Merge https://github.com/eugenp/tutorials

.gitignore

@@ -73,8 +73,6 @@ ninja/devDb.mv.db
 **/out-tsc
 **/nbproject/
 **/nb-configuration.xml
-core-scala/.cache-main
-core-scala/.cache-tests
 
 
 persistence-modules/hibernate5/transaction.log

README.md

@@ -22,10 +22,38 @@ This project is **a collection of small and focused tutorials** - each covering
 A strong focus of these is, of course, the Spring Framework - Spring, Spring Boot and Spring Security. 
 In additional to Spring, the modules here are covering a number of aspects in Java. 
 
+Profile based segregation
+====================
+
+We are using maven build profiles to segregate the huge list of individual projects we have in our repository.
+
+The projects are broadly divided into 3 list: first, second and heavy. 
+
+Next, they are segregated further on the basis of tests that we want to execute.
+
+Therefore, we have a total of 6 profiles:
+
+| Profile                 | Includes                    | Type of test enabled |
+| ----------------------- | --------------------------- | -------------------- |
+| default-first           | First set of projects       | *UnitTest            |
+| integration-lite-first  | First set of projects       | *IntegrationTest     |
+| default-second          | Second set of projects      | *UnitTest            |
+| integration-lite-second | Second set of projects      | *IntegrationTest     |
+| default-heavy           | Heavy/long running projects | *UnitTest            |
+| integration-heavy       | Heavy/long running projects | *IntegrationTest     |
 
 Building the project
 ====================
-To do the full build, do: `mvn clean install`
+
+Though it should not be needed often to build the entire repository at once because we are usually concerned with a specific module.
+
+But if we want to, we can invoke the below command from the root of the repository if we want to build the entire repository with only Unit Tests enabled:
+
+`mvn clean install -Pdefault-first,default-second,default-heavy`
+
+or if we want to build the entire repository with Integration Tests enabled, we can do:
+
+`mvn clean install -Pintegration-lite-first,integration-lite-second,integration-heavy`
 
 
 Building a single module
@@ -46,8 +74,18 @@ When you're working with an individual module, there's no need to import all of
 
 Running Tests
 =============
-The command `mvn clean install` will run the unit tests in a module.
-To run the integration tests, use the command `mvn clean install -Pintegration-lite-first`
+The command `mvn clean install` from within a module will run the unit tests in that module.
+For Spring modules this will also run the `SpringContextTest` if present.
+
+To run the integration tests, use the command:
+
+`mvn clean install -Pintegration-lite-first` or 
+
+`mvn clean install -Pintegration-lite-second` or 
+
+`mvn clean install -Pintegration-heavy`
+
+depending on the list where our module exists
 
 
 

algorithms-miscellaneous-5/pom.xml

@@ -41,11 +41,6 @@
             <artifactId>guava</artifactId>
             <version>${guava.version}</version>
         </dependency>
-        <dependency>
-            <groupId>com.fasterxml.jackson.core</groupId>
-            <artifactId>jackson-databind</artifactId>
-            <version>${jackson.version}</version>
-        </dependency>
         <dependency>
             <groupId>org.junit.platform</groupId>
             <artifactId>junit-platform-commons</artifactId>
@@ -78,7 +73,6 @@
         <commons-codec.version>1.11</commons-codec.version>
         <commons-math3.version>3.6.1</commons-math3.version>
         <guava.version>28.1-jre</guava.version>
-        <jackson.version>2.10.2</jackson.version>
         <junit.platform.version>1.6.0</junit.platform.version>
     </properties>
 

algorithms-miscellaneous-5/src/main/java/com/baeldung/algorithms/boruvka/BoruvkaMST.java

@@ -1,61 +0,0 @@
-package com.baeldung.algorithms.boruvka;
-
-public class BoruvkaMST {
-
-    private static Tree mst = new Tree();
-    private static int totalWeight;
-
-    public BoruvkaMST(Graph graph) {
-        DisjointSet dSet = new DisjointSet(graph.getNodes());
-
-        // repeat at most log N times or until we have N-1 edges
-        for (int t = 1; t < graph.getNodes() && mst.getEdgeCount() < graph.getNodes() - 1; t = t + t) {
-
-            // foreach tree in forest, find closest edge
-            Edge[] closestEdgeArray = new Edge[graph.getNodes()];
-            for (Edge edge : graph.getAllEdges()) {
-                int first = edge.getFirst();
-                int second = edge.getSecond();
-                int firstParent = dSet.getParent(first);
-                int secondParent = dSet.getParent(second);
-                if (firstParent == secondParent) {
-                    continue; // same tree
-                }
-                if (closestEdgeArray[firstParent] == null || edge.getWeight() < closestEdgeArray[firstParent].getWeight()) {
-                    closestEdgeArray[firstParent] = edge;
-                }
-                if (closestEdgeArray[secondParent] == null || edge.getWeight() < closestEdgeArray[secondParent].getWeight()) {
-                    closestEdgeArray[secondParent] = edge;
-                }
-            }
-
-            // add newly discovered edges to MST
-            for (int i = 0; i < graph.getNodes(); i++) {
-                Edge edge = closestEdgeArray[i];
-                if (edge != null) {
-                    int first = edge.getFirst();
-                    int second = edge.getSecond();
-                    // don't add the same edge twice
-                    if (dSet.getParent(first) != dSet.getParent(second)) {
-                        mst.addEdge(edge);
-                        totalWeight += edge.getWeight();
-                        dSet.union(first, second);
-                    }
-                }
-            }
-        }
-    }
-
-    public Iterable<Edge> getMST() {
-        return mst;
-    }
-
-    public int getTotalWeight() {
-        return totalWeight;
-    }
-
-    public String toString() {
-        return "MST: " + mst.toString() + " | Total Weight: " + totalWeight;
-    }
-
-}

algorithms-miscellaneous-5/src/main/java/com/baeldung/algorithms/boruvka/DisjointSet.java

@@ -1,49 +0,0 @@
-package com.baeldung.algorithms.boruvka;
-
-import java.util.Arrays;
-
-public class DisjointSet {
-
-    private int[] nodeParents;
-    private int[] nodeRanks;
-
-    public DisjointSet(int n) {
-        nodeParents = new int[n];
-        nodeRanks = new int[n];
-        for (int i = 0; i < n; i++) {
-            nodeParents[i] = i;
-            nodeRanks[i] = 0;
-        }
-    }
-
-    public int getParent(int node) {
-        while (node != nodeParents[node]) {
-            node = nodeParents[node];
-        }
-        return node;
-    }
-
-    public void union(int node1, int node2) {
-        int node1Parent = getParent(node1);
-        int node2Parent = getParent(node2);
-        if (node1Parent == node2Parent) {
-            return;
-        }
-
-        if (nodeRanks[node1Parent] < nodeRanks[node2Parent]) {
-            nodeParents[node1Parent] = node2Parent;
-        }
-        else if (nodeRanks[node1Parent] > nodeRanks[node2Parent]) {
-            nodeParents[node2Parent] = node1Parent;
-        }
-        else {
-            nodeParents[node2Parent] = node1Parent;
-            nodeRanks[node1Parent]++;
-        }
-    }
-
-    public String toString() {
-        return "Parent: " + Arrays.toString(nodeParents) + "Rank: " + Arrays.toString(nodeRanks);
-    }
-
-}

algorithms-miscellaneous-5/src/main/java/com/baeldung/algorithms/boruvka/Edge.java

@@ -1,40 +0,0 @@
-package com.baeldung.algorithms.boruvka;
-
-public class Edge {
-
-    private final int first;
-    private final int second;
-    private final int weight;
-
-    public Edge(int first, int second, int weight) {
-        this.first = first;
-        this.second = second;
-        this.weight = weight;
-    }
-
-    public double getWeight() {
-        return weight;
-    }
-
-    public int getFirst() {
-        return first;
-    }
-    
-    public int getSecond() {
-        return second;
-    }
-
-    public int getOtherNode(int firstNode) {
-        int secondNode = 0;
-        if (firstNode == first)
-            secondNode = second;
-        else if (firstNode == second)
-            secondNode = first;
-        return secondNode;
-    }
-
-    public String toString() {
-        return String.format("%d-%d %d", first, second, weight);
-    }
-
-}

algorithms-miscellaneous-5/src/main/java/com/baeldung/algorithms/boruvka/Graph.java

@@ -1,64 +0,0 @@
-package com.baeldung.algorithms.boruvka;
-
-import java.io.IOException;
-
-import com.fasterxml.jackson.core.JsonParseException;
-import com.fasterxml.jackson.databind.JsonMappingException;
-
-public class Graph {
-
-    private int nodes;
-    private int edges;
-    private Tree[] trees;
-
-    public Graph(Input jsonGraph) throws JsonParseException, JsonMappingException, IOException {
-        nodes = jsonGraph.getNodes();
-        trees = (Tree[]) new Tree[nodes];
-        for (int i = 0; i < nodes; i++) {
-            trees[i] = new Tree();
-        }
-
-        int edgesFromInput = jsonGraph.getEdges();
-        for (int i = 0; i < edgesFromInput; i++) {
-            int first = jsonGraph.getEdgeList()
-                .get(i)
-                .getFirst();
-            int second = jsonGraph.getEdgeList()
-                .get(i)
-                .getSecond();
-            int weight = jsonGraph.getEdgeList()
-                .get(i)
-                .getWeight();
-            Edge edge = new Edge(first, second, weight);
-            
-            trees[first].addEdge(edge);
-            trees[second].addEdge(edge);
-            edges++;
-        }
-
-    }
-
-    public int getNodes() {
-        return nodes;
-    }
-
-    public int getEdges() {
-        return edges;
-    }
-
-    public Iterable<Edge> iterableTree(int i) {
-        return trees[i];
-    }
-
-    public Iterable<Edge> getAllEdges() {
-        Iterable<Edge> list = new Tree();
-        for (int i = 0; i < nodes; i++) {
-            for (Edge edge : iterableTree(i)) {
-                if (edge.getOtherNode(i) > i) {
-                    ((Tree) list).addEdge(edge);
-                }
-            }
-        }
-        return list;
-    }
-}

algorithms-miscellaneous-5/src/main/java/com/baeldung/algorithms/boruvka/Input.java

@@ -1,65 +0,0 @@
-package com.baeldung.algorithms.boruvka;
-
-import java.util.List;
-
-public class Input {
-    private int nodes;
-    private int edges;
-    private List<E> edgeList;
-
-    public int getNodes() {
-        return nodes;
-    }
-
-    public void setNodes(int nodes) {
-        this.nodes = nodes;
-    }
-
-    public int getEdges() {
-        return edges;
-    }
-
-    public void setEdges(int edges) {
-        this.edges = edges;
-    }
-
-    public List<E> getEdgeList() {
-        return edgeList;
-    }
-
-    public void setEdgeList(List<E> edgeList) {
-        this.edgeList = edgeList;
-    }
-
-    static class E {
-        private int first;
-        private int second;
-        private int weight;
-
-        public int getFirst() {
-            return first;
-        }
-
-        public void setFirst(int first) {
-            this.first = first;
-        }
-
-        public int getSecond() {
-            return second;
-        }
-
-        public void setSecond(int second) {
-            this.second = second;
-        }
-
-        public int getWeight() {
-            return weight;
-        }
-
-        public void setWeight(int weight) {
-            this.weight = weight;
-        }
-
-    }
-
-}

algorithms-miscellaneous-5/src/main/java/com/baeldung/algorithms/boruvka/Tree.java

@@ -1,63 +0,0 @@
-package com.baeldung.algorithms.boruvka;
-
-import java.util.Iterator;
-
-public class Tree implements Iterable<Edge> {
-    private Node root;
-    private int edgeCount;
-
-    private static class Node {
-        private Edge edge;
-        private Node next;
-
-        public String toString() {
-            String nextStr = next != null ? next.toString() : "";
-            return edge.toString() + " | " + nextStr;
-        }
-    }
-
-    public Tree() {
-        root = null;
-        edgeCount = 0;
-    }
-
-    public int getEdgeCount() {
-        return edgeCount;
-    }
-
-    public void addEdge(Edge edge) {
-        Node oldRoot = root;
-        root = new Node();
-        root.edge = edge;
-        root.next = oldRoot;
-        edgeCount++;
-    }
-
-    public String toString() {
-        String rootStr = root != null ? root.toString() : "";
-        return "Tree: " + rootStr + "Size: " + edgeCount;
-    }
-
-    public Iterator<Edge> iterator() {
-        return new LinkedIterator(root);
-    }
-
-    private class LinkedIterator implements Iterator<Edge> {
-        private Node current;
-
-        public LinkedIterator(Node root) {
-            current = root;
-        }
-
-        public boolean hasNext() {
-            return current != null;
-        }
-
-        public Edge next() {
-            Edge edge = current.edge;
-            current = current.next;
-            return edge;
-        }
-    }
-
-}

algorithms-miscellaneous-5/src/test/java/com/baeldung/algorithms/boruvka/BoruvkaUnitTest.java

@@ -1,48 +0,0 @@
-package com.baeldung.algorithms.boruvka;
-
-import static org.junit.jupiter.api.Assertions.assertEquals;
-
-import java.io.BufferedReader;
-import java.io.IOException;
-import java.io.InputStreamReader;
-
-import org.junit.Before;
-import org.junit.Test;
-
-import com.fasterxml.jackson.core.JsonParseException;
-import com.fasterxml.jackson.databind.JsonMappingException;
-import com.fasterxml.jackson.databind.ObjectMapper;
-
-public class BoruvkaUnitTest {
-
-    private Input input;
-    private static String INPUT_JSON = "/input.json";
-
-    @Before
-    public void convertInputJsonToObject() throws JsonParseException, JsonMappingException, IOException {
-        ObjectMapper mapper = new ObjectMapper();
-        StringBuilder jsonStr = new StringBuilder();
-        try (BufferedReader bufferedReader = new BufferedReader(new InputStreamReader(BoruvkaMST.class.getResourceAsStream(INPUT_JSON)))) {
-            String line;
-            while ((line = bufferedReader.readLine()) != null) {
-                jsonStr.append(line)
-                    .append("\n");
-            }
-        }
-
-        input = mapper.readValue(jsonStr.toString(), Input.class);
-
-    }
-
-    @Test
-    public void givenInputGraph_whenBoruvkaPerformed_thenMinimumSpanningTree() throws JsonParseException, JsonMappingException, IOException {
-        Graph graph = new Graph(input);
-        BoruvkaMST boruvkaMST = new BoruvkaMST(graph);
-
-        Tree mst = (Tree) boruvkaMST.getMST();
-
-        assertEquals(30, boruvkaMST.getTotalWeight());
-        assertEquals(4, mst.getEdgeCount());
-    }
-
-}

algorithms-miscellaneous-6/pom.xml

@@ -0,0 +1,27 @@
+<?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>
+    <artifactId>algorithms-miscellaneous-6</artifactId>
+    <version>0.0.1-SNAPSHOT</version>
+    <name>algorithms-miscellaneous-6</name>
+
+    <parent>
+        <groupId>com.baeldung</groupId>
+        <artifactId>parent-modules</artifactId>
+        <version>1.0.0-SNAPSHOT</version>
+    </parent>
+    
+    <dependencies>
+    <dependency>
+            <groupId>com.google.guava</groupId>
+            <artifactId>guava</artifactId>
+            <version>${guava.version}</version>
+        </dependency>
+    </dependencies>
+    
+    <properties>
+        <guava.version>28.1-jre</guava.version>
+    </properties>
+
+</project>

algorithms-miscellaneous-6/src/main/java/com/baeldung/algorithms/boruvka/BoruvkaMST.java

@@ -0,0 +1,84 @@
+package com.baeldung.algorithms.boruvka;
+
+import com.google.common.graph.EndpointPair;
+import com.google.common.graph.MutableValueGraph;
+import com.google.common.graph.ValueGraphBuilder;
+
+public class BoruvkaMST {
+
+    private static MutableValueGraph<Integer, Integer> mst = ValueGraphBuilder.undirected()
+        .build();
+    private static int totalWeight;
+
+    public BoruvkaMST(MutableValueGraph<Integer, Integer> graph) {
+
+        int size = graph.nodes().size();
+
+        UnionFind uf = new UnionFind(size);
+
+        // repeat at most log N times or until we have N-1 edges
+        for (int t = 1; t < size && mst.edges().size() < size - 1; t = t + t) {
+            
+            EndpointPair<Integer>[] closestEdgeArray = new EndpointPair[size];
+
+            // foreach tree in graph, find closest edge
+            for (EndpointPair<Integer> edge : graph.edges()) {
+                int u = edge.nodeU();
+                int v = edge.nodeV();
+                int uParent = uf.find(u);
+                int vParent = uf.find(v);
+                if (uParent == vParent) {
+                    continue; // same tree
+                }
+
+                int weight = graph.edgeValueOrDefault(u, v, 0);
+
+                if (closestEdgeArray[uParent] == null) {
+                    closestEdgeArray[uParent] = edge;
+                }
+                if (closestEdgeArray[vParent] == null) {
+                    closestEdgeArray[vParent] = edge;
+                }
+
+                int uParentWeight = graph.edgeValueOrDefault(closestEdgeArray[uParent].nodeU(), closestEdgeArray[uParent].nodeV(), 0);
+                int vParentWeight = graph.edgeValueOrDefault(closestEdgeArray[vParent].nodeU(), closestEdgeArray[vParent].nodeV(), 0);
+
+                if (weight < uParentWeight) {
+                    closestEdgeArray[uParent] = edge;
+                }
+                if (weight < vParentWeight) {
+                    closestEdgeArray[vParent] = edge;
+                }
+            }
+
+            // add newly discovered edges to MST
+            for (int i = 0; i < size; i++) {
+                EndpointPair<Integer> edge = closestEdgeArray[i];
+                if (edge != null) {
+                    int u = edge.nodeU();
+                    int v = edge.nodeV();
+                    int weight = graph.edgeValueOrDefault(u, v, 0);
+                    // don't add the same edge twice
+                    if (uf.find(u) != uf.find(v)) {
+                        mst.putEdgeValue(u, v, weight);
+                        totalWeight += weight;
+                        uf.union(u, v);
+                    }
+                }
+            }
+        }
+    }
+
+    public MutableValueGraph<Integer, Integer> getMST() {
+        return mst;
+    }
+
+    public int getTotalWeight() {
+        return totalWeight;
+    }
+
+    public String toString() {
+        return "MST: " + mst.toString() + " | Total Weight: " + totalWeight;
+    }
+
+}

algorithms-miscellaneous-6/src/main/java/com/baeldung/algorithms/boruvka/UnionFind.java

@@ -0,0 +1,39 @@
+package com.baeldung.algorithms.boruvka;
+
+public class UnionFind {
+    private int[] parents;
+    private int[] ranks;
+
+    public UnionFind(int n) {
+        parents = new int[n];
+        ranks = new int[n];
+        for (int i = 0; i < n; i++) {
+            parents[i] = i;
+            ranks[i] = 0;
+        }
+    }
+
+    public int find(int u) {
+        while (u != parents[u]) {
+            u = parents[u];
+        }
+        return u;
+    }
+
+    public void union(int u, int v) {
+        int uParent = find(u);
+        int vParent = find(v);
+        if (uParent == vParent) {
+            return;
+        }
+
+        if (ranks[uParent] < ranks[vParent]) {
+            parents[uParent] = vParent;
+        } else if (ranks[uParent] > ranks[vParent]) {
+            parents[vParent] = uParent;
+        } else {
+            parents[vParent] = uParent;
+            ranks[uParent]++;
+        }
+    }
+}

algorithms-miscellaneous-6/src/main/java/com/baeldung/algorithms/gradientdescent/GradientDescent.java

@@ -0,0 +1,33 @@
+package com.baeldung.algorithms.gradientdescent;
+
+import java.util.function.Function;
+
+public class GradientDescent {
+
+    private final double precision = 0.000001;
+
+    public double findLocalMinimum(Function<Double, Double> f, double initialX) {
+        double stepCoefficient = 0.1;
+        double previousStep = 1.0;
+        double currentX = initialX;
+        double previousX = initialX;
+        double previousY = f.apply(previousX);
+        int iter = 100;
+
+        currentX += stepCoefficient * previousY;
+
+        while (previousStep > precision && iter > 0) {
+            iter--;
+            double currentY = f.apply(currentX);
+            if (currentY > previousY) {
+                stepCoefficient = -stepCoefficient / 2;
+            }
+            previousX = currentX;
+            currentX += stepCoefficient * previousY;
+            previousY = currentY;
+            previousStep = StrictMath.abs(currentX - previousX);
+        }
+        return currentX;
+    }
+
+}

algorithms-miscellaneous-6/src/test/java/com/baeldung/algorithms/boruvka/BoruvkaUnitTest.java

@@ -0,0 +1,37 @@
+package com.baeldung.algorithms.boruvka;
+
+import static org.junit.jupiter.api.Assertions.assertEquals;
+
+import org.junit.Before;
+import org.junit.Test;
+
+import com.google.common.graph.MutableValueGraph;
+import com.google.common.graph.ValueGraphBuilder;
+
+public class BoruvkaUnitTest {
+
+    private MutableValueGraph<Integer, Integer> graph;
+
+    @Before
+    public void setup() {
+        graph = ValueGraphBuilder.undirected()
+            .build();
+        graph.putEdgeValue(0, 1, 8);
+        graph.putEdgeValue(0, 2, 5);
+        graph.putEdgeValue(1, 2, 9);
+        graph.putEdgeValue(1, 3, 11);
+        graph.putEdgeValue(2, 3, 15);
+        graph.putEdgeValue(2, 4, 10);
+        graph.putEdgeValue(3, 4, 7);
+    }
+
+    @Test
+    public void givenInputGraph_whenBoruvkaPerformed_thenMinimumSpanningTree() {
+        BoruvkaMST boruvkaMST = new BoruvkaMST(graph);
+        MutableValueGraph<Integer, Integer> mst = boruvkaMST.getMST();
+
+        assertEquals(30, boruvkaMST.getTotalWeight());
+        assertEquals(4, mst.edges().size());
+    }
+
+}

algorithms-miscellaneous-6/src/test/java/com/baeldung/algorithms/gradientdescent/GradientDescentUnitTest.java

@@ -0,0 +1,20 @@
+package com.baeldung.algorithms.gradientdescent;
+
+import static org.junit.Assert.assertTrue;
+
+import java.util.function.Function;
+
+import org.junit.Test;
+
+public class GradientDescentUnitTest {
+
+    @Test
+    public void givenFunction_whenStartingPointIsOne_thenLocalMinimumIsFound() {
+        Function<Double, Double> df = x ->
+            StrictMath.abs(StrictMath.pow(x, 3)) - (3 * StrictMath.pow(x, 2)) + x;
+        GradientDescent gd = new GradientDescent();
+        double res = gd.findLocalMinimum(df, 1);
+        assertTrue(res > 1.78);
+        assertTrue(res < 1.84);
+    }
+}

aws-reactive/pom.xml

@@ -16,12 +16,6 @@
     <name>aws-reactive</name>
     <description>AWS Reactive Sample</description>
 
-    <properties>
-        <java.version>1.8</java.version>
-        <spring.version>2.2.1.RELEASE</spring.version>
-        <awssdk.version>2.10.27</awssdk.version>
-    </properties>
-
     <dependencyManagement>
         <dependencies>
 
@@ -105,4 +99,9 @@
         </plugins>
     </build>
 
+    <properties>
+        <java.version>1.8</java.version>
+        <spring.version>2.2.1.RELEASE</spring.version>
+        <awssdk.version>2.10.27</awssdk.version>
+    </properties>
 </project>

core-java-modules/core-java-concurrency-basic-2/src/test/java/com/baeldung/concurrent/atomic/AtomicMarkableReferenceUnitTest.java

@@ -0,0 +1,189 @@
+package com.baeldung.concurrent.atomic;
+
+import java.util.concurrent.atomic.AtomicMarkableReference;
+import org.junit.jupiter.api.Assertions;
+import org.junit.jupiter.api.Test;
+
+public class AtomicMarkableReferenceUnitTest {
+
+    class Employee {
+        private int id;
+        private String name;
+
+        Employee(int id, String name) {
+            this.id = id;
+            this.name = name;
+        }
+
+        public int getId() {
+            return id;
+        }
+
+        public void setId(int id) {
+            this.id = id;
+        }
+
+        public String getName() {
+            return name;
+        }
+
+        public void setName(String name) {
+            this.name = name;
+        }
+    }
+
+    @Test
+    void givenMarkValueAsTrue_whenUsingIsMarkedMethod_thenMarkValueShouldBeTrue() {
+        Employee employee = new Employee(123, "Mike");
+        AtomicMarkableReference<Employee> employeeNode = new AtomicMarkableReference<Employee>(employee, true);
+
+        Assertions.assertTrue(employeeNode.isMarked());
+    }
+
+    @Test
+    void givenMarkValueAsFalse_whenUsingIsMarkedMethod_thenMarkValueShouldBeFalse() {
+        Employee employee = new Employee(123, "Mike");
+        AtomicMarkableReference<Employee> employeeNode = new AtomicMarkableReference<Employee>(employee, false);
+
+        Assertions.assertFalse(employeeNode.isMarked());
+    }
+
+    @Test
+    void whenUsingGetReferenceMethod_thenCurrentReferenceShouldBeReturned() {
+        Employee employee = new Employee(123, "Mike");
+        AtomicMarkableReference<Employee> employeeNode = new AtomicMarkableReference<Employee>(employee, true);
+
+        Assertions.assertEquals(employee, employeeNode.getReference());
+    }
+
+    @Test
+    void whenUsingGetMethod_thenCurrentReferenceAndMarkShouldBeReturned() {
+        Employee employee = new Employee(123, "Mike");
+        AtomicMarkableReference<Employee> employeeNode = new AtomicMarkableReference<Employee>(employee, true);
+
+        boolean[] markHolder = new boolean[1];
+        Employee currentEmployee = employeeNode.get(markHolder);
+
+        Assertions.assertEquals(employee, currentEmployee);
+        Assertions.assertTrue(markHolder[0]);
+    }
+
+    @Test
+    void givenNewReferenceAndMark_whenUsingSetMethod_thenCurrentReferenceAndMarkShouldBeUpdated() {
+        Employee employee = new Employee(123, "Mike");
+        AtomicMarkableReference<Employee> employeeNode = new AtomicMarkableReference<Employee>(employee, true);
+
+        Employee newEmployee = new Employee(124, "John");
+        employeeNode.set(newEmployee, false);
+
+        Assertions.assertEquals(newEmployee, employeeNode.getReference());
+        Assertions.assertFalse(employeeNode.isMarked());
+    }
+
+    @Test
+    void givenTheSameObjectReference_whenUsingAttemptMarkMethod_thenMarkShouldBeUpdated() {
+        Employee employee = new Employee(123, "Mike");
+        AtomicMarkableReference<Employee> employeeNode = new AtomicMarkableReference<Employee>(employee, true);
+
+        Assertions.assertTrue(employeeNode.attemptMark(employee, false));
+        Assertions.assertFalse(employeeNode.isMarked());
+    }
+
+    @Test
+    void givenDifferentObjectReference_whenUsingAttemptMarkMethod_thenMarkShouldNotBeUpdated() {
+        Employee employee = new Employee(123, "Mike");
+        AtomicMarkableReference<Employee> employeeNode = new AtomicMarkableReference<Employee>(employee, true);
+        Employee expectedEmployee = new Employee(123, "Mike");
+
+        Assertions.assertFalse(employeeNode.attemptMark(expectedEmployee, false));
+        Assertions.assertTrue(employeeNode.isMarked());
+    }
+
+    @Test
+    void givenCurrentReferenceAndCurrentMark_whenUsingCompareAndSet_thenReferenceAndMarkShouldBeUpdated() {
+        Employee employee = new Employee(123, "Mike");
+        AtomicMarkableReference<Employee> employeeNode = new AtomicMarkableReference<Employee>(employee, true);
+        Employee newEmployee = new Employee(124, "John");
+
+        Assertions.assertTrue(employeeNode.compareAndSet(employee, newEmployee, true, false));
+        Assertions.assertEquals(newEmployee, employeeNode.getReference());
+        Assertions.assertFalse(employeeNode.isMarked());
+    }
+
+    @Test
+    void givenNotCurrentReferenceAndCurrentMark_whenUsingCompareAndSet_thenReferenceAndMarkShouldNotBeUpdated() {
+        Employee employee = new Employee(123, "Mike");
+        AtomicMarkableReference<Employee> employeeNode = new AtomicMarkableReference<Employee>(employee, true);
+        Employee newEmployee = new Employee(124, "John");
+
+        Assertions.assertFalse(employeeNode.compareAndSet(new Employee(1234, "Steve"), newEmployee, true, false));
+        Assertions.assertEquals(employee, employeeNode.getReference());
+        Assertions.assertTrue(employeeNode.isMarked());
+    }
+
+    @Test
+    void givenCurrentReferenceAndNotCurrentMark_whenUsingCompareAndSet_thenReferenceAndMarkShouldNotBeUpdated() {
+        Employee employee = new Employee(123, "Mike");
+        AtomicMarkableReference<Employee> employeeNode = new AtomicMarkableReference<Employee>(employee, true);
+        Employee newEmployee = new Employee(124, "John");
+
+        Assertions.assertFalse(employeeNode.compareAndSet(employee, newEmployee, false, true));
+        Assertions.assertEquals(employee, employeeNode.getReference());
+        Assertions.assertTrue(employeeNode.isMarked());
+    }
+
+    @Test
+    void givenNotCurrentReferenceAndNotCurrentMark_whenUsingCompareAndSet_thenReferenceAndMarkShouldNotBeUpdated() {
+        Employee employee = new Employee(123, "Mike");
+        AtomicMarkableReference<Employee> employeeNode = new AtomicMarkableReference<Employee>(employee, true);
+        Employee newEmployee = new Employee(124, "John");
+
+        Assertions.assertFalse(employeeNode.compareAndSet(new Employee(1234, "Steve"), newEmployee, false, true));
+        Assertions.assertEquals(employee, employeeNode.getReference());
+        Assertions.assertTrue(employeeNode.isMarked());
+    }
+
+    @Test
+    void givenCurrentReferenceAndCurrentMark_whenUsingWeakCompareAndSet_thenReferenceAndMarkShouldBeUpdated() {
+        Employee employee = new Employee(123, "Mike");
+        AtomicMarkableReference<Employee> employeeNode = new AtomicMarkableReference<Employee>(employee, true);
+        Employee newEmployee = new Employee(124, "John");
+
+        Assertions.assertTrue(employeeNode.weakCompareAndSet(employee, newEmployee, true, false));
+        Assertions.assertEquals(newEmployee, employeeNode.getReference());
+        Assertions.assertFalse(employeeNode.isMarked());
+    }
+
+    @Test
+    void givenNotCurrentReferenceAndCurrentMark_whenUsingWeakCompareAndSet_thenReferenceAndMarkShouldNotBeUpdated() {
+        Employee employee = new Employee(123, "Mike");
+        AtomicMarkableReference<Employee> employeeNode = new AtomicMarkableReference<Employee>(employee, true);
+        Employee newEmployee = new Employee(124, "John");
+
+        Assertions.assertFalse(employeeNode.weakCompareAndSet(new Employee(1234, "Steve"), newEmployee, true, false));
+        Assertions.assertEquals(employee, employeeNode.getReference());
+        Assertions.assertTrue(employeeNode.isMarked());
+    }
+
+    @Test
+    void givenCurrentReferenceAndNotCurrentMark_whenUsingWeakCompareAndSet_thenReferenceAndMarkShouldNotBeUpdated() {
+        Employee employee = new Employee(123, "Mike");
+        AtomicMarkableReference<Employee> employeeNode = new AtomicMarkableReference<Employee>(employee, true);
+        Employee newEmployee = new Employee(124, "John");
+
+        Assertions.assertFalse(employeeNode.weakCompareAndSet(employee, newEmployee, false, true));
+        Assertions.assertEquals(employee, employeeNode.getReference());
+        Assertions.assertTrue(employeeNode.isMarked());
+    }
+
+    @Test
+    void givenNotCurrentReferenceAndNotCurrentMark_whenUsingWeakCompareAndSet_thenReferenceAndMarkShouldNotBeUpdated() {
+        Employee employee = new Employee(123, "Mike");
+        AtomicMarkableReference<Employee> employeeNode = new AtomicMarkableReference<Employee>(employee, true);
+        Employee newEmployee = new Employee(124, "John");
+
+        Assertions.assertFalse(employeeNode.weakCompareAndSet(new Employee(1234, "Steve"), newEmployee, false, true));
+        Assertions.assertEquals(employee, employeeNode.getReference());
+        Assertions.assertTrue(employeeNode.isMarked());
+    }
+}

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

@@ -1,43 +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>
-  <groupId>com.baeldung.concurrent.lock</groupId>
-  <artifactId>core-java-concurrency-collections-2</artifactId>
-  <version>0.0.1-SNAPSHOT</version>
+<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.concurrent.lock</groupId>
+    <artifactId>core-java-concurrency-collections-2</artifactId>
+    <version>0.0.1-SNAPSHOT</version>
 
-  <properties>
-      <jmh.version>1.21</jmh.version>
-      <guava.version>28.2-jre</guava.version>
-  </properties>
+    <dependencies>
+        <dependency>
+            <groupId>com.google.guava</groupId>
+            <artifactId>guava</artifactId>
+            <version>${guava.version}</version>
+        </dependency>
+        <dependency>
+            <groupId>org.openjdk.jmh</groupId>
+            <artifactId>jmh-core</artifactId>
+            <version>${jmh.version}</version>
+        </dependency>
+        <dependency>
+            <groupId>org.openjdk.jmh</groupId>
+            <artifactId>jmh-generator-annprocess</artifactId>
+            <version>${jmh.version}</version>
+        </dependency>
 
-  <dependencies>
-    <dependency>
-        <groupId>com.google.guava</groupId>
-        <artifactId>guava</artifactId>
-        <version>${guava.version}</version>
-    </dependency>    
-    <dependency>
-        <groupId>org.openjdk.jmh</groupId>
-        <artifactId>jmh-core</artifactId>
-        <version>${jmh.version}</version>
-    </dependency>
-    <dependency>
-        <groupId>org.openjdk.jmh</groupId>
-        <artifactId>jmh-generator-annprocess</artifactId>
-        <version>${jmh.version}</version>
-    </dependency>
+    </dependencies>
+    <build>
+        <sourceDirectory>src</sourceDirectory>
+        <plugins>
+            <plugin>
+                <artifactId>maven-compiler-plugin</artifactId>
+                <version>3.8.0</version>
+                <configuration>
+                    <source>1.8</source>
+                    <target>1.8</target>
+                </configuration>
+            </plugin>
+        </plugins>
+    </build>
+
+    <properties>
+        <jmh.version>1.21</jmh.version>
+        <guava.version>28.2-jre</guava.version>
+    </properties>
 
-  </dependencies>
-  <build>
-    <sourceDirectory>src</sourceDirectory>
-    <plugins>
-      <plugin>
-        <artifactId>maven-compiler-plugin</artifactId>
-        <version>3.8.0</version>
-        <configuration>
-          <source>1.8</source>
-          <target>1.8</target>
-        </configuration>
-      </plugin>
-    </plugins>
-  </build>
 </project>

core-java-modules/core-java-date-operations-2/src/main/java/com/baeldung/datetime/dayofweek/DayOfWeekExtractor.java

@@ -0,0 +1,35 @@
+package com.baeldung.datetime.dayofweek;
+
+import java.text.DateFormat;
+import java.text.SimpleDateFormat;
+import java.time.DayOfWeek;
+import java.time.LocalDate;
+import java.time.format.TextStyle;
+import java.util.Calendar;
+import java.util.Date;
+import java.util.Locale;
+
+public class DayOfWeekExtractor {
+
+    public static int getDayNumberOld(Date date) {
+        Calendar cal = Calendar.getInstance();
+        cal.setTime(date);
+        return cal.get(Calendar.DAY_OF_WEEK);
+    }
+    
+    public static String getDayStringOld(Date date, Locale locale ) {
+        DateFormat formatter = new SimpleDateFormat("EEEE", locale);
+        return formatter.format(date);
+    }
+
+    public static int getDayNumberNew(LocalDate date) {
+        DayOfWeek day = date.getDayOfWeek();
+        return day.getValue();
+    }
+
+    public static String getDayStringNew(LocalDate date, Locale locale ) {
+        DayOfWeek day = date.getDayOfWeek();
+        return day.getDisplayName(TextStyle.FULL, locale);
+    }
+    
+}

core-java-modules/core-java-date-operations-2/src/test/java/com/baeldung/datetime/dayofweek/DayOfWeekExtractorUnitTest.java

@@ -0,0 +1,52 @@
+package com.baeldung.datetime.dayofweek;
+
+import static org.assertj.core.api.Assertions.assertThat;
+
+import java.text.DateFormat;
+import java.text.ParseException;
+import java.text.SimpleDateFormat;
+import java.time.LocalDate;
+import java.util.Calendar;
+import java.util.Locale;
+
+import org.junit.Test;
+
+public class DayOfWeekExtractorUnitTest {
+    
+    private DateFormat oldDateParser = new SimpleDateFormat("yyyy-MM-dd"); 
+
+    @Test
+    public void givenFeb29_2020_thenOldSaturdayNumber() throws ParseException {
+        assertThat(DayOfWeekExtractor.getDayNumberOld(oldDateParser.parse("2020-02-29")) == Calendar.SATURDAY);
+    }
+
+    @Test
+    public void givenFeb29_2020_and_localeUS_thenOldSaturdayText() throws ParseException {
+        assertThat("Saturday".equals(DayOfWeekExtractor.getDayStringOld(oldDateParser.parse("2020-02-29"), Locale.US)) );
+    }
+
+    @Test
+    public void givenFeb29_2020_and_localeDE_thenOldSaturdayText() throws ParseException {
+        assertThat("Samstag".equals(DayOfWeekExtractor.getDayStringOld(oldDateParser.parse("2020-02-29"), Locale.GERMANY)) );
+    }
+
+    @Test
+    public void givenFeb29_2020_thenNewSaturdayNumber() throws ParseException {
+        assertThat(DayOfWeekExtractor.getDayNumberNew(LocalDate.parse("2020-02-29")) == Calendar.SATURDAY);
+    }
+
+    @Test
+    public void givenFeb29_2020_and_localeUS_thenNewSaturdayText() throws ParseException {
+        assertThat("Saturday".equals(DayOfWeekExtractor.getDayStringOld(oldDateParser.parse("2020-02-29"), Locale.US)) );
+    }
+
+    @Test
+    public void givenFeb29_2020_and_localeDE_thenNewSaturdayText() throws ParseException {
+        assertThat("Samstag".equals(DayOfWeekExtractor.getDayStringOld(oldDateParser.parse("2020-02-29"), Locale.GERMANY)) );
+    }
+
+
+}
+
+
+

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

@@ -64,6 +64,11 @@
             <artifactId>jmh-generator-annprocess</artifactId>
             <version>${jmh-generator.version}</version>
         </dependency>
+        <dependency>
+            <groupId>commons-codec</groupId>
+            <artifactId>commons-codec</artifactId>
+            <version>${commons-codec.version}</version>
+        </dependency>
 
         <dependency>
             <groupId>org.assertj</groupId>
@@ -113,6 +118,7 @@
         <hibernate-validator.version>6.0.2.Final</hibernate-validator.version>
         <javax.el-api.version>3.0.0</javax.el-api.version>
         <javax.el.version>2.2.6</javax.el.version>
+        <commons-codec.version>1.14</commons-codec.version>
     </properties>
 
 </project>

core-kotlin-modules/pom.xml

@@ -1,6 +1,8 @@
 <?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">
+<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.core-kotlin-modules</groupId>
     <artifactId>core-kotlin-modules</artifactId>

core-scala/README.md

@@ -1,8 +0,0 @@
-## Core Scala
-
-This module contains articles about Scala's core features
-
-### Relevant Articles: 
-
-- [Introduction to Scala](https://www.baeldung.com/scala-intro)
-- [Regular Expressions in Scala](https://www.baeldung.com/scala/regular-expressions)

core-scala/pom.xml

@@ -1,6 +1,8 @@
 <?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">
+<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-scala</artifactId>
     <version>1.0-SNAPSHOT</version>
@@ -51,5 +53,5 @@
         <scala.version>2.12.7</scala.version>
         <scala.plugin.version>3.3.2</scala.plugin.version>
     </properties>
-</project>
 
+</project>

core-scala/src/main/scala/com/baeldung/scala/ControlStructuresDemo.scala

@@ -1,44 +0,0 @@
-package com.baeldung.scala
-
-/**
- * Sample code demonstrating the various control structured.
- *
- * @author Chandra Prakash
- *
- */
-object ControlStructuresDemo {
-  def gcd(x : Int, y : Int) : Int = {
-    if (y == 0) x else gcd(y, x % y)
-  }
-
-  def gcdIter(x : Int, y : Int) : Int = {
-    var a = x
-    var b = y
-    while (b > 0) {
-      a = a % b
-      val t = a
-      a = b
-      b = t
-    }
-    a
-  }
-
-  def rangeSum(a : Int, b : Int) = {
-    var sum = 0;
-    for (i <- a to b) {
-      sum += i
-    }
-    sum
-  }
-
-  def factorial(a : Int) : Int = {
-    var result = 1;
-    var i = 1;
-    do {
-      result *= i
-      i = i + 1
-    } while (i <= a)
-    result
-  }
-
-}

core-scala/src/main/scala/com/baeldung/scala/Employee.scala

@@ -1,27 +0,0 @@
-package com.baeldung.scala
-
-/**
- * Sample Code demonstrating a class.
- *
- * @author Chandra Prakash
- *
- */
-class Employee(val name : String,
-               var salary : Int,
-               annualIncrement : Int = 20) {
-
-  def incrementSalary() : Unit = {
-    salary += annualIncrement
-  }
-
-  override def toString =
-    s"Employee(name=$name, salary=$salary)"
-}
-
-/**
- * A Trait which will make the toString return upper case value.
- */
-trait UpperCasePrinter {
-  override def toString: String = super.toString toUpperCase
-}
-

core-scala/src/main/scala/com/baeldung/scala/HelloWorld.scala

@@ -1,6 +0,0 @@
-package com.baeldung.scala
-
-object HelloWorld extends App {
-  println("Hello World!")
-  args foreach println
-}

core-scala/src/main/scala/com/baeldung/scala/HigherOrderFunctions.scala

@@ -1,27 +0,0 @@
-package com.baeldung.scala
-
-/**
- * Sample higher order functions.
- *
- * @author Chandra Prakash
- *
- */
-object HigherOrderFunctions {
-
-  def mapReduce(r : (Int, Int) => Int,
-                i : Int,
-                m : Int => Int,
-                a : Int, b : Int): Int = {
-    def iter(a : Int, result : Int) : Int = {
-      if (a > b) result
-      else iter(a + 1, r(m(a), result))
-    }
-    iter(a, i)
-  }
-
-  def whileLoop(condition : => Boolean)(body : => Unit) : Unit =
-    if (condition) {
-      body
-      whileLoop(condition)(body)
-    }
-}

core-scala/src/main/scala/com/baeldung/scala/IntSet.scala

@@ -1,34 +0,0 @@
-package com.baeldung.scala
-
-/**
- * An abstract class for set of integers and its implementation.
- *
- * @author Chandra Prakash
- *
- */
-abstract class IntSet {
-  // add an element to the set
-  def incl(x : Int) : IntSet
-
-  // whether an element belongs to the set
-  def contains(x : Int) : Boolean
-}
-
-class EmptyIntSet extends IntSet {
-
-  def contains(x : Int) : Boolean = false
-
-  def incl(x : Int) =
-    new NonEmptyIntSet(x, this)
-}
-
-class NonEmptyIntSet(val head : Int, val tail : IntSet)
-  extends IntSet {
-
-  def contains(x : Int) : Boolean =
-    head == x || (tail contains x)
-
-  def incl(x : Int) : IntSet =
-    if (this contains x) this
-    else new NonEmptyIntSet(x, this)
-}

core-scala/src/main/scala/com/baeldung/scala/PatternMatching.scala

@@ -1,137 +0,0 @@
-package com.baeldung.scala
-
-// Case Class
-abstract class Animal
-
-case class Mammal(name: String, fromSea: Boolean) extends Animal
-
-case class Bird(name: String) extends Animal
-
-case class Fish(name: String) extends Animal
-
-// Sealed Class
-sealed abstract class CardSuit
-
-case class Spike() extends CardSuit
-
-case class Diamond() extends CardSuit
-
-case class Heart() extends CardSuit
-
-case class Club() extends CardSuit
-
-object Person {
-  def apply(fullName: String) = fullName
-
-  def unapply(fullName: String): Option[String] = {
-    if (!fullName.isEmpty)
-      Some(fullName.replaceAll("(?<=\\w)(\\w+)", "."))
-    else
-      None
-  }
-}
-
-class PatternMatching {
-
-  def caseClassesPatternMatching(animal: Animal): String = {
-    animal match {
-      case Mammal(name, fromSea) => s"I'm a $name, a kind of mammal. Am I from the sea? $fromSea"
-      case Bird(name) => s"I'm a $name, a kind of bird"
-      case _ => "I'm an unknown animal"
-    }
-  }
-
-  def constantsPatternMatching(constant: Any): String = {
-    constant match {
-      case 0 => "I'm equal to zero"
-      case 4.5d => "I'm a double"
-      case false => "I'm the contrary of true"
-      case _ => s"I'm unknown and equal to $constant"
-    }
-  }
-
-  def sequencesPatternMatching(sequence: Any): String = {
-    sequence match {
-      case List(singleElement) => s"I'm a list with one element: $singleElement"
-      case List(_, _*) => s"I'm a list with one or multiple elements: $sequence"
-      case Vector(1, 2, _*) => s"I'm a vector: $sequence"
-      case _ => s"I'm an unrecognized sequence. My value: $sequence"
-    }
-  }
-
-  def tuplesPatternMatching(tuple: Any): String = {
-    tuple match {
-      case (first, second) => s"I'm a tuple with two elements: $first & $second"
-      case (first, second, third) => s"I'm a tuple with three elements: $first & $second & $third"
-      case _ => s"Unrecognized pattern. My value: $tuple"
-    }
-  }
-
-  def typedPatternMatching(any: Any): String = {
-    any match {
-      case string: String => s"I'm a string. My value: $string"
-      case integer: Int => s"I'm an integer. My value: $integer"
-      case _ => s"I'm from an unknown type. My value: $any"
-    }
-  }
-
-  def regexPatterns(toMatch: String): String = {
-    val numeric = """([0-9]+)""".r
-    val alphabetic = """([a-zA-Z]+)""".r
-    val alphanumeric = """([a-zA-Z0-9]+)""".r
-
-    toMatch match {
-      case numeric(value) => s"I'm a numeric with value $value"
-      case alphabetic(value) => s"I'm an alphabetic with value $value"
-      case alphanumeric(value) => s"I'm an alphanumeric with value $value"
-      case _ => s"I contain other characters than alphanumerics. My value $toMatch"
-    }
-  }
-
-  def optionsPatternMatching(option: Option[String]): String = {
-    option match {
-      case Some(value) => s"I'm not an empty option. Value $value"
-      case None => "I'm an empty option"
-    }
-  }
-
-  def patternGuards(toMatch: Any, maxLength: Int): String = {
-    toMatch match {
-      case list: List[Any] if (list.size <= maxLength) => "List is of acceptable size"
-      case list: List[Any] => "List has not an acceptable size"
-      case string: String if (string.length <= maxLength) => "String is of acceptable size"
-      case string: String => "String has not an acceptable size"
-      case _ => "Input is neither a List or a String"
-    }
-  }
-
-  def sealedClass(cardSuit: CardSuit): String = {
-    cardSuit match {
-      case Spike() => "Card is spike"
-      case Club() => "Card is club"
-      case Heart() => "Card is heart"
-      case Diamond() => "Card is diamond"
-    }
-  }
-
-  def extractors(person: Any): String = {
-    person match {
-      case Person(initials) => s"My initials are $initials"
-      case _ => "Could not extract initials"
-    }
-  }
-
-  def closuresPatternMatching(list: List[Any]): List[Any] = {
-    list.collect { case i: Int if (i < 10) => i }
-  }
-
-  def catchBlocksPatternMatching(exception: Exception): String = {
-    try {
-      throw exception
-    } catch {
-      case ex: IllegalArgumentException => "It's an IllegalArgumentException"
-      case ex: RuntimeException => "It's a RuntimeException"
-      case _ => "It's an unknown kind of exception"
-    }
-  }
-}

core-scala/src/main/scala/com/baeldung/scala/Utils.scala

@@ -1,33 +0,0 @@
-package com.baeldung.scala
-
-/**
- * Some utility methods.
- *
- * @author Chandra Prakash
- *
- */
-object Utils {
-  def average(x : Double, y : Double): Double = (x + y) / 2
-
-  def randomLessThan(d : Double): Double = {
-    var random = 0d
-    do {
-      random = Math.random()
-    } while (random >= d)
-    random
-  }
-
-  def power(x : Int, y : Int) : Int = {
-    def powNested(i : Int, accumulator : Int) : Int = {
-      if (i <= 0) accumulator
-      else powNested(i - 1, x * accumulator)
-    }
-    powNested(y, 1)
-  }
-
-  def fibonacci(n : Int) : Int = n match {
-    case 0 | 1 => 1
-    case x if x > 1 =>
-      fibonacci(x - 1) + fibonacci(x - 2)
-  }
-}

core-scala/src/test/scala/com/baeldung/scala/ControlStructuresDemoUnitTest.scala

@@ -1,33 +0,0 @@
-package com.baeldung.scala
-
-import com.baeldung.scala.ControlStructuresDemo._
-import org.junit.Assert.assertEquals
-import org.junit.Test
-
-class ControlStructuresDemoUnitTest {
-  @Test
-  def givenTwoIntegers_whenGcdCalled_thenCorrectValueReturned() = {
-    assertEquals(3, gcd(15, 27))
-  }
-
-  @Test
-  def givenTwoIntegers_whenGcdIterCalled_thenCorrectValueReturned() = {
-    assertEquals(3, gcdIter(15, 27))
-  }
-
-  @Test
-  def givenTwoIntegers_whenRangeSumcalled_thenCorrectValueReturned() = {
-    assertEquals(55, rangeSum(1, 10))
-  }
-
-  @Test
-  def givenPositiveInteger_whenFactorialInvoked_thenCorrectValueReturned() = {
-    assertEquals(720, factorial(6))
-  }
-
-  @Test
-  def whenFactorialOf0Invoked_then1Returned() = {
-    assertEquals(1, factorial(0))
-  }
-
-}

core-scala/src/test/scala/com/baeldung/scala/EmployeeUnitTest.scala

@@ -1,30 +0,0 @@
-package com.baeldung.scala
-
-import org.junit.Assert.assertEquals
-import org.junit.Test
-
-class EmployeeUnitTest {
-
-  @Test
-  def whenEmployeeSalaryIncremented_thenCorrectSalary() = {
-    val employee = new Employee("John Doe", 1000)
-    employee.incrementSalary()
-    assertEquals(1020, employee.salary)
-  }
-
-  @Test
-  def givenEmployee_whenToStringCalled_thenCorrectStringReturned() = {
-    val employee = new Employee("John Doe", 1000)
-    assertEquals("Employee(name=John Doe, salary=1000)", employee.toString)
-  }
-
-  @Test
-  def givenEmployeeWithTrait_whenToStringCalled_thenCorrectStringReturned() = {
-    val employee =
-      new Employee("John Doe", 1000) with UpperCasePrinter
-    assertEquals("EMPLOYEE(NAME=JOHN DOE, SALARY=1000)", employee.toString)
-  }
-
-}
-
-

core-scala/src/test/scala/com/baeldung/scala/HigherOrderFunctionsExamplesUnitTest.scala

@@ -1,82 +0,0 @@
-package com.baeldung.scala
-
-import org.junit.Assert.assertEquals
-import org.junit.Test
-
-
-class HigherOrderFunctionsExamplesUnitTest {
-
-  @Test
-  def whenCallingMapWithAnonymousFunction_thenTransformationIsApplied() = {
-    val expected = Seq("sir Alex Ferguson", "sir Bobby Charlton", "sir Frank Lampard")
-
-    val names = Seq("Alex Ferguson", "Bobby Charlton", "Frank Lampard")
-    val sirNames = names.map(name => "sir " + name)
-
-    assertEquals(expected, sirNames)
-  }
-
-  @Test
-  def whenCallingMapWithDefined_thenTransformationIsApplied() = {
-    val expected = Seq("sir Alex Ferguson", "sir Bobby Charlton", "sir Frank Lampard")
-
-    val names = Seq("Alex Ferguson", "Bobby Charlton", "Frank Lampard")
-
-    def prefixWithSir(name: String) = "sir " + name
-    val sirNames = names.map(prefixWithSir)
-
-    assertEquals(expected, sirNames)
-  }
-
-  @Test
-  def whenCallingFilter_thenUnecessaryElementsAreRemoved() = {
-    val expected = Seq("John O'Shea", "John Hartson")
-
-    val names = Seq("John O'Shea", "Aiden McGeady", "John Hartson")
-    val johns = names.filter(name => name.matches("^John .*"))
-
-    assertEquals(expected, johns)
-  }
-
-  @Test
-  def whenCallingReduce_thenProperSumIsCalculated() = {
-    val expected = 2750
-
-    val earnings = Seq(1000, 1300, 450)
-    val sumEarnings = earnings.reduce((acc, x) => acc + x)
-
-    assertEquals(expected, sumEarnings)
-  }
-
-  @Test
-  def whenCallingFold_thenNumberOfWordsShouldBeCalculated() = {
-    val expected = 6
-
-    val strings = Seq("bunch of words", "just me", "it")
-    val sumEarnings = strings.foldLeft(0)((acc, x) => acc + x.split(" ").size)
-
-    assertEquals(expected, sumEarnings)
-  }
-
-  @Test
-  def whenCallingOwnHigherOrderFunction_thenProperFunctionIsReturned() = {
-    def mathOperation(name: String): (Int, Int) => Int = (x: Int, y: Int) => {
-      name match {
-        case "addition" => x + y
-        case "multiplication" => x * y
-        case "division" => x/y
-        case "subtraction" => x - y
-      }
-    }
-
-    def add: (Int, Int) => Int = mathOperation("addition")
-    def mul: (Int, Int) => Int = mathOperation("multiplication")
-    def div: (Int, Int) => Int = mathOperation("division")
-    def sub: (Int, Int) => Int = mathOperation("subtraction")
-
-    assertEquals(15, add(10, 5))
-    assertEquals(50, mul(10, 5))
-    assertEquals(2, div(10, 5))
-    assertEquals(5, sub(10, 5))
-  }
-}

core-scala/src/test/scala/com/baeldung/scala/HigherOrderFunctionsUnitTest.scala

@@ -1,48 +0,0 @@
-package com.baeldung.scala
-
-import com.baeldung.scala.HigherOrderFunctions.mapReduce
-import org.junit.Assert.assertEquals
-import org.junit.Test
-
-class HigherOrderFunctionsUnitTest {
-
-  @Test
-  def whenCalledWithSumAndSquareFunctions_thenCorrectValueReturned() = {
-    def square(x : Int) = x * x
-
-    def sum(x : Int, y : Int) = x + y
-
-    def sumSquares(a : Int, b : Int) =
-      mapReduce(sum, 0, square, a, b)
-
-    assertEquals(385, sumSquares(1, 10))
-  }
-
-  @Test
-  def whenComputingSumOfSquaresWithAnonymousFunctions_thenCorrectValueReturned() = {
-    def sumSquares(a : Int, b : Int) =
-      mapReduce((x, y) => x + y, 0, x => x * x, a, b)
-
-    assertEquals(385, sumSquares(1, 10))
-  }
-
-  @Test
-  def givenCurriedFunctions_whenInvoked_thenCorrectValueReturned() = {
-    // a curried function
-    def sum(f : Int => Int)(a : Int,
-                            b : Int) : Int =
-      if (a > b) 0 else f(a) + sum(f)(a + 1, b)
-
-    // another curried function
-    def mod(n : Int)(x : Int) = x % n
-
-    // application of a curried function
-    assertEquals(1, mod(5)(6))
-
-    // partial application of curried function
-    // trailing underscore is required to make function type explicit
-    val sumMod5 = sum(mod(5)) _
-
-    assertEquals(10, sumMod5(6, 10))
-  }
-}

core-scala/src/test/scala/com/baeldung/scala/IntSetUnitTest.scala

@@ -1,21 +0,0 @@
-package com.baeldung.scala
-
-import org.junit.Assert.assertFalse
-import org.junit.Test
-
-class IntSetUnitTest {
-
-  @Test
-  def givenSetof1To10_whenContains11Called_thenFalse() = {
-
-    // Set up a set containing integers 1 to 10.
-    val set1To10 =
-      Range(1, 10)
-        .foldLeft(new EmptyIntSet() : IntSet) {
-          (x, y) => x incl y
-        }
-
-    assertFalse(set1To10 contains 11)
-  }
-
-}

core-scala/src/test/scala/com/baeldung/scala/PatternMatchingUnitTest.scala

@@ -1,208 +0,0 @@
-package com.baeldung.scala
-
-import java.io.FileNotFoundException
-
-import org.junit.Assert.assertEquals
-import org.junit.Test
-
-class PatternMatchingUnitTest {
-  @Test
-  def whenAMammalIsGivenToTheMatchExpression_ThenItsRecognizedAsMammal(): Unit = {
-    val result = new PatternMatching().caseClassesPatternMatching(Mammal("Lion", fromSea = false))
-    assertEquals("I'm a Lion, a kind of mammal. Am I from the sea? false", result)
-  }
-
-  @Test
-  def whenABirdIsGivenToTheMatchExpression_ThenItsRecognizedAsBird(): Unit = {
-    val result = new PatternMatching().caseClassesPatternMatching(Bird("Pigeon"))
-    assertEquals("I'm a Pigeon, a kind of bird", result)
-  }
-
-  @Test
-  def whenAnUnkownAnimalIsGivenToTheMatchExpression_TheDefaultClauseIsUsed(): Unit = {
-    val result = new PatternMatching().caseClassesPatternMatching(Fish("Tuna"))
-    assertEquals("I'm an unknown animal", result)
-  }
-
-  @Test
-  def whenTheConstantZeroIsPassed_ThenItMatchesTheCorrespondingPattern(): Unit = {
-    val result = new PatternMatching().constantsPatternMatching(0)
-    assertEquals("I'm equal to zero", result)
-  }
-
-  @Test
-  def whenFourAndAHalfIsPassed_ThenItMatchesTheCorrespondingPattern(): Unit = {
-    val result = new PatternMatching().constantsPatternMatching(4.5d)
-    assertEquals("I'm a double", result)
-  }
-
-  @Test
-  def whenTheBooleanFalseIsPassed_ThenItMatchesTheCorrespondingPattern(): Unit = {
-    val result = new PatternMatching().constantsPatternMatching(false)
-    assertEquals("I'm the contrary of true", result)
-  }
-
-  @Test
-  def whenAnUnkownConstantIsPassed_ThenTheDefaultPatternIsUsed(): Unit = {
-    val result = new PatternMatching().constantsPatternMatching(true)
-    assertEquals("I'm unknown and equal to true", result)
-  }
-
-  @Test
-  def whenASingleElementListIsPassed_ThenItMatchesTheCorrespondingPattern(): Unit = {
-    val result = new PatternMatching().sequencesPatternMatching(List("String"))
-    assertEquals("I'm a list with one element: String", result)
-  }
-
-  @Test
-  def whenAMultipleElementsListIsPassed_ThenItMatchesTheCorrespondingPattern(): Unit = {
-    val result = new PatternMatching().sequencesPatternMatching(List("Multiple", "Elements"))
-    assertEquals("I'm a list with one or multiple elements: List(Multiple, Elements)", result)
-  }
-
-  @Test
-  def whenAVectorBeginningWithOneAndTwoIsPassed_ThenItMatchesTheCorrespondingPattern(): Unit = {
-    val result = new PatternMatching().sequencesPatternMatching(Vector(1, 2, 3))
-    assertEquals("I'm a vector: Vector(1, 2, 3)", result)
-  }
-
-  @Test
-  def whenANotMatchingVectorIsPassed_ThenItShouldntMatchAndEnterTheDefaultClause(): Unit = {
-    val result = new PatternMatching().sequencesPatternMatching(Vector(2, 1))
-    assertEquals("I'm an unrecognized sequence. My value: Vector(2, 1)", result)
-  }
-
-  @Test
-  def whenAnEmptyListIsPassed_ThenItShouldntMatchAndEnterTheDefaultClause(): Unit = {
-    val result = new PatternMatching().sequencesPatternMatching(List())
-    assertEquals("I'm an unrecognized sequence. My value: List()", result)
-  }
-
-  @Test
-  def whenATwoElementsTupleIsPassed_ThenItMatchesTheCorrespondingPattern(): Unit = {
-    val result = new PatternMatching().tuplesPatternMatching(("First", "Second"))
-    assertEquals("I'm a tuple with two elements: First & Second", result)
-  }
-
-  @Test
-  def whenAThreeElementsTupleIsPassed_ThenItMatchesTheCorrespondingPattern(): Unit = {
-    val result = new PatternMatching().tuplesPatternMatching(("First", "Second", "Third"))
-    assertEquals("I'm a tuple with three elements: First & Second & Third", result)
-  }
-
-  @Test
-  def whenAnoterKindOfTupleIsPassed_ThenItShouldntMatchAndReturnTheDefaultPattern(): Unit = {
-    val result = new PatternMatching().tuplesPatternMatching(("First"))
-    assertEquals("Unrecognized pattern. My value: First", result)
-  }
-
-  @Test
-  def whenAStringConsistingOfNumericsOnlyIsPassed_ThenItShouldMatchTheNumericRegex(): Unit = {
-    val result = new PatternMatching().regexPatterns("123")
-    assertEquals("I'm a numeric with value 123", result)
-  }
-
-  @Test
-  def whenAStringConsistignOfAlphabeticsOnlyIsPassed_ThenItShouldMatchTheAlphabeticRegex(): Unit = {
-    val result = new PatternMatching().regexPatterns("abc")
-    assertEquals("I'm an alphabetic with value abc", result)
-  }
-
-  @Test
-  def whenAStringConsistignOfAlphanumericsOnlyIsPassed_ThenItShouldMatchTheAlphanumericRegex(): Unit = {
-    val result = new PatternMatching().regexPatterns("abc123")
-    assertEquals("I'm an alphanumeric with value abc123", result)
-  }
-
-  @Test
-  def whenAnotherTypeOfStringIsPassed_ThenItShouldntMatchAndReturnTheDefaultPattern(): Unit = {
-    val result = new PatternMatching().regexPatterns("abc_123")
-    assertEquals("I contain other characters than alphanumerics. My value abc_123", result)
-  }
-
-  @Test
-  def whenAFilledOptionIsPassed_ThenItShouldMatchTheSomeClause(): Unit = {
-    val result = new PatternMatching().optionsPatternMatching(Option.apply("something"))
-    assertEquals("I'm not an empty option. Value something", result)
-  }
-
-  @Test
-  def whenAnEmptyOptionIsPassed_ThenItShouldMatchTheNoneClause(): Unit = {
-    val result = new PatternMatching().optionsPatternMatching(Option.empty)
-    assertEquals("I'm an empty option", result)
-  }
-
-  @Test
-  def whenAListWithAcceptedSizeIsPassed_ThenThePositiveMessageIsSent(): Unit = {
-    val result = new PatternMatching().patternGuards(List(1, 2), 3)
-    assertEquals("List is of acceptable size", result)
-  }
-
-  @Test
-  def whenAListWithAnUnacceptedSizeIsPassed_ThenTheNegativeMessageIsSent(): Unit = {
-    val result = new PatternMatching().patternGuards(List(1, 2, 3, 4), 3)
-    assertEquals("List has not an acceptable size", result)
-  }
-
-  @Test
-  def whenAStringWithAcceptedSizeIsPassed_ThenThePositiveMessageIsSent(): Unit = {
-    val result = new PatternMatching().patternGuards("OK", 3)
-    assertEquals("String is of acceptable size", result)
-  }
-
-  @Test
-  def whenAStringWithAnUnacceptedSizeIsPassed_ThenTheNegativeMessageIsSent(): Unit = {
-    val result = new PatternMatching().patternGuards("Not OK", 3)
-    assertEquals("String has not an acceptable size", result)
-  }
-
-  @Test
-  def whenAnObjectWhichIsNotAListOrAStringIsPassed_thenTheDefaultClauseIsUsed(): Unit = {
-    val result = new PatternMatching().patternGuards(1, 1)
-    assertEquals("Input is neither a List or a String", result)
-  }
-
-  @Test
-  def whenACardSuitIsPassed_ThenTheCorrespondingMatchCaseClauseIsUsed(): Unit = {
-    assertEquals("Card is spike", new PatternMatching().sealedClass(Spike()))
-    assertEquals("Card is club", new PatternMatching().sealedClass(Club()))
-    assertEquals("Card is heart", new PatternMatching().sealedClass(Heart()))
-    assertEquals("Card is diamond", new PatternMatching().sealedClass(Diamond()))
-  }
-
-  @Test
-  def whenAnObjectWithExtractorIsPassed_ThenTheExtractedValueIsUsedInTheCaseClause(): Unit = {
-    val person = Person("John Smith")
-    val result = new PatternMatching().extractors(person)
-    assertEquals("My initials are J. S.", result)
-  }
-
-  @Test
-  def whenAnObjectWithExtractorIsPassed_AndTheValueIsEmpty_ThenTheDefaultCaseClauseIsUsed(): Unit = {
-    val person = Person("")
-    val result = new PatternMatching().extractors(person)
-    assertEquals("Could not extract initials", result)
-  }
-
-  @Test
-  def whenAListOfRandomElementsIsPassed_ThenOnlyTheIntegersBelowTenAreReturned(): Unit = {
-    val input = List(1, 2, "5", 11, true)
-    val result = new PatternMatching().closuresPatternMatching(input)
-    assertEquals(List(1, 2), result)
-  }
-
-  @Test
-  def whenAnExceptionIsPassed_ThenTheCorrespondingMessageIsReturned(): Unit = {
-    val pm = new PatternMatching()
-
-    val iae = new IllegalArgumentException()
-    val re = new RuntimeException()
-    val fnfe = new FileNotFoundException()
-
-    assertEquals("It's an IllegalArgumentException", pm.catchBlocksPatternMatching(iae))
-    assertEquals("It's a RuntimeException", pm.catchBlocksPatternMatching(re))
-    assertEquals("It's an unknown kind of exception", pm.catchBlocksPatternMatching(fnfe))
-  }
-}
-
-

core-scala/src/test/scala/com/baeldung/scala/UtilsUnitTest.scala

@@ -1,32 +0,0 @@
-package com.baeldung.scala
-
-import com.baeldung.scala.Utils.{average, fibonacci, power, randomLessThan}
-import org.junit.Assert.{assertEquals, assertTrue}
-import org.junit.Test
-
-class UtilsUnitTest {
-
-  @Test
-  def whenAverageCalled_thenCorrectValueReturned(): Unit = {
-    assertEquals(15.0, average(10, 20), 1e-5)
-  }
-
-  @Test
-  def whenRandomLessThanInvokedWithANumber_thenARandomLessThanItReturned: Unit = {
-    val d = 0.1
-    assertTrue(randomLessThan(d) < d)
-  }
-
-  @Test
-  def whenPowerInvokedWith2And3_then8Returned: Unit = {
-    assertEquals(8, power(2, 3))
-  }
-
-  @Test
-  def whenFibonacciCalled_thenCorrectValueReturned: Unit = {
-    assertEquals(1, fibonacci(0))
-    assertEquals(1, fibonacci(1))
-    assertEquals(fibonacci(6),
-      fibonacci(4) + fibonacci(5))
-  }
-}

core-scala/src/test/scala/com/baeldung/scala/regex/RegexUnitTest.scala

@@ -1,73 +0,0 @@
-package com.baeldung.scala.regex
-
-import org.junit.Test
-import org.junit.Assert.assertEquals
-
-class RegexUnitTest {
-  private val polishPostalCode = "([0-9]{2})\\-([0-9]{3})".r
-  private val timestamp = "([0-9]{2}):([0-9]{2}):([0-9]{2}).([0-9]{3})".r
-  private val timestampUnanchored = timestamp.unanchored
-
-  @Test
-  def givenRegularExpression_whenCallingFindFirstIn_thenShouldFindCorrectMatches(): Unit = {
-    val postCode = polishPostalCode.findFirstIn("Warsaw 01-011, Jerusalem Avenue")
-    assertEquals(Some("01-011"), postCode)
-  }
-
-  @Test
-  def givenRegularExpression_whenCallingFindFirstMatchIn_thenShouldFindCorrectMatches(): Unit = {
-    val postCodes = polishPostalCode.findFirstMatchIn("Warsaw 01-011, Jerusalem Avenue")
-    assertEquals(Some("011"), for (m <- postCodes) yield m.group(2))
-  }
-
-  @Test
-  def givenRegularExpression_whenCallingFindAllIn_thenShouldFindCorrectMatches(): Unit = {
-    val postCodes = polishPostalCode.findAllIn("Warsaw 01-011, Jerusalem Avenue, Cracow 30-059, Mickiewicza Avenue")
-      .toList
-    assertEquals(List("01-011", "30-059"), postCodes)
-
-    polishPostalCode.findAllIn("Warsaw 01-011, Jerusalem Avenue, Cracow 30-059, Mickiewicza Avenue")
-  }
-
-  @Test
-  def givenRegularExpression_whenCallingFindAlMatchlIn_thenShouldFindCorrectMatches(): Unit = {
-    val postCodes = polishPostalCode.findAllMatchIn("Warsaw 01-011, Jerusalem Avenue, Cracow 30-059, Mickiewicza Avenue")
-      .toList
-    val postalDistricts = for (m <- postCodes) yield m.group(1)
-    assertEquals(List("01", "30"), postalDistricts)
-  }
-
-  @Test
-  def givenRegularExpression_whenExtractingValues_thenShouldExtractCorrectValues(): Unit = {
-    val description = "11:34:01.411" match {
-      case timestamp(hour, minutes, _, _) => s"It's $minutes minutes after $hour"
-    }
-
-    assertEquals("It's 34 minutes after 11", description)
-  }
-
-  @Test
-  def givenUnanchoredRegularExpression_whenExtractingValues_thenShouldExtractCorrectValues(): Unit = {
-    val description = "Timestamp: 11:34:01.411 error appeared" match {
-      case timestampUnanchored(hour, minutes, _, _) => s"It's $minutes minutes after $hour"
-    }
-
-    assertEquals("It's 34 minutes after 11", description)
-  }
-
-  @Test
-  def givenRegularExpression_whenCallingReplaceAllIn_thenShouldReplaceText(): Unit = {
-    val minutes = timestamp.replaceAllIn("11:34:01.311", m => m.group(2))
-
-    assertEquals("34", minutes)
-  }
-
-  @Test
-  def givenRegularExpression_whenCallingReplaceAllInWithMatcher_thenShouldReplaceText(): Unit = {
-    val secondsThatDayInTotal = timestamp.replaceAllIn("11:34:01.311", _ match {
-      case timestamp(hours, minutes, seconds, _) => s"$hours-$minutes"
-    })
-
-    assertEquals("11-34", secondsThatDayInTotal)
-  }
-}

couchbase/pom.xml

@@ -1,6 +1,8 @@
 <?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">
+<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>couchbase</artifactId>
     <version>0.1-SNAPSHOT</version>

custom-pmd/pom.xml

@@ -1,6 +1,8 @@
 <?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">
+<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.pmd</groupId>
     <artifactId>custom-pmd</artifactId>

dagger/pom.xml

@@ -1,6 +1,8 @@
 <?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">
+<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>dagger</artifactId>
     <name>dagger</name>
@@ -44,4 +46,4 @@
         <dagger.version>2.16</dagger.version>
     </properties>
 
-</project>
+</project>

data-structures/pom.xml

@@ -1,6 +1,8 @@
 <?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">
+<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>data-structures</artifactId>
     <version>0.0.1-SNAPSHOT</version>

ddd-modules/infrastructure/pom.xml

@@ -1,6 +1,8 @@
 <?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">
+<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.dddmodules.infrastructure</groupId>
     <artifactId>infrastructure</artifactId>

ddd-modules/mainapp/pom.xml

@@ -1,6 +1,8 @@
 <?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">
+<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.dddmodules.mainapp</groupId>
     <artifactId>mainapp</artifactId>

ddd-modules/ordercontext/pom.xml

@@ -1,6 +1,8 @@
 <?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">
+<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.dddmodules.ordercontext</groupId>
     <artifactId>ordercontext</artifactId>

ddd-modules/pom.xml

@@ -1,6 +1,8 @@
 <?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">
+<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.dddmodules</groupId>
     <artifactId>dddmodules</artifactId>

ddd-modules/sharedkernel/pom.xml

@@ -1,6 +1,8 @@
 <?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">
+<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.dddmodules.sharedkernel</groupId>
     <artifactId>sharedkernel</artifactId>

ddd-modules/shippingcontext/pom.xml

@@ -1,6 +1,8 @@
 <?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">
+<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.dddmodules.shippingcontext</groupId>
     <artifactId>shippingcontext</artifactId>

ddd/pom.xml

@@ -1,6 +1,8 @@
 <?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">
+<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.ddd</groupId>
     <artifactId>ddd</artifactId>
@@ -21,8 +23,8 @@
             <artifactId>spring-boot-starter-data-mongodb</artifactId>
         </dependency>
         <dependency>
-        	<groupId>org.springframework.boot</groupId>
-        	<artifactId>spring-boot-starter-data-cassandra</artifactId>
+            <groupId>org.springframework.boot</groupId>
+            <artifactId>spring-boot-starter-data-cassandra</artifactId>
         </dependency>
         <dependency>
             <groupId>org.junit.jupiter</groupId>
@@ -97,4 +99,4 @@
         <spring-boot.version>2.0.6.RELEASE</spring-boot.version>
     </properties>
 
-</project>
+</project>

deeplearning4j/pom.xml

@@ -1,6 +1,8 @@
 <?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/maven-v4_0_0.xsd">
+<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.deeplearning4j</groupId>
     <artifactId>deeplearning4j</artifactId>

disruptor/pom.xml

@@ -1,6 +1,8 @@
 <?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">
+<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>disruptor</artifactId>
     <version>0.1.0-SNAPSHOT</version>

dozer/pom.xml

@@ -1,6 +1,8 @@
 <?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/maven-v4_0_0.xsd">
+<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>
     <artifactId>dozer</artifactId>
     <version>1.0</version>

drools/pom.xml

@@ -1,6 +1,8 @@
 <?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">
+<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>drools</artifactId>
     <name>drools</name>

dropwizard/pom.xml

@@ -1,7 +1,8 @@
 <?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">
+<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>dropwizard</artifactId>
     <version>0.0.1-SNAPSHOT</version>
@@ -48,8 +49,7 @@
                         </goals>
                         <configuration>
                             <transformers>
-                                <transformer
-                                        implementation="org.apache.maven.plugins.shade.resource.ServicesResourceTransformer"/>
+                                <transformer implementation="org.apache.maven.plugins.shade.resource.ServicesResourceTransformer" />
                                 <transformer implementation="org.apache.maven.plugins.shade.resource.ManifestResourceTransformer">
                                     <mainClass>com.baeldung.dropwizard.introduction.IntroductionApplication</mainClass>
                                 </transformer>

dubbo/pom.xml

@@ -1,6 +1,8 @@
 <?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">
+<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>dubbo</artifactId>
     <name>dubbo</name>

ethereum/pom.xml

@@ -1,6 +1,8 @@
 <?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">
+<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.ethereum</groupId>
     <artifactId>ethereum</artifactId>

feign/pom.xml

@@ -1,6 +1,8 @@
 <?xml version="1.0" encoding="UTF-8"?>
-<project xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://maven.apache.org/POM/4.0.0"
-         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
+<project
+    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+    xmlns="http://maven.apache.org/POM/4.0.0"
+    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.feign</groupId>
     <artifactId>feign</artifactId>

flyway-cdi-extension/pom.xml

@@ -1,7 +1,8 @@
 <?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">
+<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>flyway-cdi-extension</artifactId>
     <version>1.0-SNAPSHOT</version>

geotools/pom.xml

@@ -1,7 +1,8 @@
 <?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">
+<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>geotools</artifactId>
     <version>0.0.1-SNAPSHOT</version>

google-cloud/pom.xml

@@ -1,6 +1,8 @@
 <?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">
+<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>google-cloud</artifactId>
     <version>0.1-SNAPSHOT</version>

google-web-toolkit/pom.xml

@@ -1,7 +1,8 @@
 <?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/maven-v4_0_0.xsd">
+<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">
     <!-- POM file generated with GWT webAppCreator -->
     <modelVersion>4.0.0</modelVersion>
     <artifactId>google-web-toolkit</artifactId>
@@ -53,8 +54,7 @@
     </dependencies>
 
     <build>
-        <!-- Output classes directly into the webapp, so that IDEs and "mvn process-classes"
-            update them in DevMode -->
+        <!-- Output classes directly into the webapp, so that IDEs and "mvn process-classes" update them in DevMode -->
         <outputDirectory>${project.build.directory}/${project.build.finalName}/WEB-INF/classes</outputDirectory>
 
         <plugins>
@@ -76,8 +76,7 @@
                     <moduleName>com.baeldung.Google_web_toolkit</moduleName>
                     <moduleShortName>Google_web_toolkit</moduleShortName>
                     <failOnError>true</failOnError>
-                    <!-- GWT compiler 2.8 requires 1.8, hence define sourceLevel here if
-                        you use a different source language for java compilation -->
+                    <!-- GWT compiler 2.8 requires 1.8, hence define sourceLevel here if you use a different source language for java compilation -->
                     <sourceLevel>${maven.compiler.source}</sourceLevel>
                     <!-- Compiler configuration -->
                     <compilerArgs>
@@ -109,9 +108,8 @@
 
     <properties>
 
-        <!-- Setting maven.compiler.source to something different to 1.8 needs
-            that you configure the sourceLevel in gwt-maven-plugin since GWT compiler
-            2.8 requires 1.8 (see gwt-maven-plugin block below) -->
+        <!-- Setting maven.compiler.source to something different to 1.8 needs that you configure the sourceLevel in gwt-maven-plugin since GWT compiler 2.8 requires 1.8 (see gwt-maven-plugin 
+            block below) -->
         <maven.compiler.source>1.8</maven.compiler.source>
         <maven.compiler.target>1.8</maven.compiler.target>
 

graphql/graphql-java/pom.xml

@@ -1,6 +1,8 @@
 <?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">
+<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.graphql</groupId>
     <artifactId>graphql-java</artifactId>

grpc/pom.xml

@@ -1,6 +1,8 @@
 <?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">
+<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>grpc</artifactId>
     <version>0.0.1-SNAPSHOT</version>

gson/pom.xml

@@ -1,7 +1,8 @@
 <?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">
+<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>gson</artifactId>
     <version>0.1-SNAPSHOT</version>

guava-collections/pom.xml

@@ -1,6 +1,8 @@
 <?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">
+<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>guava-collections</artifactId>
     <version>0.1.0-SNAPSHOT</version>

guava/pom.xml

@@ -1,6 +1,8 @@
 <?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">
+<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>guava</artifactId>
     <version>0.1.0-SNAPSHOT</version>

guice/pom.xml

@@ -1,6 +1,8 @@
 <?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">
+<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.examples.guice</groupId>
     <artifactId>guice</artifactId>

hazelcast/pom.xml

@@ -1,6 +1,8 @@
 <?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">
+<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>hazelcast</artifactId>
     <version>0.0.1-SNAPSHOT</version>
@@ -32,7 +34,7 @@
     </build>
 
     <properties>
-        <!-- hazelcast jet-->
+        <!-- hazelcast jet -->
         <hazelcast.jet.version>0.6</hazelcast.jet.version>
     </properties>
 

java-ee-8-security-api/app-auth-form-store-ldap/pom.xml

@@ -1,7 +1,8 @@
 <?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">
+<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>app-auth-form-store-ldap</artifactId>
     <name>app-auth-form-store-ldap</name>
@@ -12,10 +13,6 @@
         <artifactId>java-ee-8-security-api</artifactId>
         <version>1.0-SNAPSHOT</version>
     </parent>
-	
-    <properties>
-        <unboundid.ldapsdk.version>4.0.4</unboundid.ldapsdk.version>
-    </properties>
 
     <dependencies>
         <dependency>
@@ -52,4 +49,8 @@
         </plugins>
     </build>
 
+    <properties>
+        <unboundid.ldapsdk.version>4.0.4</unboundid.ldapsdk.version>
+    </properties>
+
 </project>

lagom/build.sbt

@@ -1,4 +1,4 @@
-organization in ThisBuild := "org.baeldung"
+organization in ThisBuild := "com.baeldung"
 
 // the Scala version that will be used for cross-compiled libraries
 scalaVersion in ThisBuild := "2.11.8"

lagom/greeting-api/src/main/java/com/baeldung/lagom/helloworld/greeting/api/GreetingService.java

@@ -1,4 +1,4 @@
-package org.baeldung.lagom.helloworld.greeting.api;
+package com.baeldung.lagom.helloworld.greeting.api;
 
 import static com.lightbend.lagom.javadsl.api.Service.named;
 import static com.lightbend.lagom.javadsl.api.Service.restCall;

lagom/greeting-api/src/main/java/com/baeldung/lagom/helloworld/greeting/impl/GreetingCommand.java

@@ -1,4 +1,4 @@
-package org.baeldung.lagom.helloworld.greeting.impl;
+package com.baeldung.lagom.helloworld.greeting.impl;
 
 import com.fasterxml.jackson.annotation.JsonCreator;
 import com.fasterxml.jackson.databind.annotation.JsonDeserialize;

lagom/greeting-api/src/main/java/com/baeldung/lagom/helloworld/greeting/impl/GreetingEntity.java

@@ -1,9 +1,9 @@
-package org.baeldung.lagom.helloworld.greeting.impl;
+package com.baeldung.lagom.helloworld.greeting.impl;
 
 import java.util.Optional;
 
-import org.baeldung.lagom.helloworld.greeting.impl.GreetingCommand.ReceivedGreetingCommand;
-import org.baeldung.lagom.helloworld.greeting.impl.GreetingEvent.ReceivedGreetingEvent;
+import com.baeldung.lagom.helloworld.greeting.impl.GreetingCommand.ReceivedGreetingCommand;
+import com.baeldung.lagom.helloworld.greeting.impl.GreetingEvent.ReceivedGreetingEvent;
 
 import com.lightbend.lagom.javadsl.persistence.PersistentEntity;
 

lagom/greeting-api/src/main/java/com/baeldung/lagom/helloworld/greeting/impl/GreetingEvent.java

@@ -1,4 +1,4 @@
-package org.baeldung.lagom.helloworld.greeting.impl;
+package com.baeldung.lagom.helloworld.greeting.impl;
 
 import com.fasterxml.jackson.annotation.JsonCreator;
 import com.lightbend.lagom.serialization.Jsonable;

lagom/greeting-api/src/main/java/com/baeldung/lagom/helloworld/greeting/impl/GreetingServiceImpl.java

@@ -1,12 +1,12 @@
-package org.baeldung.lagom.helloworld.greeting.impl;
+package com.baeldung.lagom.helloworld.greeting.impl;
 
 import java.util.concurrent.CompletableFuture;
 import java.util.concurrent.ExecutionException;
 
-import org.baeldung.lagom.helloworld.greeting.api.GreetingService;
-import org.baeldung.lagom.helloworld.greeting.impl.GreetingCommand.ReceivedGreetingCommand;
-import org.baeldung.lagom.helloworld.weather.api.WeatherService;
-import org.baeldung.lagom.helloworld.weather.api.WeatherStats;
+import com.baeldung.lagom.helloworld.greeting.api.GreetingService;
+import com.baeldung.lagom.helloworld.greeting.impl.GreetingCommand.ReceivedGreetingCommand;
+import com.baeldung.lagom.helloworld.weather.api.WeatherService;
+import com.baeldung.lagom.helloworld.weather.api.WeatherStats;
 
 import com.google.inject.Inject;
 import com.lightbend.lagom.javadsl.api.ServiceCall;

lagom/greeting-api/src/main/java/com/baeldung/lagom/helloworld/greeting/impl/GreetingServiceModule.java

@@ -1,7 +1,7 @@
-package org.baeldung.lagom.helloworld.greeting.impl;
+package com.baeldung.lagom.helloworld.greeting.impl;
 
-import org.baeldung.lagom.helloworld.greeting.api.GreetingService;
-import org.baeldung.lagom.helloworld.weather.api.WeatherService;
+import com.baeldung.lagom.helloworld.greeting.api.GreetingService;
+import com.baeldung.lagom.helloworld.weather.api.WeatherService;
 
 import com.google.inject.AbstractModule;
 import com.lightbend.lagom.javadsl.server.ServiceGuiceSupport;

lagom/greeting-api/src/main/java/com/baeldung/lagom/helloworld/greeting/impl/GreetingState.java

@@ -1,4 +1,4 @@
-package org.baeldung.lagom.helloworld.greeting.impl;
+package com.baeldung.lagom.helloworld.greeting.impl;
 
 import com.fasterxml.jackson.annotation.JsonCreator;
 import com.fasterxml.jackson.databind.annotation.JsonDeserialize;

lagom/greeting-impl/bin/application.conf

@@ -1 +1 @@
-play.modules.enabled += org.baeldung.lagom.helloworld.greeting.impl.GreetingServiceModule
+play.modules.enabled += com.baeldung.lagom.helloworld.greeting.impl.GreetingServiceModule

lagom/greeting-impl/bin/classes/application.conf

@@ -1 +1 @@
-play.modules.enabled += org.baeldung.lagom.helloworld.greeting.impl.GreetingServiceModule
+play.modules.enabled += com.baeldung.lagom.helloworld.greeting.impl.GreetingServiceModule

lagom/greeting-impl/src/main/resources/application.conf

@@ -1 +1 @@
-play.modules.enabled += org.baeldung.lagom.helloworld.greeting.impl.GreetingServiceModule
+play.modules.enabled += com.baeldung.lagom.helloworld.greeting.impl.GreetingServiceModule

lagom/weather-api/src/main/java/com/baeldung/lagom/helloworld/weather/api/WeatherService.java

@@ -1,4 +1,4 @@
-package org.baeldung.lagom.helloworld.weather.api;
+package com.baeldung.lagom.helloworld.weather.api;
 
 import static com.lightbend.lagom.javadsl.api.Service.named;
 import static com.lightbend.lagom.javadsl.api.Service.*;

lagom/weather-api/src/main/java/com/baeldung/lagom/helloworld/weather/api/WeatherStats.java

@@ -1,4 +1,4 @@
-package org.baeldung.lagom.helloworld.weather.api;
+package com.baeldung.lagom.helloworld.weather.api;
 
 import java.util.Arrays;
 import java.util.Collections;

lagom/weather-impl/bin/application.conf

@@ -1 +1 @@
-play.modules.enabled += org.baeldung.lagom.helloworld.weather.impl.WeatherServiceModule
+play.modules.enabled += com.baeldung.lagom.helloworld.weather.impl.WeatherServiceModule

lagom/weather-impl/src/main/java/com/baeldung/lagom/helloworld/weather/impl/WeatherServiceImpl.java

@@ -1,9 +1,9 @@
-package org.baeldung.lagom.helloworld.weather.impl;
+package com.baeldung.lagom.helloworld.weather.impl;
 
 import java.util.concurrent.CompletableFuture;
 
-import org.baeldung.lagom.helloworld.weather.api.WeatherService;
-import org.baeldung.lagom.helloworld.weather.api.WeatherStats;
+import com.baeldung.lagom.helloworld.weather.api.WeatherService;
+import com.baeldung.lagom.helloworld.weather.api.WeatherStats;
 
 import com.lightbend.lagom.javadsl.api.ServiceCall;
 

lagom/weather-impl/src/main/java/com/baeldung/lagom/helloworld/weather/impl/WeatherServiceModule.java

@@ -1,6 +1,6 @@
-package org.baeldung.lagom.helloworld.weather.impl;
+package com.baeldung.lagom.helloworld.weather.impl;
 
-import org.baeldung.lagom.helloworld.weather.api.WeatherService;
+import com.baeldung.lagom.helloworld.weather.api.WeatherService;
 
 import com.google.inject.AbstractModule;
 import com.lightbend.lagom.javadsl.server.ServiceGuiceSupport;

lagom/weather-impl/src/main/resources/application.conf

@@ -1 +1 @@
-play.modules.enabled += org.baeldung.lagom.helloworld.weather.impl.WeatherServiceModule
+play.modules.enabled += com.baeldung.lagom.helloworld.weather.impl.WeatherServiceModule

machine-learning/pom.xml

@@ -1,6 +1,8 @@
 <?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">
+<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>machine-learning</artifactId>
     <version>1.0-SNAPSHOT</version>
@@ -13,23 +15,6 @@
         <version>1.0.0-SNAPSHOT</version>
     </parent>
 
-    <properties>
-        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
-        <maven.compiler.source>1.7</maven.compiler.source>
-        <maven.compiler.target>1.7</maven.compiler.target>
-        <kotlin.version>1.3.50</kotlin.version>
-        <dl4j.version>0.9.1</dl4j.version>
-        <clean.plugin.version>3.1.0</clean.plugin.version>
-        <resources.plugin.version>3.0.2</resources.plugin.version>
-        <jar.plugin.version>3.0.2</jar.plugin.version>
-        <compiler.plugin.version>3.8.0</compiler.plugin.version>
-        <surefire.plugin.version>2.22.1</surefire.plugin.version>
-        <install.plugin.version>2.5.2</install.plugin.version>
-        <deploy.plugin.version>2.8.2</deploy.plugin.version>
-        <site.plugin.version>3.7.1</site.plugin.version>
-        <report.plugin.version>3.0.0</report.plugin.version>
-    </properties>
-
     <dependencies>
         <dependency>
             <groupId>org.jetbrains.kotlin</groupId>
@@ -158,4 +143,21 @@
         </plugins>
     </build>
 
+    <properties>
+        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
+        <maven.compiler.source>1.7</maven.compiler.source>
+        <maven.compiler.target>1.7</maven.compiler.target>
+        <kotlin.version>1.3.50</kotlin.version>
+        <dl4j.version>0.9.1</dl4j.version>
+        <clean.plugin.version>3.1.0</clean.plugin.version>
+        <resources.plugin.version>3.0.2</resources.plugin.version>
+        <jar.plugin.version>3.0.2</jar.plugin.version>
+        <compiler.plugin.version>3.8.0</compiler.plugin.version>
+        <surefire.plugin.version>2.22.1</surefire.plugin.version>
+        <install.plugin.version>2.5.2</install.plugin.version>
+        <deploy.plugin.version>2.8.2</deploy.plugin.version>
+        <site.plugin.version>3.7.1</site.plugin.version>
+        <report.plugin.version>3.0.0</report.plugin.version>
+    </properties>
+
 </project>

maven-all/maven-custom-plugin/usage-example/pom.xml

@@ -1,18 +1,14 @@
 <?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">
+<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>example</artifactId>
     <version>0.0.1-SNAPSHOT</version>
     <packaging>pom</packaging>
 
-    <properties>
-        <commons.lang3.version>3.9</commons.lang3.version>
-        <junit.version>4.12</junit.version>
-	</properties>
-
     <dependencies>
         <dependency>
             <groupId>org.apache.commons</groupId>
@@ -47,4 +43,9 @@
         </plugins>
     </build>
 
+    <properties>
+        <commons.lang3.version>3.9</commons.lang3.version>
+        <junit.version>4.12</junit.version>
+    </properties>
+
 </project>

maven-archetype/src/main/resources/archetype-resources/pom.xml

@@ -1,23 +1,13 @@
-<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">
+<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>${groupId}</groupId>
     <artifactId>${artifactId}</artifactId>
     <version>${version}</version>
     <packaging>war</packaging>
 
-    <properties>
-        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
-        <maven.compiler.source>1.8</maven.compiler.source>
-        <maven.compiler.target>1.8</maven.compiler.target>
-        <failOnMissingWebXml>false</failOnMissingWebXml>
-        <liberty-maven-plugin.version>${liberty-plugin-version}</liberty-maven-plugin.version>
-        <defaultHttpPort>9080</defaultHttpPort>
-        <defaultHttpsPort>9443</defaultHttpsPort>
-        <cdi.api.version>2.0</cdi.api.version>
-        <rsapi.api.version>2.1</rsapi.api.version>
-    </properties>
-
     <build>
         <finalName>${artifactId}</finalName>
         <plugins>
@@ -80,4 +70,16 @@
 
     </dependencies>
 
+    <properties>
+        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
+        <maven.compiler.source>1.8</maven.compiler.source>
+        <maven.compiler.target>1.8</maven.compiler.target>
+        <failOnMissingWebXml>false</failOnMissingWebXml>
+        <liberty-maven-plugin.version>${liberty-plugin-version}</liberty-maven-plugin.version>
+        <defaultHttpPort>9080</defaultHttpPort>
+        <defaultHttpsPort>9443</defaultHttpsPort>
+        <cdi.api.version>2.0</cdi.api.version>
+        <rsapi.api.version>2.1</rsapi.api.version>
+    </properties>
+
 </project>

maven-java-11/multimodule-maven-project/userdaomodule/pom.xml

@@ -1,6 +1,8 @@
 <?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">
+<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.userdaomodule</groupId>
     <artifactId>userdaomodule</artifactId>
@@ -14,11 +16,6 @@
         <version>1.0</version>
     </parent>
 
-    <properties>
-        <entitymodule.version>1.0</entitymodule.version>
-        <daomodule.version>1.0</daomodule.version>
-	</properties>
-
     <dependencies>
         <dependency>
             <groupId>com.baeldung.entitymodule</groupId>
@@ -37,4 +34,9 @@
         </dependency>
     </dependencies>
 
+    <properties>
+        <entitymodule.version>1.0</entitymodule.version>
+        <daomodule.version>1.0</daomodule.version>
+    </properties>
+
 </project>

ninja/pom.xml

@@ -1,6 +1,8 @@
 <?xml version="1.0" encoding="UTF-8"?>
-<project xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://maven.apache.org/POM/4.0.0"
-         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/maven-v4_0_0.xsd">
+<project
+    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+    xmlns="http://maven.apache.org/POM/4.0.0"
+    xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/maven-v4_0_0.xsd">
     <modelVersion>4.0.0</modelVersion>
 
     <artifactId>ninja</artifactId>
@@ -10,19 +12,34 @@
 
     <url>http://www.ninjaframework.org</url>
 
-    <properties>
-        <ninja.version>6.5.0</ninja.version>
-        <jetty.version>9.4.18.v20190429</jetty.version>
-        <bootstrap.version>3.3.4</bootstrap.version>
-        <jquery.version>2.1.3</jquery.version>
-        <h2.version>1.4.186</h2.version>
-        <compiler.plugin.version>3.2</compiler.plugin.version>
-        <source.version>1.8</source.version>
-        <target.version>1.8</target.version>
-        <enforcer.plugin.version>1.3.1</enforcer.plugin.version>
-        <deploy.plugin.version>2.8.2</deploy.plugin.version>
-        <shade.plugin.version>2.2</shade.plugin.version>
-    </properties>
+    <dependencies>
+        <dependency>
+            <groupId>org.webjars</groupId>
+            <artifactId>bootstrap</artifactId>
+            <version>${bootstrap.version}</version>
+        </dependency>
+        <dependency>
+            <groupId>org.webjars</groupId>
+            <artifactId>jquery</artifactId>
+            <version>${jquery.version}</version>
+        </dependency>
+        <dependency>
+            <groupId>com.h2database</groupId>
+            <artifactId>h2</artifactId>
+            <version>${h2.version}</version>
+        </dependency>
+        <dependency>
+            <groupId>org.ninjaframework</groupId>
+            <artifactId>ninja-standalone</artifactId>
+            <version>${ninja.version}</version>
+        </dependency>
+        <dependency>
+            <groupId>org.ninjaframework</groupId>
+            <artifactId>ninja-test-utilities</artifactId>
+            <version>${ninja.version}</version>
+            <scope>test</scope>
+        </dependency>
+    </dependencies>
 
     <build>
         <plugins>
@@ -131,10 +148,8 @@
                         </goals>
                         <configuration>
                             <transformers>
-                                <transformer
-                                        implementation="org.apache.maven.plugins.shade.resource.ServicesResourceTransformer"/>
-                                <transformer
-                                        implementation="org.apache.maven.plugins.shade.resource.ManifestResourceTransformer">
+                                <transformer implementation="org.apache.maven.plugins.shade.resource.ServicesResourceTransformer" />
+                                <transformer implementation="org.apache.maven.plugins.shade.resource.ManifestResourceTransformer">
                                     <mainClass>ninja.standalone.NinjaJetty</mainClass>
                                 </transformer>
                             </transformers>
@@ -161,32 +176,19 @@
             </resource>
         </resources>
     </build>
-    <dependencies>
-        <dependency>
-            <groupId>org.webjars</groupId>
-            <artifactId>bootstrap</artifactId>
-            <version>${bootstrap.version}</version>
-        </dependency>
-        <dependency>
-            <groupId>org.webjars</groupId>
-            <artifactId>jquery</artifactId>
-            <version>${jquery.version}</version>
-        </dependency>
-        <dependency>
-            <groupId>com.h2database</groupId>
-            <artifactId>h2</artifactId>
-            <version>${h2.version}</version>
-        </dependency>
-        <dependency>
-            <groupId>org.ninjaframework</groupId>
-            <artifactId>ninja-standalone</artifactId>
-            <version>${ninja.version}</version>
-        </dependency>
-        <dependency>
-            <groupId>org.ninjaframework</groupId>
-            <artifactId>ninja-test-utilities</artifactId>
-            <version>${ninja.version}</version>
-            <scope>test</scope>
-        </dependency>
-    </dependencies>
+
+    <properties>
+        <ninja.version>6.5.0</ninja.version>
+        <jetty.version>9.4.18.v20190429</jetty.version>
+        <bootstrap.version>3.3.4</bootstrap.version>
+        <jquery.version>2.1.3</jquery.version>
+        <h2.version>1.4.186</h2.version>
+        <compiler.plugin.version>3.2</compiler.plugin.version>
+        <source.version>1.8</source.version>
+        <target.version>1.8</target.version>
+        <enforcer.plugin.version>1.3.1</enforcer.plugin.version>
+        <deploy.plugin.version>2.8.2</deploy.plugin.version>
+        <shade.plugin.version>2.2</shade.plugin.version>
+    </properties>
+
 </project>

pdf/pom.xml

@@ -13,12 +13,6 @@
     </parent>
 
     <dependencies>
-        <dependency>
-            <groupId>commons-codec</groupId>
-            <artifactId>commons-codec</artifactId>
-            <version>${commons-codec.version}</version>
-        </dependency>
-    
         <dependency>
             <groupId>org.apache.pdfbox</groupId>
             <artifactId>pdfbox-tools</artifactId>
@@ -86,7 +80,6 @@
         <poi-scratchpad.version>3.15</poi-scratchpad.version>
         <batik-transcoder.version>1.8</batik-transcoder.version>
         <poi-ooxml.version>3.15</poi-ooxml.version>
-        <commons-codec.version>1.14</commons-codec.version>
     </properties>
 
 </project>

persistence-modules/hibernate-annotations/README.md

@@ -0,0 +1,10 @@
+## Hibernate Annotations
+
+This module contains articles about Hibernate Annotations.
+
+### Relevant Articles:
+- [Custom Types in Hibernate and the @Type Annotation](https://www.baeldung.com/hibernate-custom-types)
+- [@JoinColumn Annotation Explained](https://www.baeldung.com/jpa-join-column)
+- [Difference Between @JoinColumn and mappedBy](https://www.baeldung.com/jpa-joincolumn-vs-mappedby)
+- [Hibernate One to Many Annotation Tutorial](http://www.baeldung.com/hibernate-one-to-many)
+- [Hibernate @WhereJoinTable Annotation](https://www.baeldung.com/hibernate-wherejointable)

persistence-modules/hibernate-annotations/pom.xml

@@ -2,9 +2,9 @@
 <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>hibernate5-2</artifactId>
+    <artifactId>hibernate-annotations</artifactId>
     <version>0.1-SNAPSHOT</version>
-    <name>hibernate5-2</name>
+    <name>hibernate-annotations</name>
     <packaging>jar</packaging>
     <description>Hibernate tutorial illustrating the use of named parameters</description>
 
@@ -20,32 +20,6 @@
             <artifactId>hibernate-core</artifactId>
             <version>${hibernate-core.version}</version>
         </dependency>
-        <dependency>
-            <groupId>org.springframework.boot</groupId>
-            <artifactId>spring-boot-starter-web</artifactId>
-            <version>${spring-boot.version}</version>
-        </dependency>
-        <dependency>
-            <groupId>org.springframework.boot</groupId>
-            <artifactId>spring-boot-starter-thymeleaf</artifactId>
-            <version>${spring-boot.version}</version>
-        </dependency>
-        <dependency>
-            <groupId>org.springframework.boot</groupId>
-            <artifactId>spring-boot-starter-data-jpa</artifactId>
-            <version>${spring-boot.version}</version>
-            <exclusions>
-                <exclusion>
-                    <groupId>com.zaxxer</groupId>
-                    <artifactId>HikariCP</artifactId>
-                </exclusion>
-            </exclusions>
-        </dependency>
-        <dependency>
-            <groupId>org.springframework.boot</groupId>
-            <artifactId>spring-boot-starter-test</artifactId>
-            <version>${spring-boot.version}</version>
-        </dependency>
 
         <dependency>
             <groupId>com.h2database</groupId>
@@ -58,7 +32,32 @@
         	<artifactId>commons-lang3</artifactId>
         	<version>${commons.lang3.version}</version>
         </dependency>
+        
+        <dependency>
+            <groupId>org.hibernate</groupId>
+            <artifactId>hibernate-testing</artifactId>
+            <version>${hibernate-core.version}</version>
+        </dependency>
+        
+        <dependency>
+            <groupId>org.hibernate</groupId>
+            <artifactId>hibernate-spatial</artifactId>
+            <version>${hibernate-core.version}</version>
+        </dependency>
+        <dependency>
+            <groupId>org.opengeo</groupId>
+            <artifactId>geodb</artifactId>
+            <version>${geodb.version}</version>
+        </dependency>
     </dependencies>
+    
+    <repositories>
+        <repository>
+            <id>geodb-repo</id>
+            <name>GeoDB repository</name>
+            <url>http://repo.boundlessgeo.com/main/</url>
+        </repository>
+    </repositories>
 
     <properties>
         <hibernate-core.version>5.4.7.Final</hibernate-core.version>
@@ -69,6 +68,7 @@
         <hibernate.core.version>5.4.7.Final</hibernate.core.version>
         <h2.version>1.4.200</h2.version>
         <commons.lang3.version>3.8.1</commons.lang3.version>
+        <geodb.version>0.9</geodb.version>
     </properties>
 
 </project>

persistence-modules/hibernate-annotations/src/main/java/com/baeldung/hibernate/HibernateUtil.java

@@ -0,0 +1,73 @@
+package com.baeldung.hibernate;
+
+import java.io.FileInputStream;
+import java.io.IOException;
+import java.net.URL;
+import java.util.Properties;
+
+import org.apache.commons.lang3.StringUtils;
+import org.hibernate.SessionFactory;
+import org.hibernate.boot.Metadata;
+import org.hibernate.boot.MetadataSources;
+import org.hibernate.boot.registry.StandardServiceRegistryBuilder;
+import org.hibernate.service.ServiceRegistry;
+
+import com.baeldung.hibernate.joincolumn.Email;
+import com.baeldung.hibernate.joincolumn.Office;
+import com.baeldung.hibernate.joincolumn.OfficeAddress;
+
+public class HibernateUtil {
+    private static String PROPERTY_FILE_NAME;
+
+    public static SessionFactory getSessionFactory() throws IOException {
+        return getSessionFactory(null);
+    }
+
+    public static SessionFactory getSessionFactory(String propertyFileName) throws IOException {
+        PROPERTY_FILE_NAME = propertyFileName;
+        ServiceRegistry serviceRegistry = configureServiceRegistry();
+        return makeSessionFactory(serviceRegistry);
+    }
+
+    public static SessionFactory getSessionFactoryByProperties(Properties properties) throws IOException {
+        ServiceRegistry serviceRegistry = configureServiceRegistry(properties);
+        return makeSessionFactory(serviceRegistry);
+    }
+
+    private static SessionFactory makeSessionFactory(ServiceRegistry serviceRegistry) {
+        MetadataSources metadataSources = new MetadataSources(serviceRegistry);
+
+        metadataSources.addPackage("com.baeldung.hibernate.pojo");
+        metadataSources.addAnnotatedClass(com.baeldung.hibernate.joincolumn.OfficialEmployee.class);
+        metadataSources.addAnnotatedClass(Email.class);
+        metadataSources.addAnnotatedClass(Office.class);
+        metadataSources.addAnnotatedClass(OfficeAddress.class);
+
+        Metadata metadata = metadataSources.getMetadataBuilder()
+                .build();
+
+        return metadata.getSessionFactoryBuilder()
+                .build();
+
+    }
+
+    private static ServiceRegistry configureServiceRegistry() throws IOException {
+        return configureServiceRegistry(getProperties());
+    }
+
+    private static ServiceRegistry configureServiceRegistry(Properties properties) throws IOException {
+        return new StandardServiceRegistryBuilder().applySettings(properties)
+                .build();
+    }
+
+    public static Properties getProperties() throws IOException {
+        Properties properties = new Properties();
+        URL propertiesURL = Thread.currentThread()
+          .getContextClassLoader()
+          .getResource(StringUtils.defaultString(PROPERTY_FILE_NAME, "hibernate.properties"));
+        try (FileInputStream inputStream = new FileInputStream(propertiesURL.getFile())) {
+            properties.load(inputStream);
+        }
+        return properties;
+    }
+}

persistence-modules/hibernate-annotations/src/main/java/com/baeldung/hibernate/UnsupportedTenancyException.java

@@ -0,0 +1,8 @@
+package com.baeldung.hibernate;
+
+public class UnsupportedTenancyException extends Exception {
+    public UnsupportedTenancyException (String message) {
+        super(message);
+    }
+
+}