSourceNames(ChronoUnit unit) {
+		assertNotNull(unit);
+	}
+}

core-java/junit5-parameterized-tests/src/test/java/source/method/ExternalMethodSource.java

@@ -0,0 +1,11 @@
+package source.method;
+
+import java.util.stream.Stream;
+
+public class ExternalMethodSource {
+
+	static Stream<String> checkExternalMethodSourceArgs() {
+		return Stream.of("a1", "b2");
+	}
+
+}

core-java/junit5-parameterized-tests/src/test/java/source/method/ExternalMethodSourceTest.java

@@ -0,0 +1,17 @@
+package source.method;
+
+import static org.junit.jupiter.api.Assertions.assertTrue;
+
+import org.apache.commons.lang3.StringUtils;
+import org.junit.jupiter.params.ParameterizedTest;
+import org.junit.jupiter.params.provider.MethodSource;
+
+public class ExternalMethodSourceTest {
+
+	// Note: The test will try to load the external method
+	@ParameterizedTest
+	@MethodSource("source.method.ExternalMethodSource#checkExternalMethodSourceArgs")
+	void checkExternalMethodSource(String word) {
+		assertTrue(StringUtils.isAlphanumeric(word), "Supplied word is not alpha-numeric");
+	}
+}

core-java/junit5-parameterized-tests/src/test/java/source/method/MethodSourceTest.java

@@ -0,0 +1,52 @@
+package source.method;
+
+import static org.junit.jupiter.api.Assertions.assertEquals;
+import static org.junit.jupiter.api.Assertions.assertTrue;
+
+import java.util.stream.Stream;
+
+import org.apache.commons.lang3.StringUtils;
+import org.junit.jupiter.params.ParameterizedTest;
+import org.junit.jupiter.params.provider.Arguments;
+import org.junit.jupiter.params.provider.MethodSource;
+
+public class MethodSourceTest {
+
+	// Note: The test will try to load the supplied method
+	@ParameterizedTest
+	@MethodSource("checkExplicitMethodSourceArgs")
+	void checkExplicitMethodSource(String word) {
+		assertTrue(StringUtils.isAlphanumeric(word), "Supplied word is not alpha-numeric");
+	}
+
+	static Stream<String> checkExplicitMethodSourceArgs() {
+		return Stream.of("a1", "b2");
+	}
+
+	// ---------------------------------------------------------------------------
+
+	// Note: The test will search for the source method that matches the test-case
+	// method name
+	@ParameterizedTest
+	@MethodSource
+	void checkImplicitMethodSource(String word) {
+		assertTrue(StringUtils.isAlphanumeric(word), "Supplied word is not alpha-numeric");
+	}
+
+	static Stream<String> checkImplicitMethodSource() {
+		return Stream.of("a1", "b2");
+	}
+
+	// ---------------------------------------------------------------------------
+
+	// Note: The test will automatically map arguments based on the index
+	@ParameterizedTest
+	@MethodSource
+	void checkMultiArgumentsMethodSource(int number, String expected) {
+		assertEquals(StringUtils.equals(expected, "even") ? 0 : 1, number % 2);
+	}
+
+	static Stream<Arguments> checkMultiArgumentsMethodSource() {
+		return Stream.of(Arguments.of(2, "even"), Arguments.of(3, "odd"));
+	}
+}

core-java/junit5-parameterized-tests/src/test/java/source/null_empty/NullEmptySourceTest.java

@@ -0,0 +1,44 @@
+package source.null_empty;
+
+import static org.junit.jupiter.api.Assertions.assertEquals;
+import static org.junit.jupiter.api.Assertions.assertTrue;
+
+import org.junit.jupiter.params.ParameterizedTest;
+import org.junit.jupiter.params.provider.EmptySource;
+import org.junit.jupiter.params.provider.NullAndEmptySource;
+import org.junit.jupiter.params.provider.NullSource;
+import org.junit.jupiter.params.provider.ValueSource;
+
+public class NullEmptySourceTest {
+
+	@ParameterizedTest
+	@NullSource
+	void checkNull(String value) {
+		assertEquals(null, value);
+	}
+
+	// ---------------------------------------------------------------------------
+
+	@ParameterizedTest
+	@EmptySource
+	void checkEmpty(String value) {
+		assertEquals("", value);
+	}
+
+	// ---------------------------------------------------------------------------
+
+	@ParameterizedTest
+	@NullAndEmptySource
+	void checkNullAndEmpty(String value) {
+		assertTrue(value == null || value.isEmpty());
+	}
+
+	// ---------------------------------------------------------------------------
+
+	@ParameterizedTest
+	@NullAndEmptySource
+	@ValueSource(strings = { " ", "   " })
+	void checkNullEmptyAndBlank(String value) {
+		assertTrue(value == null || value.isBlank());
+	}
+}

core-java/junit5-parameterized-tests/src/test/java/source/value/ValueSourceTest.java

@@ -0,0 +1,25 @@
+package source.value;
+
+import static org.junit.jupiter.api.Assertions.assertEquals;
+import static org.junit.jupiter.api.Assertions.assertTrue;
+
+import org.apache.commons.lang3.StringUtils;
+import org.junit.jupiter.params.ParameterizedTest;
+import org.junit.jupiter.params.provider.ValueSource;
+
+public class ValueSourceTest {
+
+	@ParameterizedTest
+	@ValueSource(ints = { 2, 4 })
+	void checkEvenNumber(int number) {
+		assertEquals(0, number % 2, "Supplied number is not an even number");
+	}
+
+	// ---------------------------------------------------------------------------
+
+	@ParameterizedTest
+	@ValueSource(strings = { "a1", "b2" })
+	void checkAlphanumeric(String word) {
+		assertTrue(StringUtils.isAlphanumeric(word), "Supplied word is not alpha-numeric");
+	}
+}

core-java/junit5-parameterized-tests/src/test/resources/csv-file-source.csv

@@ -0,0 +1,3 @@
+NUMBER, ODD_EVEN
+2, even
+3, odd

core-java/junit5-parameterized-tests/src/test/resources/csv-file-source_attributes.csv

@@ -0,0 +1,3 @@
+|| NUMBER | ODD_EVEN ||
+|| 2 	  | even     ||
+|| 3 	  | odd	     ||

junit/junit5/junit5/pom.xml

@@ -0,0 +1,40 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project xmlns="http://maven.apache.org/POM/4.0.0"
+         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
+    <modelVersion>4.0.0</modelVersion>
+
+    <groupId>org.example</groupId>
+    <artifactId>junit5</artifactId>
+    <version>1.0-SNAPSHOT</version>
+
+    <properties>
+        <maven.compiler.source>11</maven.compiler.source>
+        <maven.compiler.target>11</maven.compiler.target>
+    </properties>
+
+    <dependencies>
+        <dependency>
+            <groupId>org.junit.jupiter</groupId>
+            <artifactId>junit-jupiter-api</artifactId>
+            <version>5.9.0</version>
+            <scope>test</scope>
+        </dependency>
+
+        <dependency>
+            <groupId>org.junit.jupiter</groupId>
+            <artifactId>junit-jupiter-params</artifactId>
+            <version>5.9.0</version>
+            <scope>test</scope>
+        </dependency>
+
+        <dependency>
+            <groupId>org.hamcrest</groupId>
+            <artifactId>hamcrest-all</artifactId>
+            <version>1.3</version>
+            <scope>test</scope>
+        </dependency>
+
+    </dependencies>
+
+</project>

junit/junit5/junit5/src/main/java/Cat.java

@@ -0,0 +1,14 @@
+public class Cat {
+    private String name;
+
+    public Cat(String name) {
+        this.name = name;
+    }
+
+    public String getName() {
+        return name;
+    }
+
+    public Cat() {
+    }
+}

junit/junit5/junit5/src/main/java/GoldFish.java

@@ -0,0 +1,24 @@
+
+public class GoldFish {
+    private String name;
+    private int age;
+
+    public GoldFish(String name, int age) {
+        this.name = name;
+        this.age = age;
+    }
+    public int calculateSpeed() {
+        if (age == 0){
+            throw new RuntimeException("This will fail :((");
+        }
+        return 10 / age;
+    }
+
+    public String getName() {
+        return name;
+    }
+
+    public int getAge() {
+        return age;
+    }
+}

junit/junit5/junit5/src/test/java/CatTest.java

@@ -0,0 +1,71 @@
+import org.junit.jupiter.api.Test;
+
+import java.util.List;
+
+import static java.util.Arrays.asList;
+import static org.hamcrest.MatcherAssert.assertThat;
+import static org.hamcrest.Matchers.*;
+
+public class CatTest {
+    @Test
+    public void testMeow() {
+        String catName = "Stilla";
+        int catAge = 3;
+        boolean isNice = false;
+
+        assertThat(catName, equalTo("Stilla"));
+        assertThat(catAge, lessThan(5));
+        assertThat(isNice, is(false));
+    }
+
+    @Test
+    public void testCatInstance() {
+        Cat cat = new Cat();
+
+        assertThat(cat, instanceOf(Cat.class));
+    }
+
+    @Test
+    public void testSameCatInstance() {
+        Cat cat = new Cat();
+
+        assertThat(cat, sameInstance(cat));
+    }
+
+    @Test
+    public void testCollectionContaining() {
+        List<String> catNames = asList("Phibi", "Monica", "Stilla");
+
+        assertThat(catNames, hasItems("Monica", "Phibi"));
+        assertThat(catNames, not(hasItems("Melih")));
+    }
+
+    @Test
+    public void testCollectionSize() {
+        List<String> catNames = asList("Phibi", "Monica");
+
+        assertThat(catNames, hasSize(2));
+    }
+
+    @Test
+    public void testBean() {
+        Cat cat = new Cat("Mimi");
+
+        assertThat(cat, hasProperty("name", equalTo("Mimi")));
+    }
+
+    @Test
+    public void testStringEquality() {
+        String catNameInCaps = "RACHEL";
+
+        assertThat(catNameInCaps, equalToIgnoringCase("rachel"));
+    }
+
+    @Test
+    public void testStringContains() {
+        String catName = "Joey The Cute";
+
+        assertThat(catName, containsString("Cute"));
+    }
+
+}

junit/junit5/junit5/src/test/java/DogTest.java

@@ -0,0 +1,82 @@
+import org.junit.jupiter.api.*;
+
+import static org.junit.jupiter.api.Assertions.*;
+
+public class DogTest {
+
+    @BeforeAll
+    public static void init() {
+        System.out.println("Doing stuff");
+    }
+
+    @BeforeEach
+    public void doEach() {
+        System.out.println("Hey Doggo");
+    }
+
+    @AfterAll
+    public static void finish() {
+        System.out.println("Finishing stuff");
+    }
+
+    @AfterEach
+    public void doAfterEach() {
+        System.out.println("Bye Doggo");
+    }
+
+    @Test
+    public void barkFailure() {
+        String expectedString = "Meow";
+        assertEquals(expectedString, "Woof");
+    }
+
+    @Disabled("Dog 1 please don't woof")
+    @Test
+    public void testBark1() {
+        String expectedString = "woof1";
+        assertEquals(expectedString, "woof1");
+        System.out.println("WOOF => 1");
+    }
+
+    @Test
+    public void testBark2() {
+        String expectedString = "woof2";
+        assertEquals(expectedString, "woof2");
+        System.out.println("WOOF => 2");
+    }
+
+    @Test
+    public void testNotBark() {
+        String unexpectedString = "";
+        assertNotEquals(unexpectedString, "woof");
+        System.out.println("Didn't woof!!");
+    }
+
+    @Test
+    public void nullCheck() {
+        Object dog = null;
+        assertNull(dog);
+        System.out.println("Null dog :(");
+    }
+
+    @Test
+    public void nonNullCheck() {
+        String dog = "Max";
+        assertNotNull(dog);
+        System.out.println("Hey I am " + dog);
+    }
+
+    @Test
+    public void trueCheck() {
+        int dogAge = 2;
+        assertTrue(dogAge < 5);
+        System.out.println("I am young :)");
+    }
+
+    @Test
+    public void falseCheck() {
+        int dogAge = 7;
+        assertFalse(dogAge < 5);
+        System.out.println("I am old :(");
+    }
+}

junit/junit5/junit5/src/test/java/GoldFishTest.java

@@ -0,0 +1,51 @@
+import org.junit.jupiter.api.Test;
+import org.junit.jupiter.params.ParameterizedTest;
+import org.junit.jupiter.params.provider.Arguments;
+import org.junit.jupiter.params.provider.MethodSource;
+import java.util.stream.Stream;
+
+import static org.hamcrest.MatcherAssert.assertThat;
+import static org.hamcrest.Matchers.equalToIgnoringCase;
+import static org.junit.jupiter.api.Assertions.assertThrows;
+import static org.junit.jupiter.api.Assertions.assertTrue;
+import static org.junit.jupiter.api.Assumptions.assumeTrue;
+
+public class GoldFishTest {
+    @Test
+    public void testBooleanAssumption() {
+        GoldFish goldFish = new GoldFish("Windows Jelly", 1);
+
+        assumeTrue(System.getProperty("os.name").contains("Windows"));
+        assertThat(goldFish.getName(), equalToIgnoringCase("Windows Jelly"));
+    }
+
+    @Test
+    public void testBooleanAssert() {
+        GoldFish goldFish = new GoldFish("Windows Jelly", 1);
+
+        assert(System.getProperty("os.name").contains("Windows"));
+        assertThat(goldFish.getName(), equalToIgnoringCase("Windows Jelly"));
+    }
+
+    @Test
+    public void testException() {
+        GoldFish goldFish = new GoldFish("Goldy", 0);
+
+        RuntimeException exception = assertThrows(RuntimeException.class, goldFish::calculateSpeed);
+
+        assertThat(exception.getMessage(), equalToIgnoringCase("This will fail :(("));
+    }
+
+    @ParameterizedTest
+    @MethodSource("provideFishes")
+    public void parameterizedTest(GoldFish goldFish) {
+        assertTrue(goldFish.getAge() >= 1);
+    }
+
+    private static Stream<Arguments> provideFishes() {
+        return Stream.of(
+                Arguments.of(new GoldFish("Browny", 1)),
+                Arguments.of(new GoldFish("Greeny", 2))
+        );
+    }
+}

nodejs/graphql/student-register/README.md

@@ -0,0 +1 @@
+### NBuild Awesome CRUD APIs Using Apollo Server(Graphql), MongoDB and Node.Js Code Example

nodejs/graphql/student-register/index.js

@@ -0,0 +1,28 @@
+const { ApolloServer } = require("@apollo/server");
+const { startStandaloneServer } = require("@apollo/server/standalone");
+const mongoose = require("mongoose");
+const { resolvers } = require("./resolvers.js");
+const { typeDefs } = require("./models/typeDefs.js");
+
+const MONGO_URI = "mongodb://localhost:27017/student-register";
+
+// Database connection
+mongoose
+  .connect(MONGO_URI, {
+    useNewUrlParser: true,
+    useUnifiedTopology: true,
+  })
+  .then(() => {
+    console.log(`Db Connected`);
+  })
+  .catch(err => {
+    console.log(err.message);
+  });
+
+const server = new ApolloServer({ typeDefs, resolvers });
+
+startStandaloneServer(server, {
+  listen: { port: 4000 },
+}).then(({ url }) => {
+  console.log(`Server ready at ${url}`);
+});

nodejs/graphql/student-register/models/Student.js

@@ -0,0 +1,9 @@
+const mongoose = require("mongoose");
+
+const Student = mongoose.model("Student", {
+  firstName: String,
+  lastName: String,
+  age: Number,
+});
+
+module.exports = { Student };

nodejs/graphql/student-register/models/typeDefs.js

@@ -0,0 +1,23 @@
+const gql = require("graphql-tag");
+
+const typeDefs = gql`
+  type Query {
+    hello: String
+    welcome(name: String): String
+    students: [Student] #return array of students
+    student(id: ID): Student #return student by id
+  }
+  type Student {
+    id: ID
+    firstName: String
+    lastName: String
+    age: Int
+  }
+  type Mutation {
+    create(firstName: String, lastName: String, age: Int): Student
+    update(id: ID, firstName: String, lastName: String, age: Int): Student
+    delete(id: ID): Student
+  }
+`;
+
+module.exports = { typeDefs };

nodejs/graphql/student-register/package.json

@@ -0,0 +1,20 @@
+{
+  "name": "graphql",
+  "version": "1.0.0",
+  "description": "",
+  "main": "index.js",
+  "scripts": {
+    "test": "echo \"Error: no test specified\" && exit 1",
+    "start": "node index.js",
+    "dev": "nodemon index.js"
+  },
+  "keywords": [],
+  "author": "",
+  "license": "ISC",
+  "dependencies": {
+    "@apollo/server": "^4.4.1",
+    "graphql": "^16.6.0",
+    "graphql-tag": "^2.12.6",
+    "mongoose": "^7.0.1"
+  }
+}

nodejs/graphql/student-register/resolvers.js

@@ -0,0 +1,41 @@
+const { Student } = require("./models/Student.js");
+
+// GraphQL Resolvers
+const resolvers = {
+  Query: {
+    hello: () => "Hello from Reflectoring Blog",
+    welcome: (parent, args) => `Hello ${args.name}`,
+    students: async () => await Student.find({}), // return array of students
+    student: async (parent, args) => await Student.findById(args.id), // return student by id
+  },
+  Mutation: {
+    create: async (parent, args) => {
+      const { firstName, lastName, age } = args;
+      const newStudent = new Student({
+        firstName,
+        lastName,
+        age,
+      });
+      await newStudent.save();
+      return newStudent;
+    },
+    update: async (parent, args) => {
+      const { id } = args;
+      const updatedStudent = await Student.findByIdAndUpdate(id, args);
+      if (!updatedStudent) {
+        throw new Error(`Student with ID ${id} not found`);
+      }
+      return updatedStudent;
+    },
+    delete: async (parent, args) => {
+      const { id } = args;
+      const deletedStudent = await Student.findByIdAndDelete(id);
+      if (!deletedStudent) {
+        throw new Error(`Student with ID ${id} not found`);
+      }
+      return deletedStudent;
+    },
+  },
+};
+
+module.exports = { resolvers };

nodejs/node-csv-importer/client/.gitignore

@@ -0,0 +1,23 @@
+# See https://help.github.com/articles/ignoring-files/ for more about ignoring files.
+
+# dependencies
+/node_modules
+/.pnp
+.pnp.js
+
+# testing
+/coverage
+
+# production
+/build
+
+# misc
+.DS_Store
+.env.local
+.env.development.local
+.env.test.local
+.env.production.local
+
+npm-debug.log*
+yarn-debug.log*
+yarn-error.log*

nodejs/node-csv-importer/client/README.md

@@ -0,0 +1,70 @@
+# Getting Started with Create React App
+
+This project was bootstrapped with [Create React App](https://github.com/facebook/create-react-app).
+
+## Available Scripts
+
+In the project directory, you can run:
+
+### `npm start`
+
+Runs the app in the development mode.\
+Open [http://localhost:3000](http://localhost:3000) to view it in your browser.
+
+The page will reload when you make changes.\
+You may also see any lint errors in the console.
+
+### `npm test`
+
+Launches the test runner in the interactive watch mode.\
+See the section about [running tests](https://facebook.github.io/create-react-app/docs/running-tests) for more information.
+
+### `npm run build`
+
+Builds the app for production to the `build` folder.\
+It correctly bundles React in production mode and optimizes the build for the best performance.
+
+The build is minified and the filenames include the hashes.\
+Your app is ready to be deployed!
+
+See the section about [deployment](https://facebook.github.io/create-react-app/docs/deployment) for more information.
+
+### `npm run eject`
+
+**Note: this is a one-way operation. Once you `eject`, you can't go back!**
+
+If you aren't satisfied with the build tool and configuration choices, you can `eject` at any time. This command will remove the single build dependency from your project.
+
+Instead, it will copy all the configuration files and the transitive dependencies (webpack, Babel, ESLint, etc) right into your project so you have full control over them. All of the commands except `eject` will still work, but they will point to the copied scripts so you can tweak them. At this point you're on your own.
+
+You don't have to ever use `eject`. The curated feature set is suitable for small and middle deployments, and you shouldn't feel obligated to use this feature. However we understand that this tool wouldn't be useful if you couldn't customize it when you are ready for it.
+
+## Learn More
+
+You can learn more in the [Create React App documentation](https://facebook.github.io/create-react-app/docs/getting-started).
+
+To learn React, check out the [React documentation](https://reactjs.org/).
+
+### Code Splitting
+
+This section has moved here: [https://facebook.github.io/create-react-app/docs/code-splitting](https://facebook.github.io/create-react-app/docs/code-splitting)
+
+### Analyzing the Bundle Size
+
+This section has moved here: [https://facebook.github.io/create-react-app/docs/analyzing-the-bundle-size](https://facebook.github.io/create-react-app/docs/analyzing-the-bundle-size)
+
+### Making a Progressive Web App
+
+This section has moved here: [https://facebook.github.io/create-react-app/docs/making-a-progressive-web-app](https://facebook.github.io/create-react-app/docs/making-a-progressive-web-app)
+
+### Advanced Configuration
+
+This section has moved here: [https://facebook.github.io/create-react-app/docs/advanced-configuration](https://facebook.github.io/create-react-app/docs/advanced-configuration)
+
+### Deployment
+
+This section has moved here: [https://facebook.github.io/create-react-app/docs/deployment](https://facebook.github.io/create-react-app/docs/deployment)
+
+### `npm run build` fails to minify
+
+This section has moved here: [https://facebook.github.io/create-react-app/docs/troubleshooting#npm-run-build-fails-to-minify](https://facebook.github.io/create-react-app/docs/troubleshooting#npm-run-build-fails-to-minify)

nodejs/node-csv-importer/client/package.json

@@ -0,0 +1,40 @@
+{
+  "name": "client",
+  "version": "0.1.0",
+  "private": true,
+  "dependencies": {
+    "@testing-library/jest-dom": "^5.16.5",
+    "@testing-library/react": "^13.4.0",
+    "@testing-library/user-event": "^13.5.0",
+    "axios": "^1.1.3",
+    "react": "^18.2.0",
+    "react-dom": "^18.2.0",
+    "react-scripts": "5.0.1",
+    "react-table": "^7.8.0",
+    "web-vitals": "^2.1.4"
+  },
+  "scripts": {
+    "start": "react-scripts start",
+    "build": "react-scripts build",
+    "test": "react-scripts test",
+    "eject": "react-scripts eject"
+  },
+  "eslintConfig": {
+    "extends": [
+      "react-app",
+      "react-app/jest"
+    ]
+  },
+  "browserslist": {
+    "production": [
+      ">0.2%",
+      "not dead",
+      "not op_mini all"
+    ],
+    "development": [
+      "last 1 chrome version",
+      "last 1 firefox version",
+      "last 1 safari version"
+    ]
+  }
+}

nodejs/node-csv-importer/client/public/index.html

@@ -0,0 +1,43 @@
+<!DOCTYPE html>
+<html lang="en">
+  <head>
+    <meta charset="utf-8" />
+    <link rel="icon" href="%PUBLIC_URL%/favicon.ico" />
+    <meta name="viewport" content="width=device-width, initial-scale=1" />
+    <meta name="theme-color" content="#000000" />
+    <meta
+      name="description"
+      content="Web site created using create-react-app"
+    />
+    <link rel="apple-touch-icon" href="%PUBLIC_URL%/logo192.png" />
+    <!--
+      manifest.json provides metadata used when your web app is installed on a
+      user's mobile device or desktop. See https://developers.google.com/web/fundamentals/web-app-manifest/
+    -->
+    <link rel="manifest" href="%PUBLIC_URL%/manifest.json" />
+    <!--
+      Notice the use of %PUBLIC_URL% in the tags above.
+      It will be replaced with the URL of the `public` folder during the build.
+      Only files inside the `public` folder can be referenced from the HTML.
+
+      Unlike "/favicon.ico" or "favicon.ico", "%PUBLIC_URL%/favicon.ico" will
+      work correctly both with client-side routing and a non-root public URL.
+      Learn how to configure a non-root public URL by running `npm run build`.
+    -->
+    <title>React App</title>
+  </head>
+  <body>
+    <noscript>You need to enable JavaScript to run this app.</noscript>
+    <div id="root"></div>
+    <!--
+      This HTML file is a template.
+      If you open it directly in the browser, you will see an empty page.
+
+      You can add webfonts, meta tags, or analytics to this file.
+      The build step will place the bundled scripts into the <body> tag.
+
+      To begin the development, run `npm start` or `yarn start`.
+      To create a production bundle, use `npm run build` or `yarn build`.
+    -->
+  </body>
+</html>

nodejs/node-csv-importer/client/public/manifest.json

@@ -0,0 +1,25 @@
+{
+  "short_name": "React App",
+  "name": "Create React App Sample",
+  "icons": [
+    {
+      "src": "favicon.ico",
+      "sizes": "64x64 32x32 24x24 16x16",
+      "type": "image/x-icon"
+    },
+    {
+      "src": "logo192.png",
+      "type": "image/png",
+      "sizes": "192x192"
+    },
+    {
+      "src": "logo512.png",
+      "type": "image/png",
+      "sizes": "512x512"
+    }
+  ],
+  "start_url": ".",
+  "display": "standalone",
+  "theme_color": "#000000",
+  "background_color": "#ffffff"
+}

nodejs/node-csv-importer/client/public/robots.txt

@@ -0,0 +1,3 @@
+# https://www.robotstxt.org/robotstxt.html
+User-agent: *
+Disallow:

nodejs/node-csv-importer/client/src/App.css

@@ -0,0 +1,63 @@
+table {
+  border-spacing: 0;
+  border: 1px solid #ededed;
+}
+table tr:last-child td {
+  border-bottom: 0;
+}
+table th,
+table td {
+  margin: 0;
+  padding: 0.5rem;
+  border-bottom: 1px solid #ededed;
+  border-right: 1px solid #ededed;
+  position: relative;
+}
+table th:last-child,
+table td:last-child {
+  border-right: 0;
+}
+table tr:nth-child(even) {
+  background-color: #fafafa;
+}
+
+table th::before {
+  position: absolute;
+  right: 15px;
+  top: 16px;
+  content: "";
+  width: 0;
+  height: 0;
+  border-left: 5px solid transparent;
+  border-right: 5px solid transparent;
+}
+table th.sort-asc::before {
+  border-bottom: 5px solid #22543d;
+}
+table th.sort-desc::before {
+  border-top: 5px solid #22543d;
+}
+
+.App {
+  display: flex;
+  flex-direction: column;
+  padding: 20px;
+}
+.badge {
+  background-color: #9ae6b4;
+  color: #22543d;
+  margin-right: 4px;
+  padding: 4px 8px;
+  border-radius: 12px;
+  font-size: 12px;
+  font-weight: bold;
+  text-transform: uppercase;
+}
+input {
+  padding: 10px;
+  margin-bottom: 20px;
+  font-size: 18px;
+  border-radius: 5px;
+  border: 1px solid #ddd;
+  box-shadow: none;
+}

nodejs/node-csv-importer/client/src/App.js

@@ -0,0 +1,185 @@
+import React, { useMemo, useState, useEffect } from "react";
+import axios from "axios";
+import Table from "./Table";
+import './App.css';
+
+const Children = ({ values }) => {
+  return (
+    <>
+      {values.map((child, idx) => {
+        return (
+          <div className="image">
+            <img
+              src={child.avatar}
+              alt="Profile"
+            />
+            </div>
+        );
+      })}
+    </>
+  );
+};
+
+const Avatar = ({ value }) => {
+  return (
+    <div className="image">
+      <img
+        src={value}
+        alt="Profile"
+      />
+      </div>
+  );
+};
+
+const uploadToServer = (file, onUploadProgress) => {
+  let formData = new FormData();
+
+  formData.append("file", file);
+
+  return axios.post('http://localhost:8080/api/csv/upload', formData, {
+    headers: {
+      "Content-Type": "multipart/form-data",
+    },
+    onUploadProgress,
+  });
+};
+
+function App() {
+
+  const [data, setData] = useState([]);
+  const [selectedFiles, setSelectedFiles] = useState(undefined);
+  const [currentFile, setCurrentFile] = useState(undefined);
+  const [progress, setProgress] = useState(0);
+  const [message, setMessage] = useState("");
+
+  const columns = useMemo(
+    () => [
+      {
+        Header: "Employee Details",
+        columns: [
+          {
+            Header: "Avatar",
+            accessor: "avatar",
+            Cell: ({ cell: { value } }) => <Avatar value={value} />
+          },
+          {
+            Header: "Name",
+            accessor: "name"
+          },
+          {
+            Header: "Email",
+            accessor: "email"
+          },
+          {
+            Header: "Username",
+            accessor: "username"
+          },
+          {
+            Header: "DOB",
+            accessor: "dob"
+          },
+          {
+            Header: "Company",
+            accessor: "company"
+          },
+          {
+            Header: "Address",
+            accessor: "address"
+          },
+          {
+            Header: "Location",
+            accessor: "location"
+          },
+          {
+            Header: "Salary",
+            accessor: "salary"
+          },
+          {
+            Header: "Role",
+            accessor: "role"
+          },
+          {
+            Header: "Direct Reportee",
+            accessor: "children",
+            Cell: ({ cell: { value } }) => <Children values={value} />
+          }
+        ]
+      }
+    ],
+    []
+  );
+
+  useEffect(() => {
+    (async () => {
+      const result = await axios("http://localhost:8080/api/employees");
+      setData(result.data);
+    })();
+  }, []);
+
+  const selectFile = (event) => {
+    setSelectedFiles(event.target.files);
+  };
+
+  const upload = () => {
+    let currentFile = selectedFiles[0];
+
+    setProgress(0);
+    setCurrentFile(currentFile);
+
+    uploadToServer(currentFile, (event) => {
+      setProgress(Math.round((100 * event.loaded) / event.total));
+    })
+      .then(async (response) => {
+        setMessage(response.data.message);
+        const result = await axios("http://localhost:8080/api/employees");
+        setData(result.data);
+      })
+      .catch(() => {
+        setProgress(0);
+        setMessage("Could not upload the file!");
+        setCurrentFile(undefined);
+      });
+
+    setSelectedFiles(undefined);
+  };
+
+  return (
+    <div className="App">
+      <div>
+      {currentFile && (
+        <div className="progress">
+          <div
+            className="progress-bar progress-bar-info progress-bar-striped"
+            role="progressbar"
+            aria-valuenow={progress}
+            aria-valuemin="0"
+            aria-valuemax="100"
+            style={{ width: progress + "%" }}
+          >
+            {progress}%
+          </div>
+        </div>
+      )}
+
+      <label className="btn btn-default">
+        <input type="file" onChange={selectFile} />
+      </label>
+
+      <button
+        className="btn btn-success"
+        disabled={!selectedFiles}
+        onClick={upload}
+      >
+        Upload
+      </button>
+
+      <div className="alert alert-light" role="alert">
+        {message}
+      </div>
+    </div>
+      <Table columns={columns} data={data} />
+    </div>
+  );
+}
+
+export default App;

nodejs/node-csv-importer/client/src/App.test.js

@@ -0,0 +1,8 @@
+import { render, screen } from '@testing-library/react';
+import App from './App';
+
+test('renders learn react link', () => {
+  render(<App />);
+  const linkElement = screen.getByText(/learn react/i);
+  expect(linkElement).toBeInTheDocument();
+});

nodejs/node-csv-importer/client/src/Table.js

@@ -0,0 +1,75 @@
+import React, { useState } from "react";
+import { useTable, useFilters, useSortBy } from "react-table";
+
+export default function Table({ columns, data }) {
+  const [filterInput, setFilterInput] = useState("");
+  // Use the state and functions returned from useTable to build your UI
+  const {
+    getTableProps,
+    getTableBodyProps,
+    headerGroups,
+    rows,
+    prepareRow,
+    setFilter
+  } = useTable(
+    {
+      columns,
+      data
+    },
+    useFilters,
+    useSortBy
+  );
+
+  const handleFilterChange = e => {
+    const value = e.target.value || undefined;
+    setFilter("name", value);
+    setFilterInput(value);
+  };
+
+  // Render the UI for your table
+  return (
+    <>
+      <input
+        value={filterInput}
+        onChange={handleFilterChange}
+        placeholder={"Search name"}
+      />
+      <table {...getTableProps()}>
+        <thead>
+          {headerGroups.map(headerGroup => (
+            <tr {...headerGroup.getHeaderGroupProps()}>
+              {headerGroup.headers.map(column => (
+                <th
+                  {...column.getHeaderProps(column.getSortByToggleProps())}
+                  className={
+                    column.isSorted
+                      ? column.isSortedDesc
+                        ? "sort-desc"
+                        : "sort-asc"
+                      : ""
+                  }
+                >
+                  {column.render("Header")}
+                </th>
+              ))}
+            </tr>
+          ))}
+        </thead>
+        <tbody {...getTableBodyProps()}>
+          {rows.map((row, i) => {
+            prepareRow(row);
+            return (
+              <tr {...row.getRowProps()}>
+                {row.cells.map(cell => {
+                  return (
+                    <td {...cell.getCellProps()}>{cell.render("Cell")}</td>
+                  );
+                })}
+              </tr>
+            );
+          })}
+        </tbody>
+      </table>
+    </>
+  );
+}

nodejs/node-csv-importer/client/src/index.css

@@ -0,0 +1,13 @@
+body {
+  margin: 0;
+  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Roboto', 'Oxygen',
+    'Ubuntu', 'Cantarell', 'Fira Sans', 'Droid Sans', 'Helvetica Neue',
+    sans-serif;
+  -webkit-font-smoothing: antialiased;
+  -moz-osx-font-smoothing: grayscale;
+}
+
+code {
+  font-family: source-code-pro, Menlo, Monaco, Consolas, 'Courier New',
+    monospace;
+}

nodejs/node-csv-importer/client/src/index.js

@@ -0,0 +1,17 @@
+import React from 'react';
+import ReactDOM from 'react-dom/client';
+import './index.css';
+import App from './App';
+import reportWebVitals from './reportWebVitals';
+
+const root = ReactDOM.createRoot(document.getElementById('root'));
+root.render(
+  <React.StrictMode>
+    <App />
+  </React.StrictMode>
+);
+
+// If you want to start measuring performance in your app, pass a function
+// to log results (for example: reportWebVitals(console.log))
+// or send to an analytics endpoint. Learn more: https://bit.ly/CRA-vitals
+reportWebVitals();

nodejs/node-csv-importer/client/src/logo.svg

@@ -0,0 +1 @@
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nodejs/node-csv-importer/client/src/reportWebVitals.js

@@ -0,0 +1,13 @@
+const reportWebVitals = onPerfEntry => {
+  if (onPerfEntry && onPerfEntry instanceof Function) {
+    import('web-vitals').then(({ getCLS, getFID, getFCP, getLCP, getTTFB }) => {
+      getCLS(onPerfEntry);
+      getFID(onPerfEntry);
+      getFCP(onPerfEntry);
+      getLCP(onPerfEntry);
+      getTTFB(onPerfEntry);
+    });
+  }
+};
+
+export default reportWebVitals;

nodejs/node-csv-importer/client/src/setupTests.js

@@ -0,0 +1,5 @@
+// jest-dom adds custom jest matchers for asserting on DOM nodes.
+// allows you to do things like:
+// expect(element).toHaveTextContent(/react/i)
+// learn more: https://github.com/testing-library/jest-dom
+import '@testing-library/jest-dom';

nodejs/node-csv-importer/package.json

@@ -0,0 +1,32 @@
+{
+  "name": "node-csv-importer",
+  "version": "1.0.0",
+  "description": "This code shows how we can build a CSV importer with frameworks and libraries common in the Node.js tech stack.",
+  "main": "server/index.js",
+  "scripts": {
+    "test": "echo \"Error: no test specified\" && exit 1",
+    "start": "node server/index.js",
+    "build": "cd client && npm install && npm run build"
+  },
+  "type": "module",
+  "keywords": [
+    "node",
+    "csv",
+    "express",
+    "multer",
+    "fast-csv",
+    "postgresql",
+    "sequelize"
+  ],
+  "author": "arpendu",
+  "license": "ISC",
+  "dependencies": {
+    "cors": "^2.8.5",
+    "express": "^4.18.2",
+    "fast-csv": "^4.3.6",
+    "json2csv": "^5.0.7",
+    "multer": "^1.4.5-lts.1",
+    "pg": "^8.8.0",
+    "sequelize": "^6.25.5"
+  }
+}

nodejs/node-csv-importer/server/config/db.config.js

@@ -0,0 +1,20 @@
+const HOST = "10.204.133.84";
+const USER = "postgres";
+const PASSWORD = "Welcome123";
+const DB = "csvdb";
+const dialect = "postgres";
+const pool = {
+    max: 5,
+    min: 0,
+    acquire: 30000,
+    idle: 10000
+};
+
+export default {
+    HOST,
+    USER,
+    PASSWORD,
+    DB,
+    dialect,
+    pool
+};

nodejs/node-csv-importer/server/controllers/csv.controller.js

@@ -0,0 +1,79 @@
+import Employee from '../models/employee.model.js';
+import { createReadStream } from 'fs';
+import { parse } from 'fast-csv';
+import { Parser as CsvParser } from 'json2csv';
+
+const upload = async (req, res) => {
+  try {
+    if (req.file == undefined) {
+      return res.status(400).send("Please upload a CSV file!");
+    }
+
+    let employees = [];
+    let path = "./resources/static/assets/uploads/" + req.file.filename;
+
+    createReadStream(path)
+      .pipe(parse({ headers: true }))
+      .on("error", (error) => {
+        throw error.message;
+      })
+      .on("data", (row) => {
+        employees.push(row);
+      })
+      .on("end", () => {
+        Employee.bulkCreate(employees)
+          .then(() => {
+            res.status(200).send({
+              message: "The file: "
+               + req.file.originalname
+               + " got uploaded successfully!!",
+            });
+          })
+          .catch((error) => {
+            res.status(500).send({
+              message: "Couldn't import data into database!",
+              error: error.message,
+            });
+          });
+      });
+  } catch (error) {
+    console.log(error);
+    res.status(500).send({
+      message: "Failed to upload the file: " + req.file.originalname,
+    });
+  }
+};
+
+const download = (_req, res) => {
+  Employee.findAll().then((objs) => {
+    let employees = [];
+
+    objs.forEach((obj) => {
+      const { id, name, email,
+        username, dob, company,
+        address, location, salary,
+        about, role } = obj;
+      employees.push({ id, name, email,
+        username, dob, company,
+        address, location, salary,
+        about, role });
+    });
+
+    const csvFields = ['id', 'name', 'email',
+                     'username', 'dob', 'company',
+                     'address', 'location', 'salary',
+                     'about', 'role'];
+    const csvParser = new CsvParser({ csvFields });
+    const csvData = csvParser.parse(employees);
+
+    res.setHeader('Content-Type', 'text/csv');
+    res.setHeader('Content-Disposition', 'attachment; filename=employees.csv');
+
+    res.status(200).end(csvData);
+  });
+};
+
+export default {
+  upload,
+  download,
+};

nodejs/node-csv-importer/server/controllers/employee.controller.js

@@ -0,0 +1,27 @@
+import Employee from '../models/employee.model.js';
+
+const getEmployees = (_req, res) => {
+    Employee.findAll({
+        include: [{
+            model: Employee,
+            as: 'children',
+            attributes: ['id', 'name', 'email', 'username', 'avatar'],
+            required: true
+        }],
+        attributes: {
+            exclude: ['managedBy']
+        }
+    })
+      .then((data) => {
+        res.send(data);
+      })
+      .catch((err) => {
+        res.status(500).send({
+          message:
+            err.message
+             || "There might be some error occurred while retrieving employees from database.",
+        });
+      });
+  };
+
+export default getEmployees;

nodejs/node-csv-importer/server/database/index.js

@@ -0,0 +1,25 @@
+import Sequelize from 'sequelize';
+import dbConfig from '../config/db.config.js';
+
+export const sequelize =  new Sequelize(dbConfig.DB, dbConfig.USER, dbConfig.PASSWORD, {
+    host: dbConfig.HOST,
+    dialect: dbConfig.dialect,
+    pool: dbConfig.pool,
+    logging: console.log
+  }
+);
+
+sequelize.authenticate()
+  .then(() => {
+    console.log('Connection has been established successfully.');
+    console.log('Creating tables ===================');
+    sequelize.sync().then(() => {
+        console.log('=============== Tables created per model');
+    })
+    .catch(err => {
+        console.error('Unable to create tables:', err);    
+    })
+  })
+  .catch(err => {
+    console.error('Unable to connect to the database:', err);
+});

nodejs/node-csv-importer/server/index.js

@@ -0,0 +1,28 @@
+import express from 'express';
+import path from 'path';
+import cors from 'cors';
+import initRoutes from './routes/index.js';
+
+global.__basedir = path.resolve() + "/..";
+
+const app = express();
+
+var corsOptions = {
+  origin: "http://localhost:3000"
+};
+
+app.use(cors(corsOptions));
+
+// parse requests of content-type - application/json
+app.use(express.json());
+
+// parse requests of content-type - application/x-www-form-urlencoded
+app.use(express.urlencoded({ extended: true }));
+
+initRoutes(app);
+
+// set port, listen for requests
+const PORT = process.env.PORT || 8080;
+app.listen(PORT, () => {
+  console.log(`Server is running on port ${PORT}.`);
+});

nodejs/node-csv-importer/server/middleware/upload.js

@@ -0,0 +1,33 @@
+import fs from 'fs';
+import multer from 'multer';
+
+const storage = multer.diskStorage({
+  destination: (_req, file, cb) => {
+    console.log(file.originalname);
+    const dir = './resources/static/assets/uploads';
+    if (!fs.existsSync(dir)) {
+        fs.mkdirSync(dir, { recursive: true });
+    }
+    cb(null, dir);
+  },
+  filename: (_req, file, cb) => {
+    console.log(file.originalname);
+    cb(null, `${Date.now()}-${file.originalname}`);
+  },
+});
+
+const csvFilter = (_req, file, cb) => {
+  console.log('Reading file in middleware', file.originalname);
+  if (file == undefined) {
+    cb('Please upload a file to proceed.', false);
+  } else if (file.mimetype.includes('csv')) {
+    cb(null, true);
+  } else {
+    cb('Please upload only csv file as only CSV is supported for now.', false);
+  }
+};
+
+export default multer({
+    storage: storage,
+    fileFilter: csvFilter
+});

nodejs/node-csv-importer/server/models/employee.model.js

@@ -0,0 +1,68 @@
+import Sequelize from 'sequelize';
+import { sequelize } from '../database/index.js';
+
+const Employee = sequelize.define("employee", {
+    id: {
+      type: Sequelize.STRING,
+      primaryKey: true
+    },
+    name: {
+      type: Sequelize.STRING
+    },
+    email: {
+      type: Sequelize.STRING
+    },
+    username: {
+      type: Sequelize.STRING
+    },
+    dob: {
+      type: Sequelize.STRING
+    },
+    company: {
+      type: Sequelize.STRING
+    },
+    address: {
+      type: Sequelize.STRING
+    },
+    location: {
+      type: Sequelize.STRING
+    },
+    salary: {
+      type: Sequelize.STRING
+    },
+    about: {
+      type: Sequelize.STRING
+    },
+    role: {
+      type: Sequelize.STRING
+    },
+    managedBy: {
+      type: Sequelize.STRING,
+      references: {
+          model: 'employees',
+          key: 'id'
+      }
+    },
+    createdAt: {
+      type: Sequelize.STRING
+    },
+    updatedAt: {
+      type: Sequelize.STRING
+    },
+    avatar: {
+      type: Sequelize.STRING
+    }
+  });
+
+Employee.hasMany(Employee, {
+    as: 'children',
+    foreignKey: 'managedBy',
+    sourceKey: 'id',
+    useJunctionTable: false
+  });
+Employee.belongsTo(Employee, {
+    foreignKey: "managedBy",
+    targetKey: "id",
+  });
+
+export default Employee;

nodejs/node-csv-importer/server/routes/index.js

@@ -0,0 +1,19 @@
+import { Router } from 'express';
+import csvController from '../controllers/csv.controller.js';
+import getEmployees from '../controllers/employee.controller.js';
+import uploadFile from '../middleware/upload.js';
+
+const router = Router();
+
+let routes = (app) => {
+  // CSV
+  router.post('/csv/upload', uploadFile.single('file'), csvController.upload);
+  router.get('/csv/download', csvController.download);
+
+  // Employees
+  router.get('/employees', getEmployees);
+
+  app.use("/api", router);
+};
+
+export default routes;

spring-boot/ioc-and-di/mvnw

@@ -0,0 +1,316 @@
+#!/bin/sh
+# ----------------------------------------------------------------------------
+# Licensed to the Apache Software Foundation (ASF) under one
+# or more contributor license agreements.  See the NOTICE file
+# distributed with this work for additional information
+# regarding copyright ownership.  The ASF licenses this file
+# to you under the Apache License, Version 2.0 (the
+# "License"); you may not use this file except in compliance
+# with the License.  You may obtain a copy of the License at
+#
+#    https://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing,
+# software distributed under the License is distributed on an
+# "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+# KIND, either express or implied.  See the License for the
+# specific language governing permissions and limitations
+# under the License.
+# ----------------------------------------------------------------------------
+
+# ----------------------------------------------------------------------------
+# Maven Start Up Batch script
+#
+# Required ENV vars:
+# ------------------
+#   JAVA_HOME - location of a JDK home dir
+#
+# Optional ENV vars
+# -----------------
+#   M2_HOME - location of maven2's installed home dir
+#   MAVEN_OPTS - parameters passed to the Java VM when running Maven
+#     e.g. to debug Maven itself, use
+#       set MAVEN_OPTS=-Xdebug -Xrunjdwp:transport=dt_socket,server=y,suspend=y,address=8000
+#   MAVEN_SKIP_RC - flag to disable loading of mavenrc files
+# ----------------------------------------------------------------------------
+
+if [ -z "$MAVEN_SKIP_RC" ] ; then
+
+  if [ -f /usr/local/etc/mavenrc ] ; then
+    . /usr/local/etc/mavenrc
+  fi
+
+  if [ -f /etc/mavenrc ] ; then
+    . /etc/mavenrc
+  fi
+
+  if [ -f "$HOME/.mavenrc" ] ; then
+    . "$HOME/.mavenrc"
+  fi
+
+fi
+
+# OS specific support.  $var _must_ be set to either true or false.
+cygwin=false;
+darwin=false;
+mingw=false
+case "`uname`" in
+  CYGWIN*) cygwin=true ;;
+  MINGW*) mingw=true;;
+  Darwin*) darwin=true
+    # Use /usr/libexec/java_home if available, otherwise fall back to /Library/Java/Home
+    # See https://developer.apple.com/library/mac/qa/qa1170/_index.html
+    if [ -z "$JAVA_HOME" ]; then
+      if [ -x "/usr/libexec/java_home" ]; then
+        export JAVA_HOME="`/usr/libexec/java_home`"
+      else
+        export JAVA_HOME="/Library/Java/Home"
+      fi
+    fi
+    ;;
+esac
+
+if [ -z "$JAVA_HOME" ] ; then
+  if [ -r /etc/gentoo-release ] ; then
+    JAVA_HOME=`java-config --jre-home`
+  fi
+fi
+
+if [ -z "$M2_HOME" ] ; then
+  ## resolve links - $0 may be a link to maven's home
+  PRG="$0"
+
+  # need this for relative symlinks
+  while [ -h "$PRG" ] ; do
+    ls=`ls -ld "$PRG"`
+    link=`expr "$ls" : '.*-> \(.*\)$'`
+    if expr "$link" : '/.*' > /dev/null; then
+      PRG="$link"
+    else
+      PRG="`dirname "$PRG"`/$link"
+    fi
+  done
+
+  saveddir=`pwd`
+
+  M2_HOME=`dirname "$PRG"`/..
+
+  # make it fully qualified
+  M2_HOME=`cd "$M2_HOME" && pwd`
+
+  cd "$saveddir"
+  # echo Using m2 at $M2_HOME
+fi
+
+# For Cygwin, ensure paths are in UNIX format before anything is touched
+if $cygwin ; then
+  [ -n "$M2_HOME" ] &&
+    M2_HOME=`cygpath --unix "$M2_HOME"`
+  [ -n "$JAVA_HOME" ] &&
+    JAVA_HOME=`cygpath --unix "$JAVA_HOME"`
+  [ -n "$CLASSPATH" ] &&
+    CLASSPATH=`cygpath --path --unix "$CLASSPATH"`
+fi
+
+# For Mingw, ensure paths are in UNIX format before anything is touched
+if $mingw ; then
+  [ -n "$M2_HOME" ] &&
+    M2_HOME="`(cd "$M2_HOME"; pwd)`"
+  [ -n "$JAVA_HOME" ] &&
+    JAVA_HOME="`(cd "$JAVA_HOME"; pwd)`"
+fi
+
+if [ -z "$JAVA_HOME" ]; then
+  javaExecutable="`which javac`"
+  if [ -n "$javaExecutable" ] && ! [ "`expr \"$javaExecutable\" : '\([^ ]*\)'`" = "no" ]; then
+    # readlink(1) is not available as standard on Solaris 10.
+    readLink=`which readlink`
+    if [ ! `expr "$readLink" : '\([^ ]*\)'` = "no" ]; then
+      if $darwin ; then
+        javaHome="`dirname \"$javaExecutable\"`"
+        javaExecutable="`cd \"$javaHome\" && pwd -P`/javac"
+      else
+        javaExecutable="`readlink -f \"$javaExecutable\"`"
+      fi
+      javaHome="`dirname \"$javaExecutable\"`"
+      javaHome=`expr "$javaHome" : '\(.*\)/bin'`
+      JAVA_HOME="$javaHome"
+      export JAVA_HOME
+    fi
+  fi
+fi
+
+if [ -z "$JAVACMD" ] ; then
+  if [ -n "$JAVA_HOME"  ] ; then
+    if [ -x "$JAVA_HOME/jre/sh/java" ] ; then
+      # IBM's JDK on AIX uses strange locations for the executables
+      JAVACMD="$JAVA_HOME/jre/sh/java"
+    else
+      JAVACMD="$JAVA_HOME/bin/java"
+    fi
+  else
+    JAVACMD="`\\unset -f command; \\command -v java`"
+  fi
+fi
+
+if [ ! -x "$JAVACMD" ] ; then
+  echo "Error: JAVA_HOME is not defined correctly." >&2
+  echo "  We cannot execute $JAVACMD" >&2
+  exit 1
+fi
+
+if [ -z "$JAVA_HOME" ] ; then
+  echo "Warning: JAVA_HOME environment variable is not set."
+fi
+
+CLASSWORLDS_LAUNCHER=org.codehaus.plexus.classworlds.launcher.Launcher
+
+# traverses directory structure from process work directory to filesystem root
+# first directory with .mvn subdirectory is considered project base directory
+find_maven_basedir() {
+
+  if [ -z "$1" ]
+  then
+    echo "Path not specified to find_maven_basedir"
+    return 1
+  fi
+
+  basedir="$1"
+  wdir="$1"
+  while [ "$wdir" != '/' ] ; do
+    if [ -d "$wdir"/.mvn ] ; then
+      basedir=$wdir
+      break
+    fi
+    # workaround for JBEAP-8937 (on Solaris 10/Sparc)
+    if [ -d "${wdir}" ]; then
+      wdir=`cd "$wdir/.."; pwd`
+    fi
+    # end of workaround
+  done
+  echo "${basedir}"
+}
+
+# concatenates all lines of a file
+concat_lines() {
+  if [ -f "$1" ]; then
+    echo "$(tr -s '\n' ' ' < "$1")"
+  fi
+}
+
+BASE_DIR=`find_maven_basedir "$(pwd)"`
+if [ -z "$BASE_DIR" ]; then
+  exit 1;
+fi
+
+##########################################################################################
+# Extension to allow automatically downloading the maven-wrapper.jar from Maven-central
+# This allows using the maven wrapper in projects that prohibit checking in binary data.
+##########################################################################################
+if [ -r "$BASE_DIR/.mvn/wrapper/maven-wrapper.jar" ]; then
+    if [ "$MVNW_VERBOSE" = true ]; then
+      echo "Found .mvn/wrapper/maven-wrapper.jar"
+    fi
+else
+    if [ "$MVNW_VERBOSE" = true ]; then
+      echo "Couldn't find .mvn/wrapper/maven-wrapper.jar, downloading it ..."
+    fi
+    if [ -n "$MVNW_REPOURL" ]; then
+      jarUrl="$MVNW_REPOURL/org/apache/maven/wrapper/maven-wrapper/3.1.0/maven-wrapper-3.1.0.jar"
+    else
+      jarUrl="https://repo.maven.apache.org/maven2/org/apache/maven/wrapper/maven-wrapper/3.1.0/maven-wrapper-3.1.0.jar"
+    fi
+    while IFS="=" read key value; do
+      case "$key" in (wrapperUrl) jarUrl="$value"; break ;;
+      esac
+    done < "$BASE_DIR/.mvn/wrapper/maven-wrapper.properties"
+    if [ "$MVNW_VERBOSE" = true ]; then
+      echo "Downloading from: $jarUrl"
+    fi
+    wrapperJarPath="$BASE_DIR/.mvn/wrapper/maven-wrapper.jar"
+    if $cygwin; then
+      wrapperJarPath=`cygpath --path --windows "$wrapperJarPath"`
+    fi
+
+    if command -v wget > /dev/null; then
+        if [ "$MVNW_VERBOSE" = true ]; then
+          echo "Found wget ... using wget"
+        fi
+        if [ -z "$MVNW_USERNAME" ] || [ -z "$MVNW_PASSWORD" ]; then
+            wget "$jarUrl" -O "$wrapperJarPath" || rm -f "$wrapperJarPath"
+        else
+            wget --http-user=$MVNW_USERNAME --http-password=$MVNW_PASSWORD "$jarUrl" -O "$wrapperJarPath" || rm -f "$wrapperJarPath"
+        fi
+    elif command -v curl > /dev/null; then
+        if [ "$MVNW_VERBOSE" = true ]; then
+          echo "Found curl ... using curl"
+        fi
+        if [ -z "$MVNW_USERNAME" ] || [ -z "$MVNW_PASSWORD" ]; then
+            curl -o "$wrapperJarPath" "$jarUrl" -f
+        else
+            curl --user $MVNW_USERNAME:$MVNW_PASSWORD -o "$wrapperJarPath" "$jarUrl" -f
+        fi
+
+    else
+        if [ "$MVNW_VERBOSE" = true ]; then
+          echo "Falling back to using Java to download"
+        fi
+        javaClass="$BASE_DIR/.mvn/wrapper/MavenWrapperDownloader.java"
+        # For Cygwin, switch paths to Windows format before running javac
+        if $cygwin; then
+          javaClass=`cygpath --path --windows "$javaClass"`
+        fi
+        if [ -e "$javaClass" ]; then
+            if [ ! -e "$BASE_DIR/.mvn/wrapper/MavenWrapperDownloader.class" ]; then
+                if [ "$MVNW_VERBOSE" = true ]; then
+                  echo " - Compiling MavenWrapperDownloader.java ..."
+                fi
+                # Compiling the Java class
+                ("$JAVA_HOME/bin/javac" "$javaClass")
+            fi
+            if [ -e "$BASE_DIR/.mvn/wrapper/MavenWrapperDownloader.class" ]; then
+                # Running the downloader
+                if [ "$MVNW_VERBOSE" = true ]; then
+                  echo " - Running MavenWrapperDownloader.java ..."
+                fi
+                ("$JAVA_HOME/bin/java" -cp .mvn/wrapper MavenWrapperDownloader "$MAVEN_PROJECTBASEDIR")
+            fi
+        fi
+    fi
+fi
+##########################################################################################
+# End of extension
+##########################################################################################
+
+export MAVEN_PROJECTBASEDIR=${MAVEN_BASEDIR:-"$BASE_DIR"}
+if [ "$MVNW_VERBOSE" = true ]; then
+  echo $MAVEN_PROJECTBASEDIR
+fi
+MAVEN_OPTS="$(concat_lines "$MAVEN_PROJECTBASEDIR/.mvn/jvm.config") $MAVEN_OPTS"
+
+# For Cygwin, switch paths to Windows format before running java
+if $cygwin; then
+  [ -n "$M2_HOME" ] &&
+    M2_HOME=`cygpath --path --windows "$M2_HOME"`
+  [ -n "$JAVA_HOME" ] &&
+    JAVA_HOME=`cygpath --path --windows "$JAVA_HOME"`
+  [ -n "$CLASSPATH" ] &&
+    CLASSPATH=`cygpath --path --windows "$CLASSPATH"`
+  [ -n "$MAVEN_PROJECTBASEDIR" ] &&
+    MAVEN_PROJECTBASEDIR=`cygpath --path --windows "$MAVEN_PROJECTBASEDIR"`
+fi
+
+# Provide a "standardized" way to retrieve the CLI args that will
+# work with both Windows and non-Windows executions.
+MAVEN_CMD_LINE_ARGS="$MAVEN_CONFIG $@"
+export MAVEN_CMD_LINE_ARGS
+
+WRAPPER_LAUNCHER=org.apache.maven.wrapper.MavenWrapperMain
+
+exec "$JAVACMD" \
+  $MAVEN_OPTS \
+  $MAVEN_DEBUG_OPTS \
+  -classpath "$MAVEN_PROJECTBASEDIR/.mvn/wrapper/maven-wrapper.jar" \
+  "-Dmaven.home=${M2_HOME}" \
+  "-Dmaven.multiModuleProjectDirectory=${MAVEN_PROJECTBASEDIR}" \
+  ${WRAPPER_LAUNCHER} $MAVEN_CONFIG "$@"

spring-boot/ioc-and-di/mvnw.cmd

@@ -0,0 +1,188 @@
+@REM ----------------------------------------------------------------------------
+@REM Licensed to the Apache Software Foundation (ASF) under one
+@REM or more contributor license agreements.  See the NOTICE file
+@REM distributed with this work for additional information
+@REM regarding copyright ownership.  The ASF licenses this file
+@REM to you under the Apache License, Version 2.0 (the
+@REM "License"); you may not use this file except in compliance
+@REM with the License.  You may obtain a copy of the License at
+@REM
+@REM    https://www.apache.org/licenses/LICENSE-2.0
+@REM
+@REM Unless required by applicable law or agreed to in writing,
+@REM software distributed under the License is distributed on an
+@REM "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+@REM KIND, either express or implied.  See the License for the
+@REM specific language governing permissions and limitations
+@REM under the License.
+@REM ----------------------------------------------------------------------------
+
+@REM ----------------------------------------------------------------------------
+@REM Maven Start Up Batch script
+@REM
+@REM Required ENV vars:
+@REM JAVA_HOME - location of a JDK home dir
+@REM
+@REM Optional ENV vars
+@REM M2_HOME - location of maven2's installed home dir
+@REM MAVEN_BATCH_ECHO - set to 'on' to enable the echoing of the batch commands
+@REM MAVEN_BATCH_PAUSE - set to 'on' to wait for a keystroke before ending
+@REM MAVEN_OPTS - parameters passed to the Java VM when running Maven
+@REM     e.g. to debug Maven itself, use
+@REM set MAVEN_OPTS=-Xdebug -Xrunjdwp:transport=dt_socket,server=y,suspend=y,address=8000
+@REM MAVEN_SKIP_RC - flag to disable loading of mavenrc files
+@REM ----------------------------------------------------------------------------
+
+@REM Begin all REM lines with '@' in case MAVEN_BATCH_ECHO is 'on'
+@echo off
+@REM set title of command window
+title %0
+@REM enable echoing by setting MAVEN_BATCH_ECHO to 'on'
+@if "%MAVEN_BATCH_ECHO%" == "on"  echo %MAVEN_BATCH_ECHO%
+
+@REM set %HOME% to equivalent of $HOME
+if "%HOME%" == "" (set "HOME=%HOMEDRIVE%%HOMEPATH%")
+
+@REM Execute a user defined script before this one
+if not "%MAVEN_SKIP_RC%" == "" goto skipRcPre
+@REM check for pre script, once with legacy .bat ending and once with .cmd ending
+if exist "%USERPROFILE%\mavenrc_pre.bat" call "%USERPROFILE%\mavenrc_pre.bat" %*
+if exist "%USERPROFILE%\mavenrc_pre.cmd" call "%USERPROFILE%\mavenrc_pre.cmd" %*
+:skipRcPre
+
+@setlocal
+
+set ERROR_CODE=0
+
+@REM To isolate internal variables from possible post scripts, we use another setlocal
+@setlocal
+
+@REM ==== START VALIDATION ====
+if not "%JAVA_HOME%" == "" goto OkJHome
+
+echo.
+echo Error: JAVA_HOME not found in your environment. >&2
+echo Please set the JAVA_HOME variable in your environment to match the >&2
+echo location of your Java installation. >&2
+echo.
+goto error
+
+:OkJHome
+if exist "%JAVA_HOME%\bin\java.exe" goto init
+
+echo.
+echo Error: JAVA_HOME is set to an invalid directory. >&2
+echo JAVA_HOME = "%JAVA_HOME%" >&2
+echo Please set the JAVA_HOME variable in your environment to match the >&2
+echo location of your Java installation. >&2
+echo.
+goto error
+
+@REM ==== END VALIDATION ====
+
+:init
+
+@REM Find the project base dir, i.e. the directory that contains the folder ".mvn".
+@REM Fallback to current working directory if not found.
+
+set MAVEN_PROJECTBASEDIR=%MAVEN_BASEDIR%
+IF NOT "%MAVEN_PROJECTBASEDIR%"=="" goto endDetectBaseDir
+
+set EXEC_DIR=%CD%
+set WDIR=%EXEC_DIR%
+:findBaseDir
+IF EXIST "%WDIR%"\.mvn goto baseDirFound
+cd ..
+IF "%WDIR%"=="%CD%" goto baseDirNotFound
+set WDIR=%CD%
+goto findBaseDir
+
+:baseDirFound
+set MAVEN_PROJECTBASEDIR=%WDIR%
+cd "%EXEC_DIR%"
+goto endDetectBaseDir
+
+:baseDirNotFound
+set MAVEN_PROJECTBASEDIR=%EXEC_DIR%
+cd "%EXEC_DIR%"
+
+:endDetectBaseDir
+
+IF NOT EXIST "%MAVEN_PROJECTBASEDIR%\.mvn\jvm.config" goto endReadAdditionalConfig
+
+@setlocal EnableExtensions EnableDelayedExpansion
+for /F "usebackq delims=" %%a in ("%MAVEN_PROJECTBASEDIR%\.mvn\jvm.config") do set JVM_CONFIG_MAVEN_PROPS=!JVM_CONFIG_MAVEN_PROPS! %%a
+@endlocal & set JVM_CONFIG_MAVEN_PROPS=%JVM_CONFIG_MAVEN_PROPS%
+
+:endReadAdditionalConfig
+
+SET MAVEN_JAVA_EXE="%JAVA_HOME%\bin\java.exe"
+set WRAPPER_JAR="%MAVEN_PROJECTBASEDIR%\.mvn\wrapper\maven-wrapper.jar"
+set WRAPPER_LAUNCHER=org.apache.maven.wrapper.MavenWrapperMain
+
+set DOWNLOAD_URL="https://repo.maven.apache.org/maven2/org/apache/maven/wrapper/maven-wrapper/3.1.0/maven-wrapper-3.1.0.jar"
+
+FOR /F "usebackq tokens=1,2 delims==" %%A IN ("%MAVEN_PROJECTBASEDIR%\.mvn\wrapper\maven-wrapper.properties") DO (
+    IF "%%A"=="wrapperUrl" SET DOWNLOAD_URL=%%B
+)
+
+@REM Extension to allow automatically downloading the maven-wrapper.jar from Maven-central
+@REM This allows using the maven wrapper in projects that prohibit checking in binary data.
+if exist %WRAPPER_JAR% (
+    if "%MVNW_VERBOSE%" == "true" (
+        echo Found %WRAPPER_JAR%
+    )
+) else (
+    if not "%MVNW_REPOURL%" == "" (
+        SET DOWNLOAD_URL="%MVNW_REPOURL%/org/apache/maven/wrapper/maven-wrapper/3.1.0/maven-wrapper-3.1.0.jar"
+    )
+    if "%MVNW_VERBOSE%" == "true" (
+        echo Couldn't find %WRAPPER_JAR%, downloading it ...
+        echo Downloading from: %DOWNLOAD_URL%
+    )
+
+    powershell -Command "&{"^
+		"$webclient = new-object System.Net.WebClient;"^
+		"if (-not ([string]::IsNullOrEmpty('%MVNW_USERNAME%') -and [string]::IsNullOrEmpty('%MVNW_PASSWORD%'))) {"^
+		"$webclient.Credentials = new-object System.Net.NetworkCredential('%MVNW_USERNAME%', '%MVNW_PASSWORD%');"^
+		"}"^
+		"[Net.ServicePointManager]::SecurityProtocol = [Net.SecurityProtocolType]::Tls12; $webclient.DownloadFile('%DOWNLOAD_URL%', '%WRAPPER_JAR%')"^
+		"}"
+    if "%MVNW_VERBOSE%" == "true" (
+        echo Finished downloading %WRAPPER_JAR%
+    )
+)
+@REM End of extension
+
+@REM Provide a "standardized" way to retrieve the CLI args that will
+@REM work with both Windows and non-Windows executions.
+set MAVEN_CMD_LINE_ARGS=%*
+
+%MAVEN_JAVA_EXE% ^
+  %JVM_CONFIG_MAVEN_PROPS% ^
+  %MAVEN_OPTS% ^
+  %MAVEN_DEBUG_OPTS% ^
+  -classpath %WRAPPER_JAR% ^
+  "-Dmaven.multiModuleProjectDirectory=%MAVEN_PROJECTBASEDIR%" ^
+  %WRAPPER_LAUNCHER% %MAVEN_CONFIG% %*
+if ERRORLEVEL 1 goto error
+goto end
+
+:error
+set ERROR_CODE=1
+
+:end
+@endlocal & set ERROR_CODE=%ERROR_CODE%
+
+if not "%MAVEN_SKIP_RC%"=="" goto skipRcPost
+@REM check for post script, once with legacy .bat ending and once with .cmd ending
+if exist "%USERPROFILE%\mavenrc_post.bat" call "%USERPROFILE%\mavenrc_post.bat"
+if exist "%USERPROFILE%\mavenrc_post.cmd" call "%USERPROFILE%\mavenrc_post.cmd"
+:skipRcPost
+
+@REM pause the script if MAVEN_BATCH_PAUSE is set to 'on'
+if "%MAVEN_BATCH_PAUSE%"=="on" pause
+
+if "%MAVEN_TERMINATE_CMD%"=="on" exit %ERROR_CODE%
+
+cmd /C exit /B %ERROR_CODE%

spring-boot/ioc-and-di/pom.xml

@@ -0,0 +1,48 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+	xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 https://maven.apache.org/xsd/maven-4.0.0.xsd">
+	<modelVersion>4.0.0</modelVersion>
+	<parent>
+		<groupId>org.springframework.boot</groupId>
+		<artifactId>spring-boot-starter-parent</artifactId>
+		<version>2.7.5</version>
+		<relativePath/> <!-- lookup parent from repository -->
+	</parent>
+	<groupId>io.reflectoring</groupId>
+	<artifactId>ioc-and-di</artifactId>
+	<version>0.0.1-SNAPSHOT</version>
+	<name>ioc-and-di</name>
+	<description>IoC and DI</description>
+	<properties>
+		<java.version>17</java.version>
+	</properties>
+	<dependencies>
+		<dependency>
+			<groupId>org.springframework.boot</groupId>
+			<artifactId>spring-boot-starter</artifactId>
+		</dependency>
+
+		<dependency>
+			<groupId>org.springframework.boot</groupId>
+			<artifactId>spring-boot-starter-test</artifactId>
+			<scope>test</scope>
+		</dependency>
+
+		<dependency>
+			<groupId>org.springframework</groupId>
+			<artifactId>spring-web</artifactId>
+			<version>6.0.0</version>
+		</dependency>
+
+	</dependencies>
+
+	<build>
+		<plugins>
+			<plugin>
+				<groupId>org.springframework.boot</groupId>
+				<artifactId>spring-boot-maven-plugin</artifactId>
+			</plugin>
+		</plugins>
+	</build>
+
+</project>

spring-boot/ioc-and-di/src/main/java/io/reflectoring/iocanddi/IocAndDiApplication.java

@@ -0,0 +1,13 @@
+package io.reflectoring.iocanddi;
+
+import org.springframework.boot.SpringApplication;
+import org.springframework.boot.autoconfigure.SpringBootApplication;
+
+@SpringBootApplication
+public class IocAndDiApplication {
+
+	public static void main(String[] args) {
+		SpringApplication.run(IocAndDiApplication.class, args);
+	}
+
+}

spring-boot/ioc-and-di/src/main/java/io/reflectoring/iocanddi/ShipmentConfiguration.java

@@ -0,0 +1,26 @@
+package io.reflectoring.iocanddi;
+
+import org.springframework.boot.web.client.RestTemplateBuilder;
+import org.springframework.context.annotation.Bean;
+import org.springframework.context.annotation.Configuration;
+import org.springframework.web.client.RestTemplate;
+import org.springframework.web.util.DefaultUriBuilderFactory;
+
+import java.time.Duration;
+
+@Configuration
+public class ShipmentConfiguration {
+
+    @Bean
+    public RestTemplate restTemplate() {
+        RestTemplate restTemplate =
+                new RestTemplateBuilder()
+                        .setConnectTimeout(Duration.ofMillis(1000))
+                        .setReadTimeout(Duration.ofMillis(2000))
+                        .build();
+        restTemplate.setUriTemplateHandler(new DefaultUriBuilderFactory("http://payment-service-uri:8080"));
+
+        return restTemplate;
+    }
+
+}

spring-boot/ioc-and-di/src/main/java/io/reflectoring/iocanddi/noDependencyInjection/ShippingService.java

@@ -0,0 +1,45 @@
+package io.reflectoring.iocanddi.noDependencyInjection;
+
+import org.springframework.boot.jdbc.DataSourceBuilder;
+import org.springframework.boot.web.client.RestTemplateBuilder;
+import org.springframework.web.client.RestTemplate;
+import org.springframework.web.util.DefaultUriBuilderFactory;
+
+import javax.sql.DataSource;
+import java.time.Duration;
+
+public class ShippingService {
+    private RestTemplate restTemplate;
+    private DataSource dataSource;
+
+    public ShippingService() {
+        RestTemplate restTemplate =
+                new RestTemplateBuilder()
+                        .setConnectTimeout(Duration.ofMillis(1000))
+                        .setReadTimeout(Duration.ofMillis(2000))
+                        .build();
+        restTemplate.setUriTemplateHandler(new DefaultUriBuilderFactory("http://payment-service-uri:8080"));
+
+        this.restTemplate = restTemplate;
+
+        DataSourceBuilder dataSourceBuilder = DataSourceBuilder.create();
+        dataSourceBuilder.driverClassName("org.h2.Driver");
+        dataSourceBuilder.url("jdbc:h2:file:C:/temp/test");
+        dataSourceBuilder.username("shipping-user");
+        dataSourceBuilder.password("superSecretPassword");
+        DataSource dataSource = dataSourceBuilder.build();
+
+        this.dataSource = dataSource;
+    }
+
+    private boolean packageIsShippable(String id) {
+        // business logic that make REST and database calls
+        return true;
+    }
+
+    public void ship(String shipmentId) {
+        if (packageIsShippable(shipmentId)) {
+            // ship the thing
+        }
+    }
+}

spring-boot/ioc-and-di/src/main/java/io/reflectoring/iocanddi/withDependencyInjection/DIContainer.java

@@ -0,0 +1,35 @@
+package io.reflectoring.iocanddi.withDependencyInjection;
+
+import org.springframework.boot.jdbc.DataSourceBuilder;
+import org.springframework.boot.web.client.RestTemplateBuilder;
+import org.springframework.web.client.RestTemplate;
+import org.springframework.web.util.DefaultUriBuilderFactory;
+
+import javax.sql.DataSource;
+import java.time.Duration;
+
+public class DIContainer {
+    private RestTemplate getRestTemplate() {
+        RestTemplate restTemplate =
+                new RestTemplateBuilder()
+                        .setConnectTimeout(Duration.ofMillis(1000))
+                        .setReadTimeout(Duration.ofMillis(2000))
+                        .build();
+        restTemplate.setUriTemplateHandler(new DefaultUriBuilderFactory("http://payment-service-uri:8080"));
+
+        return restTemplate;
+    }
+
+    private DataSource getDataSource() {
+        DataSourceBuilder dataSourceBuilder = DataSourceBuilder.create();
+        dataSourceBuilder.driverClassName("org.h2.Driver");
+        dataSourceBuilder.url("jdbc:h2:file:C:/temp/test");
+        dataSourceBuilder.username("shipping-user");
+        dataSourceBuilder.password("superSecretPassword");
+       return dataSourceBuilder.build();
+    }
+
+    public ShippingService getShipmentService() {
+        return new ShippingService(getRestTemplate(), getDataSource());
+    }
+}

spring-boot/ioc-and-di/src/main/java/io/reflectoring/iocanddi/withDependencyInjection/ShippingService.java

@@ -0,0 +1,30 @@
+package io.reflectoring.iocanddi.withDependencyInjection;
+
+import org.springframework.boot.jdbc.DataSourceBuilder;
+import org.springframework.boot.web.client.RestTemplateBuilder;
+import org.springframework.web.client.RestTemplate;
+import org.springframework.web.util.DefaultUriBuilderFactory;
+
+import javax.sql.DataSource;
+import java.time.Duration;
+
+public class ShippingService {
+    private RestTemplate restTemplate;
+    private DataSource dataSource;
+
+    public ShippingService(RestTemplate restTemplate, DataSource dataSource) {
+       this.restTemplate = restTemplate;
+       this.dataSource = dataSource;
+    }
+
+    private boolean packageIsShippable(String id) {
+        // business logic that make REST and database calls
+        return true;
+    }
+
+    public void ship(String shipmentId) {
+        if (packageIsShippable(shipmentId)) {
+            // ship the thing
+        }
+    }
+}

spring-boot/ioc-and-di/src/main/java/io/reflectoring/iocanddi/withSpringDependencyInjection/ShippingService.java

@@ -0,0 +1,20 @@
+package io.reflectoring.iocanddi.withSpringDependencyInjection;
+
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.stereotype.Component;
+import org.springframework.web.client.RestTemplate;
+
+@Component
+public class ShippingService {
+
+    RestTemplate restTemplate;
+
+    @Autowired
+    public ShippingService(RestTemplate restTemplate) {
+        this.restTemplate = restTemplate;
+    }
+
+    public void ship(String shipmentId) {
+        // do stuff
+    }
+}

spring-boot/ioc-and-di/src/main/resources/application.properties

@@ -0,0 +1 @@
+

spring-boot/ioc-and-di/src/test/java/io/reflectoring/iocanddi/IocAndDiApplicationTests.java

@@ -0,0 +1,26 @@
+package io.reflectoring.iocanddi;
+
+import io.reflectoring.iocanddi.withSpringDependencyInjection.ShippingService;
+import org.junit.jupiter.api.Test;
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.boot.test.context.SpringBootTest;
+import org.springframework.web.client.RestTemplate;
+
+import static org.junit.jupiter.api.Assertions.assertNotNull;
+
+@SpringBootTest
+class IocAndDiApplicationTests {
+
+	@Autowired
+	RestTemplate restTemplate;
+
+	@Autowired
+	ShippingService shippingService;
+
+	@Test
+	void contextLoads() {
+		assertNotNull(restTemplate.getUriTemplateHandler());
+		shippingService.ship("te");
+	}
+
+}

spring-boot/ioc-and-di/src/test/java/io/reflectoring/iocanddi/ShippingServiceTest.java

@@ -0,0 +1,28 @@
+package io.reflectoring.iocanddi;
+
+import io.reflectoring.iocanddi.withDependencyInjection.ShippingService;
+import org.junit.jupiter.api.Test;
+import org.mockito.Mockito;
+import org.springframework.http.ResponseEntity;
+import org.springframework.web.client.RestTemplate;
+
+import javax.sql.DataSource;
+
+import static org.mockito.Mockito.when;
+
+public class ShippingServiceTest {
+
+    @Test
+    void testShipping() {
+        RestTemplate restTemplateMock = Mockito.mock(RestTemplate.class);
+        DataSource dataSourceMock = Mockito.mock(DataSource.class);
+
+        when(restTemplateMock.getForEntity("url", String.class))
+                .thenReturn(ResponseEntity.ok("What Ever"));
+
+        ShippingService shippingService = new ShippingService(restTemplateMock, dataSourceMock);
+        shippingService.ship("some Id");
+
+        // assert stuff
+    }
+}

spring-security/getting-started/SecureApplication/.gitignore

@@ -0,0 +1,33 @@
+HELP.md
+target/
+!.mvn/wrapper/maven-wrapper.jar
+!**/src/main/**/target/
+!**/src/test/**/target/
+
+### STS ###
+.apt_generated
+.classpath
+.factorypath
+.project
+.settings
+.springBeans
+.sts4-cache
+
+### IntelliJ IDEA ###
+.idea
+*.iws
+*.iml
+*.ipr
+
+### NetBeans ###
+/nbproject/private/
+/nbbuild/
+/dist/
+/nbdist/
+/.nb-gradle/
+build/
+!**/src/main/**/build/
+!**/src/test/**/build/
+
+### VS Code ###
+.vscode/

spring-security/getting-started/SecureApplication/.mvn/wrapper/maven-wrapper.properties

@@ -0,0 +1,2 @@
+distributionUrl=https://repo.maven.apache.org/maven2/org/apache/maven/apache-maven/3.8.6/apache-maven-3.8.6-bin.zip
+wrapperUrl=https://repo.maven.apache.org/maven2/org/apache/maven/wrapper/maven-wrapper/3.1.0/maven-wrapper-3.1.0.jar

spring-security/getting-started/SecureApplication/mvnw

@@ -0,0 +1,316 @@
+#!/bin/sh
+# ----------------------------------------------------------------------------
+# Licensed to the Apache Software Foundation (ASF) under one
+# or more contributor license agreements.  See the NOTICE file
+# distributed with this work for additional information
+# regarding copyright ownership.  The ASF licenses this file
+# to you under the Apache License, Version 2.0 (the
+# "License"); you may not use this file except in compliance
+# with the License.  You may obtain a copy of the License at
+#
+#    https://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing,
+# software distributed under the License is distributed on an
+# "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+# KIND, either express or implied.  See the License for the
+# specific language governing permissions and limitations
+# under the License.
+# ----------------------------------------------------------------------------
+
+# ----------------------------------------------------------------------------
+# Maven Start Up Batch script
+#
+# Required ENV vars:
+# ------------------
+#   JAVA_HOME - location of a JDK home dir
+#
+# Optional ENV vars
+# -----------------
+#   M2_HOME - location of maven2's installed home dir
+#   MAVEN_OPTS - parameters passed to the Java VM when running Maven
+#     e.g. to debug Maven itself, use
+#       set MAVEN_OPTS=-Xdebug -Xrunjdwp:transport=dt_socket,server=y,suspend=y,address=8000
+#   MAVEN_SKIP_RC - flag to disable loading of mavenrc files
+# ----------------------------------------------------------------------------
+
+if [ -z "$MAVEN_SKIP_RC" ] ; then
+
+  if [ -f /usr/local/etc/mavenrc ] ; then
+    . /usr/local/etc/mavenrc
+  fi
+
+  if [ -f /etc/mavenrc ] ; then
+    . /etc/mavenrc
+  fi
+
+  if [ -f "$HOME/.mavenrc" ] ; then
+    . "$HOME/.mavenrc"
+  fi
+
+fi
+
+# OS specific support.  $var _must_ be set to either true or false.
+cygwin=false;
+darwin=false;
+mingw=false
+case "`uname`" in
+  CYGWIN*) cygwin=true ;;
+  MINGW*) mingw=true;;
+  Darwin*) darwin=true
+    # Use /usr/libexec/java_home if available, otherwise fall back to /Library/Java/Home
+    # See https://developer.apple.com/library/mac/qa/qa1170/_index.html
+    if [ -z "$JAVA_HOME" ]; then
+      if [ -x "/usr/libexec/java_home" ]; then
+        export JAVA_HOME="`/usr/libexec/java_home`"
+      else
+        export JAVA_HOME="/Library/Java/Home"
+      fi
+    fi
+    ;;
+esac
+
+if [ -z "$JAVA_HOME" ] ; then
+  if [ -r /etc/gentoo-release ] ; then
+    JAVA_HOME=`java-config --jre-home`
+  fi
+fi
+
+if [ -z "$M2_HOME" ] ; then
+  ## resolve links - $0 may be a link to maven's home
+  PRG="$0"
+
+  # need this for relative symlinks
+  while [ -h "$PRG" ] ; do
+    ls=`ls -ld "$PRG"`
+    link=`expr "$ls" : '.*-> \(.*\)$'`
+    if expr "$link" : '/.*' > /dev/null; then
+      PRG="$link"
+    else
+      PRG="`dirname "$PRG"`/$link"
+    fi
+  done
+
+  saveddir=`pwd`
+
+  M2_HOME=`dirname "$PRG"`/..
+
+  # make it fully qualified
+  M2_HOME=`cd "$M2_HOME" && pwd`
+
+  cd "$saveddir"
+  # echo Using m2 at $M2_HOME
+fi
+
+# For Cygwin, ensure paths are in UNIX format before anything is touched
+if $cygwin ; then
+  [ -n "$M2_HOME" ] &&
+    M2_HOME=`cygpath --unix "$M2_HOME"`
+  [ -n "$JAVA_HOME" ] &&
+    JAVA_HOME=`cygpath --unix "$JAVA_HOME"`
+  [ -n "$CLASSPATH" ] &&
+    CLASSPATH=`cygpath --path --unix "$CLASSPATH"`
+fi
+
+# For Mingw, ensure paths are in UNIX format before anything is touched
+if $mingw ; then
+  [ -n "$M2_HOME" ] &&
+    M2_HOME="`(cd "$M2_HOME"; pwd)`"
+  [ -n "$JAVA_HOME" ] &&
+    JAVA_HOME="`(cd "$JAVA_HOME"; pwd)`"
+fi
+
+if [ -z "$JAVA_HOME" ]; then
+  javaExecutable="`which javac`"
+  if [ -n "$javaExecutable" ] && ! [ "`expr \"$javaExecutable\" : '\([^ ]*\)'`" = "no" ]; then
+    # readlink(1) is not available as standard on Solaris 10.
+    readLink=`which readlink`
+    if [ ! `expr "$readLink" : '\([^ ]*\)'` = "no" ]; then
+      if $darwin ; then
+        javaHome="`dirname \"$javaExecutable\"`"
+        javaExecutable="`cd \"$javaHome\" && pwd -P`/javac"
+      else
+        javaExecutable="`readlink -f \"$javaExecutable\"`"
+      fi
+      javaHome="`dirname \"$javaExecutable\"`"
+      javaHome=`expr "$javaHome" : '\(.*\)/bin'`
+      JAVA_HOME="$javaHome"
+      export JAVA_HOME
+    fi
+  fi
+fi
+
+if [ -z "$JAVACMD" ] ; then
+  if [ -n "$JAVA_HOME"  ] ; then
+    if [ -x "$JAVA_HOME/jre/sh/java" ] ; then
+      # IBM's JDK on AIX uses strange locations for the executables
+      JAVACMD="$JAVA_HOME/jre/sh/java"
+    else
+      JAVACMD="$JAVA_HOME/bin/java"
+    fi
+  else
+    JAVACMD="`\\unset -f command; \\command -v java`"
+  fi
+fi
+
+if [ ! -x "$JAVACMD" ] ; then
+  echo "Error: JAVA_HOME is not defined correctly." >&2
+  echo "  We cannot execute $JAVACMD" >&2
+  exit 1
+fi
+
+if [ -z "$JAVA_HOME" ] ; then
+  echo "Warning: JAVA_HOME environment variable is not set."
+fi
+
+CLASSWORLDS_LAUNCHER=org.codehaus.plexus.classworlds.launcher.Launcher
+
+# traverses directory structure from process work directory to filesystem root
+# first directory with .mvn subdirectory is considered project base directory
+find_maven_basedir() {
+
+  if [ -z "$1" ]
+  then
+    echo "Path not specified to find_maven_basedir"
+    return 1
+  fi
+
+  basedir="$1"
+  wdir="$1"
+  while [ "$wdir" != '/' ] ; do
+    if [ -d "$wdir"/.mvn ] ; then
+      basedir=$wdir
+      break
+    fi
+    # workaround for JBEAP-8937 (on Solaris 10/Sparc)
+    if [ -d "${wdir}" ]; then
+      wdir=`cd "$wdir/.."; pwd`
+    fi
+    # end of workaround
+  done
+  echo "${basedir}"
+}
+
+# concatenates all lines of a file
+concat_lines() {
+  if [ -f "$1" ]; then
+    echo "$(tr -s '\n' ' ' < "$1")"
+  fi
+}
+
+BASE_DIR=`find_maven_basedir "$(pwd)"`
+if [ -z "$BASE_DIR" ]; then
+  exit 1;
+fi
+
+##########################################################################################
+# Extension to allow automatically downloading the maven-wrapper.jar from Maven-central
+# This allows using the maven wrapper in projects that prohibit checking in binary data.
+##########################################################################################
+if [ -r "$BASE_DIR/.mvn/wrapper/maven-wrapper.jar" ]; then
+    if [ "$MVNW_VERBOSE" = true ]; then
+      echo "Found .mvn/wrapper/maven-wrapper.jar"
+    fi
+else
+    if [ "$MVNW_VERBOSE" = true ]; then
+      echo "Couldn't find .mvn/wrapper/maven-wrapper.jar, downloading it ..."
+    fi
+    if [ -n "$MVNW_REPOURL" ]; then
+      jarUrl="$MVNW_REPOURL/org/apache/maven/wrapper/maven-wrapper/3.1.0/maven-wrapper-3.1.0.jar"
+    else
+      jarUrl="https://repo.maven.apache.org/maven2/org/apache/maven/wrapper/maven-wrapper/3.1.0/maven-wrapper-3.1.0.jar"
+    fi
+    while IFS="=" read key value; do
+      case "$key" in (wrapperUrl) jarUrl="$value"; break ;;
+      esac
+    done < "$BASE_DIR/.mvn/wrapper/maven-wrapper.properties"
+    if [ "$MVNW_VERBOSE" = true ]; then
+      echo "Downloading from: $jarUrl"
+    fi
+    wrapperJarPath="$BASE_DIR/.mvn/wrapper/maven-wrapper.jar"
+    if $cygwin; then
+      wrapperJarPath=`cygpath --path --windows "$wrapperJarPath"`
+    fi
+
+    if command -v wget > /dev/null; then
+        if [ "$MVNW_VERBOSE" = true ]; then
+          echo "Found wget ... using wget"
+        fi
+        if [ -z "$MVNW_USERNAME" ] || [ -z "$MVNW_PASSWORD" ]; then
+            wget "$jarUrl" -O "$wrapperJarPath" || rm -f "$wrapperJarPath"
+        else
+            wget --http-user=$MVNW_USERNAME --http-password=$MVNW_PASSWORD "$jarUrl" -O "$wrapperJarPath" || rm -f "$wrapperJarPath"
+        fi
+    elif command -v curl > /dev/null; then
+        if [ "$MVNW_VERBOSE" = true ]; then
+          echo "Found curl ... using curl"
+        fi
+        if [ -z "$MVNW_USERNAME" ] || [ -z "$MVNW_PASSWORD" ]; then
+            curl -o "$wrapperJarPath" "$jarUrl" -f
+        else
+            curl --user $MVNW_USERNAME:$MVNW_PASSWORD -o "$wrapperJarPath" "$jarUrl" -f
+        fi
+
+    else
+        if [ "$MVNW_VERBOSE" = true ]; then
+          echo "Falling back to using Java to download"
+        fi
+        javaClass="$BASE_DIR/.mvn/wrapper/MavenWrapperDownloader.java"
+        # For Cygwin, switch paths to Windows format before running javac
+        if $cygwin; then
+          javaClass=`cygpath --path --windows "$javaClass"`
+        fi
+        if [ -e "$javaClass" ]; then
+            if [ ! -e "$BASE_DIR/.mvn/wrapper/MavenWrapperDownloader.class" ]; then
+                if [ "$MVNW_VERBOSE" = true ]; then
+                  echo " - Compiling MavenWrapperDownloader.java ..."
+                fi
+                # Compiling the Java class
+                ("$JAVA_HOME/bin/javac" "$javaClass")
+            fi
+            if [ -e "$BASE_DIR/.mvn/wrapper/MavenWrapperDownloader.class" ]; then
+                # Running the downloader
+                if [ "$MVNW_VERBOSE" = true ]; then
+                  echo " - Running MavenWrapperDownloader.java ..."
+                fi
+                ("$JAVA_HOME/bin/java" -cp .mvn/wrapper MavenWrapperDownloader "$MAVEN_PROJECTBASEDIR")
+            fi
+        fi
+    fi
+fi
+##########################################################################################
+# End of extension
+##########################################################################################
+
+export MAVEN_PROJECTBASEDIR=${MAVEN_BASEDIR:-"$BASE_DIR"}
+if [ "$MVNW_VERBOSE" = true ]; then
+  echo $MAVEN_PROJECTBASEDIR
+fi
+MAVEN_OPTS="$(concat_lines "$MAVEN_PROJECTBASEDIR/.mvn/jvm.config") $MAVEN_OPTS"
+
+# For Cygwin, switch paths to Windows format before running java
+if $cygwin; then
+  [ -n "$M2_HOME" ] &&
+    M2_HOME=`cygpath --path --windows "$M2_HOME"`
+  [ -n "$JAVA_HOME" ] &&
+    JAVA_HOME=`cygpath --path --windows "$JAVA_HOME"`
+  [ -n "$CLASSPATH" ] &&
+    CLASSPATH=`cygpath --path --windows "$CLASSPATH"`
+  [ -n "$MAVEN_PROJECTBASEDIR" ] &&
+    MAVEN_PROJECTBASEDIR=`cygpath --path --windows "$MAVEN_PROJECTBASEDIR"`
+fi
+
+# Provide a "standardized" way to retrieve the CLI args that will
+# work with both Windows and non-Windows executions.
+MAVEN_CMD_LINE_ARGS="$MAVEN_CONFIG $@"
+export MAVEN_CMD_LINE_ARGS
+
+WRAPPER_LAUNCHER=org.apache.maven.wrapper.MavenWrapperMain
+
+exec "$JAVACMD" \
+  $MAVEN_OPTS \
+  $MAVEN_DEBUG_OPTS \
+  -classpath "$MAVEN_PROJECTBASEDIR/.mvn/wrapper/maven-wrapper.jar" \
+  "-Dmaven.home=${M2_HOME}" \
+  "-Dmaven.multiModuleProjectDirectory=${MAVEN_PROJECTBASEDIR}" \
+  ${WRAPPER_LAUNCHER} $MAVEN_CONFIG "$@"

spring-security/getting-started/SecureApplication/mvnw.cmd

@@ -0,0 +1,188 @@
+@REM ----------------------------------------------------------------------------
+@REM Licensed to the Apache Software Foundation (ASF) under one
+@REM or more contributor license agreements.  See the NOTICE file
+@REM distributed with this work for additional information
+@REM regarding copyright ownership.  The ASF licenses this file
+@REM to you under the Apache License, Version 2.0 (the
+@REM "License"); you may not use this file except in compliance
+@REM with the License.  You may obtain a copy of the License at
+@REM
+@REM    https://www.apache.org/licenses/LICENSE-2.0
+@REM
+@REM Unless required by applicable law or agreed to in writing,
+@REM software distributed under the License is distributed on an
+@REM "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+@REM KIND, either express or implied.  See the License for the
+@REM specific language governing permissions and limitations
+@REM under the License.
+@REM ----------------------------------------------------------------------------
+
+@REM ----------------------------------------------------------------------------
+@REM Maven Start Up Batch script
+@REM
+@REM Required ENV vars:
+@REM JAVA_HOME - location of a JDK home dir
+@REM
+@REM Optional ENV vars
+@REM M2_HOME - location of maven2's installed home dir
+@REM MAVEN_BATCH_ECHO - set to 'on' to enable the echoing of the batch commands
+@REM MAVEN_BATCH_PAUSE - set to 'on' to wait for a keystroke before ending
+@REM MAVEN_OPTS - parameters passed to the Java VM when running Maven
+@REM     e.g. to debug Maven itself, use
+@REM set MAVEN_OPTS=-Xdebug -Xrunjdwp:transport=dt_socket,server=y,suspend=y,address=8000
+@REM MAVEN_SKIP_RC - flag to disable loading of mavenrc files
+@REM ----------------------------------------------------------------------------
+
+@REM Begin all REM lines with '@' in case MAVEN_BATCH_ECHO is 'on'
+@echo off
+@REM set title of command window
+title %0
+@REM enable echoing by setting MAVEN_BATCH_ECHO to 'on'
+@if "%MAVEN_BATCH_ECHO%" == "on"  echo %MAVEN_BATCH_ECHO%
+
+@REM set %HOME% to equivalent of $HOME
+if "%HOME%" == "" (set "HOME=%HOMEDRIVE%%HOMEPATH%")
+
+@REM Execute a user defined script before this one
+if not "%MAVEN_SKIP_RC%" == "" goto skipRcPre
+@REM check for pre script, once with legacy .bat ending and once with .cmd ending
+if exist "%USERPROFILE%\mavenrc_pre.bat" call "%USERPROFILE%\mavenrc_pre.bat" %*
+if exist "%USERPROFILE%\mavenrc_pre.cmd" call "%USERPROFILE%\mavenrc_pre.cmd" %*
+:skipRcPre
+
+@setlocal
+
+set ERROR_CODE=0
+
+@REM To isolate internal variables from possible post scripts, we use another setlocal
+@setlocal
+
+@REM ==== START VALIDATION ====
+if not "%JAVA_HOME%" == "" goto OkJHome
+
+echo.
+echo Error: JAVA_HOME not found in your environment. >&2
+echo Please set the JAVA_HOME variable in your environment to match the >&2
+echo location of your Java installation. >&2
+echo.
+goto error
+
+:OkJHome
+if exist "%JAVA_HOME%\bin\java.exe" goto init
+
+echo.
+echo Error: JAVA_HOME is set to an invalid directory. >&2
+echo JAVA_HOME = "%JAVA_HOME%" >&2
+echo Please set the JAVA_HOME variable in your environment to match the >&2
+echo location of your Java installation. >&2
+echo.
+goto error
+
+@REM ==== END VALIDATION ====
+
+:init
+
+@REM Find the project base dir, i.e. the directory that contains the folder ".mvn".
+@REM Fallback to current working directory if not found.
+
+set MAVEN_PROJECTBASEDIR=%MAVEN_BASEDIR%
+IF NOT "%MAVEN_PROJECTBASEDIR%"=="" goto endDetectBaseDir
+
+set EXEC_DIR=%CD%
+set WDIR=%EXEC_DIR%
+:findBaseDir
+IF EXIST "%WDIR%"\.mvn goto baseDirFound
+cd ..
+IF "%WDIR%"=="%CD%" goto baseDirNotFound
+set WDIR=%CD%
+goto findBaseDir
+
+:baseDirFound
+set MAVEN_PROJECTBASEDIR=%WDIR%
+cd "%EXEC_DIR%"
+goto endDetectBaseDir
+
+:baseDirNotFound
+set MAVEN_PROJECTBASEDIR=%EXEC_DIR%
+cd "%EXEC_DIR%"
+
+:endDetectBaseDir
+
+IF NOT EXIST "%MAVEN_PROJECTBASEDIR%\.mvn\jvm.config" goto endReadAdditionalConfig
+
+@setlocal EnableExtensions EnableDelayedExpansion
+for /F "usebackq delims=" %%a in ("%MAVEN_PROJECTBASEDIR%\.mvn\jvm.config") do set JVM_CONFIG_MAVEN_PROPS=!JVM_CONFIG_MAVEN_PROPS! %%a
+@endlocal & set JVM_CONFIG_MAVEN_PROPS=%JVM_CONFIG_MAVEN_PROPS%
+
+:endReadAdditionalConfig
+
+SET MAVEN_JAVA_EXE="%JAVA_HOME%\bin\java.exe"
+set WRAPPER_JAR="%MAVEN_PROJECTBASEDIR%\.mvn\wrapper\maven-wrapper.jar"
+set WRAPPER_LAUNCHER=org.apache.maven.wrapper.MavenWrapperMain
+
+set DOWNLOAD_URL="https://repo.maven.apache.org/maven2/org/apache/maven/wrapper/maven-wrapper/3.1.0/maven-wrapper-3.1.0.jar"
+
+FOR /F "usebackq tokens=1,2 delims==" %%A IN ("%MAVEN_PROJECTBASEDIR%\.mvn\wrapper\maven-wrapper.properties") DO (
+    IF "%%A"=="wrapperUrl" SET DOWNLOAD_URL=%%B
+)
+
+@REM Extension to allow automatically downloading the maven-wrapper.jar from Maven-central
+@REM This allows using the maven wrapper in projects that prohibit checking in binary data.
+if exist %WRAPPER_JAR% (
+    if "%MVNW_VERBOSE%" == "true" (
+        echo Found %WRAPPER_JAR%
+    )
+) else (
+    if not "%MVNW_REPOURL%" == "" (
+        SET DOWNLOAD_URL="%MVNW_REPOURL%/org/apache/maven/wrapper/maven-wrapper/3.1.0/maven-wrapper-3.1.0.jar"
+    )
+    if "%MVNW_VERBOSE%" == "true" (
+        echo Couldn't find %WRAPPER_JAR%, downloading it ...
+        echo Downloading from: %DOWNLOAD_URL%
+    )
+
+    powershell -Command "&{"^
+		"$webclient = new-object System.Net.WebClient;"^
+		"if (-not ([string]::IsNullOrEmpty('%MVNW_USERNAME%') -and [string]::IsNullOrEmpty('%MVNW_PASSWORD%'))) {"^
+		"$webclient.Credentials = new-object System.Net.NetworkCredential('%MVNW_USERNAME%', '%MVNW_PASSWORD%');"^
+		"}"^
+		"[Net.ServicePointManager]::SecurityProtocol = [Net.SecurityProtocolType]::Tls12; $webclient.DownloadFile('%DOWNLOAD_URL%', '%WRAPPER_JAR%')"^
+		"}"
+    if "%MVNW_VERBOSE%" == "true" (
+        echo Finished downloading %WRAPPER_JAR%
+    )
+)
+@REM End of extension
+
+@REM Provide a "standardized" way to retrieve the CLI args that will
+@REM work with both Windows and non-Windows executions.
+set MAVEN_CMD_LINE_ARGS=%*
+
+%MAVEN_JAVA_EXE% ^
+  %JVM_CONFIG_MAVEN_PROPS% ^
+  %MAVEN_OPTS% ^
+  %MAVEN_DEBUG_OPTS% ^
+  -classpath %WRAPPER_JAR% ^
+  "-Dmaven.multiModuleProjectDirectory=%MAVEN_PROJECTBASEDIR%" ^
+  %WRAPPER_LAUNCHER% %MAVEN_CONFIG% %*
+if ERRORLEVEL 1 goto error
+goto end
+
+:error
+set ERROR_CODE=1
+
+:end
+@endlocal & set ERROR_CODE=%ERROR_CODE%
+
+if not "%MAVEN_SKIP_RC%"=="" goto skipRcPost
+@REM check for post script, once with legacy .bat ending and once with .cmd ending
+if exist "%USERPROFILE%\mavenrc_post.bat" call "%USERPROFILE%\mavenrc_post.bat"
+if exist "%USERPROFILE%\mavenrc_post.cmd" call "%USERPROFILE%\mavenrc_post.cmd"
+:skipRcPost
+
+@REM pause the script if MAVEN_BATCH_PAUSE is set to 'on'
+if "%MAVEN_BATCH_PAUSE%"=="on" pause
+
+if "%MAVEN_TERMINATE_CMD%"=="on" exit %ERROR_CODE%
+
+cmd /C exit /B %ERROR_CODE%

spring-security/getting-started/SecureApplication/pom.xml

@@ -0,0 +1,114 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+	xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 https://maven.apache.org/xsd/maven-4.0.0.xsd">
+	<modelVersion>4.0.0</modelVersion>
+	<parent>
+		<groupId>org.springframework.boot</groupId>
+		<artifactId>spring-boot-starter-parent</artifactId>
+		<version>2.7.5</version>
+		<relativePath/> <!-- lookup parent from repository -->
+	</parent>
+	<groupId>com.reflectoring</groupId>
+	<artifactId>security</artifactId>
+	<version>0.0.1-SNAPSHOT</version>
+	<name>security</name>
+	<description>Spring Security sample project</description>
+	<properties>
+		<java.version>11</java.version>
+	</properties>
+	<dependencies>
+		<dependency>
+			<groupId>org.springframework.boot</groupId>
+			<artifactId>spring-boot-starter-security</artifactId>
+		</dependency>
+		<dependency>
+			<groupId>org.springframework.boot</groupId>
+			<artifactId>spring-boot-starter-web</artifactId>
+		</dependency>
+
+		<dependency>
+			<groupId>org.springframework.boot</groupId>
+			<artifactId>spring-boot-starter-test</artifactId>
+			<scope>test</scope>
+		</dependency>
+		<dependency>
+			<groupId>org.springframework.security</groupId>
+			<artifactId>spring-security-test</artifactId>
+			<scope>test</scope>
+		</dependency>
+		<dependency>
+			<groupId>org.springframework.boot</groupId>
+			<artifactId>spring-boot-starter-thymeleaf</artifactId>
+		</dependency>
+		<dependency>
+			<groupId>org.projectlombok</groupId>
+			<artifactId>lombok</artifactId>
+			<version>1.18.20</version>
+			<scope>provided</scope>
+		</dependency>
+		<dependency>
+			<groupId>org.projectlombok</groupId>
+			<artifactId>lombok-mapstruct-binding</artifactId>
+			<version>0.2.0</version>
+		</dependency>
+		<dependency>
+			<groupId>org.springframework.boot</groupId>
+			<artifactId>spring-boot-starter-data-jpa</artifactId>
+		</dependency>
+		<dependency>
+			<groupId>org.mapstruct</groupId>
+			<artifactId>mapstruct</artifactId>
+			<version>1.4.2.Final</version>
+		</dependency>
+		<dependency>
+			<groupId>org.hsqldb</groupId>
+			<artifactId>hsqldb</artifactId>
+			<version>2.4.0</version>
+			<scope>runtime</scope>
+		</dependency>
+		<dependency>
+			<groupId>org.zalando</groupId>
+			<artifactId>problem-spring-web</artifactId>
+			<version>0.27.0</version>
+		</dependency>
+		<!-- https://mvnrepository.com/artifact/org.hamcrest/hamcrest-library -->
+		<dependency>
+			<groupId>org.hamcrest</groupId>
+			<artifactId>hamcrest-library</artifactId>
+			<version>2.2</version>
+			<scope>test</scope>
+		</dependency>
+
+	</dependencies>
+
+	<build>
+		<plugins>
+			<plugin>
+				<groupId>org.springframework.boot</groupId>
+				<artifactId>spring-boot-maven-plugin</artifactId>
+			</plugin>
+			<plugin>
+				<groupId>org.apache.maven.plugins</groupId>
+				<artifactId>maven-compiler-plugin</artifactId>
+				<version>3.8.0</version>
+				<configuration>
+					<source>11</source>
+					<target>11</target>
+					<annotationProcessorPaths>
+						<path>
+							<groupId>org.projectlombok</groupId>
+							<artifactId>lombok</artifactId>
+							<version>1.18.20</version>
+						</path>
+						<path>
+							<groupId>org.mapstruct</groupId>
+							<artifactId>mapstruct-processor</artifactId>
+							<version>1.4.2.Final</version>
+						</path>
+					</annotationProcessorPaths>
+				</configuration>
+			</plugin>
+		</plugins>
+	</build>
+
+</project>

spring-security/getting-started/SecureApplication/src/main/java/com/reflectoring/security/CustomHeaderValidatorFilter.java

@@ -0,0 +1,37 @@
+package com.reflectoring.security;
+
+import com.fasterxml.jackson.databind.ObjectMapper;
+import com.reflectoring.security.exception.CommonException;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+import org.springframework.util.StringUtils;
+import org.springframework.web.filter.OncePerRequestFilter;
+
+import javax.servlet.FilterChain;
+import javax.servlet.ServletException;
+import javax.servlet.http.HttpServletRequest;
+import javax.servlet.http.HttpServletResponse;
+import java.io.IOException;
+
+public class CustomHeaderValidatorFilter extends OncePerRequestFilter {
+
+    private static final Logger log = LoggerFactory.getLogger(CustomHeaderValidatorFilter.class);
+
+    @Override
+    protected boolean shouldNotFilter(HttpServletRequest request) throws ServletException {
+        String path = request.getRequestURI();
+        return path.startsWith("/library/books/all");
+    }
+
+    @Override
+    protected void doFilterInternal(HttpServletRequest request, HttpServletResponse response, FilterChain filterChain) throws ServletException, IOException {
+        log.info("Custom filter called...");
+        if (StringUtils.isEmpty(request.getHeader("X-Application-Name"))) {
+            response.setStatus(HttpServletResponse.SC_FORBIDDEN);
+            response.setContentType("application/json");
+            response.getOutputStream().println(new ObjectMapper().writeValueAsString(CommonException.headerError()));
+        } else {
+            filterChain.doFilter(request, response);
+        }
+    }
+}

spring-security/getting-started/SecureApplication/src/main/java/com/reflectoring/security/SecurityApplication.java

@@ -0,0 +1,13 @@
+package com.reflectoring.security;
+
+import org.springframework.boot.SpringApplication;
+import org.springframework.boot.autoconfigure.SpringBootApplication;
+
+@SpringBootApplication
+public class SecurityApplication {
+
+	public static void main(String[] args) {
+		SpringApplication.run(SecurityApplication.class, args);
+	}
+
+}

spring-security/getting-started/SecureApplication/src/main/java/com/reflectoring/security/config/BasicAuthProperties.java

@@ -0,0 +1,58 @@
+package com.reflectoring.security.config;
+
+import org.springframework.boot.context.properties.ConfigurationProperties;
+import org.springframework.security.core.userdetails.User;
+import org.springframework.security.core.userdetails.UserDetails;
+import org.springframework.security.crypto.factory.PasswordEncoderFactories;
+
+import java.util.Map;
+import java.util.Set;
+import java.util.stream.Collectors;
+
+@ConfigurationProperties(prefix = "auth")
+public class BasicAuthProperties {
+
+    private Map<String, UserDetail> users;
+
+    public Map<String, UserDetail> getUsers() {
+        return users;
+    }
+
+    public void setUsers(Map<String, UserDetail> users) {
+        this.users = users;
+    }
+
+    public Set<UserDetails> getUserDetails() {
+        return this.users.entrySet().stream()
+                .map(entry -> User.withUsername(entry.getKey())
+                        .passwordEncoder(PasswordEncoderFactories.createDelegatingPasswordEncoder()::encode)
+                        .password(entry.getValue().getPassword())
+                        .roles(entry.getValue().getRole().toUpperCase())
+                        .build())
+                .collect(Collectors.toSet());
+    }
+
+    private static class UserDetail {
+
+        private String password;
+
+        private String role;
+
+        public String getPassword() {
+            return password;
+        }
+
+        public void setPassword(String password) {
+            this.password = password;
+        }
+
+        public String getRole() {
+            return role;
+        }
+
+        public void setRole(String role) {
+            this.role = role;
+        }
+    }
+
+}

spring-security/getting-started/SecureApplication/src/main/java/com/reflectoring/security/config/SecurityConfiguration.java

@@ -0,0 +1,186 @@
+package com.reflectoring.security.config;
+
+import com.reflectoring.security.CustomHeaderValidatorFilter;
+import com.reflectoring.security.exception.UserAuthenticationErrorHandler;
+import com.reflectoring.security.exception.UserForbiddenErrorHandler;
+import org.springframework.boot.context.properties.EnableConfigurationProperties;
+import org.springframework.context.annotation.Bean;
+import org.springframework.context.annotation.Configuration;
+import org.springframework.core.annotation.Order;
+import org.springframework.http.HttpMethod;
+import org.springframework.security.config.annotation.method.configuration.EnableGlobalMethodSecurity;
+import org.springframework.security.config.annotation.method.configuration.EnableMethodSecurity;
+import org.springframework.security.config.annotation.web.builders.HttpSecurity;
+import org.springframework.security.config.annotation.web.configuration.EnableWebSecurity;
+import org.springframework.security.config.annotation.web.configuration.WebSecurityCustomizer;
+import org.springframework.security.config.http.SessionCreationPolicy;
+import org.springframework.security.core.userdetails.UserDetailsService;
+import org.springframework.security.provisioning.InMemoryUserDetailsManager;
+import org.springframework.security.web.AuthenticationEntryPoint;
+import org.springframework.security.web.SecurityFilterChain;
+import org.springframework.security.web.authentication.www.BasicAuthenticationFilter;
+
+@Configuration
+@EnableWebSecurity
+@EnableGlobalMethodSecurity(prePostEnabled = true)
+@EnableConfigurationProperties(BasicAuthProperties.class)
+public class SecurityConfiguration {
+
+    private final BasicAuthProperties props;
+
+    public SecurityConfiguration(BasicAuthProperties props) {
+        this.props = props;
+    }
+
+    @Bean
+    @Order(1)
+    public SecurityFilterChain bookFilterChain(HttpSecurity http) throws Exception {
+        http
+                .csrf().disable()
+                .sessionManagement(session -> session
+                        .sessionCreationPolicy(SessionCreationPolicy.STATELESS))
+                .antMatcher("/library/**")
+                .authorizeRequests()
+                .antMatchers(HttpMethod.GET, "/library/**").hasRole("USER").anyRequest().authenticated()
+                .and()
+                .httpBasic()
+                .and()
+                .exceptionHandling(exception -> exception
+                        .authenticationEntryPoint(userAuthenticationErrorHandler())
+                        .accessDeniedHandler(new UserForbiddenErrorHandler()));
+
+        http.addFilterBefore(customHeaderValidatorFilter(), BasicAuthenticationFilter.class);
+
+        return http.build();
+    }
+
+    @Bean
+    public CustomHeaderValidatorFilter customHeaderValidatorFilter() {
+        return new CustomHeaderValidatorFilter();
+    }
+
+    @Bean
+    public WebSecurityCustomizer webSecurityCustomizer() {
+        return (web) -> web.ignoring().antMatchers("/library/info");
+    }
+
+    @Bean
+    public UserDetailsService userDetailsService() {
+        return new InMemoryUserDetailsManager(props.getUserDetails());
+    }
+
+    /*@Bean
+    public AuthenticationManager authenticationManager(HttpSecurity http) throws Exception {
+
+        var builder = http.getSharedObject(AuthenticationManagerBuilder.class)
+                .userDetailsService(new InMemoryUserDetailsManager(props.getUserDetails()));
+        return builder.and().build();
+    }*/
+
+    @Bean
+    public AuthenticationEntryPoint userAuthenticationErrorHandler() {
+        UserAuthenticationErrorHandler userAuthenticationErrorHandler =
+                new UserAuthenticationErrorHandler();
+        userAuthenticationErrorHandler.setRealmName("Basic Authentication");
+        return userAuthenticationErrorHandler;
+    }
+
+    /*@Bean
+    public UsernamePasswordAuthenticationFilter usernamePasswordAuthenticationFilter(HttpSecurity http) throws Exception {
+
+        //AuthenticationEntryPoint authenticationEntryPoint = new UserAuthenticationErrorHandler();
+        return new UsernamePasswordAuthenticationFilter(authenticationManager(http));
+    }*/
+
+    public static final String[] ENDPOINTS_WHITELIST = {
+            "/css/**",
+            "/login",
+            "/home"
+    };
+    public static final String LOGIN_URL = "/login";
+    public static final String LOGIN_FAIL_URL = LOGIN_URL + "?error";
+    public static final String DEFAULT_SUCCESS_URL = "/home";
+    public static final String USERNAME = "username";
+    public static final String PASSWORD = "password";
+
+    @Bean
+    @Order(1)
+    public SecurityFilterChain filterChain(HttpSecurity http) throws Exception {
+        // Requests
+        http.authorizeRequests(request -> request.antMatchers(ENDPOINTS_WHITELIST).hasRole("ADMIN")
+                        .anyRequest().authenticated())
+                // CSRF
+                .csrf().disable()
+                .antMatcher("/login")
+                //.formLogin(Customizer.withDefaults())
+                .formLogin(form -> form
+                        .loginPage(LOGIN_URL)
+                        .loginProcessingUrl(LOGIN_URL)
+                        .failureUrl(LOGIN_FAIL_URL)
+                        .usernameParameter(USERNAME)
+                        .passwordParameter(PASSWORD)
+                        .defaultSuccessUrl(DEFAULT_SUCCESS_URL))
+                //.logout(Customizer.withDefaults())
+                .logout(logout -> logout
+                        .logoutUrl("/logout")
+                        .invalidateHttpSession(true)
+                        .deleteCookies("JSESSIONID")
+                        .logoutSuccessUrl(LOGIN_URL + "?logout"))
+                //.sessionManagement(Customizer.withDefaults())
+                .sessionManagement(session -> session
+                        .sessionCreationPolicy(SessionCreationPolicy.ALWAYS)
+                        .invalidSessionUrl("/invalidSession")
+                        .maximumSessions(1)
+                        .maxSessionsPreventsLogin(true));
+
+        return http.build();
+    }
+
+        /*private AuthenticationFilter authenticationFilter(HttpSecurity http) {
+            AuthenticationFilter filter = new AuthenticationFilter(
+                    resolver(http), authenticationConverter());
+            filter.setSuccessHandler((request, response, auth) -> {});
+            return filter;
+        }
+
+        public AuthenticationConverter authenticationConverter() {
+            return new BasicAuthenticationConverter();
+        }
+
+        public AuthenticationManagerResolver<HttpServletRequest> resolver(HttpSecurity http) {
+            return request -> {
+                if (request.getPathInfo().contains("login")) {
+                    try {
+                        return customAuthenticationManager(http);
+                    } catch (Exception e) {
+                        e.printStackTrace();
+                    }
+                }
+                return null;
+            };
+        }
+
+        public AuthenticationManager customAuthenticationManager(HttpSecurity http)
+                throws Exception {
+            return http.getSharedObject(AuthenticationManagerBuilder.class)
+                    .userDetailsService(userDetailsService())
+                    .passwordEncoder(passwordEncoder())
+                    .and()
+                    .build();
+        }
+
+        public InMemoryUserDetailsManager userDetailsService() {
+            UserDetails admin = User.withUsername("user")
+                    .password(passwordEncoder().encode("userpass"))
+                    .roles("USER")
+                    .build();
+            return new InMemoryUserDetailsManager(admin);
+        }
+
+        public PasswordEncoder passwordEncoder() {
+            return new BCryptPasswordEncoder();
+        }*/
+
+
+}
+

spring-security/getting-started/SecureApplication/src/main/java/com/reflectoring/security/exception/CommonException.java

@@ -0,0 +1,32 @@
+package com.reflectoring.security.exception;
+
+import com.fasterxml.jackson.annotation.JsonIgnoreProperties;
+import com.fasterxml.jackson.annotation.JsonInclude;
+import org.zalando.problem.AbstractThrowableProblem;
+import org.zalando.problem.StatusType;
+
+import static com.fasterxml.jackson.annotation.JsonInclude.Include.NON_EMPTY;
+import static org.zalando.problem.Status.*;
+
+@JsonInclude(NON_EMPTY)
+@JsonIgnoreProperties({"stackTrace", "type", "title", "message", "localizedMessage", "parameters"})
+public class CommonException extends AbstractThrowableProblem {
+
+    private CommonException(StatusType status, String detail) {
+        super(null, null, status, detail, null, null, null);
+    }
+
+    public static CommonException unauthorized() {
+        return new CommonException(UNAUTHORIZED, "Unauthorised or Bad Credentials");
+    }
+
+    public static CommonException forbidden() {
+        return new CommonException(FORBIDDEN, "Forbidden");
+    }
+
+    public static CommonException headerError() {
+        return new CommonException(FORBIDDEN, "Missing Header");
+    }
+
+
+}

spring-security/getting-started/SecureApplication/src/main/java/com/reflectoring/security/exception/UserAuthenticationErrorHandler.java

@@ -0,0 +1,34 @@
+package com.reflectoring.security.exception;
+
+import com.fasterxml.jackson.databind.ObjectMapper;
+import org.springframework.security.core.AuthenticationException;
+import org.springframework.security.web.authentication.www.BasicAuthenticationEntryPoint;
+
+import javax.servlet.http.HttpServletRequest;
+import javax.servlet.http.HttpServletResponse;
+import java.io.IOException;
+import java.io.PrintWriter;
+
+public class UserAuthenticationErrorHandler extends BasicAuthenticationEntryPoint {
+    private final ObjectMapper objectMapper;
+
+    public UserAuthenticationErrorHandler() {
+        this.objectMapper = new ObjectMapper();
+    }
+
+    @Override
+    public void commence(HttpServletRequest request,
+                         HttpServletResponse response,
+                         AuthenticationException ex) throws IOException {
+        /*response.setContentType("application/json");
+        response.setStatus(HttpServletResponse.SC_UNAUTHORIZED);
+        response.getOutputStream().println(objectMapper.writeValueAsString(CommonException.unauthorized()));
+    */
+        response.setStatus(HttpServletResponse.SC_UNAUTHORIZED);
+        response.addHeader("WWW-Authenticate", "Basic realm=" + getRealmName() + "");
+
+        final PrintWriter writer = response.getWriter();
+        writer.println("HTTP Status 401 : " + ex.getMessage());
+    }
+
+}

spring-security/getting-started/SecureApplication/src/main/java/com/reflectoring/security/exception/UserForbiddenErrorHandler.java

@@ -0,0 +1,28 @@
+package com.reflectoring.security.exception;
+
+import com.fasterxml.jackson.databind.ObjectMapper;
+import org.springframework.security.access.AccessDeniedException;
+import org.springframework.security.web.access.AccessDeniedHandler;
+
+import javax.servlet.http.HttpServletRequest;
+import javax.servlet.http.HttpServletResponse;
+import java.io.IOException;
+
+public class UserForbiddenErrorHandler implements AccessDeniedHandler {
+
+    private final ObjectMapper objectMapper;
+
+    public UserForbiddenErrorHandler()
+    {
+        this.objectMapper = new ObjectMapper();
+    }
+
+    @Override
+    public void handle(HttpServletRequest request,
+                       HttpServletResponse response,
+                       AccessDeniedException ex) throws IOException {
+        response.setContentType("application/json");
+        response.setStatus(HttpServletResponse.SC_FORBIDDEN);
+        response.getOutputStream().println(objectMapper.writeValueAsString(CommonException.forbidden()));
+    }
+}

spring-security/getting-started/SecureApplication/src/main/java/com/reflectoring/security/mapper/BookMapper.java

@@ -0,0 +1,23 @@
+package com.reflectoring.security.mapper;
+
+import com.reflectoring.security.mapstruct.AuthorDto;
+import com.reflectoring.security.mapstruct.BookDto;
+import com.reflectoring.security.persistence.Author;
+import com.reflectoring.security.persistence.Book;
+import org.mapstruct.Mapper;
+
+import java.util.List;
+
+@Mapper(componentModel = "spring")
+public interface BookMapper {
+    BookDto bookToBookDto(Book book);
+
+    List<BookDto> bookToBookDto(List<Book> book);
+
+    AuthorDto authorToAuthorDto(Author author);
+
+    Book bookDtoToBook(BookDto bookDto);
+
+    Author authorDtoToAuthor(AuthorDto authorDto);
+}
+

spring-security/getting-started/SecureApplication/src/main/java/com/reflectoring/security/mapstruct/AuthorDto.java

@@ -0,0 +1,50 @@
+package com.reflectoring.security.mapstruct;
+
+import com.fasterxml.jackson.annotation.JsonProperty;
+import lombok.NoArgsConstructor;
+
+@NoArgsConstructor
+public class AuthorDto {
+
+    @JsonProperty("id")
+    private long id;
+
+    @JsonProperty("name")
+    private String name;
+
+    @JsonProperty("dob")
+    private String dob;
+
+    public long getId() {
+        return id;
+    }
+
+    public void setId(long id) {
+        this.id = id;
+    }
+
+    public String getName() {
+        return name;
+    }
+
+    public void setName(String name) {
+        this.name = name;
+    }
+
+    public String getDob() {
+        return dob;
+    }
+
+    public void setDob(String dob) {
+        this.dob = dob;
+    }
+
+    @Override
+    public String toString() {
+        return "AuthorDto{" +
+                "id=" + id +
+                ", name='" + name + '\'' +
+                ", dob='" + dob + '\'' +
+                '}';
+    }
+}

spring-security/getting-started/SecureApplication/src/main/java/com/reflectoring/security/mapstruct/BookDto.java

@@ -0,0 +1,87 @@
+package com.reflectoring.security.mapstruct;
+
+import com.fasterxml.jackson.annotation.JsonProperty;
+import lombok.NoArgsConstructor;
+
+import java.util.Set;
+
+@NoArgsConstructor
+public class BookDto {
+    @JsonProperty("bookId")
+    private long id;
+
+    @JsonProperty("bookName")
+    private String name;
+
+    @JsonProperty("publisher")
+    private String publisher;
+
+    @JsonProperty("publicationYear")
+    private String publicationYear;
+
+    @JsonProperty("genre")
+    private String genre;
+
+    @JsonProperty("authors")
+    private Set<AuthorDto> authors;
+
+    public long getId() {
+        return id;
+    }
+
+    public void setId(long id) {
+        this.id = id;
+    }
+
+    public String getName() {
+        return name;
+    }
+
+    public void setName(String name) {
+        this.name = name;
+    }
+
+    public String getPublisher() {
+        return publisher;
+    }
+
+    public void setPublisher(String publisher) {
+        this.publisher = publisher;
+    }
+
+    public String getPublicationYear() {
+        return publicationYear;
+    }
+
+    public void setPublicationYear(String publicationYear) {
+        this.publicationYear = publicationYear;
+    }
+
+    public String getGenre() {
+        return genre;
+    }
+
+    public void setGenre(String genre) {
+        this.genre = genre;
+    }
+
+    public Set<AuthorDto> getAuthors() {
+        return authors;
+    }
+
+    public void setAuthors(Set<AuthorDto> authors) {
+        this.authors = authors;
+    }
+
+    @Override
+    public String toString() {
+        return "BookDto{" +
+                "id=" + id +
+                ", name='" + name + '\'' +
+                ", publisher='" + publisher + '\'' +
+                ", publicationYear='" + publicationYear + '\'' +
+                ", genre=" + genre +
+                ", authors=" + authors +
+                '}';
+    }
+}

spring-security/getting-started/SecureApplication/src/main/java/com/reflectoring/security/model/LibraryInfo.java

@@ -0,0 +1,86 @@
+package com.reflectoring.security.model;
+
+public class LibraryInfo {
+    private String libName;
+
+    private String libAddress;
+
+    private String suburb;
+
+    private String postcode;
+
+    private String landmark;
+
+    private String phone;
+
+    private String email;
+
+    public String getLibName() {
+        return libName;
+    }
+
+    public void setLibName(String libName) {
+        this.libName = libName;
+    }
+
+    public String getLibAddress() {
+        return libAddress;
+    }
+
+    public void setLibAddress(String libAddress) {
+        this.libAddress = libAddress;
+    }
+
+    public String getSuburb() {
+        return suburb;
+    }
+
+    public void setSuburb(String suburb) {
+        this.suburb = suburb;
+    }
+
+    public String getPostcode() {
+        return postcode;
+    }
+
+    public void setPostcode(String postcode) {
+        this.postcode = postcode;
+    }
+
+    public String getLandmark() {
+        return landmark;
+    }
+
+    public void setLandmark(String landmark) {
+        this.landmark = landmark;
+    }
+
+    public String getPhone() {
+        return phone;
+    }
+
+    public void setPhone(String phone) {
+        this.phone = phone;
+    }
+
+    public String getEmail() {
+        return email;
+    }
+
+    public void setEmail(String email) {
+        this.email = email;
+    }
+
+    @java.lang.Override
+    public java.lang.String toString() {
+        return "LibraryInfo{" +
+                "libName='" + libName + '\'' +
+                ", libAddress='" + libAddress + '\'' +
+                ", suburb='" + suburb + '\'' +
+                ", postcode='" + postcode + '\'' +
+                ", landmark='" + landmark + '\'' +
+                ", phone='" + phone + '\'' +
+                ", email='" + email + '\'' +
+                '}';
+    }
+}

spring-security/getting-started/SecureApplication/src/main/java/com/reflectoring/security/persistence/Author.java

@@ -0,0 +1,61 @@
+package com.reflectoring.security.persistence;
+
+import javax.persistence.*;
+import java.io.Serializable;
+import java.util.Set;
+
+@Entity
+public class Author implements Serializable {
+
+    @Id
+    @GeneratedValue(strategy = GenerationType.AUTO)
+    private long id;
+
+    private String name;
+
+    private String dob;
+
+    @ManyToMany(mappedBy = "authors")
+    private Set<Book> books;
+
+    public long getId() {
+        return id;
+    }
+
+    public void setId(long id) {
+        this.id = id;
+    }
+
+    public String getName() {
+        return name;
+    }
+
+    public void setName(String name) {
+        this.name = name;
+    }
+
+    public Set<Book> getBooks() {
+        return books;
+    }
+
+    public void setBooks(Set<Book> books) {
+        this.books = books;
+    }
+
+    public String getDob() {
+        return dob;
+    }
+
+    public void setDob(String dob) {
+        this.dob = dob;
+    }
+
+    @Override
+    public String toString() {
+        return "Author{" +
+                "id=" + id +
+                ", name='" + name + '\'' +
+                ", dob='" + dob + '\'' +
+                '}';
+    }
+}

spring-security/getting-started/SecureApplication/src/main/java/com/reflectoring/security/persistence/Book.java

@@ -0,0 +1,86 @@
+package com.reflectoring.security.persistence;
+
+import javax.persistence.*;
+import java.io.Serializable;
+import java.util.Set;
+
+@Entity
+@Table(name = "BOOK")
+public class Book implements Serializable {
+    @Id
+    @GeneratedValue(strategy = GenerationType.AUTO)
+    private long id;
+
+    private String name;
+
+    private String publisher;
+
+    private String publicationYear;
+
+    private String genre;
+
+    @ManyToMany(cascade = CascadeType.PERSIST, fetch = FetchType.LAZY)
+    @JoinTable(name = "author_book",
+            joinColumns = @JoinColumn(name = "book_id", referencedColumnName = "id"),
+            inverseJoinColumns = @JoinColumn(name = "author_id", referencedColumnName = "id"))
+    private Set<com.reflectoring.security.persistence.Author> authors;
+
+    public long getId() {
+        return id;
+    }
+
+    public void setId(long id) {
+        this.id = id;
+    }
+
+    public String getName() {
+        return name;
+    }
+
+    public void setName(String name) {
+        this.name = name;
+    }
+
+    public Set<Author> getAuthors() {
+        return authors;
+    }
+
+    public void setAuthors(Set<com.reflectoring.security.persistence.Author> authors) {
+        this.authors = authors;
+    }
+
+    public String getPublisher() {
+        return publisher;
+    }
+
+    public void setPublisher(String publisher) {
+        this.publisher = publisher;
+    }
+
+    public String getPublicationYear() {
+        return publicationYear;
+    }
+
+    public void setPublicationYear(String publicationYear) {
+        this.publicationYear = publicationYear;
+    }
+
+    public String getGenre() {
+        return genre;
+    }
+
+    public void setGenre(String genre) {
+        this.genre = genre;
+    }
+
+    @Override
+    public String toString() {
+        return "Book{" +
+                "id=" + id +
+                ", name='" + name + '\'' +
+                ", publisher='" + publisher + '\'' +
+                ", publicationYear='" + publicationYear + '\'' +
+                ", genre=" + genre +
+                '}';
+    }
+}

spring-security/getting-started/SecureApplication/src/main/java/com/reflectoring/security/repository/AuthorRepository.java

@@ -0,0 +1,9 @@
+package com.reflectoring.security.repository;
+
+import com.reflectoring.security.persistence.Author;
+import org.springframework.data.jpa.repository.JpaRepository;
+import org.springframework.stereotype.Repository;
+
+@Repository
+public interface AuthorRepository extends JpaRepository<Author, Long> {
+}

spring-security/getting-started/SecureApplication/src/main/java/com/reflectoring/security/repository/BookRepository.java

@@ -0,0 +1,18 @@
+package com.reflectoring.security.repository;
+
+import com.reflectoring.security.persistence.Book;
+import org.springframework.data.jpa.repository.JpaRepository;
+import org.springframework.security.access.prepost.PostAuthorize;
+import org.springframework.stereotype.Repository;
+
+import java.util.List;
+
+@Repository
+public interface BookRepository extends JpaRepository<Book, Long> {
+
+
+    List<Book> findByGenre(String genre);
+
+    @PostAuthorize("returnObject.size() > 0")
+    List<Book> findAll();
+}

spring-security/getting-started/SecureApplication/src/main/java/com/reflectoring/security/repository/DatabaseComponent.java

@@ -0,0 +1,92 @@
+package com.reflectoring.security.repository;
+
+import com.reflectoring.security.persistence.Author;
+import com.reflectoring.security.persistence.Book;
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.boot.CommandLineRunner;
+import org.springframework.stereotype.Component;
+
+import java.util.Set;
+
+@Component
+public class DatabaseComponent implements CommandLineRunner {
+
+    private final BookRepository bookRepository;
+
+    @Autowired
+    public DatabaseComponent(BookRepository bookRepository) {
+        this.bookRepository = bookRepository;
+    }
+
+
+    @Override
+    public void run(String... args) throws Exception {
+
+        Book book = new Book();
+        book.setName("The Kite Runner");
+        book.setPublisher("Riverhead books");
+        book.setPublicationYear("2003");
+        book.setGenre("Fiction");
+        Author author = new Author();
+        author.setName("Khaled Hosseini");
+        author.setDob("04/03/1965");
+        book.setAuthors(Set.of(author));
+        bookRepository.save(book);
+
+        book = new Book();
+        book.setName("Exiles");
+        book.setPublisher("Pan Macmillan");
+        book.setPublicationYear("2022");
+        book.setGenre("Fiction");
+        author = new Author();
+        author.setName("Jane Harper");
+        author.setDob("01/06/1980");
+        book.setAuthors(Set.of(author));
+        bookRepository.save(book);
+
+        book = new Book();
+        book.setName("A Game of Thrones");
+        book.setPublisher("Bantam Spectra");
+        book.setPublicationYear("1996");
+        book.setGenre("Fantasy");
+        author = new Author();
+        author.setName("R.R.Martin");
+        author.setDob("20/09/1948");
+        book.setAuthors(Set.of(author));
+        bookRepository.save(book);
+
+        book = new Book();
+        book.setName("American Gods");
+        book.setPublisher("Headline");
+        book.setPublicationYear("2001");
+        book.setGenre("Fantasy");
+        author = new Author();
+        author.setName("Neil Gaiman");
+        author.setDob("10/11/1960");
+        book.setAuthors(Set.of(author));
+        bookRepository.save(book);
+
+        book = new Book();
+        book.setName("The Passenger");
+        book.setPublisher("Knopf");
+        book.setPublicationYear("2022");
+        book.setGenre("Mystery");
+        author = new Author();
+        author.setName("Cormac McCarthy");
+        author.setDob("20/07/1933");
+        book.setAuthors(Set.of(author));
+        bookRepository.save(book);
+
+        book = new Book();
+        book.setName("Gone Girl");
+        book.setPublisher("Crown Publishing Group");
+        book.setPublicationYear("2012");
+        book.setGenre("Mystery");
+        author = new Author();
+        author.setName("Gillian Flynn");
+        author.setDob("24/02/1971");
+        book.setAuthors(Set.of(author));
+        bookRepository.save(book);
+
+    }
+}

spring-security/getting-started/SecureApplication/src/main/java/com/reflectoring/security/service/BookService.java

@@ -0,0 +1,50 @@
+package com.reflectoring.security.service;
+
+import com.reflectoring.security.mapper.BookMapper;
+import com.reflectoring.security.mapstruct.BookDto;
+import com.reflectoring.security.model.LibraryInfo;
+import com.reflectoring.security.persistence.Book;
+import com.reflectoring.security.repository.BookRepository;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+import org.springframework.stereotype.Service;
+
+import java.util.List;
+
+@Service
+public class BookService {
+
+    private static final Logger log = LoggerFactory.getLogger(BookService.class);
+
+    private final BookRepository bookRepository;
+
+    private final BookMapper bookMapper;
+
+    public BookService(BookRepository bookRepository, BookMapper bookMapper) {
+        this.bookRepository = bookRepository;
+        this.bookMapper = bookMapper;
+    }
+
+    public List<BookDto> getBook(String genre) {
+        List<Book> books = bookRepository.findByGenre(genre);
+        return bookMapper.bookToBookDto(books);
+    }
+
+    public List<BookDto> getAllBooks() {
+        List<Book> books = bookRepository.findAll();
+        return bookMapper.bookToBookDto(books);
+    }
+
+    public LibraryInfo getLibraryInfo() {
+        LibraryInfo info = new LibraryInfo();
+        info.setLibName("Chatswood Library");
+        info.setLibAddress("Lower Ground, The Concourse, 409 Victoria Avenue");
+        info.setSuburb("Chatswood");
+        info.setPostcode("2067");
+        info.setLandmark("Opp Westfield Shopping Centre");
+        info.setPhone("97777900");
+        info.setEmail("library@willoughby.nsw.gov.au");
+
+        return info;
+    }
+}