Merge branch 'master' into BAEL-18235-v4

.gitignore

@@ -30,7 +30,7 @@ out/
 .DS_Store
 
 # Maven
-log/
+log/*
 target/
 
 # Gradle

algorithms-miscellaneous-3/README.md

@@ -14,4 +14,6 @@ This module contains articles about algorithms. Some classes of algorithms, e.g.
 - [A Guide to the Folding Technique in Java](https://www.baeldung.com/folding-hashing-technique)
 - [Creating a Triangle with for Loops in Java](https://www.baeldung.com/java-print-triangle)
 - [Efficient Word Frequency Calculator in Java](https://www.baeldung.com/java-word-frequency)
-- More articles: [[<-- prev]](/algorithms-miscellaneous-2) [[next -->]](/algorithms-miscellaneous-4)
+- [Interpolation Search in Java](https://www.baeldung.com/java-interpolation-search)
+- [The K-Means Clustering Algorithm in Java](https://www.baeldung.com/java-k-means-clustering-algorithm)
+- More articles: [[<-- prev]](/algorithms-miscellaneous-2) [[next -->]](/algorithms-miscellaneous-4)

algorithms-miscellaneous-3/src/main/java/com/baeldung/algorithms/breadthfirstsearch/BreadthFirstSearchAlgorithm.java

@@ -0,0 +1,54 @@
+package com.baeldung.algorithms.breadthfirstsearch;
+
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+import java.util.*;
+
+public class BreadthFirstSearchAlgorithm {
+
+    private static final Logger LOGGER = LoggerFactory.getLogger(BreadthFirstSearchAlgorithm.class);
+
+    public static <T> Optional<Tree<T>> search(T value, Tree<T> root) {
+        Queue<Tree<T>> queue = new ArrayDeque<>();
+        queue.add(root);
+
+        Tree<T> currentNode;
+        while (!queue.isEmpty()) {
+            currentNode = queue.remove();
+            LOGGER.info("Visited node with value: {}", currentNode.getValue());
+
+            if (currentNode.getValue().equals(value)) {
+                return Optional.of(currentNode);
+            } else {
+                queue.addAll(currentNode.getChildren());
+            }
+        }
+
+        return Optional.empty();
+    }
+
+    public static <T> Optional<Node<T>> search(T value, Node<T> start) {
+        Queue<Node<T>> queue = new ArrayDeque<>();
+        queue.add(start);
+
+        Node<T> currentNode;
+        Set<Node<T>> alreadyVisited = new HashSet<>();
+
+        while (!queue.isEmpty()) {
+            currentNode = queue.remove();
+            LOGGER.info("Visited node with value: {}", currentNode.getValue());
+
+            if (currentNode.getValue().equals(value)) {
+                return Optional.of(currentNode);
+            } else {
+                alreadyVisited.add(currentNode);
+                queue.addAll(currentNode.getNeighbors());
+                queue.removeAll(alreadyVisited);
+            }
+        }
+
+        return Optional.empty();
+    }
+
+}

algorithms-miscellaneous-3/src/main/java/com/baeldung/algorithms/breadthfirstsearch/Node.java

@@ -0,0 +1,31 @@
+package com.baeldung.algorithms.breadthfirstsearch;
+
+import java.util.Collections;
+import java.util.HashSet;
+import java.util.Set;
+
+public class Node<T> {
+
+    private T value;
+    private Set<Node<T>> neighbors;
+
+    public Node(T value) {
+        this.value = value;
+        this.neighbors = new HashSet<>();
+    }
+
+    public T getValue() {
+        return value;
+    }
+
+    public Set<Node<T>> getNeighbors() {
+        return Collections.unmodifiableSet(neighbors);
+    }
+
+    public void connect(Node<T> node) {
+        if (this == node) throw new IllegalArgumentException("Can't connect node to itself");
+        this.neighbors.add(node);
+        node.neighbors.add(this);
+    }
+
+}

algorithms-miscellaneous-3/src/main/java/com/baeldung/algorithms/breadthfirstsearch/Tree.java

@@ -0,0 +1,34 @@
+package com.baeldung.algorithms.breadthfirstsearch;
+
+import java.util.ArrayList;
+import java.util.Collections;
+import java.util.List;
+
+public class Tree<T> {
+
+    private T value;
+    private List<Tree<T>> children;
+
+    private Tree(T value) {
+        this.value = value;
+        this.children = new ArrayList<>();
+    }
+
+    public static <T> Tree<T> of(T value) {
+        return new Tree<>(value);
+    }
+
+    public T getValue() {
+        return value;
+    }
+
+    public List<Tree<T>> getChildren() {
+        return Collections.unmodifiableList(children);
+    }
+
+    public Tree<T> addChild(T value) {
+        Tree<T> newChild = new Tree<>(value);
+        children.add(newChild);
+        return newChild;
+    }
+}

algorithms-miscellaneous-3/src/test/java/com/baeldung/algorithms/breadthfirstsearch/BreadthFirstSearchAlgorithmUnitTest.java

@@ -0,0 +1,86 @@
+package com.baeldung.algorithms.breadthfirstsearch;
+
+import org.junit.jupiter.api.Test;
+
+import static org.assertj.core.api.Assertions.assertThat;
+
+class BreadthFirstSearchAlgorithmUnitTest {
+
+    private Tree<Integer> root;
+    private Tree<Integer> rootFirstChild;
+    private Tree<Integer> depthMostChild;
+    private Tree<Integer> rootSecondChild;
+
+    private Node<Integer> start;
+    private Node<Integer> firstNeighbor;
+    private Node<Integer> firstNeighborNeighbor;
+    private Node<Integer> secondNeighbor;
+
+    @Test
+    void givenTree_whenSearchTen_thenRoot() {
+        initTree();
+        assertThat(BreadthFirstSearchAlgorithm.search(10, root)).isPresent().contains(root);
+    }
+
+    @Test
+    void givenTree_whenSearchThree_thenDepthMostValue() {
+        initTree();
+        assertThat(BreadthFirstSearchAlgorithm.search(3, root)).isPresent().contains(depthMostChild);
+    }
+
+    @Test
+    void givenTree_whenSearchFour_thenRootSecondChild() {
+        initTree();
+        assertThat(BreadthFirstSearchAlgorithm.search(4, root)).isPresent().contains(rootSecondChild);
+    }
+
+    @Test
+    void givenTree_whenSearchFive_thenNotFound() {
+        initTree();
+        assertThat(BreadthFirstSearchAlgorithm.search(5, root)).isEmpty();
+    }
+
+    private void initTree() {
+        root = Tree.of(10);
+        rootFirstChild = root.addChild(2);
+        depthMostChild = rootFirstChild.addChild(3);
+        rootSecondChild = root.addChild(4);
+    }
+
+    @Test
+    void givenNode_whenSearchTen_thenStart() {
+        initNode();
+        assertThat(BreadthFirstSearchAlgorithm.search(10, firstNeighborNeighbor)).isPresent().contains(start);
+    }
+
+    @Test
+    void givenNode_whenSearchThree_thenNeighborNeighbor() {
+        initNode();
+        assertThat(BreadthFirstSearchAlgorithm.search(3, firstNeighborNeighbor)).isPresent().contains(firstNeighborNeighbor);
+    }
+
+    @Test
+    void givenNode_whenSearchFour_thenSecondNeighbor() {
+        initNode();
+        assertThat(BreadthFirstSearchAlgorithm.search(4, firstNeighborNeighbor)).isPresent().contains(secondNeighbor);
+    }
+
+    @Test
+    void givenNode_whenSearchFive_thenNotFound() {
+        initNode();
+        assertThat(BreadthFirstSearchAlgorithm.search(5, firstNeighborNeighbor)).isEmpty();
+    }
+
+    private void initNode() {
+        start = new Node<>(10);
+        firstNeighbor = new Node<>(2);
+        start.connect(firstNeighbor);
+
+        firstNeighborNeighbor = new Node<>(3);
+        firstNeighbor.connect(firstNeighborNeighbor);
+        firstNeighborNeighbor.connect(start);
+
+        secondNeighbor = new Node<>(4);
+        start.connect(secondNeighbor);
+    }
+}

algorithms-sorting/README.md

@@ -12,3 +12,7 @@ This module contains articles about sorting algorithms.
 - [Shell Sort in Java](https://www.baeldung.com/java-shell-sort)
 - [Counting Sort in Java](https://www.baeldung.com/java-counting-sort)
 - [Sorting Strings by Contained Numbers in Java](https://www.baeldung.com/java-sort-strings-contained-numbers)
+- [How an In-Place Sorting Algorithm Works](https://www.baeldung.com/java-in-place-sorting)
+- [Selection Sort in Java](https://www.baeldung.com/java-selection-sort)
+- [Sorting Strings by Contained Numbers in Java](https://www.baeldung.com/java-sort-strings-contained-numbers)
+- [Radix Sort in Java](https://www.baeldung.com/java-radix-sort)

animal-sniffer-mvn-plugin/pom.xml

@@ -1,7 +1,6 @@
 <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/maven-v4_0_0.xsd">
     <modelVersion>4.0.0</modelVersion>
-    <groupId>com.baeldung</groupId>
     <artifactId>animal-sniffer-mvn-plugin</artifactId>
     <version>1.0-SNAPSHOT</version>
     <name>animal-sniffer-mvn-plugin</name>

apache-avro/pom.xml

@@ -14,12 +14,6 @@
     </parent>
 
     <dependencies>
-        <dependency>
-            <groupId>junit</groupId>
-            <artifactId>junit</artifactId>
-            <version>${junit.version}</version>
-            <scope>test</scope>
-        </dependency>
         <dependency>
             <groupId>org.slf4j</groupId>
             <artifactId>slf4j-simple</artifactId>
@@ -46,15 +40,6 @@
 
     <build>
         <plugins>
-            <plugin>
-                <groupId>org.apache.maven.plugins</groupId>
-                <artifactId>maven-compiler-plugin</artifactId>
-                <version>${compiler-plugin.version}</version>
-                <configuration>
-                    <source>${java.version}</source>
-                    <target>${java.version}</target>
-                </configuration>
-            </plugin>
             <plugin>
                 <groupId>org.apache.avro</groupId>
                 <artifactId>avro-maven-plugin</artifactId>
@@ -79,8 +64,6 @@
     </build>
 
     <properties>
-        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
-        <compiler-plugin.version>3.5</compiler-plugin.version>
         <avro.version>1.8.2</avro.version>
         <slf4j.version>1.7.25</slf4j.version>
     </properties>

apache-fop/pom.xml

@@ -1,7 +1,6 @@
 <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>apache-fop</artifactId>
     <version>0.1-SNAPSHOT</version>
     <name>apache-fop</name>

apache-geode/pom.xml

@@ -19,25 +19,7 @@
             <artifactId>geode-core</artifactId>
             <version>${geode.core}</version>
         </dependency>
-        <dependency>
-            <groupId>junit</groupId>
-            <artifactId>junit</artifactId>
-            <version>${junit.version}</version>
-        </dependency>
     </dependencies>
-    
-    <build>
-        <plugins>
-            <plugin>
-                <groupId>org.apache.maven.plugins</groupId>
-                <artifactId>maven-compiler-plugin</artifactId>
-                <configuration>
-                    <source>${java.version}</source>
-                    <target>${java.version}</target>
-                </configuration>
-            </plugin>
-        </plugins>
-    </build>
 	
     <properties>
         <geode.core>1.6.0</geode.core>

apache-meecrowave/pom.xml

@@ -1,7 +1,6 @@
 <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>apache-meecrowave</artifactId>
     <version>0.0.1</version>
     <name>apache-meecrowave</name>
@@ -38,13 +37,6 @@
             <version>${meecrowave-junit.version}</version>
             <scope>test</scope>
         </dependency>
-        <!-- https://mvnrepository.com/artifact/junit/junit -->
-        <dependency>
-            <groupId>junit</groupId>
-            <artifactId>junit</artifactId>
-            <version>${junit.version}</version>
-            <scope>test</scope>
-        </dependency>
     </dependencies>
 	
     <build>

apache-olingo/olingo2/pom.xml

@@ -5,7 +5,6 @@
 	<modelVersion>4.0.0</modelVersion>
 	<groupId>org.baeldung.examples.olingo2</groupId>
 	<artifactId>olingo2</artifactId>
-	<version>0.0.1-SNAPSHOT</version>
 	<name>olingo2</name>
 	<description>Sample Olingo 2 Project</description>
 

apache-pulsar/pom.xml

@@ -24,8 +24,6 @@
     </dependencies>
 	
     <properties>
-        <maven.compiler.target>1.8</maven.compiler.target>
-        <maven.compiler.source>1.8</maven.compiler.source>
-		<pulsar-client.version>2.1.1-incubating</pulsar-client.version>
+ 		<pulsar-client.version>2.1.1-incubating</pulsar-client.version>
     </properties>
 </project>

apache-shiro/README.md

@@ -4,4 +4,6 @@ This module contains articles about Apache Shiro
 
 ### Relevant articles:
 
-- [Introduction to Apache Shiro](https://www.baeldung.com/apache-shiro)
+- [Introduction to Apache Shiro](https://www.baeldung.com/apache-shiro)
+- [Permissions-Based Access Control with Apache Shiro](https://www.baeldung.com/apache-shiro-access-control)
+

apache-solrj/pom.xml

@@ -1,7 +1,6 @@
 <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>apache-solrj</artifactId>
     <version>0.0.1-SNAPSHOT</version>
     <name>apache-solrj</name>

apache-spark/README.md

@@ -6,3 +6,5 @@ This module contains articles about Apache Spark
 
 - [Introduction to Apache Spark](https://www.baeldung.com/apache-spark)
 - [Building a Data Pipeline with Kafka, Spark Streaming and Cassandra](https://www.baeldung.com/kafka-spark-data-pipeline)
+- [Machine Learning with Spark MLlib](https://www.baeldung.com/spark-mlib-machine-learning)
+

apache-spark/pom.xml

@@ -2,7 +2,6 @@
 	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>apache-spark</artifactId>
 	<version>1.0-SNAPSHOT</version>
 	<name>apache-spark</name>
@@ -59,15 +58,6 @@
 
 	<build>
 		<plugins>
-			<plugin>
-				<groupId>org.apache.maven.plugins</groupId>
-				<artifactId>maven-compiler-plugin</artifactId>
-				<version>${maven-compiler-plugin.version}</version>
-				<configuration>
-					<source>${java.version}</source>
-					<target>${java.version}</target>
-				</configuration>
-			</plugin>
 			<plugin>
 				<artifactId>maven-assembly-plugin</artifactId>
 				<executions>
@@ -95,7 +85,6 @@
 		<org.apache.spark.spark-streaming-kafka.version>2.3.0</org.apache.spark.spark-streaming-kafka.version>
 		<com.datastax.spark.spark-cassandra-connector.version>2.3.0</com.datastax.spark.spark-cassandra-connector.version>
 		<com.datastax.spark.spark-cassandra-connector-java.version>1.5.2</com.datastax.spark.spark-cassandra-connector-java.version>
-		<maven-compiler-plugin.version>3.2</maven-compiler-plugin.version>
 	</properties>
 
 </project>

apache-velocity/pom.xml

@@ -1,7 +1,6 @@
 <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/maven-v4_0_0.xsd">
     <modelVersion>4.0.0</modelVersion>
-    <groupId>com.baeldung</groupId>
     <version>0.1-SNAPSHOT</version>
     <artifactId>apache-velocity</artifactId>
     <name>apache-velocity</name>

aws-lambda/pom.xml

@@ -2,7 +2,6 @@
 <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>aws-lambda</artifactId>
     <version>0.1.0-SNAPSHOT</version>
     <name>aws-lambda</name>
@@ -88,7 +87,6 @@
     
     <properties>
         <json-simple.version>1.1.1</json-simple.version>
-        <org.json.version>20180130</org.json.version>
         <commons-io.version>2.5</commons-io.version>
         <aws-lambda-java-events.version>1.3.0</aws-lambda-java-events.version>
         <aws-lambda-java-core.version>1.2.0</aws-lambda-java-core.version>

aws/pom.xml

@@ -1,7 +1,6 @@
 <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>aws</artifactId>
     <version>0.1.0-SNAPSHOT</version>
     <name>aws</name>

axon/pom.xml

@@ -30,7 +30,6 @@
         <dependency>
             <groupId>org.springframework.boot</groupId>
             <artifactId>spring-boot-autoconfigure</artifactId>
-            <version>${spring-boot.version}</version>
             <scope>compile</scope>
         </dependency>
 

azure/pom.xml

@@ -2,7 +2,6 @@
 <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>azure</artifactId>
     <version>0.1</version>
     <name>azure</name>

core-groovy-2/README.md

@@ -11,4 +11,5 @@ This module contains articles about core Groovy concepts
 - [Integrating Groovy into Java Applications](https://www.baeldung.com/groovy-java-applications)
 - [Concatenate Strings with Groovy](https://www.baeldung.com/groovy-concatenate-strings)
 - [Metaprogramming in Groovy](https://www.baeldung.com/groovy-metaprogramming)
-- [[<-- Prev]](/core-groovy)
+- [A Quick Guide to Working with Web Services in Groovy](https://www.baeldung.com/groovy-web-services)
+- [[<-- Prev]](/core-groovy)

core-java-modules/core-java-collections-array-list/README.md

@@ -7,4 +7,6 @@ This module contains articles about the Java ArrayList collection
 - [Guide to the Java ArrayList](http://www.baeldung.com/java-arraylist)
 - [Add Multiple Items to an Java ArrayList](http://www.baeldung.com/java-add-items-array-list)
 - [ClassCastException: Arrays$ArrayList cannot be cast to ArrayList](https://www.baeldung.com/java-classcastexception-arrays-arraylist)
-- [Multi Dimensional ArrayList in Java](https://www.baeldung.com/java-multi-dimensional-arraylist)
+- [Multi Dimensional ArrayList in Java](https://www.baeldung.com/java-multi-dimensional-arraylist)
+- [Removing an Element From an ArrayList](https://www.baeldung.com/java-arraylist-remove-element)
+

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

@@ -0,0 +1,19 @@
+=========
+
+## Core Java Concurrency Advanced Examples
+
+This module contains articles about advanced topics about multithreading with core Java.
+
+### Relevant Articles: 
+- [Semaphores in Java](https://www.baeldung.com/java-semaphore)
+- [Daemon Threads in Java](https://www.baeldung.com/java-daemon-thread)
+- [Priority-based Job Scheduling in Java](https://www.baeldung.com/java-priority-job-schedule)
+- [Brief Introduction to Java Thread.yield()](https://www.baeldung.com/java-thread-yield)
+- [Print Even and Odd Numbers Using 2 Threads](https://www.baeldung.com/java-even-odd-numbers-with-2-threads)
+- [Java CyclicBarrier vs CountDownLatch](https://www.baeldung.com/java-cyclicbarrier-countdownlatch)
+- [Guide to the Fork/Join Framework in Java](https://www.baeldung.com/java-fork-join)
+- [Guide to ThreadLocalRandom in Java](https://www.baeldung.com/java-thread-local-random)
+- [The Thread.join() Method in Java](https://www.baeldung.com/java-thread-join)
+- [Passing Parameters to Java Threads](https://www.baeldung.com/java-thread-parameters)
+
+[[<-- previous]](/core-java-modules/core-java-concurrency-advanced)[[next -->]](/core-java-modules/core-java-concurrency-advanced-3)

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

@@ -0,0 +1,59 @@
+<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-advanced-2</artifactId>
+    <version>0.1.0-SNAPSHOT</version>
+    <name>core-java-concurrency-advanced-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>
+
+    <dependencies>
+        <dependency>
+            <groupId>org.apache.commons</groupId>
+            <artifactId>commons-lang3</artifactId>
+            <version>${commons-lang3.version}</version>
+        </dependency>
+        <dependency>
+            <groupId>org.openjdk.jmh</groupId>
+            <artifactId>jmh-core</artifactId>
+            <version>${jmh-core.version}</version>
+        </dependency>
+        <dependency>
+            <groupId>org.openjdk.jmh</groupId>
+            <artifactId>jmh-generator-annprocess</artifactId>
+            <version>${jmh-generator-annprocess.version}</version>
+        </dependency>
+        
+        <dependency>
+            <groupId>org.assertj</groupId>
+            <artifactId>assertj-core</artifactId>
+            <version>${assertj.version}</version>
+            <scope>test</scope>
+        </dependency>
+    </dependencies>
+
+    <build>
+        <finalName>core-java-concurrency-advanced-2</finalName>
+        <resources>
+            <resource>
+                <directory>src/main/resources</directory>
+                <filtering>true</filtering>
+            </resource>
+        </resources>
+    </build>
+
+    <properties>
+        <jmh-core.version>1.19</jmh-core.version>
+        <jmh-generator-annprocess.version>1.19</jmh-generator-annprocess.version>
+        
+        <assertj.version>3.6.1</assertj.version>
+    </properties>
+
+</project>

core-java-modules/core-java-concurrency-advanced-2/src/main/java/com/baeldung/concurrent/cyclicbarrier/CyclicBarrierResetExample.java

@@ -4,6 +4,7 @@ import java.util.concurrent.BrokenBarrierException;
 import java.util.concurrent.CyclicBarrier;
 import java.util.concurrent.ExecutorService;
 import java.util.concurrent.Executors;
+import java.util.concurrent.TimeUnit;
 import java.util.concurrent.atomic.AtomicInteger;
 
 public class CyclicBarrierResetExample {
@@ -36,6 +37,11 @@ public class CyclicBarrierResetExample {
             });
         }
         es.shutdown();
+        try {
+            es.awaitTermination(1, TimeUnit.SECONDS);
+        } catch (InterruptedException e) {
+            e.printStackTrace();
+        }
         return updateCount.get();
     }
 

core-java-modules/core-java-concurrency-advanced-2/src/main/java/com/baeldung/concurrent/daemon/NewThread.java

@@ -0,0 +1,23 @@
+package com.baeldung.concurrent.daemon;
+
+public class NewThread extends Thread {
+    public void run() {
+    	long startTime = System.currentTimeMillis();
+        while (true) {
+            for (int i = 0; i < 10; i++) {
+                System.out.println(this.getName() + ": New Thread is running..." + i);
+                try {
+                    //Wait for one sec so it doesn't print too fast
+                    Thread.sleep(1000);
+                } catch (InterruptedException e) {
+                    e.printStackTrace();
+                }
+            }
+            // prevent the Thread to run forever. It will finish it's execution after 2 seconds
+            if (System.currentTimeMillis() - startTime > 2000) {
+            	Thread.currentThread().interrupt();
+            	break;
+            }
+        }
+    }
+}

core-java-modules/core-java-concurrency-advanced-2/src/main/java/com/baeldung/concurrent/parameters/AverageCalculator.java

@@ -1,4 +1,4 @@
-package com.baeldung.concurrent.parameter;
+package com.baeldung.concurrent.parameters;
 
 import java.util.concurrent.Callable;
 import java.util.stream.IntStream;

core-java-modules/core-java-concurrency-advanced-2/src/main/java/com/baeldung/concurrent/parameters/ParameterizedThreadExample.java

@@ -1,4 +1,4 @@
-package com.baeldung.concurrent.parameter;
+package com.baeldung.concurrent.parameters;
 
 import java.util.concurrent.Callable;
 import java.util.stream.IntStream;

core-java-modules/core-java-concurrency-advanced-2/src/test/java/com/baeldung/concurrent/parameters/ParameterizedThreadUnitTest.java

@@ -1,14 +1,13 @@
-package com.baeldung.parameters;
+package com.baeldung.concurrent.parameters;
 
-import com.baeldung.concurrent.parameter.AverageCalculator;
-import org.junit.Test;
+import static org.junit.Assert.assertEquals;
 
 import java.util.concurrent.ExecutorService;
 import java.util.concurrent.Executors;
 import java.util.concurrent.Future;
 import java.util.stream.IntStream;
 
-import static org.junit.Assert.assertEquals;
+import org.junit.Test;
 
 public class ParameterizedThreadUnitTest {
 

core-java-modules/core-java-concurrency-advanced-2/src/test/java/com/baeldung/forkjoin/Java8ForkJoinIntegrationTest.java

@@ -1,4 +1,4 @@
-package com.baeldung.java8;
+package com.baeldung.forkjoin;
 
 import static org.junit.Assert.assertEquals;
 import static org.junit.Assert.assertNotNull;

core-java-modules/core-java-concurrency-advanced-3/README.md

@@ -0,0 +1,9 @@
+=========
+
+## Core Java Concurrency Advanced Examples
+
+This module contains articles about advanced topics about multithreading with core Java.
+
+### Relevant Articles: 
+
+[[<-- previous]](/core-java-modules/core-java-concurrency-advanced-2)

core-java-modules/core-java-concurrency-advanced-3/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 http://maven.apache.org/xsd/maven-4.0.0.xsd">
+    <modelVersion>4.0.0</modelVersion>
+    <groupId>com.baeldung</groupId>
+    <artifactId>core-java-concurrency-advanced-3</artifactId>
+    <version>0.1.0-SNAPSHOT</version>
+    <name>core-java-concurrency-advanced-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>
+    </dependencies>
+
+    <build>
+        <finalName>core-java-concurrency-advanced-3</finalName>
+        <resources>
+            <resource>
+                <directory>src/main/resources</directory>
+                <filtering>true</filtering>
+            </resource>
+        </resources>
+    </build>
+
+    <properties>
+    </properties>
+
+</project>

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

@@ -1,26 +0,0 @@
-*.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-advanced/README.md

@@ -1,25 +1,16 @@
 ## Core Java Concurrency Advanced Examples
 
-This module contains articles about advanced concurrency in core Java.
+This module contains articles about advanced topics about multithreading with core Java.
 
 ### Relevant Articles: 
-- [Introduction to Thread Pools in Java](http://www.baeldung.com/thread-pool-java-and-guava)
-- [Guide to CountDownLatch in Java](http://www.baeldung.com/java-countdown-latch)
-- [Guide to java.util.concurrent.Locks](http://www.baeldung.com/java-concurrent-locks)
-- [An Introduction to ThreadLocal in Java](http://www.baeldung.com/java-threadlocal)
-- [LongAdder and LongAccumulator in Java](http://www.baeldung.com/java-longadder-and-longaccumulator)
-- [The Dining Philosophers Problem in Java](http://www.baeldung.com/java-dining-philoshophers)
-- [Guide to the Java Phaser](http://www.baeldung.com/java-phaser)
-- [An Introduction to Atomic Variables in Java](http://www.baeldung.com/java-atomic-variables)
-- [CyclicBarrier in Java](http://www.baeldung.com/java-cyclic-barrier)
-- [Guide to the Volatile Keyword in Java](http://www.baeldung.com/java-volatile)
-- [Semaphores in Java](http://www.baeldung.com/java-semaphore)
-- [Daemon Threads in Java](http://www.baeldung.com/java-daemon-thread)
-- [Priority-based Job Scheduling in Java](http://www.baeldung.com/java-priority-job-schedule)
-- [Brief Introduction to Java Thread.yield()](https://www.baeldung.com/java-thread-yield)
-- [Print Even and Odd Numbers Using 2 Threads](https://www.baeldung.com/java-even-odd-numbers-with-2-threads)
-- [Java CyclicBarrier vs CountDownLatch](https://www.baeldung.com/java-cyclicbarrier-countdownlatch)
-- [Guide to the Fork/Join Framework in Java](http://www.baeldung.com/java-fork-join)
-- [Guide to ThreadLocalRandom in Java](http://www.baeldung.com/java-thread-local-random)
-- [The Thread.join() Method in Java](http://www.baeldung.com/java-thread-join)
-- [Passing Parameters to Java Threads](https://www.baeldung.com/java-thread-parameters)
+- [Introduction to Thread Pools in Java](https://www.baeldung.com/thread-pool-java-and-guava)
+- [Guide to CountDownLatch in Java](https://www.baeldung.com/java-countdown-latch)
+- [Guide to java.util.concurrent.Locks](https://www.baeldung.com/java-concurrent-locks)
+- [An Introduction to ThreadLocal in Java](https://www.baeldung.com/java-threadlocal)
+- [LongAdder and LongAccumulator in Java](https://www.baeldung.com/java-longadder-and-longaccumulator)
+- [The Dining Philosophers Problem in Java](https://www.baeldung.com/java-dining-philoshophers)
+- [Guide to the Java Phaser](https://www.baeldung.com/java-phaser)
+- [An Introduction to Atomic Variables in Java](https://www.baeldung.com/java-atomic-variables)
+- [CyclicBarrier in Java](https://www.baeldung.com/java-cyclic-barrier)
+- [Guide to the Volatile Keyword in Java](https://www.baeldung.com/java-volatile)
+- More Articles: [[next -->]](/core-java-modules/core-java-concurrency-advanced-2)

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

@@ -47,16 +47,6 @@
             <version>${avaitility.version}</version>
             <scope>test</scope>
         </dependency>
-        <dependency>
-            <groupId>org.openjdk.jmh</groupId>
-            <artifactId>jmh-core</artifactId>
-            <version>${jmh-core.version}</version>
-        </dependency>
-        <dependency>
-            <groupId>org.openjdk.jmh</groupId>
-            <artifactId>jmh-generator-annprocess</artifactId>
-            <version>${jmh-generator-annprocess.version}</version>
-        </dependency>
     </dependencies>
 
     <build>
@@ -78,8 +68,6 @@
         <!-- testing -->
         <assertj.version>3.6.1</assertj.version>
         <avaitility.version>1.7.0</avaitility.version>
-        <jmh-core.version>1.19</jmh-core.version>
-        <jmh-generator-annprocess.version>1.19</jmh-generator-annprocess.version>
     </properties>
 
 </project>

core-java-modules/core-java-concurrency-advanced/src/main/java/com/baeldung/concurrent/cyclicbarrier/CyclicBarrierCompletionMethodExample.java

@@ -4,6 +4,7 @@ import java.util.concurrent.BrokenBarrierException;
 import java.util.concurrent.CyclicBarrier;
 import java.util.concurrent.ExecutorService;
 import java.util.concurrent.Executors;
+import java.util.concurrent.TimeUnit;
 import java.util.concurrent.atomic.AtomicInteger;
 
 public class CyclicBarrierCompletionMethodExample {
@@ -35,6 +36,11 @@ public class CyclicBarrierCompletionMethodExample {
             });
         }
         es.shutdown();
+        try {
+            es.awaitTermination(1, TimeUnit.SECONDS);
+        } catch (InterruptedException e) {
+            e.printStackTrace();
+        }
         return updateCount.get();
     }
 

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

@@ -11,3 +11,5 @@ This module contains articles about core java exceptions
 - [Difference Between Throw and Throws in Java](https://www.baeldung.com/java-throw-throws)
 - [“Sneaky Throws” in Java](https://www.baeldung.com/java-sneaky-throws)
 - [The StackOverflowError in Java](https://www.baeldung.com/java-stack-overflow-error)
+- [Checked and Unchecked Exceptions in Java](https://www.baeldung.com/java-checked-unchecked-exceptions)
+

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

@@ -0,0 +1,6 @@
+
+### Relevant Articles:
+
+- [Create a File in a Specific Directory in Java](https://www.baeldung.com/java-create-file-in-directory)
+- [A Guide to the Java FileReader Class](https://www.baeldung.com/java-filereader)
+

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

@@ -41,4 +41,5 @@ This module contains articles about core Java input and output (IO)
 - [List Files in a Directory in Java](https://www.baeldung.com/java-list-directory-files)
 - [Java InputStream to Byte Array and ByteBuffer](https://www.baeldung.com/convert-input-stream-to-array-of-bytes)
 - [Introduction to the Java NIO Selector](https://www.baeldung.com/java-nio-selector)
+- [How to Avoid the Java FileNotFoundException When Loading Resources](https://www.baeldung.com/java-classpath-resource-cannot-be-opened)
 - [[More -->]](/core-java-modules/core-java-io-2)

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

@@ -0,0 +1,4 @@
+
+### Relevant Articles:
+
+- [Java Naming and Directory Interface Overview](https://www.baeldung.com/jndi)

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

@@ -4,3 +4,5 @@
 
 ### Relevant Articles: 
 - [Method Inlining in the JVM](https://www.baeldung.com/jvm-method-inlining)
+- [A Guide to System.exit()](https://www.baeldung.com/java-system-exit)
+- [Guide to System.gc()](https://www.baeldung.com/java-system-gc)

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

@@ -4,4 +4,5 @@ This module contains articles about core features in the Java language
 
 ### Relevant Articles: 
 - [Java Primitives versus Objects](https://www.baeldung.com/java-primitives-vs-objects)
-- [[<-- Prev]](/core-java-modules/core-java-lang)
+- [Command-Line Arguments in Java](https://www.baeldung.com/java-command-line-arguments)
+- [[<-- Prev]](/core-java-modules/core-java-lang)

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

@@ -14,4 +14,5 @@ This module contains articles about Object-oriented programming (OOP) in Java
 - [A Guide to Constructors in Java](https://www.baeldung.com/java-constructors)
 - [Composition, Aggregation, and Association in Java](https://www.baeldung.com/java-composition-aggregation-association)
 - [Static and Default Methods in Interfaces in Java](https://www.baeldung.com/java-static-default-methods)
-- [[<-- Prev]](/core-java-modules/core-java-lang-oop)[[More -->]](/core-java-modules/core-java-lang-oop-3)
+- [Java Copy Constructor](https://www.baeldung.com/java-copy-constructor)
+- [[<-- Prev]](/core-java-modules/core-java-lang-oop)[[More -->]](/core-java-modules/core-java-lang-oop-3)

core-java-modules/core-java-lang-oop/src/test/java/com/baeldung/deepcopy/DeepCopyUnitTest.java

@@ -25,7 +25,7 @@ public class DeepCopyUnitTest {
     }
 
     @Test
-    public void whenModifyingOriginalObject_thenConstructorCopyShouldNotChange() {
+    public void whenModifyingOriginalObject_thenCopyShouldNotChange() {
         Address address = new Address("Downing St 10", "London", "England");
         User pm = new User("Prime", "Minister", address);
         User deepCopy = new User(pm);
@@ -125,4 +125,13 @@ public class DeepCopyUnitTest {
         end = System.currentTimeMillis();
         System.out.println("Cloning with Jackson took " + (end - start) + " milliseconds.");
     }
+    
+    @Test
+    public void whenModifyingOriginalObject_ThenCopyShouldChange() {
+        Address address = new Address("Downing St 10", "London", "England");
+        User pm = new User("Prime", "Minister", address);
+        User shallowCopy = new User(pm.getFirstName(), pm.getLastName(), pm.getAddress());
+        address.setCountry("Great Britain");
+        assertThat(shallowCopy.getAddress().getCountry()).isEqualTo(pm.getAddress().getCountry());
+    }
 }

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

@@ -5,3 +5,5 @@
 - [Java instanceof Operator](https://www.baeldung.com/java-instanceof)
 - [A Guide to Increment and Decrement Unary Operators in Java](https://www.baeldung.com/java-unary-operators)
 - [Java Compound Operators](https://www.baeldung.com/java-compound-operators)
+- [The XOR Operator in Java](https://www.baeldung.com/java-xor-operator)
+

core-java-modules/core-java-lang-syntax/src/main/java/com/baeldung/generics/Generics.java

@@ -35,4 +35,11 @@ public class Generics {
         return list;
     }
 
+    public <T> List<T> genericMethod(List<T> list) {
+        return list.stream().collect(Collectors.toList());
+    }
+    
+    public List<Object> withErasure(List<Object> list) {
+        return list.stream().collect(Collectors.toList());
+    }
 }

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

@@ -5,3 +5,4 @@ This module contains articles about core Java non-blocking input and output (IO)
 ## Relevant Articles:
 
 - [Determine File Creation Date in Java](https://www.baeldung.com/java-file-creation-date)
+- [Find the Number of Lines in a File Using Jav](https://www.baeldung.com/java-file-number-of-lines)

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

@@ -14,3 +14,5 @@ This module contains articles about core Java Security
 - [Enabling TLS v1.2 in Java 7](https://www.baeldung.com/java-7-tls-v12)
 - [The Java SecureRandom Class](https://www.baeldung.com/java-secure-random)
 - [An Introduction to Java SASL](https://www.baeldung.com/java-sasl)
+- [A Guide to Java GSS API](https://www.baeldung.com/java-gss)
+

core-java-modules/core-java-string-conversions-2/README.md

@@ -0,0 +1,9 @@
+## Java String Conversions
+
+This module contains articles about string conversions from/to another type.
+
+### Relevant Articles:
+- [Java String Conversions](https://www.baeldung.com/java-string-conversions)
+- [Convert String to Byte Array and Reverse in Java](https://www.baeldung.com/java-string-to-byte-array)
+- [Convert Char Array to String](https://www.baeldung.com/java-char-array-to-string)
+- More articles: [[<-- prev]](/core-java-string-conversions)

core-java-modules/core-java-string-conversions-2/pom.xml

@@ -0,0 +1,47 @@
+<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>
+    <artifactId>core-java-string-conversions-2</artifactId>
+    <version>0.1.0-SNAPSHOT</version>
+    <packaging>jar</packaging>
+    <name>core-java-string-conversions-2</name>
+
+    <parent>
+        <groupId>com.baeldung</groupId>
+        <artifactId>parent-java</artifactId>
+        <version>0.0.1-SNAPSHOT</version>
+        <relativePath>../../parent-java</relativePath>
+    </parent>
+
+    <dependencies>
+        <dependency>
+            <groupId>com.google.guava</groupId>
+            <artifactId>guava</artifactId>
+            <version>${guava.version}</version>
+        </dependency>
+        <dependency>
+            <groupId>junit</groupId>
+            <artifactId>junit</artifactId>
+            <version>${junit.version}</version>
+            <scope>test</scope>
+        </dependency>
+        <dependency>
+            <groupId>org.hamcrest</groupId>
+            <artifactId>hamcrest-library</artifactId>
+            <version>${org.hamcrest.version}</version>
+            <scope>test</scope>
+        </dependency>
+    </dependencies>
+
+    <build>
+        <finalName>core-java-string-conversions-2</finalName>
+        <resources>
+            <resource>
+                <directory>src/main/resources</directory>
+                <filtering>true</filtering>
+            </resource>
+        </resources>
+
+    </build>
+
+</project>

core-java-modules/core-java-string-conversions-2/src/main/java/com/baeldung/stringconversions/UseLocalDateTime.java

@@ -1,4 +1,4 @@
-package com.baeldung.datetime;
+package com.baeldung.stringconversions;
 
 import java.time.LocalDateTime;
 

core-java-modules/core-java-string-conversions-2/src/test/java/com/baeldung/chararraytostring/CharArrayToStringConversionUnitTest.java

@@ -1,4 +1,4 @@
-package com.baeldung.string.charArrayToString;
+package com.baeldung.chararraytostring;
 
 import static org.hamcrest.Matchers.is;
 import static org.junit.Assert.assertThat;

core-java-modules/core-java-string-conversions-2/src/test/java/com/baeldung/stringconversions/StringConversionUnitTest.java

@@ -1,4 +1,4 @@
-package com.baeldung.java.conversion;
+package com.baeldung.stringconversions;
 
 import static org.junit.Assert.assertEquals;
 
@@ -13,8 +13,6 @@ import java.util.GregorianCalendar;
 
 import org.junit.Test;
 
-import com.baeldung.datetime.UseLocalDateTime;
-
 public class StringConversionUnitTest {
 
     @Test

core-java-modules/core-java-string-conversions-2/src/test/java/com/baeldung/stringtobytearray/ByteArrayToStringUnitTest.java

@@ -1,4 +1,4 @@
-package com.baeldung.string.conversion;
+package com.baeldung.stringtobytearray;
 
 import static org.junit.jupiter.api.Assertions.assertEquals;
 import static org.junit.jupiter.api.Assertions.assertNotNull;

core-java-modules/core-java-string-conversions-2/src/test/java/com/baeldung/stringtobytearray/StringToByteArrayUnitTest.java

@@ -1,4 +1,4 @@
-package com.baeldung.string.conversion;
+package com.baeldung.stringtobytearray;
 
 import static org.junit.jupiter.api.Assertions.assertArrayEquals;
 import static org.junit.jupiter.api.Assertions.assertNotNull;

core-java-modules/core-java-string-conversions/README.md

@@ -0,0 +1,16 @@
+## Java String Conversions
+
+This module contains articles about string conversions from/to another type.
+
+### Relevant Articles:
+- [Converting String to Stream of chars](https://www.baeldung.com/java-string-to-stream)
+- [Converting Strings to Enums in Java](https://www.baeldung.com/java-string-to-enum)
+- [Convert a String to Title Case](https://www.baeldung.com/java-string-title-case)
+- [Convert java.util.Date to String](https://www.baeldung.com/java-util-date-to-string)
+- [Converting a Stack Trace to a String in Java](https://www.baeldung.com/java-stacktrace-to-string)
+- [Image to Base64 String Conversion](https://www.baeldung.com/java-base64-image-string)
+- [Convert a Comma Separated String to a List in Java](https://www.baeldung.com/java-string-with-separator-to-list)
+- [Converting Java String to Double](https://www.baeldung.com/java-string-to-double)
+- [Convert Char to String in Java](https://www.baeldung.com/java-convert-char-to-string)
+- [Convert String to int or Integer in Java](https://www.baeldung.com/java-convert-string-to-int-or-integer)
+- More articles: [[next -->]](/core-java-string-conversions-2)

core-java-modules/core-java-string-conversions/pom.xml

@@ -0,0 +1,67 @@
+<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>
+    <artifactId>core-java-string-conversions</artifactId>
+    <version>0.1.0-SNAPSHOT</version>
+    <packaging>jar</packaging>
+    <name>core-java-string-conversions</name>
+
+    <parent>
+        <groupId>com.baeldung</groupId>
+        <artifactId>parent-java</artifactId>
+        <version>0.0.1-SNAPSHOT</version>
+        <relativePath>../../parent-java</relativePath>
+    </parent>
+
+    <dependencies>
+        <dependency>
+            <groupId>com.ibm.icu</groupId>
+            <artifactId>icu4j</artifactId>
+            <version>${icu4j.version}</version>
+        </dependency>
+        <dependency>
+            <groupId>commons-io</groupId>
+            <artifactId>commons-io</artifactId>
+            <version>${commons-io.version}</version>
+        </dependency>
+        <dependency>
+            <groupId>org.apache.commons</groupId>
+            <artifactId>commons-lang3</artifactId>
+            <version>${commons-lang3.version}</version>
+        </dependency>
+        <dependency>
+            <groupId>com.google.guava</groupId>
+            <artifactId>guava</artifactId>
+            <version>${guava.version}</version>
+        </dependency>
+        <!-- test scoped -->
+        <dependency>
+            <groupId>org.assertj</groupId>
+            <artifactId>assertj-core</artifactId>
+            <version>${assertj.version}</version>
+            <scope>test</scope>
+        </dependency>
+        <dependency>
+            <groupId>org.hamcrest</groupId>
+            <artifactId>hamcrest-library</artifactId>
+            <version>${org.hamcrest.version}</version>
+            <scope>test</scope>
+        </dependency>
+    </dependencies>
+
+    <build>
+        <finalName>core-java-string-conversions</finalName>
+        <resources>
+            <resource>
+                <directory>src/main/resources</directory>
+                <filtering>true</filtering>
+            </resource>
+        </resources>
+    </build>
+
+    <properties>
+        <icu4j.version>61.1</icu4j.version>
+        <assertj.version>3.6.1</assertj.version>
+    </properties>
+
+</project>

core-java-modules/core-java-string-conversions/src/main/java/com/baeldung/stringtoenum/PizzaStatusEnum.java

@@ -1,4 +1,4 @@
-package com.baeldung.enums;
+package com.baeldung.stringtoenum;
 
 public enum PizzaStatusEnum {
     ORDERED(5) {

core-java-modules/core-java-string-conversions/src/main/java/com/baeldung/titlecase/TitleCaseConverter.java

@@ -1,12 +1,11 @@
-package com.baeldung.string;
-
-import java.util.Arrays;
-import java.util.stream.Collectors;
-
-import org.apache.commons.lang3.text.WordUtils;
+package com.baeldung.titlecase;
 
 import com.ibm.icu.lang.UCharacter;
 import com.ibm.icu.text.BreakIterator;
+import org.apache.commons.lang3.text.WordUtils;
+
+import java.util.Arrays;
+import java.util.stream.Collectors;
 
 public class TitleCaseConverter {
 

core-java-modules/core-java-string-conversions/src/test/java/com/baeldung/chartostring/CharToStringUnitTest.java

@@ -1,4 +1,4 @@
-package com.baeldung;
+package com.baeldung.chartostring;
 
 import org.junit.Test;
 

core-java-modules/core-java-string-conversions/src/test/java/com/baeldung/datetostring/DateToStringFormatterUnitTest.java

@@ -1,6 +1,7 @@
-package com.baeldung.string.formatter;
+package com.baeldung.datetostring;
 
-import static org.junit.Assert.assertEquals;
+import org.junit.BeforeClass;
+import org.junit.Test;
 
 import java.text.DateFormat;
 import java.text.SimpleDateFormat;
@@ -13,8 +14,7 @@ import java.util.Date;
 import java.util.Locale;
 import java.util.TimeZone;
 
-import org.junit.BeforeClass;
-import org.junit.Test;
+import static org.junit.Assert.assertEquals;
 
 public class DateToStringFormatterUnitTest {
 

core-java-modules/core-java-string-conversions/src/test/java/com/baeldung/filetobase64conversion/FileToBase64StringConversionUnitTest.java

@@ -1,13 +1,13 @@
-package com.baeldung.fileToBase64StringConversion;
+package com.baeldung.filetobase64conversion;
 
-import static org.junit.Assert.assertTrue;
+import org.apache.commons.io.FileUtils;
+import org.junit.Test;
 
 import java.io.File;
 import java.io.IOException;
 import java.util.Base64;
 
-import org.apache.commons.io.FileUtils;
-import org.junit.Test;
+import static org.junit.Assert.assertTrue;
 
 public class FileToBase64StringConversionUnitTest {
 

core-java-modules/core-java-string-conversions/src/test/java/com/baeldung/stringtodouble/StringToDoubleConversionUnitTest.java

@@ -1,4 +1,4 @@
-package com.baeldung.string.todouble;
+package com.baeldung.stringtodouble;
 
 import static org.junit.Assert.assertEquals;
 

core-java-modules/core-java-string-conversions/src/test/java/com/baeldung/stringtoenum/StringToEnumUnitTest.java

@@ -1,10 +1,10 @@
-package com.baeldung.enums;
+package com.baeldung.stringtoenum;
 
 import static junit.framework.TestCase.assertTrue;
 
 import org.junit.Test;
 
-public class PizzaUnitTest {
+public class StringToEnumUnitTest {
     
     @Test
     public void whenConvertedIntoEnum_thenGetsConvertedCorrectly() {

core-java-modules/core-java-string-conversions/src/test/java/com/baeldung/stringtoint/StringToIntOrIntegerUnitTest.java

@@ -1,4 +1,4 @@
-package com.baeldung;
+package com.baeldung.stringtoint;
 
 import static org.assertj.core.api.Assertions.assertThat;
 

core-java-modules/core-java-string-conversions/src/test/java/com/baeldung/stringtolist/ConvertStringToListUnitTest.java

@@ -1,135 +1,134 @@
-package com.baeldung;
-
-import static org.junit.Assert.assertEquals;
-
-import java.util.ArrayList;
-import java.util.Arrays;
-import java.util.List;
-import java.util.stream.Collectors;
-import java.util.stream.Stream;
-
-import org.apache.commons.lang3.StringUtils;
-import org.junit.Test;
-
-import com.google.common.base.Function;
-import com.google.common.base.Splitter;
-import com.google.common.collect.Lists;
-
-public class ConvertStringToListUnitTest {
-
-    private final String countries = "Russia,Germany,England,France,Italy";
-    private final String ranks = "1,2,3,4,5, 6,7";
-    private final String emptyStrings = ",,,,,";
-    private final List<String> expectedCountriesList = Arrays.asList("Russia", "Germany", "England", "France", "Italy");
-    private final List<Integer> expectedRanksList = Arrays.asList(1, 2, 3, 4, 5, 6, 7);
-    private final List<String> expectedEmptyStringsList = Arrays.asList("", "", "", "", "", "");
-
-    @Test
-    public void givenString_thenGetListOfStringByJava() {
-        List<String> convertedCountriesList = Arrays.asList(countries.split(",", -1));
-
-        assertEquals(expectedCountriesList, convertedCountriesList);
-    }
-
-    @Test
-    public void givenString_thenGetListOfStringByApache() {
-        List<String> convertedCountriesList = Arrays.asList(StringUtils.splitPreserveAllTokens(countries, ","));
-
-        assertEquals(expectedCountriesList, convertedCountriesList);
-    }
-
-    @Test
-    public void givenString_thenGetListOfStringByGuava() {
-        List<String> convertedCountriesList = Splitter.on(",")
-            .trimResults()
-            .splitToList(countries);
-
-        assertEquals(expectedCountriesList, convertedCountriesList);
-    }
-
-    @Test
-    public void givenString_thenGetListOfStringByJava8() {
-        List<String> convertedCountriesList = Stream.of(countries.split(",", -1))
-            .collect(Collectors.toList());
-
-        assertEquals(expectedCountriesList, convertedCountriesList);
-    }
-
-    @Test
-    public void givenString_thenGetListOfIntegerByJava() {
-        String[] convertedRankArray = ranks.split(",");
-        List<Integer> convertedRankList = new ArrayList<Integer>();
-        for (String number : convertedRankArray) {
-            convertedRankList.add(Integer.parseInt(number.trim()));
-        }
-
-        assertEquals(expectedRanksList, convertedRankList);
-    }
-
-    @Test
-    public void givenString_thenGetListOfIntegerByGuava() {
-        List<Integer> convertedRankList = Lists.transform(Splitter.on(",")
-            .trimResults()
-            .splitToList(ranks), new Function<String, Integer>() {
-                @Override
-                public Integer apply(String input) {
-                    return Integer.parseInt(input.trim());
-                }
-            });
-
-        assertEquals(expectedRanksList, convertedRankList);
-    }
-
-    @Test
-    public void givenString_thenGetListOfIntegerByJava8() {
-        List<Integer> convertedRankList = Stream.of(ranks.split(","))
-            .map(String::trim)
-            .map(Integer::parseInt)
-            .collect(Collectors.toList());
-
-        assertEquals(expectedRanksList, convertedRankList);
-    }
-
-    @Test
-    public void givenString_thenGetListOfIntegerByApache() {
-        String[] convertedRankArray = StringUtils.split(ranks, ",");
-        List<Integer> convertedRankList = new ArrayList<Integer>();
-        for (String number : convertedRankArray) {
-            convertedRankList.add(Integer.parseInt(number.trim()));
-        }
-
-        assertEquals(expectedRanksList, convertedRankList);
-    }
-
-    @Test
-    public void givenEmptyStrings_thenGetListOfStringByJava() {
-        List<String> convertedEmptyStringsList = Arrays.asList(emptyStrings.split(",", -1));
-
-        assertEquals(expectedEmptyStringsList, convertedEmptyStringsList);
-    }
-
-    @Test
-    public void givenEmptyStrings_thenGetListOfStringByApache() {
-        List<String> convertedEmptyStringsList = Arrays.asList(StringUtils.splitPreserveAllTokens(emptyStrings, ","));
-
-        assertEquals(expectedEmptyStringsList, convertedEmptyStringsList);
-    }
-
-    @Test
-    public void givenEmptyStrings_thenGetListOfStringByGuava() {
-        List<String> convertedEmptyStringsList = Splitter.on(",")
-            .trimResults()
-            .splitToList(emptyStrings);
-
-        assertEquals(expectedEmptyStringsList, convertedEmptyStringsList);
-    }
-
-    @Test
-    public void givenEmptyStrings_thenGetListOfStringByJava8() {
-        List<String> convertedEmptyStringsList = Stream.of(emptyStrings.split(",", -1))
-            .collect(Collectors.toList());
-
-        assertEquals(expectedEmptyStringsList, convertedEmptyStringsList);
-    }
-
-}
+package com.baeldung.stringtolist;
+
+import com.google.common.base.Function;
+import com.google.common.base.Splitter;
+import com.google.common.collect.Lists;
+import org.apache.commons.lang3.StringUtils;
+import org.junit.Test;
+
+import java.util.ArrayList;
+import java.util.Arrays;
+import java.util.List;
+import java.util.stream.Collectors;
+import java.util.stream.Stream;
+
+import static org.junit.Assert.assertEquals;
+
+public class ConvertStringToListUnitTest {
+
+    private final String countries = "Russia,Germany,England,France,Italy";
+    private final String ranks = "1,2,3,4,5, 6,7";
+    private final String emptyStrings = ",,,,,";
+    private final List<String> expectedCountriesList = Arrays.asList("Russia", "Germany", "England", "France", "Italy");
+    private final List<Integer> expectedRanksList = Arrays.asList(1, 2, 3, 4, 5, 6, 7);
+    private final List<String> expectedEmptyStringsList = Arrays.asList("", "", "", "", "", "");
+
+    @Test
+    public void givenString_thenGetListOfStringByJava() {
+        List<String> convertedCountriesList = Arrays.asList(countries.split(",", -1));
+
+        assertEquals(expectedCountriesList, convertedCountriesList);
+    }
+
+    @Test
+    public void givenString_thenGetListOfStringByApache() {
+        List<String> convertedCountriesList = Arrays.asList(StringUtils.splitPreserveAllTokens(countries, ","));
+
+        assertEquals(expectedCountriesList, convertedCountriesList);
+    }
+
+    @Test
+    public void givenString_thenGetListOfStringByGuava() {
+        List<String> convertedCountriesList = Splitter.on(",")
+            .trimResults()
+            .splitToList(countries);
+
+        assertEquals(expectedCountriesList, convertedCountriesList);
+    }
+
+    @Test
+    public void givenString_thenGetListOfStringByJava8() {
+        List<String> convertedCountriesList = Stream.of(countries.split(",", -1))
+            .collect(Collectors.toList());
+
+        assertEquals(expectedCountriesList, convertedCountriesList);
+    }
+
+    @Test
+    public void givenString_thenGetListOfIntegerByJava() {
+        String[] convertedRankArray = ranks.split(",");
+        List<Integer> convertedRankList = new ArrayList<Integer>();
+        for (String number : convertedRankArray) {
+            convertedRankList.add(Integer.parseInt(number.trim()));
+        }
+
+        assertEquals(expectedRanksList, convertedRankList);
+    }
+
+    @Test
+    public void givenString_thenGetListOfIntegerByGuava() {
+        List<Integer> convertedRankList = Lists.transform(Splitter.on(",")
+            .trimResults()
+            .splitToList(ranks), new Function<String, Integer>() {
+                @Override
+                public Integer apply(String input) {
+                    return Integer.parseInt(input.trim());
+                }
+            });
+
+        assertEquals(expectedRanksList, convertedRankList);
+    }
+
+    @Test
+    public void givenString_thenGetListOfIntegerByJava8() {
+        List<Integer> convertedRankList = Stream.of(ranks.split(","))
+            .map(String::trim)
+            .map(Integer::parseInt)
+            .collect(Collectors.toList());
+
+        assertEquals(expectedRanksList, convertedRankList);
+    }
+
+    @Test
+    public void givenString_thenGetListOfIntegerByApache() {
+        String[] convertedRankArray = StringUtils.split(ranks, ",");
+        List<Integer> convertedRankList = new ArrayList<Integer>();
+        for (String number : convertedRankArray) {
+            convertedRankList.add(Integer.parseInt(number.trim()));
+        }
+
+        assertEquals(expectedRanksList, convertedRankList);
+    }
+
+    @Test
+    public void givenEmptyStrings_thenGetListOfStringByJava() {
+        List<String> convertedEmptyStringsList = Arrays.asList(emptyStrings.split(",", -1));
+
+        assertEquals(expectedEmptyStringsList, convertedEmptyStringsList);
+    }
+
+    @Test
+    public void givenEmptyStrings_thenGetListOfStringByApache() {
+        List<String> convertedEmptyStringsList = Arrays.asList(StringUtils.splitPreserveAllTokens(emptyStrings, ","));
+
+        assertEquals(expectedEmptyStringsList, convertedEmptyStringsList);
+    }
+
+    @Test
+    public void givenEmptyStrings_thenGetListOfStringByGuava() {
+        List<String> convertedEmptyStringsList = Splitter.on(",")
+            .trimResults()
+            .splitToList(emptyStrings);
+
+        assertEquals(expectedEmptyStringsList, convertedEmptyStringsList);
+    }
+
+    @Test
+    public void givenEmptyStrings_thenGetListOfStringByJava8() {
+        List<String> convertedEmptyStringsList = Stream.of(emptyStrings.split(",", -1))
+            .collect(Collectors.toList());
+
+        assertEquals(expectedEmptyStringsList, convertedEmptyStringsList);
+    }
+
+}

core-java-modules/core-java-string-conversions/src/test/java/com/baeldung/stringtostream/StringToCharStreamUnitTest.java

@@ -1,4 +1,4 @@
-package com.baeldung.string;
+package com.baeldung.stringtostream;
 
 import org.junit.Test;
 

core-java-modules/core-java-string-conversions/src/test/java/com/baeldung/titlecase/TitleCaseConverterUnitTest.java

@@ -1,4 +1,4 @@
-package com.baeldung.string;
+package com.baeldung.titlecase;
 
 import org.junit.Assert;
 import org.junit.Test;

core-kotlin/src/main/kotlin/com/baeldung/builder/FoodOrder.kt

@@ -1,6 +1,6 @@
 package com.baeldung.builder
 
-class FoodOrder(
+class FoodOrder private constructor(
   val bread: String?,
   val condiments: String?,
   val meat: String?,

httpclient-simple/src/test/java/com/baeldung/client/RestClientLiveManualTest.java

@@ -6,9 +6,9 @@ import static org.junit.Assert.assertThat;
 
 import java.io.IOException;
 import java.security.GeneralSecurityException;
-import java.security.cert.X509Certificate;
 
 import javax.net.ssl.SSLContext;
+import javax.net.ssl.SSLPeerUnverifiedException;
 
 import org.apache.http.HttpResponse;
 import org.apache.http.client.ClientProtocolException;
@@ -46,7 +46,7 @@ public class RestClientLiveManualTest {
     // old httpClient will throw UnsupportedOperationException
     @Ignore
     @Test
-    public final void givenAcceptingAllCertificates_whenHttpsUrlIsConsumed_thenOk_1() throws GeneralSecurityException {
+    public final void givenAcceptingAllCertificates_whenHttpsUrlIsConsumed_thenOk() throws GeneralSecurityException {
         final HttpComponentsClientHttpRequestFactory requestFactory = new HttpComponentsClientHttpRequestFactory();
         final CloseableHttpClient httpClient = (CloseableHttpClient) requestFactory.getHttpClient();
 
@@ -92,7 +92,7 @@ public class RestClientLiveManualTest {
     }
 
     @Test
-    public final void givenAcceptingAllCertificatesUsing4_4_whenHttpsUrlIsConsumedUsingRestTemplate_thenCorrect() throws ClientProtocolException, IOException {
+    public final void givenAcceptingAllCertificatesUsing4_4_whenUsingRestTemplate_thenCorrect() throws ClientProtocolException, IOException {
         final CloseableHttpClient httpClient = HttpClients.custom().setSSLHostnameVerifier(new NoopHostnameVerifier()).build();
         final HttpComponentsClientHttpRequestFactory requestFactory = new HttpComponentsClientHttpRequestFactory();
         requestFactory.setHttpClient(httpClient);
@@ -101,4 +101,12 @@ public class RestClientLiveManualTest {
         assertThat(response.getStatusCode().value(), equalTo(200));
     }
 
+    @Test(expected = SSLPeerUnverifiedException.class)
+    public void whenHttpsUrlIsConsumed_thenException() throws ClientProtocolException, IOException {
+        CloseableHttpClient httpClient = HttpClients.createDefault();
+        String urlOverHttps = "https://localhost:8082/httpclient-simple";
+        HttpGet getMethod = new HttpGet(urlOverHttps);
+        HttpResponse response = httpClient.execute(getMethod);
+        assertThat(response.getStatusLine().getStatusCode(), equalTo(200));
+    }
 }