Merge branch 'master' into core-java-move-1

core-java-modules/core-java-collections-list-2/src/test/java/com/baeldung/java/listInitialization/ListInitializationUnitTest.java

@@ -42,7 +42,7 @@ public class ListInitializationUnitTest {
     }
 
     @Test
-    public void givenArrayAsList_whenCreated_thenShareReference() {
+    public void givenArraysAsList_whenCreated_thenShareReference() {
         String[] array = { "foo", "bar" };
         List<String> list = Arrays.asList(array);
         array[0] = "baz";

core-java-modules/core-java-concurrency-2/.gitignore

@@ -0,0 +1,26 @@
+*.class
+
+0.*
+
+#folders#
+/target
+/neoDb*
+/data
+/src/main/webapp/WEB-INF/classes
+*/META-INF/*
+.resourceCache
+
+# Packaged files #
+*.jar
+*.war
+*.ear
+
+# Files generated by integration tests
+*.txt
+backup-pom.xml
+/bin/
+/temp
+
+#IntelliJ specific
+.idea/
+*.iml

core-java-modules/core-java-concurrency-2/README.md

@@ -0,0 +1,7 @@
+=========
+
+## Core Java Concurrency 2 Examples
+
+### Relevant Articles: 
+- [Using a Mutex Object in Java](https://www.baeldung.com/java-mutex)
+

core-java-modules/core-java-concurrency-2/pom.xml

@@ -0,0 +1,27 @@
+<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>com.baeldung</groupId>
+    <artifactId>core-java-concurrency-2</artifactId>
+    <version>0.1.0-SNAPSHOT</version>
+    <name>core-java-concurrency-2</name>
+    <packaging>jar</packaging>
+
+    <parent>
+        <groupId>com.baeldung</groupId>
+        <artifactId>parent-java</artifactId>
+        <version>0.0.1-SNAPSHOT</version>
+        <relativePath>../../parent-java</relativePath>
+    </parent>
+
+    <build>
+        <finalName>core-java-concurrency-2</finalName>
+        <resources>
+            <resource>
+                <directory>src/main/resources</directory>
+                <filtering>true</filtering>
+            </resource>
+        </resources>
+    </build>
+
+</project>

core-java-modules/core-java-concurrency-2/src/main/resources/logback.xml

@@ -0,0 +1,19 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<configuration>
+    <appender name="STDOUT" class="ch.qos.logback.core.ConsoleAppender">
+        <encoder>
+            <pattern>%d{HH:mm:ss.SSS} [%thread] %-5level %logger{36} - %msg%n
+            </pattern>
+        </encoder>
+    </appender>
+
+    <logger name="org.springframework" level="WARN" />
+    <logger name="org.springframework.transaction" level="WARN" />
+
+    <!-- in order to debug some marshalling issues, this needs to be TRACE -->
+    <logger name="org.springframework.web.servlet.mvc" level="WARN" />
+
+    <root level="INFO">
+        <appender-ref ref="STDOUT" />
+    </root>
+</configuration>

core-java-modules/core-java-concurrency-2/src/test/resources/.gitignore

@@ -0,0 +1,13 @@
+*.class
+
+#folders#
+/target
+/neoDb*
+/data
+/src/main/webapp/WEB-INF/classes
+*/META-INF/*
+
+# Packaged files #
+*.jar
+*.war
+*.ear

core-java-modules/core-java-io/src/test/java/com/baeldung/readfile/FileOperationsManualTest.java

@@ -1,4 +1,4 @@
-package com.baeldung.file;
+package com.baeldung.readfile;
 
 import org.apache.commons.io.FileUtils;
 import org.apache.commons.io.IOUtils;

core-java-modules/core-java-jvm/src/main/java/com/baeldung/systemgc/DemoApplication.java

@@ -0,0 +1,33 @@
+package com.baeldung.systemgc;
+
+import java.util.HashMap;
+import java.util.Map;
+import java.util.Scanner;
+
+import static java.util.UUID.randomUUID;
+
+public class DemoApplication {
+
+    private static final Map<String, String> cache = new HashMap<String, String>();
+
+    public static void main(String[] args) {
+        Scanner scanner = new Scanner(System.in);
+
+        while (scanner.hasNext()) {
+            final String next = scanner.next();
+            if ("fill".equals(next)) {
+                for (int i = 0; i < 1000000; i++) {
+                    cache.put(randomUUID().toString(), randomUUID().toString());
+                }
+            } else if ("invalidate".equals(next)) {
+                cache.clear();
+            } else if ("gc".equals(next)) {
+                System.gc();
+            } else if ("exit".equals(next)) {
+                System.exit(0);
+            } else {
+                System.out.println("unknown");
+            }
+        }
+    }
+}

core-java-modules/core-java-lang-oop-2/README.md

@@ -7,3 +7,9 @@
 - [Cannot Reference “X” Before Supertype Constructor Has Been Called](https://www.baeldung.com/java-cannot-reference-x-before-supertype-constructor-error)
 - [Anonymous Classes in Java](https://www.baeldung.com/java-anonymous-classes)
 - [Raw Types in Java](https://www.baeldung.com/raw-types-java)
+- [Java ‘private’ Access Modifier](https://www.baeldung.com/java-private-keyword)
+- [Marker Interfaces in Java](https://www.baeldung.com/java-marker-interfaces)
+- [Java equals() and hashCode() Contracts](https://www.baeldung.com/java-equals-hashcode-contracts)
+- [Immutable Objects in Java](http://www.baeldung.com/java-immutable-object)
+- [Inheritance and Composition (Is-a vs Has-a relationship) in Java](http://www.baeldung.com/java-inheritance-composition)
+- [A Guide to Constructors in Java](https://www.baeldung.com/java-constructors)

core-java-modules/core-java-lang-oop-2/pom.xml

@@ -15,16 +15,26 @@
     </parent>
 
 	<dependencies>
-		<dependency>
-			<groupId>com.h2database</groupId>
-			<artifactId>h2</artifactId>
-			<version>${h2.version}</version>
-			<scope>test</scope>
-		</dependency>
+        <!-- test scoped -->
+        <dependency>
+            <groupId>org.assertj</groupId>
+            <artifactId>assertj-core</artifactId>
+            <version>${assertj-core.version}</version>
+            <scope>test</scope>
+        </dependency>
+        <dependency>
+            <groupId>nl.jqno.equalsverifier</groupId>
+            <artifactId>equalsverifier</artifactId>
+            <version>${equalsverifier.version}</version>
+            <scope>test</scope>
+        </dependency>
 	</dependencies>
 
     <properties>
         <h2.version>1.4.199</h2.version>
+        <!-- testing -->
+        <assertj-core.version>3.10.0</assertj-core.version>
+        <equalsverifier.version>3.0.3</equalsverifier.version>
     </properties>
     
     <build>

core-java-modules/core-java-lang-oop-2/src/main/java/com/baeldung/basicmethods/PersonName.java

@@ -0,0 +1,37 @@
+package com.baeldung.basicmethods;
+
+import java.io.FileWriter;
+import java.io.IOException;
+import java.io.PrintWriter;
+
+public class PersonName {
+
+    public String getName(String firstName, String lastName) throws RuntimeException {
+        return firstName + " " + lastName;
+    }
+
+    public String getName(String firstName, String middleName, String lastName) {
+        if (!middleName.equals("")) {
+            return firstName + " " + lastName;
+        }
+        return firstName + " " + middleName + " " + lastName;
+    }
+
+    public void printFullName(String firstName, String lastName) {
+        System.out.println(firstName + " " + lastName);
+    }
+
+    public void writeName(String name) throws IOException {
+        PrintWriter out = new PrintWriter(new FileWriter("OutFile.txt"));
+        out.println("Name: " + name);
+        out.close();
+    }
+
+    public static String getNameStatic(String firstName, String lastName) {
+        return firstName + " " + lastName;
+    }
+
+    public static void callToStaticMethod() {
+        System.out.println("Name is: " + PersonName.getNameStatic("Alan", "Turing"));
+    }
+}

core-java-modules/core-java-lang-oop-2/src/main/java/com/baeldung/inheritancecomposition/application/Application.java

@@ -1,12 +1,6 @@
 package com.baeldung.inheritancecomposition.application;
 
-import com.baeldung.inheritancecomposition.model.Actress;
-import com.baeldung.inheritancecomposition.model.Computer;
-import com.baeldung.inheritancecomposition.model.StandardMemory;
-import com.baeldung.inheritancecomposition.model.Person;
-import com.baeldung.inheritancecomposition.model.StandardProcessor;
-import com.baeldung.inheritancecomposition.model.StandardSoundCard;
-import com.baeldung.inheritancecomposition.model.Waitress;
+import com.baeldung.inheritancecomposition.model.*;
 
 public class Application {
     

core-java-modules/core-java-lang-oop-2/src/test/java/com/baeldung/constructors/ConstructorUnitTest.java

@@ -1,11 +1,9 @@
 package com.baeldung.constructors;
 
-import com.google.common.collect.Comparators;
 import org.junit.Test;
 
 import java.time.LocalDateTime;
 import java.time.Month;
-import java.util.ArrayList;
 import java.util.logging.Logger;
 
 import static org.assertj.core.api.Assertions.*;

core-java-modules/core-java-lang-oop-2/src/test/java/com/baeldung/equalshashcode/MoneyUnitTest.java

@@ -1,10 +1,10 @@
 package com.baeldung.equalshashcode;
 
-import static org.junit.Assert.assertTrue;
-import static org.junit.Assert.assertFalse;
-
 import org.junit.Test;
 
+import static org.junit.Assert.assertFalse;
+import static org.junit.Assert.assertTrue;
+
 public class MoneyUnitTest {
 
     @Test

core-java-modules/core-java-lang-oop-2/src/test/java/com/baeldung/equalshashcode/TeamUnitTest.java

@@ -1,14 +1,13 @@
 package com.baeldung.equalshashcode;
 
-import static org.junit.Assert.assertEquals;
-import static org.junit.Assert.assertFalse;
+import nl.jqno.equalsverifier.EqualsVerifier;
+import org.junit.Test;
 
 import java.util.HashMap;
 import java.util.Map;
 
-import org.junit.Test;
-
-import nl.jqno.equalsverifier.EqualsVerifier;
+import static org.junit.Assert.assertEquals;
+import static org.junit.Assert.assertFalse;
 
 public class TeamUnitTest {
 

core-java-modules/core-java-lang-oop-2/src/test/java/com/baeldung/equalshashcode/entities/ComplexClassUnitTest.java

@@ -1,13 +1,11 @@
 package com.baeldung.equalshashcode.entities;
 
-import java.util.ArrayList;
-import java.util.HashSet;
-import java.util.List;
-
 import org.junit.Assert;
 import org.junit.Test;
 
-import com.baeldung.equalshashcode.entities.ComplexClass;
+import java.util.ArrayList;
+import java.util.HashSet;
+import java.util.List;
 
 public class ComplexClassUnitTest {
 

core-java-modules/core-java-lang-oop-2/src/test/java/com/baeldung/equalshashcode/entities/SquareClassUnitTest.java

@@ -1,11 +1,9 @@
 package com.baeldung.equalshashcode.entities;
 
-import java.awt.Color;
-
 import org.junit.Assert;
 import org.junit.Test;
 
-import com.baeldung.equalshashcode.entities.Square;
+import java.awt.*;
 
 public class SquareClassUnitTest {
 

core-java-modules/core-java-lang-oop-2/src/test/java/com/baeldung/immutableobjects/ImmutableObjectsUnitTest.java

@@ -1,11 +1,11 @@
 package com.baeldung.immutableobjects;
 
-import static org.junit.Assert.assertEquals;
+import org.junit.Test;
 
 import java.util.ArrayList;
 import java.util.List;
 
-import org.junit.Test;
+import static org.junit.Assert.assertEquals;
 
 public class ImmutableObjectsUnitTest {
 

core-java-modules/core-java-lang-oop-2/src/test/java/com/baeldung/inheritancecomposition/ActressUnitTest.java

@@ -1,8 +1,9 @@
-package com.baeldung.inheritancecomposition.test;
+package com.baeldung.inheritancecomposition;
 
 import com.baeldung.inheritancecomposition.model.Actress;
 import org.junit.BeforeClass;
 import org.junit.Test;
+
 import static org.assertj.core.api.Assertions.*;
 
 public class ActressUnitTest {

core-java-modules/core-java-lang-oop-2/src/test/java/com/baeldung/inheritancecomposition/CompositionUnitTest.java

@@ -1,15 +1,12 @@
-package com.baeldung.inheritancecomposition.test;
+package com.baeldung.inheritancecomposition;
 
-import com.baeldung.inheritancecomposition.model.Computer;
-import com.baeldung.inheritancecomposition.model.Memory;
-import com.baeldung.inheritancecomposition.model.Processor;
-import com.baeldung.inheritancecomposition.model.StandardMemory;
-import com.baeldung.inheritancecomposition.model.StandardProcessor;
-import com.baeldung.inheritancecomposition.model.StandardSoundCard;
-import java.util.Optional;
-import static org.assertj.core.api.Assertions.assertThat;
+import com.baeldung.inheritancecomposition.model.*;
 import org.junit.Test;
 
+import java.util.Optional;
+
+import static org.assertj.core.api.Assertions.assertThat;
+
 public class CompositionUnitTest {
     
     

core-java-modules/core-java-lang-oop-2/src/test/java/com/baeldung/inheritancecomposition/InheritanceUnitTest.java

@@ -1,11 +1,12 @@
-package com.baeldung.inheritancecomposition.test;
+package com.baeldung.inheritancecomposition;
 
 import com.baeldung.inheritancecomposition.model.Actress;
 import com.baeldung.inheritancecomposition.model.Person;
 import com.baeldung.inheritancecomposition.model.Waitress;
-import static org.assertj.core.api.Assertions.assertThat;
 import org.junit.Test;
 
+import static org.assertj.core.api.Assertions.assertThat;
+
 public class InheritanceUnitTest {
     
     @Test

core-java-modules/core-java-lang-oop-2/src/test/java/com/baeldung/inheritancecomposition/PersonUnitTest.java

@@ -1,8 +1,9 @@
-package com.baeldung.inheritancecomposition.test;
+package com.baeldung.inheritancecomposition;
 
 import com.baeldung.inheritancecomposition.model.Person;
 import org.junit.BeforeClass;
 import org.junit.Test;
+
 import static org.assertj.core.api.Assertions.*;
 
 public class PersonUnitTest {

core-java-modules/core-java-lang-oop-2/src/test/java/com/baeldung/inheritancecomposition/WaitressUnitTest.java

@@ -1,8 +1,9 @@
-package com.baeldung.inheritancecomposition.test;
+package com.baeldung.inheritancecomposition;
 
 import com.baeldung.inheritancecomposition.model.Waitress;
 import org.junit.BeforeClass;
 import org.junit.Test;
+
 import static org.assertj.core.api.Assertions.*;
 
 public class WaitressUnitTest {

core-java-modules/core-java-lang-oop-2/src/test/java/com/baeldung/markerinterface/MarkerInterfaceUnitTest.java

@@ -1,9 +1,9 @@
 package com.baeldung.markerinterface;
 
-import static org.junit.jupiter.api.Assertions.assertEquals;
-
 import org.junit.jupiter.api.Test;
 
+import static org.junit.jupiter.api.Assertions.assertEquals;
+
 public class MarkerInterfaceUnitTest {
 
     @Test

core-java-modules/core-java-lang-oop-3/.gitignore

@@ -0,0 +1,26 @@
+*.class
+
+0.*
+
+#folders#
+/target
+/neoDb*
+/data
+/src/main/webapp/WEB-INF/classes
+*/META-INF/*
+.resourceCache
+
+# Packaged files #
+*.jar
+*.war
+*.ear
+
+# Files generated by integration tests
+*.txt
+backup-pom.xml
+/bin/
+/temp
+
+#IntelliJ specific
+.idea/
+*.iml

core-java-modules/core-java-lang-oop-3/README.md

@@ -0,0 +1,11 @@
+=========
+
+## Core Java Lang OOP 3 Cookbooks and Examples
+
+### Relevant Articles: 
+- [Pass-By-Value as a Parameter Passing Mechanism in Java](http://www.baeldung.com/java-pass-by-value-or-pass-by-reference)
+- [Access Modifiers in Java](http://www.baeldung.com/java-access-modifiers)
+- [Guide to the super Java Keyword](http://www.baeldung.com/java-super)
+- [Guide to the this Java Keyword](http://www.baeldung.com/java-this)
+- [Java Public Access Modifier](https://www.baeldung.com/java-public-keyword)
+- [Composition, Aggregation and Association in Java](https://www.baeldung.com/java-composition-aggregation-association)

core-java-modules/core-java-lang-oop-3/pom.xml

@@ -0,0 +1,26 @@
+<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>com.baeldung</groupId>
+    <artifactId>core-java-lang-oop-3</artifactId>
+    <version>0.1.0-SNAPSHOT</version>
+    <name>core-java-lang-oop-3</name>
+    <packaging>jar</packaging>
+
+    <parent>
+        <groupId>com.baeldung</groupId>
+        <artifactId>parent-java</artifactId>
+        <version>0.0.1-SNAPSHOT</version>
+        <relativePath>../../parent-java</relativePath>
+    </parent>
+
+    <dependencies>
+        <dependency>
+            <groupId>com.h2database</groupId>
+            <artifactId>h2</artifactId>
+            <version>${h2.version}</version>
+            <scope>test</scope>
+        </dependency>
+    </dependencies>
+
+</project>

core-java-modules/core-java-lang-oop-3/src/test/java/com/baeldung/accessmodifiers/PublicAccessModifierUnitTest.java

@@ -1,14 +1,11 @@
 package com.baeldung.accessmodifiers;
 
+import com.baeldung.accessmodifiers.publicmodifier.ListOfThree;
+import com.baeldung.accessmodifiers.publicmodifier.Student;
 import org.junit.jupiter.api.Test;
 import org.junit.jupiter.api.TestInstance;
 import org.junit.jupiter.api.TestInstance.Lifecycle;
-import com.baeldung.accessmodifiers.publicmodifier.ListOfThree;
-import com.baeldung.accessmodifiers.publicmodifier.Student;
 
-import static org.junit.Assert.assertNotNull;
-import static org.junit.Assert.assertTrue;
-import static org.junit.jupiter.api.Assertions.assertEquals;
 import java.math.BigDecimal;
 import java.sql.Connection;
 import java.sql.DriverManager;
@@ -17,6 +14,10 @@ import java.util.HashMap;
 import java.util.List;
 import java.util.Map;
 
+import static org.junit.Assert.assertNotNull;
+import static org.junit.Assert.assertTrue;
+import static org.junit.jupiter.api.Assertions.assertEquals;
+
 @TestInstance(Lifecycle.PER_CLASS)
 public class PublicAccessModifierUnitTest {
 

core-java-modules/core-java-lang-oop-3/src/test/java/com/baeldung/parameterpassing/NonPrimitivesUnitTest.java

@@ -27,7 +27,7 @@ public class NonPrimitivesUnitTest {
         b1.num++;
     }
 }
- 
+
 class Foo {
     public int num;
    

core-java-modules/core-java-lang-oop/README.md

@@ -12,13 +12,4 @@
 - [Object Type Casting in Java](http://www.baeldung.com/java-type-casting)
 - [The “final” Keyword in Java](http://www.baeldung.com/java-final)
 - [Type Erasure in Java Explained](http://www.baeldung.com/java-type-erasure)
-- [Pass-By-Value as a Parameter Passing Mechanism in Java](http://www.baeldung.com/java-pass-by-value-or-pass-by-reference)
 - [Variable and Method Hiding in Java](http://www.baeldung.com/java-variable-method-hiding)
-- [Access Modifiers in Java](http://www.baeldung.com/java-access-modifiers)
-- [Guide to the super Java Keyword](http://www.baeldung.com/java-super)
-- [Guide to the this Java Keyword](http://www.baeldung.com/java-this)
-- [Immutable Objects in Java](http://www.baeldung.com/java-immutable-object)
-- [Inheritance and Composition (Is-a vs Has-a relationship) in Java](http://www.baeldung.com/java-inheritance-composition)
-- [A Guide to Constructors in Java](https://www.baeldung.com/java-constructors)
-- [Java equals() and hashCode() Contracts](https://www.baeldung.com/java-equals-hashcode-contracts)
-- [Marker Interfaces in Java](https://www.baeldung.com/java-marker-interfaces)

core-java-modules/core-java-lang-oop/pom.xml

@@ -56,12 +56,6 @@
             <version>${assertj-core.version}</version>
             <scope>test</scope>
         </dependency>
-        <dependency>
-            <groupId>nl.jqno.equalsverifier</groupId>
-            <artifactId>equalsverifier</artifactId>
-            <version>${equalsverifier.version}</version>
-            <scope>test</scope>
-        </dependency>
     </dependencies>
 
     <build>
@@ -78,7 +72,6 @@
         <gson.version>2.8.2</gson.version>
         <!-- testing -->
         <assertj-core.version>3.10.0</assertj-core.version>
-        <equalsverifier.version>3.0.3</equalsverifier.version>
     </properties>
 
 </project>

core-java-modules/core-java-networking-2/README.md

@@ -3,3 +3,5 @@
 - [Checking if a URL Exists in Java](https://www.baeldung.com/java-check-url-exists)
 - [Making a JSON POST Request With HttpURLConnection](https://www.baeldung.com/httpurlconnection-post)
 - [Using Curl in Java](https://www.baeldung.com/java-curl)
+- [Do a Simple HTTP Request in Java](http://www.baeldung.com/java-http-request)
+- [Sending Emails with Java](http://www.baeldung.com/java-email)

core-java-modules/core-java-networking-2/pom.xml

@@ -12,9 +12,23 @@
     </parent>
 
     <dependencies>
+        <dependency>
+            <groupId>org.apache.commons</groupId>
+            <artifactId>commons-lang3</artifactId>
+            <version>${commons-lang3.version}</version>
+        </dependency>
+        <dependency>
+            <groupId>javax.mail</groupId>
+            <artifactId>mail</artifactId>
+            <version>${javax.mail.version}</version>
+        </dependency>
     </dependencies>
 
     <build>
         <finalName>core-java-networking-2</finalName>
-    </build>	
+    </build>
+
+    <properties>
+        <javax.mail.version>1.5.0-b01</javax.mail.version>
+    </properties>
 </project>

core-java-modules/core-java-networking-2/src/main/java/com/baeldung/mail/EmailService.java

@@ -1,15 +1,12 @@
 package com.baeldung.mail;
 
-import org.slf4j.Logger;
-import org.slf4j.LoggerFactory;
-
-import java.io.File;
-import java.util.Properties;
 import javax.mail.*;
 import javax.mail.internet.InternetAddress;
 import javax.mail.internet.MimeBodyPart;
 import javax.mail.internet.MimeMessage;
 import javax.mail.internet.MimeMultipart;
+import java.io.File;
+import java.util.Properties;
 
 public class EmailService {
 

core-java-modules/core-java-networking-2/src/test/java/com/baeldung/httprequest/HttpRequestLiveTest.java

@@ -3,14 +3,7 @@ package com.baeldung.httprequest;
 import org.apache.commons.lang3.StringUtils;
 import org.junit.Test;
 
-import com.baeldung.httprequest.FullResponseBuilder;
-import com.baeldung.httprequest.ParameterStringBuilder;
-
-import java.io.BufferedReader;
-import java.io.DataOutputStream;
-import java.io.IOException;
-import java.io.InputStreamReader;
-import java.io.Reader;
+import java.io.*;
 import java.net.CookieManager;
 import java.net.HttpCookie;
 import java.net.HttpURLConnection;

core-java-modules/core-java-networking/README.md

@@ -7,12 +7,10 @@
 - [Connecting Through Proxy Servers in Core Java](https://www.baeldung.com/java-connect-via-proxy-server)
 - [Broadcasting and Multicasting in Java](http://www.baeldung.com/java-broadcast-multicast)
 - [A Guide To UDP In Java](http://www.baeldung.com/udp-in-java)
-- [Sending Emails with Java](http://www.baeldung.com/java-email)
 - [A Guide To HTTP Cookies In Java](http://www.baeldung.com/cookies-java)
 - [A Guide to the Java URL](http://www.baeldung.com/java-url)
 - [Working with Network Interfaces in Java](http://www.baeldung.com/java-network-interfaces)
 - [A Guide to Java Sockets](http://www.baeldung.com/a-guide-to-java-sockets)
 - [Guide to Java URL Encoding/Decoding](http://www.baeldung.com/java-url-encoding-decoding)
-- [Do a Simple HTTP Request in Java](http://www.baeldung.com/java-http-request)
 - [Difference between URL and URI](http://www.baeldung.com/java-url-vs-uri)
 - [Read an InputStream using the Java Server Socket](https://www.baeldung.com/java-inputstream-server-socket)

core-java-modules/core-java-networking/pom.xml

@@ -14,11 +14,6 @@
     </parent>
 
     <dependencies>
-        <dependency>
-            <groupId>javax.mail</groupId>
-            <artifactId>mail</artifactId>
-            <version>${javax.mail.version}</version>
-        </dependency>
         <dependency>
             <groupId>commons-io</groupId>
             <artifactId>commons-io</artifactId>
@@ -29,11 +24,6 @@
             <artifactId>spring-web</artifactId>
             <version>${springframework.spring-web.version}</version>
         </dependency>
-        <dependency>
-            <groupId>org.apache.commons</groupId>
-            <artifactId>commons-lang3</artifactId>
-            <version>${commons-lang3.version}</version>
-        </dependency>
     </dependencies>
 
     <build>
@@ -41,7 +31,6 @@
     </build>
 
     <properties>
-        <javax.mail.version>1.5.0-b01</javax.mail.version>
         <springframework.spring-web.version>4.3.4.RELEASE</springframework.spring-web.version>
     </properties>	
 </project>

core-java-modules/core-java/src/main/java/com/baeldung/jsonposturlconnection/PostJSONWithHttpURLConnection.java

@@ -0,0 +1,46 @@
+package com.baeldung.jsonposturlconnection;
+
+import java.io.BufferedReader;
+import java.io.IOException;
+import java.io.InputStreamReader;
+import java.io.OutputStream;
+import java.net.HttpURLConnection;
+import java.net.URL;
+
+public class PostJSONWithHttpURLConnection {
+	
+	public static void main (String []args) throws IOException{
+		//Change the URL with any other publicly accessible POST resource, which accepts JSON request body
+		URL url = new URL ("https://reqres.in/api/users");
+		
+		HttpURLConnection con = (HttpURLConnection)url.openConnection();
+		con.setRequestMethod("POST");
+		
+		con.setRequestProperty("Content-Type", "application/json; utf-8");
+		con.setRequestProperty("Accept", "application/json");
+		
+		con.setDoOutput(true);
+		
+		//JSON String need to be constructed for the specific resource. 
+		//We may construct complex JSON using any third-party JSON libraries such as jackson or org.json
+		String jsonInputString = "{\"name\": \"Upendra\", \"job\": \"Programmer\"}";
+		
+		try(OutputStream os = con.getOutputStream()){
+			byte[] input = jsonInputString.getBytes("utf-8");
+			os.write(input, 0, input.length);			
+		}
+
+		int code = con.getResponseCode();
+		System.out.println(code);
+		
+		try(BufferedReader br = new BufferedReader(new InputStreamReader(con.getInputStream(), "utf-8"))){
+			StringBuilder response = new StringBuilder();
+			String responseLine = null;
+			while ((responseLine = br.readLine()) != null) {
+				response.append(responseLine.trim());
+			}
+			System.out.println(response.toString());
+		}
+	}
+
+}