Merge pull request #17 from eugenp/master

Getting the latest updates

.gitignore

@@ -27,3 +27,5 @@ target/
 
 spring-openid/src/main/resources/application.properties
 .recommenders/
+/spring-hibernate4/nbproject/
+spring-security-openid/src/main/resources/application.properties

algorithms/src/main/java/com/baeldung/algorithms/dijkstra/Dijkstra.java

@@ -18,9 +18,7 @@ public class Dijkstra {
         while (unsettledNodes.size() != 0) {
             Node currentNode = getLowestDistanceNode(unsettledNodes);
             unsettledNodes.remove(currentNode);
-            for (Entry<Node, Integer> adjacencyPair : currentNode
+            for (Entry<Node, Integer> adjacencyPair : currentNode.getAdjacentNodes().entrySet()) {
-              .getAdjacentNodes()
-              .entrySet()) {
                 Node adjacentNode = adjacencyPair.getKey();
                 Integer edgeWeigh = adjacencyPair.getValue();
 

algorithms/src/test/java/algorithms/DijkstraAlgorithmTest.java

@@ -55,29 +55,19 @@ public class DijkstraAlgorithmTest {
         for (Node node : graph.getNodes()) {
             switch (node.getName()) {
             case "B":
-                assertTrue(node
+                assertTrue(node.getShortestPath().equals(shortestPathForNodeB));
-                  .getShortestPath()
-                  .equals(shortestPathForNodeB));
                 break;
             case "C":
-                assertTrue(node
+                assertTrue(node.getShortestPath().equals(shortestPathForNodeC));
-                  .getShortestPath()
-                  .equals(shortestPathForNodeC));
                 break;
             case "D":
-                assertTrue(node
+                assertTrue(node.getShortestPath().equals(shortestPathForNodeD));
-                  .getShortestPath()
-                  .equals(shortestPathForNodeD));
                 break;
             case "E":
-                assertTrue(node
+                assertTrue(node.getShortestPath().equals(shortestPathForNodeE));
-                  .getShortestPath()
-                  .equals(shortestPathForNodeE));
                 break;
             case "F":
-                assertTrue(node
+                assertTrue(node.getShortestPath().equals(shortestPathForNodeF));
-                  .getShortestPath()
-                  .equals(shortestPathForNodeF));
                 break;
             }
         }

annotations/annotation-processing/src/main/java/com/baeldung/annotation/processor/BuilderProcessor.java

@@ -27,17 +27,12 @@ public class BuilderProcessor extends AbstractProcessor {
 
             Set<? extends Element> annotatedElements = roundEnv.getElementsAnnotatedWith(annotation);
 
-            Map<Boolean, List<Element>> annotatedMethods = annotatedElements.stream()
+            Map<Boolean, List<Element>> annotatedMethods = annotatedElements.stream().collect(Collectors.partitioningBy(element -> ((ExecutableType) element.asType()).getParameterTypes().size() == 1 && element.getSimpleName().toString().startsWith("set")));
-                    .collect(Collectors.partitioningBy(element ->
-                            ((ExecutableType) element.asType()).getParameterTypes().size() == 1
-                                    && element.getSimpleName().toString().startsWith("set")));
 
             List<Element> setters = annotatedMethods.get(true);
             List<Element> otherMethods = annotatedMethods.get(false);
 
-            otherMethods.forEach(element ->
+            otherMethods.forEach(element -> processingEnv.getMessager().printMessage(Diagnostic.Kind.ERROR, "@BuilderProperty must be applied to a setXxx method with a single argument", element));
-                    processingEnv.getMessager().printMessage(Diagnostic.Kind.ERROR,
-                            "@BuilderProperty must be applied to a setXxx method with a single argument", element));
 
             if (setters.isEmpty()) {
                 continue;
@@ -45,11 +40,7 @@ public class BuilderProcessor extends AbstractProcessor {
 
             String className = ((TypeElement) setters.get(0).getEnclosingElement()).getQualifiedName().toString();
 
-            Map<String, String> setterMap = setters.stream().collect(Collectors.toMap(
+            Map<String, String> setterMap = setters.stream().collect(Collectors.toMap(setter -> setter.getSimpleName().toString(), setter -> ((ExecutableType) setter.asType()).getParameterTypes().get(0).toString()));
-                    setter -> setter.getSimpleName().toString(),
-                    setter -> ((ExecutableType) setter.asType())
-                            .getParameterTypes().get(0).toString()
-            ));
 
             try {
                 writeBuilderFile(className, setterMap);

annotations/annotation-user/src/test/java/com/baeldung/annotation/PersonBuilderTest.java

@@ -9,10 +9,7 @@ public class PersonBuilderTest {
     @Test
     public void whenBuildPersonWithBuilder_thenObjectHasPropertyValues() {
 
-        Person person = new PersonBuilder()
+        Person person = new PersonBuilder().setAge(25).setName("John").build();
-                .setAge(25)
-                .setName("John")
-                .build();
 
         assertEquals(25, person.getAge());
         assertEquals("John", person.getName());

apache-thrift/generated/com/baeldung/thrift/impl/CrossPlatformResource.java

@@ -0,0 +1,579 @@
+/**
+ * Autogenerated by Thrift Compiler (0.10.0)
+ *
+ * DO NOT EDIT UNLESS YOU ARE SURE THAT YOU KNOW WHAT YOU ARE DOING
+ *  @generated
+ */
+package com.baeldung.thrift.impl;
+
+@SuppressWarnings({"cast", "rawtypes", "serial", "unchecked", "unused"})
+@javax.annotation.Generated(value = "Autogenerated by Thrift Compiler (0.10.0)", date = "2017-02-01")
+public class CrossPlatformResource implements org.apache.thrift.TBase<CrossPlatformResource, CrossPlatformResource._Fields>, java.io.Serializable, Cloneable, Comparable<CrossPlatformResource> {
+  private static final org.apache.thrift.protocol.TStruct STRUCT_DESC = new org.apache.thrift.protocol.TStruct("CrossPlatformResource");
+
+  private static final org.apache.thrift.protocol.TField ID_FIELD_DESC = new org.apache.thrift.protocol.TField("id", org.apache.thrift.protocol.TType.I32, (short)1);
+  private static final org.apache.thrift.protocol.TField NAME_FIELD_DESC = new org.apache.thrift.protocol.TField("name", org.apache.thrift.protocol.TType.STRING, (short)2);
+  private static final org.apache.thrift.protocol.TField SALUTATION_FIELD_DESC = new org.apache.thrift.protocol.TField("salutation", org.apache.thrift.protocol.TType.STRING, (short)3);
+
+  private static final org.apache.thrift.scheme.SchemeFactory STANDARD_SCHEME_FACTORY = new CrossPlatformResourceStandardSchemeFactory();
+  private static final org.apache.thrift.scheme.SchemeFactory TUPLE_SCHEME_FACTORY = new CrossPlatformResourceTupleSchemeFactory();
+
+  public int id; // required
+  public java.lang.String name; // required
+  public java.lang.String salutation; // optional
+
+  /** The set of fields this struct contains, along with convenience methods for finding and manipulating them. */
+  public enum _Fields implements org.apache.thrift.TFieldIdEnum {
+    ID((short)1, "id"),
+    NAME((short)2, "name"),
+    SALUTATION((short)3, "salutation");
+
+    private static final java.util.Map<java.lang.String, _Fields> byName = new java.util.HashMap<java.lang.String, _Fields>();
+
+    static {
+      for (_Fields field : java.util.EnumSet.allOf(_Fields.class)) {
+        byName.put(field.getFieldName(), field);
+      }
+    }
+
+    /**
+     * Find the _Fields constant that matches fieldId, or null if its not found.
+     */
+    public static _Fields findByThriftId(int fieldId) {
+      switch(fieldId) {
+        case 1: // ID
+          return ID;
+        case 2: // NAME
+          return NAME;
+        case 3: // SALUTATION
+          return SALUTATION;
+        default:
+          return null;
+      }
+    }
+
+    /**
+     * Find the _Fields constant that matches fieldId, throwing an exception
+     * if it is not found.
+     */
+    public static _Fields findByThriftIdOrThrow(int fieldId) {
+      _Fields fields = findByThriftId(fieldId);
+      if (fields == null) throw new java.lang.IllegalArgumentException("Field " + fieldId + " doesn't exist!");
+      return fields;
+    }
+
+    /**
+     * Find the _Fields constant that matches name, or null if its not found.
+     */
+    public static _Fields findByName(java.lang.String name) {
+      return byName.get(name);
+    }
+
+    private final short _thriftId;
+    private final java.lang.String _fieldName;
+
+    _Fields(short thriftId, java.lang.String fieldName) {
+      _thriftId = thriftId;
+      _fieldName = fieldName;
+    }
+
+    public short getThriftFieldId() {
+      return _thriftId;
+    }
+
+    public java.lang.String getFieldName() {
+      return _fieldName;
+    }
+  }
+
+  // isset id assignments
+  private static final int __ID_ISSET_ID = 0;
+  private byte __isset_bitfield = 0;
+  private static final _Fields optionals[] = {_Fields.SALUTATION};
+  public static final java.util.Map<_Fields, org.apache.thrift.meta_data.FieldMetaData> metaDataMap;
+  static {
+    java.util.Map<_Fields, org.apache.thrift.meta_data.FieldMetaData> tmpMap = new java.util.EnumMap<_Fields, org.apache.thrift.meta_data.FieldMetaData>(_Fields.class);
+    tmpMap.put(_Fields.ID, new org.apache.thrift.meta_data.FieldMetaData("id", org.apache.thrift.TFieldRequirementType.DEFAULT, 
+        new org.apache.thrift.meta_data.FieldValueMetaData(org.apache.thrift.protocol.TType.I32)));
+    tmpMap.put(_Fields.NAME, new org.apache.thrift.meta_data.FieldMetaData("name", org.apache.thrift.TFieldRequirementType.DEFAULT, 
+        new org.apache.thrift.meta_data.FieldValueMetaData(org.apache.thrift.protocol.TType.STRING)));
+    tmpMap.put(_Fields.SALUTATION, new org.apache.thrift.meta_data.FieldMetaData("salutation", org.apache.thrift.TFieldRequirementType.OPTIONAL, 
+        new org.apache.thrift.meta_data.FieldValueMetaData(org.apache.thrift.protocol.TType.STRING)));
+    metaDataMap = java.util.Collections.unmodifiableMap(tmpMap);
+    org.apache.thrift.meta_data.FieldMetaData.addStructMetaDataMap(CrossPlatformResource.class, metaDataMap);
+  }
+
+  public CrossPlatformResource() {
+  }
+
+  public CrossPlatformResource(
+    int id,
+    java.lang.String name)
+  {
+    this();
+    this.id = id;
+    setIdIsSet(true);
+    this.name = name;
+  }
+
+  /**
+   * Performs a deep copy on <i>other</i>.
+   */
+  public CrossPlatformResource(CrossPlatformResource other) {
+    __isset_bitfield = other.__isset_bitfield;
+    this.id = other.id;
+    if (other.isSetName()) {
+      this.name = other.name;
+    }
+    if (other.isSetSalutation()) {
+      this.salutation = other.salutation;
+    }
+  }
+
+  public CrossPlatformResource deepCopy() {
+    return new CrossPlatformResource(this);
+  }
+
+  @Override
+  public void clear() {
+    setIdIsSet(false);
+    this.id = 0;
+    this.name = null;
+    this.salutation = null;
+  }
+
+  public int getId() {
+    return this.id;
+  }
+
+  public CrossPlatformResource setId(int id) {
+    this.id = id;
+    setIdIsSet(true);
+    return this;
+  }
+
+  public void unsetId() {
+    __isset_bitfield = org.apache.thrift.EncodingUtils.clearBit(__isset_bitfield, __ID_ISSET_ID);
+  }
+
+  /** Returns true if field id is set (has been assigned a value) and false otherwise */
+  public boolean isSetId() {
+    return org.apache.thrift.EncodingUtils.testBit(__isset_bitfield, __ID_ISSET_ID);
+  }
+
+  public void setIdIsSet(boolean value) {
+    __isset_bitfield = org.apache.thrift.EncodingUtils.setBit(__isset_bitfield, __ID_ISSET_ID, value);
+  }
+
+  public java.lang.String getName() {
+    return this.name;
+  }
+
+  public CrossPlatformResource setName(java.lang.String name) {
+    this.name = name;
+    return this;
+  }
+
+  public void unsetName() {
+    this.name = null;
+  }
+
+  /** Returns true if field name is set (has been assigned a value) and false otherwise */
+  public boolean isSetName() {
+    return this.name != null;
+  }
+
+  public void setNameIsSet(boolean value) {
+    if (!value) {
+      this.name = null;
+    }
+  }
+
+  public java.lang.String getSalutation() {
+    return this.salutation;
+  }
+
+  public CrossPlatformResource setSalutation(java.lang.String salutation) {
+    this.salutation = salutation;
+    return this;
+  }
+
+  public void unsetSalutation() {
+    this.salutation = null;
+  }
+
+  /** Returns true if field salutation is set (has been assigned a value) and false otherwise */
+  public boolean isSetSalutation() {
+    return this.salutation != null;
+  }
+
+  public void setSalutationIsSet(boolean value) {
+    if (!value) {
+      this.salutation = null;
+    }
+  }
+
+  public void setFieldValue(_Fields field, java.lang.Object value) {
+    switch (field) {
+    case ID:
+      if (value == null) {
+        unsetId();
+      } else {
+        setId((java.lang.Integer)value);
+      }
+      break;
+
+    case NAME:
+      if (value == null) {
+        unsetName();
+      } else {
+        setName((java.lang.String)value);
+      }
+      break;
+
+    case SALUTATION:
+      if (value == null) {
+        unsetSalutation();
+      } else {
+        setSalutation((java.lang.String)value);
+      }
+      break;
+
+    }
+  }
+
+  public java.lang.Object getFieldValue(_Fields field) {
+    switch (field) {
+    case ID:
+      return getId();
+
+    case NAME:
+      return getName();
+
+    case SALUTATION:
+      return getSalutation();
+
+    }
+    throw new java.lang.IllegalStateException();
+  }
+
+  /** Returns true if field corresponding to fieldID is set (has been assigned a value) and false otherwise */
+  public boolean isSet(_Fields field) {
+    if (field == null) {
+      throw new java.lang.IllegalArgumentException();
+    }
+
+    switch (field) {
+    case ID:
+      return isSetId();
+    case NAME:
+      return isSetName();
+    case SALUTATION:
+      return isSetSalutation();
+    }
+    throw new java.lang.IllegalStateException();
+  }
+
+  @Override
+  public boolean equals(java.lang.Object that) {
+    if (that == null)
+      return false;
+    if (that instanceof CrossPlatformResource)
+      return this.equals((CrossPlatformResource)that);
+    return false;
+  }
+
+  public boolean equals(CrossPlatformResource that) {
+    if (that == null)
+      return false;
+    if (this == that)
+      return true;
+
+    boolean this_present_id = true;
+    boolean that_present_id = true;
+    if (this_present_id || that_present_id) {
+      if (!(this_present_id && that_present_id))
+        return false;
+      if (this.id != that.id)
+        return false;
+    }
+
+    boolean this_present_name = true && this.isSetName();
+    boolean that_present_name = true && that.isSetName();
+    if (this_present_name || that_present_name) {
+      if (!(this_present_name && that_present_name))
+        return false;
+      if (!this.name.equals(that.name))
+        return false;
+    }
+
+    boolean this_present_salutation = true && this.isSetSalutation();
+    boolean that_present_salutation = true && that.isSetSalutation();
+    if (this_present_salutation || that_present_salutation) {
+      if (!(this_present_salutation && that_present_salutation))
+        return false;
+      if (!this.salutation.equals(that.salutation))
+        return false;
+    }
+
+    return true;
+  }
+
+  @Override
+  public int hashCode() {
+    int hashCode = 1;
+
+    hashCode = hashCode * 8191 + id;
+
+    hashCode = hashCode * 8191 + ((isSetName()) ? 131071 : 524287);
+    if (isSetName())
+      hashCode = hashCode * 8191 + name.hashCode();
+
+    hashCode = hashCode * 8191 + ((isSetSalutation()) ? 131071 : 524287);
+    if (isSetSalutation())
+      hashCode = hashCode * 8191 + salutation.hashCode();
+
+    return hashCode;
+  }
+
+  @Override
+  public int compareTo(CrossPlatformResource other) {
+    if (!getClass().equals(other.getClass())) {
+      return getClass().getName().compareTo(other.getClass().getName());
+    }
+
+    int lastComparison = 0;
+
+    lastComparison = java.lang.Boolean.valueOf(isSetId()).compareTo(other.isSetId());
+    if (lastComparison != 0) {
+      return lastComparison;
+    }
+    if (isSetId()) {
+      lastComparison = org.apache.thrift.TBaseHelper.compareTo(this.id, other.id);
+      if (lastComparison != 0) {
+        return lastComparison;
+      }
+    }
+    lastComparison = java.lang.Boolean.valueOf(isSetName()).compareTo(other.isSetName());
+    if (lastComparison != 0) {
+      return lastComparison;
+    }
+    if (isSetName()) {
+      lastComparison = org.apache.thrift.TBaseHelper.compareTo(this.name, other.name);
+      if (lastComparison != 0) {
+        return lastComparison;
+      }
+    }
+    lastComparison = java.lang.Boolean.valueOf(isSetSalutation()).compareTo(other.isSetSalutation());
+    if (lastComparison != 0) {
+      return lastComparison;
+    }
+    if (isSetSalutation()) {
+      lastComparison = org.apache.thrift.TBaseHelper.compareTo(this.salutation, other.salutation);
+      if (lastComparison != 0) {
+        return lastComparison;
+      }
+    }
+    return 0;
+  }
+
+  public _Fields fieldForId(int fieldId) {
+    return _Fields.findByThriftId(fieldId);
+  }
+
+  public void read(org.apache.thrift.protocol.TProtocol iprot) throws org.apache.thrift.TException {
+    scheme(iprot).read(iprot, this);
+  }
+
+  public void write(org.apache.thrift.protocol.TProtocol oprot) throws org.apache.thrift.TException {
+    scheme(oprot).write(oprot, this);
+  }
+
+  @Override
+  public java.lang.String toString() {
+    java.lang.StringBuilder sb = new java.lang.StringBuilder("CrossPlatformResource(");
+    boolean first = true;
+
+    sb.append("id:");
+    sb.append(this.id);
+    first = false;
+    if (!first) sb.append(", ");
+    sb.append("name:");
+    if (this.name == null) {
+      sb.append("null");
+    } else {
+      sb.append(this.name);
+    }
+    first = false;
+    if (isSetSalutation()) {
+      if (!first) sb.append(", ");
+      sb.append("salutation:");
+      if (this.salutation == null) {
+        sb.append("null");
+      } else {
+        sb.append(this.salutation);
+      }
+      first = false;
+    }
+    sb.append(")");
+    return sb.toString();
+  }
+
+  public void validate() throws org.apache.thrift.TException {
+    // check for required fields
+    // check for sub-struct validity
+  }
+
+  private void writeObject(java.io.ObjectOutputStream out) throws java.io.IOException {
+    try {
+      write(new org.apache.thrift.protocol.TCompactProtocol(new org.apache.thrift.transport.TIOStreamTransport(out)));
+    } catch (org.apache.thrift.TException te) {
+      throw new java.io.IOException(te);
+    }
+  }
+
+  private void readObject(java.io.ObjectInputStream in) throws java.io.IOException, java.lang.ClassNotFoundException {
+    try {
+      // it doesn't seem like you should have to do this, but java serialization is wacky, and doesn't call the default constructor.
+      __isset_bitfield = 0;
+      read(new org.apache.thrift.protocol.TCompactProtocol(new org.apache.thrift.transport.TIOStreamTransport(in)));
+    } catch (org.apache.thrift.TException te) {
+      throw new java.io.IOException(te);
+    }
+  }
+
+  private static class CrossPlatformResourceStandardSchemeFactory implements org.apache.thrift.scheme.SchemeFactory {
+    public CrossPlatformResourceStandardScheme getScheme() {
+      return new CrossPlatformResourceStandardScheme();
+    }
+  }
+
+  private static class CrossPlatformResourceStandardScheme extends org.apache.thrift.scheme.StandardScheme<CrossPlatformResource> {
+
+    public void read(org.apache.thrift.protocol.TProtocol iprot, CrossPlatformResource struct) throws org.apache.thrift.TException {
+      org.apache.thrift.protocol.TField schemeField;
+      iprot.readStructBegin();
+      while (true)
+      {
+        schemeField = iprot.readFieldBegin();
+        if (schemeField.type == org.apache.thrift.protocol.TType.STOP) { 
+          break;
+        }
+        switch (schemeField.id) {
+          case 1: // ID
+            if (schemeField.type == org.apache.thrift.protocol.TType.I32) {
+              struct.id = iprot.readI32();
+              struct.setIdIsSet(true);
+            } else { 
+              org.apache.thrift.protocol.TProtocolUtil.skip(iprot, schemeField.type);
+            }
+            break;
+          case 2: // NAME
+            if (schemeField.type == org.apache.thrift.protocol.TType.STRING) {
+              struct.name = iprot.readString();
+              struct.setNameIsSet(true);
+            } else { 
+              org.apache.thrift.protocol.TProtocolUtil.skip(iprot, schemeField.type);
+            }
+            break;
+          case 3: // SALUTATION
+            if (schemeField.type == org.apache.thrift.protocol.TType.STRING) {
+              struct.salutation = iprot.readString();
+              struct.setSalutationIsSet(true);
+            } else { 
+              org.apache.thrift.protocol.TProtocolUtil.skip(iprot, schemeField.type);
+            }
+            break;
+          default:
+            org.apache.thrift.protocol.TProtocolUtil.skip(iprot, schemeField.type);
+        }
+        iprot.readFieldEnd();
+      }
+      iprot.readStructEnd();
+
+      // check for required fields of primitive type, which can't be checked in the validate method
+      struct.validate();
+    }
+
+    public void write(org.apache.thrift.protocol.TProtocol oprot, CrossPlatformResource struct) throws org.apache.thrift.TException {
+      struct.validate();
+
+      oprot.writeStructBegin(STRUCT_DESC);
+      oprot.writeFieldBegin(ID_FIELD_DESC);
+      oprot.writeI32(struct.id);
+      oprot.writeFieldEnd();
+      if (struct.name != null) {
+        oprot.writeFieldBegin(NAME_FIELD_DESC);
+        oprot.writeString(struct.name);
+        oprot.writeFieldEnd();
+      }
+      if (struct.salutation != null) {
+        if (struct.isSetSalutation()) {
+          oprot.writeFieldBegin(SALUTATION_FIELD_DESC);
+          oprot.writeString(struct.salutation);
+          oprot.writeFieldEnd();
+        }
+      }
+      oprot.writeFieldStop();
+      oprot.writeStructEnd();
+    }
+
+  }
+
+  private static class CrossPlatformResourceTupleSchemeFactory implements org.apache.thrift.scheme.SchemeFactory {
+    public CrossPlatformResourceTupleScheme getScheme() {
+      return new CrossPlatformResourceTupleScheme();
+    }
+  }
+
+  private static class CrossPlatformResourceTupleScheme extends org.apache.thrift.scheme.TupleScheme<CrossPlatformResource> {
+
+    @Override
+    public void write(org.apache.thrift.protocol.TProtocol prot, CrossPlatformResource struct) throws org.apache.thrift.TException {
+      org.apache.thrift.protocol.TTupleProtocol oprot = (org.apache.thrift.protocol.TTupleProtocol) prot;
+      java.util.BitSet optionals = new java.util.BitSet();
+      if (struct.isSetId()) {
+        optionals.set(0);
+      }
+      if (struct.isSetName()) {
+        optionals.set(1);
+      }
+      if (struct.isSetSalutation()) {
+        optionals.set(2);
+      }
+      oprot.writeBitSet(optionals, 3);
+      if (struct.isSetId()) {
+        oprot.writeI32(struct.id);
+      }
+      if (struct.isSetName()) {
+        oprot.writeString(struct.name);
+      }
+      if (struct.isSetSalutation()) {
+        oprot.writeString(struct.salutation);
+      }
+    }
+
+    @Override
+    public void read(org.apache.thrift.protocol.TProtocol prot, CrossPlatformResource struct) throws org.apache.thrift.TException {
+      org.apache.thrift.protocol.TTupleProtocol iprot = (org.apache.thrift.protocol.TTupleProtocol) prot;
+      java.util.BitSet incoming = iprot.readBitSet(3);
+      if (incoming.get(0)) {
+        struct.id = iprot.readI32();
+        struct.setIdIsSet(true);
+      }
+      if (incoming.get(1)) {
+        struct.name = iprot.readString();
+        struct.setNameIsSet(true);
+      }
+      if (incoming.get(2)) {
+        struct.salutation = iprot.readString();
+        struct.setSalutationIsSet(true);
+      }
+    }
+  }
+
+  private static <S extends org.apache.thrift.scheme.IScheme> S scheme(org.apache.thrift.protocol.TProtocol proto) {
+    return (org.apache.thrift.scheme.StandardScheme.class.equals(proto.getScheme()) ? STANDARD_SCHEME_FACTORY : TUPLE_SCHEME_FACTORY).getScheme();
+  }
+}
+

apache-thrift/generated/com/baeldung/thrift/impl/InvalidOperationException.java

@@ -0,0 +1,472 @@
+/**
+ * Autogenerated by Thrift Compiler (0.10.0)
+ *
+ * DO NOT EDIT UNLESS YOU ARE SURE THAT YOU KNOW WHAT YOU ARE DOING
+ *  @generated
+ */
+package com.baeldung.thrift.impl;
+
+@SuppressWarnings({"cast", "rawtypes", "serial", "unchecked", "unused"})
+@javax.annotation.Generated(value = "Autogenerated by Thrift Compiler (0.10.0)", date = "2017-02-01")
+public class InvalidOperationException extends org.apache.thrift.TException implements org.apache.thrift.TBase<InvalidOperationException, InvalidOperationException._Fields>, java.io.Serializable, Cloneable, Comparable<InvalidOperationException> {
+  private static final org.apache.thrift.protocol.TStruct STRUCT_DESC = new org.apache.thrift.protocol.TStruct("InvalidOperationException");
+
+  private static final org.apache.thrift.protocol.TField CODE_FIELD_DESC = new org.apache.thrift.protocol.TField("code", org.apache.thrift.protocol.TType.I32, (short)1);
+  private static final org.apache.thrift.protocol.TField DESCRIPTION_FIELD_DESC = new org.apache.thrift.protocol.TField("description", org.apache.thrift.protocol.TType.STRING, (short)2);
+
+  private static final org.apache.thrift.scheme.SchemeFactory STANDARD_SCHEME_FACTORY = new InvalidOperationExceptionStandardSchemeFactory();
+  private static final org.apache.thrift.scheme.SchemeFactory TUPLE_SCHEME_FACTORY = new InvalidOperationExceptionTupleSchemeFactory();
+
+  public int code; // required
+  public java.lang.String description; // required
+
+  /** The set of fields this struct contains, along with convenience methods for finding and manipulating them. */
+  public enum _Fields implements org.apache.thrift.TFieldIdEnum {
+    CODE((short)1, "code"),
+    DESCRIPTION((short)2, "description");
+
+    private static final java.util.Map<java.lang.String, _Fields> byName = new java.util.HashMap<java.lang.String, _Fields>();
+
+    static {
+      for (_Fields field : java.util.EnumSet.allOf(_Fields.class)) {
+        byName.put(field.getFieldName(), field);
+      }
+    }
+
+    /**
+     * Find the _Fields constant that matches fieldId, or null if its not found.
+     */
+    public static _Fields findByThriftId(int fieldId) {
+      switch(fieldId) {
+        case 1: // CODE
+          return CODE;
+        case 2: // DESCRIPTION
+          return DESCRIPTION;
+        default:
+          return null;
+      }
+    }
+
+    /**
+     * Find the _Fields constant that matches fieldId, throwing an exception
+     * if it is not found.
+     */
+    public static _Fields findByThriftIdOrThrow(int fieldId) {
+      _Fields fields = findByThriftId(fieldId);
+      if (fields == null) throw new java.lang.IllegalArgumentException("Field " + fieldId + " doesn't exist!");
+      return fields;
+    }
+
+    /**
+     * Find the _Fields constant that matches name, or null if its not found.
+     */
+    public static _Fields findByName(java.lang.String name) {
+      return byName.get(name);
+    }
+
+    private final short _thriftId;
+    private final java.lang.String _fieldName;
+
+    _Fields(short thriftId, java.lang.String fieldName) {
+      _thriftId = thriftId;
+      _fieldName = fieldName;
+    }
+
+    public short getThriftFieldId() {
+      return _thriftId;
+    }
+
+    public java.lang.String getFieldName() {
+      return _fieldName;
+    }
+  }
+
+  // isset id assignments
+  private static final int __CODE_ISSET_ID = 0;
+  private byte __isset_bitfield = 0;
+  public static final java.util.Map<_Fields, org.apache.thrift.meta_data.FieldMetaData> metaDataMap;
+  static {
+    java.util.Map<_Fields, org.apache.thrift.meta_data.FieldMetaData> tmpMap = new java.util.EnumMap<_Fields, org.apache.thrift.meta_data.FieldMetaData>(_Fields.class);
+    tmpMap.put(_Fields.CODE, new org.apache.thrift.meta_data.FieldMetaData("code", org.apache.thrift.TFieldRequirementType.DEFAULT, 
+        new org.apache.thrift.meta_data.FieldValueMetaData(org.apache.thrift.protocol.TType.I32)));
+    tmpMap.put(_Fields.DESCRIPTION, new org.apache.thrift.meta_data.FieldMetaData("description", org.apache.thrift.TFieldRequirementType.DEFAULT, 
+        new org.apache.thrift.meta_data.FieldValueMetaData(org.apache.thrift.protocol.TType.STRING)));
+    metaDataMap = java.util.Collections.unmodifiableMap(tmpMap);
+    org.apache.thrift.meta_data.FieldMetaData.addStructMetaDataMap(InvalidOperationException.class, metaDataMap);
+  }
+
+  public InvalidOperationException() {
+  }
+
+  public InvalidOperationException(
+    int code,
+    java.lang.String description)
+  {
+    this();
+    this.code = code;
+    setCodeIsSet(true);
+    this.description = description;
+  }
+
+  /**
+   * Performs a deep copy on <i>other</i>.
+   */
+  public InvalidOperationException(InvalidOperationException other) {
+    __isset_bitfield = other.__isset_bitfield;
+    this.code = other.code;
+    if (other.isSetDescription()) {
+      this.description = other.description;
+    }
+  }
+
+  public InvalidOperationException deepCopy() {
+    return new InvalidOperationException(this);
+  }
+
+  @Override
+  public void clear() {
+    setCodeIsSet(false);
+    this.code = 0;
+    this.description = null;
+  }
+
+  public int getCode() {
+    return this.code;
+  }
+
+  public InvalidOperationException setCode(int code) {
+    this.code = code;
+    setCodeIsSet(true);
+    return this;
+  }
+
+  public void unsetCode() {
+    __isset_bitfield = org.apache.thrift.EncodingUtils.clearBit(__isset_bitfield, __CODE_ISSET_ID);
+  }
+
+  /** Returns true if field code is set (has been assigned a value) and false otherwise */
+  public boolean isSetCode() {
+    return org.apache.thrift.EncodingUtils.testBit(__isset_bitfield, __CODE_ISSET_ID);
+  }
+
+  public void setCodeIsSet(boolean value) {
+    __isset_bitfield = org.apache.thrift.EncodingUtils.setBit(__isset_bitfield, __CODE_ISSET_ID, value);
+  }
+
+  public java.lang.String getDescription() {
+    return this.description;
+  }
+
+  public InvalidOperationException setDescription(java.lang.String description) {
+    this.description = description;
+    return this;
+  }
+
+  public void unsetDescription() {
+    this.description = null;
+  }
+
+  /** Returns true if field description is set (has been assigned a value) and false otherwise */
+  public boolean isSetDescription() {
+    return this.description != null;
+  }
+
+  public void setDescriptionIsSet(boolean value) {
+    if (!value) {
+      this.description = null;
+    }
+  }
+
+  public void setFieldValue(_Fields field, java.lang.Object value) {
+    switch (field) {
+    case CODE:
+      if (value == null) {
+        unsetCode();
+      } else {
+        setCode((java.lang.Integer)value);
+      }
+      break;
+
+    case DESCRIPTION:
+      if (value == null) {
+        unsetDescription();
+      } else {
+        setDescription((java.lang.String)value);
+      }
+      break;
+
+    }
+  }
+
+  public java.lang.Object getFieldValue(_Fields field) {
+    switch (field) {
+    case CODE:
+      return getCode();
+
+    case DESCRIPTION:
+      return getDescription();
+
+    }
+    throw new java.lang.IllegalStateException();
+  }
+
+  /** Returns true if field corresponding to fieldID is set (has been assigned a value) and false otherwise */
+  public boolean isSet(_Fields field) {
+    if (field == null) {
+      throw new java.lang.IllegalArgumentException();
+    }
+
+    switch (field) {
+    case CODE:
+      return isSetCode();
+    case DESCRIPTION:
+      return isSetDescription();
+    }
+    throw new java.lang.IllegalStateException();
+  }
+
+  @Override
+  public boolean equals(java.lang.Object that) {
+    if (that == null)
+      return false;
+    if (that instanceof InvalidOperationException)
+      return this.equals((InvalidOperationException)that);
+    return false;
+  }
+
+  public boolean equals(InvalidOperationException that) {
+    if (that == null)
+      return false;
+    if (this == that)
+      return true;
+
+    boolean this_present_code = true;
+    boolean that_present_code = true;
+    if (this_present_code || that_present_code) {
+      if (!(this_present_code && that_present_code))
+        return false;
+      if (this.code != that.code)
+        return false;
+    }
+
+    boolean this_present_description = true && this.isSetDescription();
+    boolean that_present_description = true && that.isSetDescription();
+    if (this_present_description || that_present_description) {
+      if (!(this_present_description && that_present_description))
+        return false;
+      if (!this.description.equals(that.description))
+        return false;
+    }
+
+    return true;
+  }
+
+  @Override
+  public int hashCode() {
+    int hashCode = 1;
+
+    hashCode = hashCode * 8191 + code;
+
+    hashCode = hashCode * 8191 + ((isSetDescription()) ? 131071 : 524287);
+    if (isSetDescription())
+      hashCode = hashCode * 8191 + description.hashCode();
+
+    return hashCode;
+  }
+
+  @Override
+  public int compareTo(InvalidOperationException other) {
+    if (!getClass().equals(other.getClass())) {
+      return getClass().getName().compareTo(other.getClass().getName());
+    }
+
+    int lastComparison = 0;
+
+    lastComparison = java.lang.Boolean.valueOf(isSetCode()).compareTo(other.isSetCode());
+    if (lastComparison != 0) {
+      return lastComparison;
+    }
+    if (isSetCode()) {
+      lastComparison = org.apache.thrift.TBaseHelper.compareTo(this.code, other.code);
+      if (lastComparison != 0) {
+        return lastComparison;
+      }
+    }
+    lastComparison = java.lang.Boolean.valueOf(isSetDescription()).compareTo(other.isSetDescription());
+    if (lastComparison != 0) {
+      return lastComparison;
+    }
+    if (isSetDescription()) {
+      lastComparison = org.apache.thrift.TBaseHelper.compareTo(this.description, other.description);
+      if (lastComparison != 0) {
+        return lastComparison;
+      }
+    }
+    return 0;
+  }
+
+  public _Fields fieldForId(int fieldId) {
+    return _Fields.findByThriftId(fieldId);
+  }
+
+  public void read(org.apache.thrift.protocol.TProtocol iprot) throws org.apache.thrift.TException {
+    scheme(iprot).read(iprot, this);
+  }
+
+  public void write(org.apache.thrift.protocol.TProtocol oprot) throws org.apache.thrift.TException {
+    scheme(oprot).write(oprot, this);
+  }
+
+  @Override
+  public java.lang.String toString() {
+    java.lang.StringBuilder sb = new java.lang.StringBuilder("InvalidOperationException(");
+    boolean first = true;
+
+    sb.append("code:");
+    sb.append(this.code);
+    first = false;
+    if (!first) sb.append(", ");
+    sb.append("description:");
+    if (this.description == null) {
+      sb.append("null");
+    } else {
+      sb.append(this.description);
+    }
+    first = false;
+    sb.append(")");
+    return sb.toString();
+  }
+
+  public void validate() throws org.apache.thrift.TException {
+    // check for required fields
+    // check for sub-struct validity
+  }
+
+  private void writeObject(java.io.ObjectOutputStream out) throws java.io.IOException {
+    try {
+      write(new org.apache.thrift.protocol.TCompactProtocol(new org.apache.thrift.transport.TIOStreamTransport(out)));
+    } catch (org.apache.thrift.TException te) {
+      throw new java.io.IOException(te);
+    }
+  }
+
+  private void readObject(java.io.ObjectInputStream in) throws java.io.IOException, java.lang.ClassNotFoundException {
+    try {
+      // it doesn't seem like you should have to do this, but java serialization is wacky, and doesn't call the default constructor.
+      __isset_bitfield = 0;
+      read(new org.apache.thrift.protocol.TCompactProtocol(new org.apache.thrift.transport.TIOStreamTransport(in)));
+    } catch (org.apache.thrift.TException te) {
+      throw new java.io.IOException(te);
+    }
+  }
+
+  private static class InvalidOperationExceptionStandardSchemeFactory implements org.apache.thrift.scheme.SchemeFactory {
+    public InvalidOperationExceptionStandardScheme getScheme() {
+      return new InvalidOperationExceptionStandardScheme();
+    }
+  }
+
+  private static class InvalidOperationExceptionStandardScheme extends org.apache.thrift.scheme.StandardScheme<InvalidOperationException> {
+
+    public void read(org.apache.thrift.protocol.TProtocol iprot, InvalidOperationException struct) throws org.apache.thrift.TException {
+      org.apache.thrift.protocol.TField schemeField;
+      iprot.readStructBegin();
+      while (true)
+      {
+        schemeField = iprot.readFieldBegin();
+        if (schemeField.type == org.apache.thrift.protocol.TType.STOP) { 
+          break;
+        }
+        switch (schemeField.id) {
+          case 1: // CODE
+            if (schemeField.type == org.apache.thrift.protocol.TType.I32) {
+              struct.code = iprot.readI32();
+              struct.setCodeIsSet(true);
+            } else { 
+              org.apache.thrift.protocol.TProtocolUtil.skip(iprot, schemeField.type);
+            }
+            break;
+          case 2: // DESCRIPTION
+            if (schemeField.type == org.apache.thrift.protocol.TType.STRING) {
+              struct.description = iprot.readString();
+              struct.setDescriptionIsSet(true);
+            } else { 
+              org.apache.thrift.protocol.TProtocolUtil.skip(iprot, schemeField.type);
+            }
+            break;
+          default:
+            org.apache.thrift.protocol.TProtocolUtil.skip(iprot, schemeField.type);
+        }
+        iprot.readFieldEnd();
+      }
+      iprot.readStructEnd();
+
+      // check for required fields of primitive type, which can't be checked in the validate method
+      struct.validate();
+    }
+
+    public void write(org.apache.thrift.protocol.TProtocol oprot, InvalidOperationException struct) throws org.apache.thrift.TException {
+      struct.validate();
+
+      oprot.writeStructBegin(STRUCT_DESC);
+      oprot.writeFieldBegin(CODE_FIELD_DESC);
+      oprot.writeI32(struct.code);
+      oprot.writeFieldEnd();
+      if (struct.description != null) {
+        oprot.writeFieldBegin(DESCRIPTION_FIELD_DESC);
+        oprot.writeString(struct.description);
+        oprot.writeFieldEnd();
+      }
+      oprot.writeFieldStop();
+      oprot.writeStructEnd();
+    }
+
+  }
+
+  private static class InvalidOperationExceptionTupleSchemeFactory implements org.apache.thrift.scheme.SchemeFactory {
+    public InvalidOperationExceptionTupleScheme getScheme() {
+      return new InvalidOperationExceptionTupleScheme();
+    }
+  }
+
+  private static class InvalidOperationExceptionTupleScheme extends org.apache.thrift.scheme.TupleScheme<InvalidOperationException> {
+
+    @Override
+    public void write(org.apache.thrift.protocol.TProtocol prot, InvalidOperationException struct) throws org.apache.thrift.TException {
+      org.apache.thrift.protocol.TTupleProtocol oprot = (org.apache.thrift.protocol.TTupleProtocol) prot;
+      java.util.BitSet optionals = new java.util.BitSet();
+      if (struct.isSetCode()) {
+        optionals.set(0);
+      }
+      if (struct.isSetDescription()) {
+        optionals.set(1);
+      }
+      oprot.writeBitSet(optionals, 2);
+      if (struct.isSetCode()) {
+        oprot.writeI32(struct.code);
+      }
+      if (struct.isSetDescription()) {
+        oprot.writeString(struct.description);
+      }
+    }
+
+    @Override
+    public void read(org.apache.thrift.protocol.TProtocol prot, InvalidOperationException struct) throws org.apache.thrift.TException {
+      org.apache.thrift.protocol.TTupleProtocol iprot = (org.apache.thrift.protocol.TTupleProtocol) prot;
+      java.util.BitSet incoming = iprot.readBitSet(2);
+      if (incoming.get(0)) {
+        struct.code = iprot.readI32();
+        struct.setCodeIsSet(true);
+      }
+      if (incoming.get(1)) {
+        struct.description = iprot.readString();
+        struct.setDescriptionIsSet(true);
+      }
+    }
+  }
+
+  private static <S extends org.apache.thrift.scheme.IScheme> S scheme(org.apache.thrift.protocol.TProtocol proto) {
+    return (org.apache.thrift.scheme.StandardScheme.class.equals(proto.getScheme()) ? STANDARD_SCHEME_FACTORY : TUPLE_SCHEME_FACTORY).getScheme();
+  }
+}
+

apache-thrift/pom.xml

@@ -0,0 +1,68 @@
+<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+    xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
+    <modelVersion>4.0.0</modelVersion>
+    <groupId>com.baeldung</groupId>
+    <artifactId>apache-thrift</artifactId>
+    <version>0.0.1-SNAPSHOT</version>
+    <packaging>pom</packaging>
+
+    <properties>
+        <java.versin>1.8</java.versin>
+        <junit.version>4.12</junit.version>
+        <maven-compiler-plugin.version>3.6.0</maven-compiler-plugin.version>
+        <thrift.version>0.10.0</thrift.version>
+        <maven-thrift.version>0.1.11</maven-thrift.version>
+    </properties>
+
+    <dependencies>
+        <dependency>
+            <groupId>org.apache.thrift</groupId>
+            <artifactId>libthrift</artifactId>
+            <version>${thrift.version}</version>
+        </dependency>
+
+        <dependency>
+            <groupId>junit</groupId>
+            <artifactId>junit</artifactId>
+            <version>${junit.version}</version>
+            <scope>test</scope>
+        </dependency>
+
+        <dependency>
+            <groupId>org.slf4j</groupId>
+            <artifactId>slf4j-simple</artifactId>
+            <version>1.7.12</version>
+            <scope>test</scope>
+        </dependency>
+    </dependencies>
+
+    <build>
+        <defaultGoal>install</defaultGoal>
+        <plugins>
+            <plugin>
+                <groupId>org.apache.maven.plugins</groupId>
+                <artifactId>maven-compiler-plugin</artifactId>
+                <version>${maven-compiler-plugin.version}</version>
+                <configuration>
+                    <source>1.8</source>
+                    <target>1.8</target>
+                </configuration>
+            </plugin>
+            <plugin>
+                <groupId>org.codehaus.mojo</groupId>
+                <artifactId>build-helper-maven-plugin</artifactId>
+                <executions>
+                    <execution>
+                        <phase>generate-sources</phase>
+                        <goals><goal>add-source</goal></goals>
+                        <configuration>
+                            <sources>
+                                <source>generated</source>
+                            </sources>
+                        </configuration>
+                    </execution>
+                </executions>
+            </plugin>
+        </plugins>
+    </build>
+</project>

apache-thrift/src/main/java/com/baeldung/thrift/Application.java

@@ -0,0 +1,9 @@
+package com.baeldung.thrift;
+
+public class Application {
+
+    public static void main(String[] args) {
+        CrossPlatformServiceServer server = new CrossPlatformServiceServer();
+        server.start();
+    }
+}

apache-thrift/src/main/java/com/baeldung/thrift/CrossPlatformServiceClient.java

@@ -0,0 +1,41 @@
+package com.baeldung.thrift;
+
+import com.baeldung.thrift.impl.CrossPlatformService;
+
+import org.apache.thrift.TException;
+import org.apache.thrift.protocol.TBinaryProtocol;
+import org.apache.thrift.protocol.TProtocol;
+import org.apache.thrift.transport.TSocket;
+import org.apache.thrift.transport.TTransport;
+import org.apache.thrift.transport.TTransportException;
+
+public class CrossPlatformServiceClient {
+
+    public boolean ping() {
+        try {
+            TTransport transport;
+
+            transport = new TSocket("localhost", 9090);
+            transport.open();
+
+            TProtocol protocol = new TBinaryProtocol(transport);
+            CrossPlatformService.Client client = new CrossPlatformService.Client(protocol);
+
+            System.out.print("Calling remote method...");
+
+            boolean result = client.ping();
+
+            System.out.println("done.");
+
+            transport.close();
+
+            return result;
+        } catch (TTransportException e) {
+            e.printStackTrace();
+        } catch (TException x) {
+            x.printStackTrace();
+        }
+
+        return false;
+    }
+}

apache-thrift/src/main/java/com/baeldung/thrift/CrossPlatformServiceImpl.java

@@ -0,0 +1,35 @@
+package com.baeldung.thrift;
+
+import com.baeldung.thrift.impl.CrossPlatformResource;
+import com.baeldung.thrift.impl.CrossPlatformService;
+import com.baeldung.thrift.impl.InvalidOperationException;
+
+import org.apache.thrift.TException;
+
+import java.util.Collections;
+import java.util.List;
+
+public class CrossPlatformServiceImpl implements CrossPlatformService.Iface {
+
+    @Override
+    public CrossPlatformResource get(final int id) throws InvalidOperationException, TException {
+        // add some action
+        return new CrossPlatformResource();
+    }
+
+    @Override
+    public void save(final CrossPlatformResource resource) throws InvalidOperationException, TException {
+        // add some action
+    }
+
+    @Override
+    public List<CrossPlatformResource> getList() throws InvalidOperationException, TException {
+        // add some action
+        return Collections.emptyList();
+    }
+
+    @Override
+    public boolean ping() throws InvalidOperationException, TException {
+        return true;
+    }
+}

apache-thrift/src/main/java/com/baeldung/thrift/CrossPlatformServiceServer.java

@@ -0,0 +1,39 @@
+package com.baeldung.thrift;
+
+import com.baeldung.thrift.impl.CrossPlatformService;
+
+import org.apache.thrift.server.TServer;
+import org.apache.thrift.server.TSimpleServer;
+import org.apache.thrift.transport.TServerSocket;
+import org.apache.thrift.transport.TServerTransport;
+
+public class CrossPlatformServiceServer {
+
+    private TServer server;
+
+    public void start() {
+        try {
+            TServerTransport serverTransport = new TServerSocket(9090);
+            server = new TSimpleServer(new TServer.Args(serverTransport)
+                .processor(new CrossPlatformService.Processor<>(new CrossPlatformServiceImpl())));
+
+            System.out.print("Starting the server... ");
+
+            server.serve();
+
+            System.out.println("done.");
+        } catch (Exception e) {
+            e.printStackTrace();
+        }
+    }
+
+    public void stop() {
+        if (server != null && server.isServing()) {
+            System.out.print("Stopping the server... ");
+
+            server.stop();
+
+            System.out.println("done.");
+        }
+    }
+}

apache-thrift/src/main/resources/cross-platform-service.thrift

@@ -0,0 +1,24 @@
+namespace cpp com.baeldung.thrift.impl
+namespace java com.baeldung.thrift.impl
+
+exception InvalidOperationException {
+    1: i32 code,
+    2: string description
+}
+
+struct CrossPlatformResource {
+    1: i32 id,
+    2: string name,
+    3: optional string salutation
+}
+
+service CrossPlatformService {
+
+    CrossPlatformResource get(1:i32 id) throws (1:InvalidOperationException e),
+
+    void save(1:CrossPlatformResource resource) throws (1:InvalidOperationException e),
+
+    list <CrossPlatformResource> getList() throws (1:InvalidOperationException e),
+
+    bool ping() throws (1:InvalidOperationException e)
+}

apache-thrift/src/test/java/com/baeldung/thrift/CrossPlatformServiceTest.java

@@ -0,0 +1,33 @@
+package com.baeldung.thrift;
+
+import org.junit.After;
+import org.junit.Assert;
+import org.junit.Before;
+import org.junit.Test;
+
+public class CrossPlatformServiceTest {
+
+    private CrossPlatformServiceServer server = new CrossPlatformServiceServer();
+
+    @Before
+    public void setUp() {
+        new Thread(() -> server.start()).start();
+        try {
+            // wait for the server start up
+            Thread.sleep(1000);
+        } catch (InterruptedException e) {
+            e.printStackTrace();
+        }
+    }
+
+    @After
+    public void tearDown() {
+        server.stop();
+    }
+
+    @Test
+    public void ping() {
+        CrossPlatformServiceClient client = new CrossPlatformServiceClient();
+        Assert.assertTrue(client.ping());
+    }
+}

assertj/src/test/java/com/baeldung/assertj/introduction/AssertJCoreTest.java

@@ -38,8 +38,7 @@ public class AssertJCoreTest {
     public void whenCheckingForElement_thenContains() throws Exception {
         List<String> list = Arrays.asList("1", "2", "3");
 
-        assertThat(list)
+        assertThat(list).contains("1");
-                .contains("1");
     }
 
     @Test
@@ -50,12 +49,7 @@ public class AssertJCoreTest {
         assertThat(list).startsWith("1");
         assertThat(list).doesNotContainNull();
 
-        assertThat(list)
+        assertThat(list).isNotEmpty().contains("1").startsWith("1").doesNotContainNull().containsSequence("2", "3");
-                .isNotEmpty()
-                .contains("1")
-                .startsWith("1")
-                .doesNotContainNull()
-                .containsSequence("2", "3");
     }
 
     @Test
@@ -67,11 +61,7 @@ public class AssertJCoreTest {
     public void whenCheckingCharacter_thenIsUnicode() throws Exception {
         char someCharacter = 'c';
 
-        assertThat(someCharacter)
+        assertThat(someCharacter).isNotEqualTo('a').inUnicode().isGreaterThanOrEqualTo('b').isLowerCase();
-                .isNotEqualTo('a')
-                .inUnicode()
-                .isGreaterThanOrEqualTo('b')
-                .isLowerCase();
     }
 
     @Test
@@ -94,11 +84,7 @@ public class AssertJCoreTest {
         final File someFile = File.createTempFile("aaa", "bbb");
         someFile.deleteOnExit();
 
-        assertThat(someFile)
+        assertThat(someFile).exists().isFile().canRead().canWrite();
-                .exists()
-                .isFile()
-                .canRead()
-                .canWrite();
     }
 
     @Test
@@ -113,20 +99,14 @@ public class AssertJCoreTest {
     public void whenGivenMap_then() throws Exception {
         Map<Integer, String> map = Maps.newHashMap(2, "a");
 
-        assertThat(map)
+        assertThat(map).isNotEmpty().containsKey(2).doesNotContainKeys(10).contains(entry(2, "a"));
-                .isNotEmpty()
-                .containsKey(2)
-                .doesNotContainKeys(10)
-                .contains(entry(2, "a"));
     }
 
     @Test
     public void whenGivenException_then() throws Exception {
         Exception ex = new Exception("abc");
 
-        assertThat(ex)
+        assertThat(ex).hasNoCause().hasMessageEndingWith("c");
-                .hasNoCause()
-                .hasMessageEndingWith("c");
     }
 
     @Ignore // IN ORDER TO TEST, REMOVE THIS LINE
@@ -134,8 +114,6 @@ public class AssertJCoreTest {
     public void whenRunningAssertion_thenDescribed() throws Exception {
         Person person = new Person("Alex", 34);
 
-        assertThat(person.getAge())
+        assertThat(person.getAge()).as("%s's age should be equal to 100").isEqualTo(100);
-                .as("%s's age should be equal to 100")
-                .isEqualTo(100);
     }
 }

assertj/src/test/java/com/baeldung/assertj/introduction/AssertJGuavaTest.java

@@ -26,9 +26,7 @@ public class AssertJGuavaTest {
         final File temp1 = File.createTempFile("bael", "dung1");
         final File temp2 = File.createTempFile("bael", "dung2");
 
-        assertThat(Files.asByteSource(temp1))
+        assertThat(Files.asByteSource(temp1)).hasSize(0).hasSameContentAs(Files.asByteSource(temp2));
-                .hasSize(0)
-                .hasSameContentAs(Files.asByteSource(temp2));
     }
 
     @Test
@@ -37,11 +35,7 @@ public class AssertJGuavaTest {
         mmap.put(1, "one");
         mmap.put(1, "1");
 
-        assertThat(mmap)
+        assertThat(mmap).hasSize(2).containsKeys(1).contains(entry(1, "one")).contains(entry(1, "1"));
-                .hasSize(2)
-                .containsKeys(1)
-                .contains(entry(1, "one"))
-                .contains(entry(1, "1"));
     }
 
     @Test
@@ -62,31 +56,21 @@ public class AssertJGuavaTest {
         mmap2.put(1, "one");
         mmap2.put(1, "1");
 
-        assertThat(mmap1)
+        assertThat(mmap1).containsAllEntriesOf(mmap2).containsAllEntriesOf(mmap1_clone).hasSameEntriesAs(mmap1_clone);
-                .containsAllEntriesOf(mmap2)
-                .containsAllEntriesOf(mmap1_clone)
-                .hasSameEntriesAs(mmap1_clone);
     }
 
     @Test
     public void givenOptional_whenVerifyingContent_thenShouldBeEqual() throws Exception {
         final Optional<String> something = Optional.of("something");
 
-        assertThat(something)
+        assertThat(something).isPresent().extractingValue().isEqualTo("something");
-                .isPresent()
-                .extractingValue()
-                .isEqualTo("something");
     }
 
     @Test
     public void givenRange_whenVerifying_thenShouldBeCorrect() throws Exception {
         final Range<String> range = Range.openClosed("a", "g");
 
-        assertThat(range)
+        assertThat(range).hasOpenedLowerBound().isNotEmpty().hasClosedUpperBound().contains("b");
-                .hasOpenedLowerBound()
-                .isNotEmpty()
-                .hasClosedUpperBound()
-                .contains("b");
     }
 
     @Test
@@ -96,10 +80,7 @@ public class AssertJGuavaTest {
         map.put(Range.closed(0, 60), "F");
         map.put(Range.closed(61, 70), "D");
 
-        assertThat(map)
+        assertThat(map).isNotEmpty().containsKeys(0).contains(MapEntry.entry(34, "F"));
-                .isNotEmpty()
-                .containsKeys(0)
-                .contains(MapEntry.entry(34, "F"));
     }
 
     @Test
@@ -109,13 +90,7 @@ public class AssertJGuavaTest {
         table.put(1, "A", "PRESENT");
         table.put(1, "B", "ABSENT");
 
-        assertThat(table)
+        assertThat(table).hasRowCount(1).containsValues("ABSENT").containsCell(1, "B", "ABSENT");
-                .hasRowCount(1)
-                .containsValues("ABSENT")
-                .containsCell(1, "B", "ABSENT");
     }
 
-
-
-
 }

assertj/src/test/java/com/baeldung/assertj/introduction/AssertJJava8Test.java

@@ -20,20 +20,14 @@ public class AssertJJava8Test {
     public void givenOptional_shouldAssert() throws Exception {
         final Optional<String> givenOptional = Optional.of("something");
 
-        assertThat(givenOptional)
+        assertThat(givenOptional).isPresent().hasValue("something");
-          .isPresent()
-          .hasValue("something");
     }
 
     @Test
     public void givenPredicate_shouldAssert() throws Exception {
         final Predicate<String> predicate = s -> s.length() > 4;
 
-        assertThat(predicate)
+        assertThat(predicate).accepts("aaaaa", "bbbbb").rejects("a", "b").acceptsAll(asList("aaaaa", "bbbbb")).rejectsAll(asList("a", "b"));
-          .accepts("aaaaa", "bbbbb")
-          .rejects("a", "b")
-          .acceptsAll(asList("aaaaa", "bbbbb"))
-          .rejectsAll(asList("a", "b"));
     }
 
     @Test
@@ -41,74 +35,58 @@ public class AssertJJava8Test {
         final LocalDate givenLocalDate = LocalDate.of(2016, 7, 8);
         final LocalDate todayDate = LocalDate.now();
 
-        assertThat(givenLocalDate)
+        assertThat(givenLocalDate).isBefore(LocalDate.of(2020, 7, 8)).isAfterOrEqualTo(LocalDate.of(1989, 7, 8));
-          .isBefore(LocalDate.of(2020, 7, 8))
-          .isAfterOrEqualTo(LocalDate.of(1989, 7, 8));
 
-        assertThat(todayDate)
+        assertThat(todayDate).isAfter(LocalDate.of(1989, 7, 8)).isToday();
-          .isAfter(LocalDate.of(1989, 7, 8))
-          .isToday();
     }
 
     @Test
     public void givenLocalDateTime_shouldAssert() throws Exception {
         final LocalDateTime givenLocalDate = LocalDateTime.of(2016, 7, 8, 12, 0);
 
-        assertThat(givenLocalDate)
+        assertThat(givenLocalDate).isBefore(LocalDateTime.of(2020, 7, 8, 11, 2));
-          .isBefore(LocalDateTime.of(2020, 7, 8, 11, 2));
     }
 
     @Test
     public void givenLocalTime_shouldAssert() throws Exception {
         final LocalTime givenLocalTime = LocalTime.of(12, 15);
 
-        assertThat(givenLocalTime)
+        assertThat(givenLocalTime).isAfter(LocalTime.of(1, 0)).hasSameHourAs(LocalTime.of(12, 0));
-          .isAfter(LocalTime.of(1, 0))
-          .hasSameHourAs(LocalTime.of(12, 0));
     }
 
     @Test
     public void givenList_shouldAssertFlatExtracting() throws Exception {
         final List<LocalDate> givenList = asList(ofYearDay(2016, 5), ofYearDay(2015, 6));
 
-        assertThat(givenList)
+        assertThat(givenList).flatExtracting(LocalDate::getYear).contains(2015);
-          .flatExtracting(LocalDate::getYear)
-          .contains(2015);
     }
 
     @Test
     public void givenList_shouldAssertFlatExtractingLeapYear() throws Exception {
         final List<LocalDate> givenList = asList(ofYearDay(2016, 5), ofYearDay(2015, 6));
 
-        assertThat(givenList)
+        assertThat(givenList).flatExtracting(LocalDate::isLeapYear).contains(true);
-          .flatExtracting(LocalDate::isLeapYear)
-          .contains(true);
     }
 
     @Test
     public void givenList_shouldAssertFlatExtractingClass() throws Exception {
         final List<LocalDate> givenList = asList(ofYearDay(2016, 5), ofYearDay(2015, 6));
 
-        assertThat(givenList)
+        assertThat(givenList).flatExtracting(Object::getClass).contains(LocalDate.class);
-          .flatExtracting(Object::getClass)
-          .contains(LocalDate.class);
     }
 
     @Test
     public void givenList_shouldAssertMultipleFlatExtracting() throws Exception {
         final List<LocalDate> givenList = asList(ofYearDay(2016, 5), ofYearDay(2015, 6));
 
-        assertThat(givenList)
+        assertThat(givenList).flatExtracting(LocalDate::getYear, LocalDate::getDayOfMonth).contains(2015, 6);
-          .flatExtracting(LocalDate::getYear, LocalDate::getDayOfMonth)
-          .contains(2015, 6);
     }
 
     @Test
     public void givenString_shouldSatisfy() throws Exception {
         final String givenString = "someString";
 
-        assertThat(givenString)
+        assertThat(givenString).satisfies(s -> {
-          .satisfies(s -> {
             assertThat(s).isNotEmpty();
             assertThat(s).hasSize(10);
         });
@@ -118,15 +96,13 @@ public class AssertJJava8Test {
     public void givenString_shouldMatch() throws Exception {
         final String emptyString = "";
 
-        assertThat(emptyString)
+        assertThat(emptyString).matches(String::isEmpty);
-          .matches(String::isEmpty);
     }
 
     @Test
     public void givenList_shouldHasOnlyOneElementSatisfying() throws Exception {
         final List<String> givenList = Arrays.asList("");
 
-        assertThat(givenList)
+        assertThat(givenList).hasOnlyOneElementSatisfying(s -> assertThat(s).isEmpty());
-          .hasOnlyOneElementSatisfying(s -> assertThat(s).isEmpty());
     }
 }

autovalue/src/main/java/com/baeldung/autovalue/ImmutableMoney.java

@@ -1,18 +1,20 @@
 package com.baeldung.autovalue;
+
 public final class ImmutableMoney {
     private final long amount;
     private final String currency;
+
     public ImmutableMoney(long amount, String currency) {
         this.amount = amount;
         this.currency = currency;
     }
+
     @Override
     public int hashCode() {
         final int prime = 31;
         int result = 1;
         result = prime * result + (int) (amount ^ (amount >>> 32));
-		result = prime * result
+        result = prime * result + ((currency == null) ? 0 : currency.hashCode());
-				+ ((currency == null) ? 0 : currency.hashCode());
         return result;
     }
 
@@ -45,8 +47,7 @@ public final class ImmutableMoney {
 
     @Override
     public String toString() {
-		return "ImmutableMoney [amount=" + amount + ", currency=" + currency
+        return "ImmutableMoney [amount=" + amount + ", currency=" + currency + "]";
-				+ "]";
     }
 
 }

autovalue/src/main/java/com/baeldung/autovalue/MutableMoney.java

@@ -3,8 +3,7 @@ package com.baeldung.autovalue;
 public class MutableMoney {
     @Override
     public String toString() {
-		return "MutableMoney [amount=" + amount + ", currency=" + currency
+        return "MutableMoney [amount=" + amount + ", currency=" + currency + "]";
-				+ "]";
     }
 
     public long getAmount() {

autovalue/src/test/java/com/baeldung/autovalue/MoneyUnitTest.java

@@ -32,24 +32,28 @@ public class MoneyUnitTest {
         AutoValueMoney m2 = AutoValueMoney.create("USD", 5000);
         assertTrue(m1.equals(m2));
     }
+
     @Test
     public void given2DifferentValueTypesWithAutoValue_whenNotEqual_thenCorrect() {
         AutoValueMoney m1 = AutoValueMoney.create("GBP", 5000);
         AutoValueMoney m2 = AutoValueMoney.create("USD", 5000);
         assertFalse(m1.equals(m2));
     }
+
     @Test
     public void given2EqualValueTypesWithBuilder_whenEqual_thenCorrect() {
         AutoValueMoneyWithBuilder m1 = AutoValueMoneyWithBuilder.builder().setAmount(5000).setCurrency("USD").build();
         AutoValueMoneyWithBuilder m2 = AutoValueMoneyWithBuilder.builder().setAmount(5000).setCurrency("USD").build();
         assertTrue(m1.equals(m2));
     }
+
     @Test
     public void given2DifferentValueTypesBuilder_whenNotEqual_thenCorrect() {
         AutoValueMoneyWithBuilder m1 = AutoValueMoneyWithBuilder.builder().setAmount(5000).setCurrency("USD").build();
         AutoValueMoneyWithBuilder m2 = AutoValueMoneyWithBuilder.builder().setAmount(5000).setCurrency("GBP").build();
         assertFalse(m1.equals(m2));
     }
+
     @Test
     public void givenValueTypeWithBuilder_whenFieldsCorrectlySet_thenCorrect() {
         AutoValueMoneyWithBuilder m = AutoValueMoneyWithBuilder.builder().setAmount(5000).setCurrency("USD").build();

core-java-9/pom.xml

@@ -57,7 +57,6 @@
                 <configuration>
                     <source>1.9</source>
                     <target>1.9</target>
-                    <verbose>true</verbose>
                 </configuration>
             </plugin>
 
@@ -72,6 +71,9 @@
     </build>
 
     <properties>
+        <!-- project build encoding -->
+        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
+    
         <!-- logging -->
         <org.slf4j.version>1.7.21</org.slf4j.version>
 

core-java-9/src/main/java/com/baeldung/java9/process/ProcessUtils.java

@@ -8,7 +8,6 @@ import java.time.Duration;
 import java.time.Instant;
 import java.util.stream.Stream;
 
-
 public class ProcessUtils {
 
     public static String getClassPath() {

core-java-9/src/main/java/com/baeldung/java9/process/ServiceMain.java

@@ -8,7 +8,6 @@ public class ServiceMain {
         ProcessHandle thisProcess = ProcessHandle.current();
         long pid = thisProcess.getPid();
 
-        
         Optional<String[]> opArgs = Optional.ofNullable(args);
         String procName = opArgs.map(str -> str.length > 0 ? str[0] : null).orElse(System.getProperty("sun.java.command"));
 

core-java-9/src/test/java/com/baeldung/java9/Java9OptionalsStreamTest.java

@@ -19,10 +19,7 @@ public class Java9OptionalsStreamTest {
     public void filterOutPresentOptionalsWithFilter() {
         assertEquals(4, listOfOptionals.size());
 
-        List<String> filteredList = listOfOptionals.stream()
+        List<String> filteredList = listOfOptionals.stream().filter(Optional::isPresent).map(Optional::get).collect(Collectors.toList());
-          .filter(Optional::isPresent)
-          .map(Optional::get)
-          .collect(Collectors.toList());
 
         assertEquals(2, filteredList.size());
         assertEquals("foo", filteredList.get(0));
@@ -33,9 +30,7 @@ public class Java9OptionalsStreamTest {
     public void filterOutPresentOptionalsWithFlatMap() {
         assertEquals(4, listOfOptionals.size());
 
-        List<String> filteredList = listOfOptionals.stream()
+        List<String> filteredList = listOfOptionals.stream().flatMap(o -> o.isPresent() ? Stream.of(o.get()) : Stream.empty()).collect(Collectors.toList());
-          .flatMap(o -> o.isPresent() ? Stream.of(o.get()) : Stream.empty())
-          .collect(Collectors.toList());
         assertEquals(2, filteredList.size());
 
         assertEquals("foo", filteredList.get(0));
@@ -46,9 +41,7 @@ public class Java9OptionalsStreamTest {
     public void filterOutPresentOptionalsWithFlatMap2() {
         assertEquals(4, listOfOptionals.size());
 
-        List<String> filteredList = listOfOptionals.stream()
+        List<String> filteredList = listOfOptionals.stream().flatMap(o -> o.map(Stream::of).orElseGet(Stream::empty)).collect(Collectors.toList());
-          .flatMap(o -> o.map(Stream::of).orElseGet(Stream::empty))
-          .collect(Collectors.toList());
         assertEquals(2, filteredList.size());
 
         assertEquals("foo", filteredList.get(0));
@@ -59,9 +52,7 @@ public class Java9OptionalsStreamTest {
     public void filterOutPresentOptionalsWithJava9() {
         assertEquals(4, listOfOptionals.size());
 
-        List<String> filteredList = listOfOptionals.stream()
+        List<String> filteredList = listOfOptionals.stream().flatMap(Optional::stream).collect(Collectors.toList());
-          .flatMap(Optional::stream)
-          .collect(Collectors.toList());
 
         assertEquals(2, filteredList.size());
         assertEquals("foo", filteredList.get(0));

core-java-9/src/test/java/com/baeldung/java9/MultiResultionImageTest.java

@@ -13,7 +13,6 @@ import org.junit.Test;
 
 public class MultiResultionImageTest {
 
-
     @Test
     public void baseMultiResImageTest() {
         int baseIndex = 1;
@@ -38,10 +37,8 @@ public class MultiResultionImageTest {
         return 8 * (i + 1);
     }
 
-
     private static BufferedImage createImage(int i) {
-        return new BufferedImage(getSize(i), getSize(i),
+        return new BufferedImage(getSize(i), getSize(i), BufferedImage.TYPE_INT_RGB);
-                BufferedImage.TYPE_INT_RGB);
     }
 
 }

core-java-9/src/test/java/com/baeldung/java9/httpclient/SimpleHttpRequestsTest.java

@@ -1,7 +1,5 @@
 package com.baeldung.java9.httpclient;
 
-
-
 import static java.net.HttpURLConnection.HTTP_OK;
 import static org.junit.Assert.assertTrue;
 
@@ -117,7 +115,9 @@ public class SimpleHttpRequestsTest {
             sb.append(k).append(":");
             List<String> l = hMap.get(k);
             if (l != null) {
-               l.forEach( s -> { sb.append(s).append(","); } );
+                l.forEach(s -> {
+                    sb.append(s).append(",");
+                });
             }
             sb.append("\n");
         }

core-java-9/src/test/java/com/baeldung/java9/language/TryWithResourcesTest.java

@@ -57,7 +57,6 @@ public class TryWithResourcesTest {
         assertEquals("Expected and Actual does not match", 5, closeCount);
     }
 
-
     static class CloseableException extends Exception implements AutoCloseable {
         @Override
         public void close() {
@@ -66,5 +65,3 @@ public class TryWithResourcesTest {
     }
 
 }
-
-

core-java-9/src/test/java/com/baeldung/java9/language/collections/ListFactoryMethodsTest.java

@@ -0,0 +1,61 @@
+package com.baeldung.java9.language.collections;
+
+import java.util.ArrayList;
+import java.util.List;
+
+import org.junit.Test;
+
+import static org.junit.Assert.assertArrayEquals;
+import static org.junit.Assert.assertEquals;
+import static org.junit.Assert.assertFalse;
+
+public class ListFactoryMethodsTest {
+
+    @Test
+    public void whenListCreated_thenSuccess() {
+        List<String> traditionlList = new ArrayList<String>();
+        traditionlList.add("foo");
+        traditionlList.add("bar");
+        traditionlList.add("baz");
+        List<String> factoryCreatedList = List.of("foo", "bar", "baz");
+        assertEquals(traditionlList, factoryCreatedList);
+    }
+
+    @Test(expected = UnsupportedOperationException.class)
+    public void onElemAdd_ifUnSupportedOpExpnThrown_thenSuccess() {
+        List<String> list = List.of("foo", "bar");
+        list.add("baz");
+    }
+
+    @Test(expected = UnsupportedOperationException.class)
+    public void onElemModify_ifUnSupportedOpExpnThrown_thenSuccess() {
+        List<String> list = List.of("foo", "bar");
+        list.set(0, "baz");
+    }
+
+    @Test(expected = UnsupportedOperationException.class)
+    public void onElemRemove_ifUnSupportedOpExpnThrown_thenSuccess() {
+        List<String> list = List.of("foo", "bar");
+        list.remove("foo");
+    }
+
+    @Test(expected = NullPointerException.class)
+    public void onNullElem_ifNullPtrExpnThrown_thenSuccess() {
+        List.of("foo", "bar", null);
+    }
+
+    @Test
+    public void ifNotArrayList_thenSuccess() {
+        List<String> list = List.of("foo", "bar");
+        assertFalse(list instanceof ArrayList);
+    }
+
+    @Test
+    public void ifListSizeIsOne_thenSuccess() {
+        int[] arr = { 1, 2, 3, 4 };
+        List<int[]> list = List.of(arr);
+        assertEquals(1, list.size());
+        assertArrayEquals(arr, list.get(0));
+    }
+
+}

core-java-9/src/test/java/com/baeldung/java9/language/collections/MapFactoryMethodsTest.java

@@ -0,0 +1,62 @@
+package com.baeldung.java9.language.collections;
+
+import java.util.HashMap;
+import java.util.Map;
+
+import org.junit.Test;
+
+import static org.junit.Assert.assertEquals;
+import static org.junit.Assert.assertFalse;
+
+public class MapFactoryMethodsTest {
+
+    @Test
+    public void whenMapCreated_thenSuccess() {
+        Map<String, String> traditionlMap = new HashMap<String, String>();
+        traditionlMap.put("foo", "a");
+        traditionlMap.put("bar", "b");
+        traditionlMap.put("baz", "c");
+        Map<String, String> factoryCreatedMap = Map.of("foo", "a", "bar", "b", "baz", "c");
+        assertEquals(traditionlMap, factoryCreatedMap);
+    }
+
+    @Test(expected = UnsupportedOperationException.class)
+    public void onElemAdd_ifUnSupportedOpExpnThrown_thenSuccess() {
+        Map<String, String> map = Map.of("foo", "a", "bar", "b");
+        map.put("baz", "c");
+    }
+
+    @Test(expected = UnsupportedOperationException.class)
+    public void onElemModify_ifUnSupportedOpExpnThrown_thenSuccess() {
+        Map<String, String> map = Map.of("foo", "a", "bar", "b");
+        map.put("foo", "c");
+    }
+
+    @Test(expected = UnsupportedOperationException.class)
+    public void onElemRemove_ifUnSupportedOpExpnThrown_thenSuccess() {
+        Map<String, String> map = Map.of("foo", "a", "bar", "b");
+        map.remove("foo");
+    }
+
+    @Test(expected = IllegalArgumentException.class)
+    public void givenDuplicateKeys_ifIllegalArgExp_thenSuccess() {
+        Map.of("foo", "a", "foo", "b");
+    }
+
+    @Test(expected = NullPointerException.class)
+    public void onNullKey_ifNullPtrExp_thenSuccess() {
+        Map.of("foo", "a", null, "b");
+    }
+
+    @Test(expected = NullPointerException.class)
+    public void onNullValue_ifNullPtrExp_thenSuccess() {
+        Map.of("foo", "a", "bar", null);
+    }
+
+    @Test
+    public void ifNotHashMap_thenSuccess() {
+        Map<String, String> map = Map.of("foo", "a", "bar", "b");
+        assertFalse(map instanceof HashMap);
+    }
+
+}

core-java-9/src/test/java/com/baeldung/java9/language/collections/SetFactoryMethodsTest.java

@@ -0,0 +1,60 @@
+package com.baeldung.java9.language.collections;
+
+import java.util.HashSet;
+import java.util.Set;
+
+import org.junit.Test;
+
+import static org.junit.Assert.assertArrayEquals;
+import static org.junit.Assert.assertEquals;
+import static org.junit.Assert.assertFalse;
+
+public class SetFactoryMethodsTest {
+
+    @Test
+    public void whenSetCreated_thenSuccess() {
+        Set<String> traditionlSet = new HashSet<String>();
+        traditionlSet.add("foo");
+        traditionlSet.add("bar");
+        traditionlSet.add("baz");
+        Set<String> factoryCreatedSet = Set.of("foo", "bar", "baz");
+        assertEquals(traditionlSet, factoryCreatedSet);
+    }
+
+    @Test(expected = IllegalArgumentException.class)
+    public void onDuplicateElem_IfIllegalArgExp_thenSuccess() {
+        Set.of("foo", "bar", "baz", "foo");
+    }
+
+    @Test(expected = UnsupportedOperationException.class)
+    public void onElemAdd_ifUnSupportedOpExpnThrown_thenSuccess() {
+        Set<String> set = Set.of("foo", "bar");
+        set.add("baz");
+    }
+
+    @Test(expected = UnsupportedOperationException.class)
+    public void onElemRemove_ifUnSupportedOpExpnThrown_thenSuccess() {
+        Set<String> set = Set.of("foo", "bar", "baz");
+        set.remove("foo");
+    }
+
+    @Test(expected = NullPointerException.class)
+    public void onNullElem_ifNullPtrExpnThrown_thenSuccess() {
+        Set.of("foo", "bar", null);
+    }
+
+    @Test
+    public void ifNotHashSet_thenSuccess() {
+        Set<String> list = Set.of("foo", "bar");
+        assertFalse(list instanceof HashSet);
+    }
+
+    @Test
+    public void ifSetSizeIsOne_thenSuccess() {
+        int[] arr = { 1, 2, 3, 4 };
+        Set<int[]> set = Set.of(arr);
+        assertEquals(1, set.size());
+        assertArrayEquals(arr, set.iterator().next());
+    }
+
+}

core-java-9/src/test/java/com/baeldung/java9/language/stream/CollectorImprovementTest.java

@@ -0,0 +1,61 @@
+package com.baeldung.java9.language.stream;
+
+import org.junit.Test;
+
+import java.util.*;
+import java.util.stream.Collectors;
+import java.util.function.Function;
+
+import static org.junit.Assert.assertEquals;
+
+public class CollectorImprovementTest {
+    @Test
+    public void givenList_whenSatifyPredicate_thenMapValueWithOccurences() {
+        List<Integer> numbers = List.of(1, 2, 3, 5, 5);
+
+        Map<Integer, Long> result = numbers.stream().filter(val -> val > 3).collect(Collectors.groupingBy(Function.identity(), Collectors.counting()));
+
+        assertEquals(1, result.size());
+
+        result = numbers.stream().collect(Collectors.groupingBy(Function.identity(), Collectors.filtering(val -> val > 3, Collectors.counting())));
+
+        assertEquals(4, result.size());
+    }
+
+    @Test
+    public void givenListOfBlogs_whenAuthorName_thenMapAuthorWithComments() {
+        Blog blog1 = new Blog("1", "Nice", "Very Nice");
+        Blog blog2 = new Blog("2", "Disappointing", "Ok", "Could be better");
+        List<Blog> blogs = List.of(blog1, blog2);
+
+        Map<String, List<List<String>>> authorComments1 = blogs.stream().collect(Collectors.groupingBy(Blog::getAuthorName, Collectors.mapping(Blog::getComments, Collectors.toList())));
+
+        assertEquals(2, authorComments1.size());
+        assertEquals(2, authorComments1.get("1").get(0).size());
+        assertEquals(3, authorComments1.get("2").get(0).size());
+
+        Map<String, List<String>> authorComments2 = blogs.stream().collect(Collectors.groupingBy(Blog::getAuthorName, Collectors.flatMapping(blog -> blog.getComments().stream(), Collectors.toList())));
+
+        assertEquals(2, authorComments2.size());
+        assertEquals(2, authorComments2.get("1").size());
+        assertEquals(3, authorComments2.get("2").size());
+    }
+}
+
+class Blog {
+    private String authorName;
+    private List<String> comments;
+
+    public Blog(String authorName, String... comments) {
+        this.authorName = authorName;
+        this.comments = List.of(comments);
+    }
+
+    public String getAuthorName() {
+        return this.authorName;
+    }
+
+    public List<String> getComments() {
+        return this.comments;
+    }
+}

core-java-9/src/test/java/com/baeldung/java9/language/stream/StreamFeaturesTest.java

@@ -17,16 +17,11 @@ public class StreamFeaturesTest {
     public static class TakeAndDropWhileTest {
 
         public Stream<String> getStreamAfterTakeWhileOperation() {
-            return Stream
+            return Stream.iterate("", s -> s + "s").takeWhile(s -> s.length() < 10);
-                    .iterate("", s -> s + "s")
-                    .takeWhile(s -> s.length() < 10);
         }
 
         public Stream<String> getStreamAfterDropWhileOperation() {
-            return Stream
+            return Stream.iterate("", s -> s + "s").takeWhile(s -> s.length() < 10).dropWhile(s -> !s.contains("sssss"));
-                    .iterate("", s -> s + "s")
-                    .takeWhile(s -> s.length() < 10)
-                    .dropWhile(s -> !s.contains("sssss"));
         }
 
         @Test
@@ -75,19 +70,19 @@ public class StreamFeaturesTest {
     public static class OfNullableTest {
 
         private List<String> collection = Arrays.asList("A", "B", "C");
-        private Map<String, Integer> map = new HashMap<>() {{
+        private Map<String, Integer> map = new HashMap<>() {
+            {
                 put("A", 10);
                 put("C", 30);
-        }};
+            }
+        };
 
         private Stream<Integer> getStreamWithOfNullable() {
-            return collection.stream()
+            return collection.stream().flatMap(s -> Stream.ofNullable(map.get(s)));
-                    .flatMap(s -> Stream.ofNullable(map.get(s)));
         }
 
         private Stream<Integer> getStream() {
-            return collection.stream()
+            return collection.stream().flatMap(s -> {
-                            .flatMap(s -> {
                 Integer temp = map.get(s);
                 return temp != null ? Stream.of(temp) : Stream.empty();
             });
@@ -107,10 +102,7 @@ public class StreamFeaturesTest {
         @Test
         public void testOfNullable() {
 
-            assertEquals(
+            assertEquals(testOfNullableFrom(getStream()), testOfNullableFrom(getStreamWithOfNullable()));
-                    testOfNullableFrom(getStream()),
-                    testOfNullableFrom(getStreamWithOfNullable())
-            );
 
         }
 

core-java-9/src/test/java/com/baeldung/java9/process/ProcessApi.java

@@ -22,7 +22,6 @@ import static org.junit.Assert.assertTrue;
 
 public class ProcessApi {
 
-
     @Before
     public void init() {
 

core-java/README.md

@@ -54,3 +54,6 @@
 - [The Basics of Java Generics](http://www.baeldung.com/java-generics)
 - [The Traveling Salesman Problem in Java](http://www.baeldung.com/java-simulated-annealing-for-traveling-salesman)
 - [How to Create an Executable JAR with Maven](http://www.baeldung.com/executable-jar-with-maven)
+- [Guide to java.util.concurrent.Future](http://www.baeldung.com/java-future)
+- [Guide to java.util.concurrent.BlockingQueue](http://www.baeldung.com/java-blocking-queue)
+- [Guide to CountDownLatch in Java](http://www.baeldung.com/java-countdown-latch)

core-java/pom.xml

@@ -64,11 +64,6 @@
             <version>${grep4j.version}</version>
         </dependency>
         
-        <dependency>
-            <groupId>com.lmax</groupId>
-            <artifactId>disruptor</artifactId>
-            <version>${disruptor.version}</version>
-        </dependency>
         <!-- web -->
 
         <!-- marshalling -->
@@ -369,7 +364,6 @@
         <unix4j.version>0.4</unix4j.version>
         <grep4j.version>1.8.7</grep4j.version>
         <lombok.version>1.16.12</lombok.version>
-        <disruptor.version>3.3.6</disruptor.version>
 
         <!-- testing -->
         <org.hamcrest.version>1.3</org.hamcrest.version>

core-java/src/main/java/com/baeldung/algorithms/RunAlgorithm.java

@@ -15,8 +15,7 @@ public class RunAlgorithm {
         int decision = in.nextInt();
         switch (decision) {
         case 1:
-			System.out.println(
+            System.out.println("Optimized distance for travel: " + SimulatedAnnealing.simulateAnnealing(10, 10000, 0.9995));
-					"Optimized distance for travel: " + SimulatedAnnealing.simulateAnnealing(10, 10000, 0.9995));
             break;
         case 2:
             SlopeOne.slopeOne(3);

core-java/src/main/java/com/baeldung/algorithms/slope_one/InputData.java

@@ -12,8 +12,7 @@ import lombok.Data;
 @Data
 public class InputData {
 
-	protected static List<Item> items = Arrays.asList(new Item("Candy"), new Item("Drink"), new Item("Soda"), new Item("Popcorn"),
+    protected static List<Item> items = Arrays.asList(new Item("Candy"), new Item("Drink"), new Item("Soda"), new Item("Popcorn"), new Item("Snacks"));
-			new Item("Snacks"));
 
     public static Map<User, HashMap<Item, Double>> initializeData(int numberOfUsers) {
         Map<User, HashMap<Item, Double>> data = new HashMap<>();

core-java/src/main/java/com/baeldung/chainedexception/LogWithChain.java

@@ -23,8 +23,7 @@ public class LogWithChain {
         try {
             howIsManager();
         } catch (ManagerUpsetException e) {
-            throw new TeamLeadUpsetException(
+            throw new TeamLeadUpsetException("Team lead is not in good mood", e);
-                    "Team lead is not in good mood", e);
         }
     }
 
@@ -36,9 +35,7 @@ public class LogWithChain {
         }
     }
 
-    private static void howIsGirlFriendOfManager()
+    private static void howIsGirlFriendOfManager() throws GirlFriendOfManagerUpsetException {
-            throws GirlFriendOfManagerUpsetException {
+        throw new GirlFriendOfManagerUpsetException("Girl friend of manager is in bad mood");
-        throw new GirlFriendOfManagerUpsetException(
-                "Girl friend of manager is in bad mood");
     }
 }

core-java/src/main/java/com/baeldung/chainedexception/LogWithoutChain.java

@@ -25,8 +25,7 @@ public class LogWithoutChain {
             howIsManager();
         } catch (ManagerUpsetException e) {
             e.printStackTrace();
-            throw new TeamLeadUpsetException(
+            throw new TeamLeadUpsetException("Team lead is not in good mood");
-                    "Team lead is not in good mood");
         }
     }
 
@@ -39,9 +38,7 @@ public class LogWithoutChain {
         }
     }
 
-    private static void howIsGirlFriendOfManager()
+    private static void howIsGirlFriendOfManager() throws GirlFriendOfManagerUpsetException {
-            throws GirlFriendOfManagerUpsetException {
+        throw new GirlFriendOfManagerUpsetException("Girl friend of manager is in bad mood");
-        throw new GirlFriendOfManagerUpsetException(
-                "Girl friend of manager is in bad mood");
     }
 }

core-java/src/main/java/com/baeldung/concurrent/blockingqueue/BlockingQueueUsage.java

@@ -0,0 +1,24 @@
+package com.baeldung.concurrent.blockingqueue;
+
+import java.util.concurrent.BlockingQueue;
+import java.util.concurrent.LinkedBlockingQueue;
+
+public class BlockingQueueUsage {
+    public static void main(String[] args) {
+        int BOUND = 10;
+        int N_PRODUCERS = 4;
+        int N_CONSUMERS = Runtime.getRuntime().availableProcessors();
+        int poisonPill = Integer.MAX_VALUE;
+        int poisonPillPerProducer = N_CONSUMERS / N_PRODUCERS;
+
+        BlockingQueue<Integer> queue = new LinkedBlockingQueue<>(BOUND);
+
+        for (int i = 0; i < N_PRODUCERS; i++) {
+            new Thread(new NumbersProducer(queue, poisonPill, poisonPillPerProducer)).start();
+        }
+
+        for (int j = 0; j < N_CONSUMERS; j++) {
+            new Thread(new NumbersConsumer(queue, poisonPill)).start();
+        }
+    }
+}

core-java/src/main/java/com/baeldung/concurrent/blockingqueue/NumbersConsumer.java

@@ -0,0 +1,28 @@
+package com.baeldung.concurrent.blockingqueue;
+
+import java.util.concurrent.BlockingQueue;
+
+public class NumbersConsumer implements Runnable {
+    private final BlockingQueue<Integer> queue;
+    private final int poisonPill;
+
+    public NumbersConsumer(BlockingQueue<Integer> queue, int poisonPill) {
+        this.queue = queue;
+        this.poisonPill = poisonPill;
+    }
+
+    public void run() {
+        try {
+            while (true) {
+                Integer number = queue.take();
+                if (number.equals(poisonPill)) {
+                    return;
+                }
+                String result = number.toString();
+                System.out.println(Thread.currentThread().getName() + " result: " + result);
+            }
+        } catch (InterruptedException e) {
+            Thread.currentThread().interrupt();
+        }
+    }
+}

core-java/src/main/java/com/baeldung/concurrent/blockingqueue/NumbersProducer.java

@@ -0,0 +1,34 @@
+package com.baeldung.concurrent.blockingqueue;
+
+import java.util.concurrent.BlockingQueue;
+import java.util.concurrent.ThreadLocalRandom;
+
+public class NumbersProducer implements Runnable {
+
+    private final BlockingQueue<Integer> numbersQueue;
+    private final int poisonPill;
+    private final int poisonPillPerProducer;
+
+    public NumbersProducer(BlockingQueue<Integer> numbersQueue, int poisonPill, int poisonPillPerProducer) {
+        this.numbersQueue = numbersQueue;
+        this.poisonPill = poisonPill;
+        this.poisonPillPerProducer = poisonPillPerProducer;
+    }
+
+    public void run() {
+        try {
+            generateNumbers();
+        } catch (InterruptedException e) {
+            Thread.currentThread().interrupt();
+        }
+    }
+
+    private void generateNumbers() throws InterruptedException {
+        for (int i = 0; i < 100; i++) {
+            numbersQueue.put(ThreadLocalRandom.current().nextInt(100));
+        }
+        for (int j = 0; j < poisonPillPerProducer; j++) {
+            numbersQueue.put(poisonPill);
+        }
+    }
+}

core-java/src/main/java/com/baeldung/concurrent/countdownlatch/BrokenWorker.java

@@ -0,0 +1,23 @@
+package com.baeldung.concurrent.countdownlatch;
+
+import java.util.List;
+import java.util.concurrent.CountDownLatch;
+
+public class BrokenWorker implements Runnable {
+    private final List<String> outputScraper;
+    private final CountDownLatch countDownLatch;
+
+    public BrokenWorker(final List<String> outputScraper, final CountDownLatch countDownLatch) {
+        this.outputScraper = outputScraper;
+        this.countDownLatch = countDownLatch;
+    }
+
+    @Override
+    public void run() {
+        if (true) {
+            throw new RuntimeException("Oh dear");
+        }
+        countDownLatch.countDown();
+        outputScraper.add("Counted down");
+    }
+}

core-java/src/main/java/com/baeldung/concurrent/countdownlatch/WaitingWorker.java

@@ -0,0 +1,34 @@
+package com.baeldung.concurrent.countdownlatch;
+
+import java.util.List;
+import java.util.concurrent.CountDownLatch;
+
+public class WaitingWorker implements Runnable {
+
+    private final List<String> outputScraper;
+    private final CountDownLatch readyThreadCounter;
+    private final CountDownLatch callingThreadBlocker;
+    private final CountDownLatch completedThreadCounter;
+
+    public WaitingWorker(final List<String> outputScraper, final CountDownLatch readyThreadCounter, final CountDownLatch callingThreadBlocker, CountDownLatch completedThreadCounter) {
+
+        this.outputScraper = outputScraper;
+        this.readyThreadCounter = readyThreadCounter;
+        this.callingThreadBlocker = callingThreadBlocker;
+        this.completedThreadCounter = completedThreadCounter;
+    }
+
+    @Override
+    public void run() {
+        // Mark this thread as read / started
+        readyThreadCounter.countDown();
+        try {
+            callingThreadBlocker.await();
+            outputScraper.add("Counted down");
+        } catch (InterruptedException e) {
+            e.printStackTrace();
+        } finally {
+            completedThreadCounter.countDown();
+        }
+    }
+}

core-java/src/main/java/com/baeldung/concurrent/countdownlatch/Worker.java

@@ -0,0 +1,22 @@
+package com.baeldung.concurrent.countdownlatch;
+
+import java.util.List;
+import java.util.concurrent.CountDownLatch;
+
+public class Worker implements Runnable {
+    private final List<String> outputScraper;
+    private final CountDownLatch countDownLatch;
+
+    public Worker(final List<String> outputScraper, final CountDownLatch countDownLatch) {
+        this.outputScraper = outputScraper;
+        this.countDownLatch = countDownLatch;
+    }
+
+    @Override
+    public void run() {
+        // Do some work
+        System.out.println("Doing some logic");
+        outputScraper.add("Counted down");
+        countDownLatch.countDown();
+    }
+}

core-java/src/main/java/com/baeldung/concurrent/future/FactorialSquareCalculator.java

@@ -0,0 +1,26 @@
+package com.baeldung.concurrent.future;
+
+import java.util.concurrent.RecursiveTask;
+
+public class FactorialSquareCalculator extends RecursiveTask<Integer> {
+    private static final long serialVersionUID = 1L;
+
+    final private Integer n;
+
+    public FactorialSquareCalculator(Integer n) {
+        this.n = n;
+    }
+
+    @Override
+    protected Integer compute() {
+        if (n <= 1) {
+            return n;
+        }
+
+        FactorialSquareCalculator calculator = new FactorialSquareCalculator(n - 1);
+
+        calculator.fork();
+
+        return n * n + calculator.join();
+    }
+}

core-java/src/main/java/com/baeldung/concurrent/future/SquareCalculator.java

@@ -0,0 +1,20 @@
+package com.baeldung.concurrent.future;
+
+import java.util.concurrent.ExecutorService;
+import java.util.concurrent.Future;
+
+public class SquareCalculator {
+
+    private final ExecutorService executor;
+
+    public SquareCalculator(ExecutorService executor) {
+        this.executor = executor;
+    }
+
+    public Future<Integer> calculate(Integer input) {
+        return executor.submit(() -> {
+            Thread.sleep(1000);
+            return input * input;
+        });        
+    }
+}

core-java/src/main/java/com/baeldung/java/map/MyLinkedHashMap.java

@@ -11,12 +11,10 @@ public class MyLinkedHashMap<K, V> extends LinkedHashMap<K, V> {
     private static final long serialVersionUID = 1L;
     private static final int MAX_ENTRIES = 5;
 
-
     public MyLinkedHashMap(int initialCapacity, float loadFactor, boolean accessOrder) {
         super(initialCapacity, loadFactor, accessOrder);
     }
 
-
     @Override
     protected boolean removeEldestEntry(Map.Entry eldest) {
         return size() > MAX_ENTRIES;

core-java/src/test/java/com/baeldung/CharArrayToStringUnitTest.java

@@ -0,0 +1,62 @@
+package com.baeldung;
+
+import static org.junit.Assert.*;
+
+import org.junit.Test;
+
+public class CharArrayToStringUnitTest {
+
+    @Test
+    public void givenCharArray_whenCallingStringConstructor_shouldConvertToString() {
+        char[] charArray = {'c', 'h', 'a', 'r', 'a', 'c', 't', 'e', 'r'};
+        String result = new String(charArray);
+        String expectedValue = "character";
+        
+        assertEquals(expectedValue, result);
+    }
+    
+    @Test
+    public void givenCharArray_whenCallingStringConstructorWithOffsetAndLength_shouldConvertToString(){
+        char[] charArray = {'c', 'h', 'a', 'r', 'a', 'c', 't', 'e', 'r'};
+        String result = new String(charArray, 4, 3);
+        String expectedValue = "act";
+        
+        assertEquals(expectedValue, result);
+    }
+    
+    @Test
+    public void givenCharArray_whenCallingStringCopyValueOf_shouldConvertToString(){
+        char[] charArray = {'c', 'h', 'a', 'r', 'a', 'c', 't', 'e', 'r'};
+        String result = String.copyValueOf(charArray);
+        String expectedValue = "character";
+        
+        assertEquals(expectedValue, result);
+    }
+    
+    @Test
+    public void givenCharArray_whenCallingStringCopyValueOfWithOffsetAndLength_shouldConvertToString(){
+        char[] charArray = {'c', 'h', 'a', 'r', 'a', 'c', 't', 'e', 'r'};
+        String result = String.copyValueOf(charArray, 0, 4);
+        String expectedValue = "char";
+        
+        assertEquals(expectedValue, result);
+    }
+    
+    @Test
+    public void givenCharArray_whenCallingStringValueOf_shouldConvertToString(){
+        char[] charArray = {'c', 'h', 'a', 'r', 'a', 'c', 't', 'e', 'r'};
+        String result = String.valueOf(charArray);
+        String expectedValue = "character";
+        
+        assertEquals(expectedValue, result);
+    }
+    
+    @Test
+    public void givenCharArray_whenCallingStringValueOfWithOffsetAndLength_shouldConvertToString(){
+        char[] charArray = {'c', 'h', 'a', 'r', 'a', 'c', 't', 'e', 'r'};
+        String result = String.valueOf(charArray, 3, 4);
+        String expectedValue = "ract";
+        
+        assertEquals(expectedValue, result);
+    }
+}

core-java/src/test/java/com/baeldung/StringToCharArrayUnitTest.java

@@ -0,0 +1,20 @@
+package com.baeldung;
+
+import static org.junit.Assert.*;
+
+import org.junit.Test;
+
+public class StringToCharArrayUnitTest {
+
+@Test
+public void givenString_whenCallingStringToCharArray_shouldConvertToCharArray() {
+    String givenString = "characters";
+
+    char[] result = givenString.toCharArray();
+
+    char[] expectedCharArray = { 'c', 'h', 'a', 'r', 'a', 'c', 't', 'e', 'r', 's' };
+
+    assertArrayEquals(expectedCharArray, result);
+}
+
+}

core-java/src/test/java/com/baeldung/collectors/Java8CollectorsUnitTest.java

@@ -42,116 +42,80 @@ public class Java8CollectorsUnitTest {
 
     @Test
     public void whenCollectingToList_shouldCollectToList() throws Exception {
-        final List<String> result = givenList
+        final List<String> result = givenList.stream().collect(toList());
-          .stream()
-          .collect(toList());
 
         assertThat(result).containsAll(givenList);
     }
 
     @Test
     public void whenCollectingToList_shouldCollectToSet() throws Exception {
-        final Set<String> result = givenList
+        final Set<String> result = givenList.stream().collect(toSet());
-          .stream()
-          .collect(toSet());
 
         assertThat(result).containsAll(givenList);
     }
 
     @Test
     public void whenCollectingToCollection_shouldCollectToCollection() throws Exception {
-        final List<String> result = givenList
+        final List<String> result = givenList.stream().collect(toCollection(LinkedList::new));
-          .stream()
-          .collect(toCollection(LinkedList::new));
 
-        assertThat(result)
+        assertThat(result).containsAll(givenList).isInstanceOf(LinkedList.class);
-          .containsAll(givenList)
-          .isInstanceOf(LinkedList.class);
     }
 
     @Test
     public void whenCollectingToImmutableCollection_shouldThrowException() throws Exception {
         assertThatThrownBy(() -> {
-            givenList
+            givenList.stream().collect(toCollection(ImmutableList::of));
-              .stream()
-              .collect(toCollection(ImmutableList::of));
         }).isInstanceOf(UnsupportedOperationException.class);
 
     }
 
     @Test
     public void whenCollectingToMap_shouldCollectToMap() throws Exception {
-        final Map<String, Integer> result = givenList
+        final Map<String, Integer> result = givenList.stream().collect(toMap(Function.identity(), String::length));
-          .stream()
-          .collect(toMap(Function.identity(), String::length));
 
-        assertThat(result)
+        assertThat(result).containsEntry("a", 1).containsEntry("bb", 2).containsEntry("ccc", 3).containsEntry("dd", 2);
-          .containsEntry("a", 1)
-          .containsEntry("bb", 2)
-          .containsEntry("ccc", 3)
-          .containsEntry("dd", 2);
     }
 
     @Test
     public void whenCollectingToMap_shouldCollectToMapMerging() throws Exception {
-        final Map<String, Integer> result = givenList
+        final Map<String, Integer> result = givenList.stream().collect(toMap(Function.identity(), String::length, (i1, i2) -> i1));
-          .stream()
-          .collect(toMap(Function.identity(), String::length, (i1, i2) -> i1));
 
-        assertThat(result)
+        assertThat(result).containsEntry("a", 1).containsEntry("bb", 2).containsEntry("ccc", 3).containsEntry("dd", 2);
-          .containsEntry("a", 1)
-          .containsEntry("bb", 2)
-          .containsEntry("ccc", 3)
-          .containsEntry("dd", 2);
     }
 
     @Test
     public void whenCollectingAndThen_shouldCollect() throws Exception {
-        final List<String> result = givenList
+        final List<String> result = givenList.stream().collect(collectingAndThen(toList(), ImmutableList::copyOf));
-          .stream()
-          .collect(collectingAndThen(toList(), ImmutableList::copyOf));
 
-        assertThat(result)
+        assertThat(result).containsAll(givenList).isInstanceOf(ImmutableList.class);
-          .containsAll(givenList)
-          .isInstanceOf(ImmutableList.class);
     }
 
     @Test
     public void whenJoining_shouldJoin() throws Exception {
-        final String result = givenList
+        final String result = givenList.stream().collect(joining());
-          .stream()
-          .collect(joining());
 
         assertThat(result).isEqualTo("abbcccdd");
     }
 
     @Test
     public void whenJoiningWithSeparator_shouldJoinWithSeparator() throws Exception {
-        final String result = givenList
+        final String result = givenList.stream().collect(joining(" "));
-          .stream()
-          .collect(joining(" "));
 
         assertThat(result).isEqualTo("a bb ccc dd");
     }
 
     @Test
     public void whenJoiningWithSeparatorAndPrefixAndPostfix_shouldJoinWithSeparatorPrePost() throws Exception {
-        final String result = givenList
+        final String result = givenList.stream().collect(joining(" ", "PRE-", "-POST"));
-          .stream()
-          .collect(joining(" ", "PRE-", "-POST"));
 
         assertThat(result).isEqualTo("PRE-a bb ccc dd-POST");
     }
 
     @Test
     public void whenPartitioningBy_shouldPartition() throws Exception {
-        final Map<Boolean, List<String>> result = givenList
+        final Map<Boolean, List<String>> result = givenList.stream().collect(partitioningBy(s -> s.length() > 2));
-          .stream()
-          .collect(partitioningBy(s -> s.length() > 2));
 
-        assertThat(result)
+        assertThat(result).containsKeys(true, false).satisfies(booleanListMap -> {
-          .containsKeys(true, false)
-          .satisfies(booleanListMap -> {
             assertThat(booleanListMap.get(true)).contains("ccc");
 
             assertThat(booleanListMap.get(false)).contains("a", "bb", "dd");
@@ -160,18 +124,14 @@ public class Java8CollectorsUnitTest {
 
     @Test
     public void whenCounting_shouldCount() throws Exception {
-        final Long result = givenList
+        final Long result = givenList.stream().collect(counting());
-          .stream()
-          .collect(counting());
 
         assertThat(result).isEqualTo(4);
     }
 
     @Test
     public void whenSummarizing_shouldSummarize() throws Exception {
-        final DoubleSummaryStatistics result = givenList
+        final DoubleSummaryStatistics result = givenList.stream().collect(summarizingDouble(String::length));
-          .stream()
-          .collect(summarizingDouble(String::length));
 
         assertThat(result.getAverage()).isEqualTo(2);
         assertThat(result.getCount()).isEqualTo(4);
@@ -182,55 +142,37 @@ public class Java8CollectorsUnitTest {
 
     @Test
     public void whenAveraging_shouldAverage() throws Exception {
-        final Double result = givenList
+        final Double result = givenList.stream().collect(averagingDouble(String::length));
-          .stream()
-          .collect(averagingDouble(String::length));
 
         assertThat(result).isEqualTo(2);
     }
 
     @Test
     public void whenSumming_shouldSum() throws Exception {
-        final Double result = givenList
+        final Double result = givenList.stream().filter(i -> true).collect(summingDouble(String::length));
-          .stream()
-          .filter(i -> true)
-          .collect(summingDouble(String::length));
 
         assertThat(result).isEqualTo(8);
     }
 
     @Test
     public void whenMaxingBy_shouldMaxBy() throws Exception {
-        final Optional<String> result = givenList
+        final Optional<String> result = givenList.stream().collect(maxBy(Comparator.naturalOrder()));
-          .stream()
-          .collect(maxBy(Comparator.naturalOrder()));
 
-        assertThat(result)
+        assertThat(result).isPresent().hasValue("dd");
-          .isPresent()
-          .hasValue("dd");
     }
 
     @Test
     public void whenGroupingBy_shouldGroupBy() throws Exception {
-        final Map<Integer, Set<String>> result = givenList
+        final Map<Integer, Set<String>> result = givenList.stream().collect(groupingBy(String::length, toSet()));
-          .stream()
-          .collect(groupingBy(String::length, toSet()));
 
-        assertThat(result)
+        assertThat(result).containsEntry(1, newHashSet("a")).containsEntry(2, newHashSet("bb", "dd")).containsEntry(3, newHashSet("ccc"));
-          .containsEntry(1, newHashSet("a"))
-          .containsEntry(2, newHashSet("bb", "dd"))
-          .containsEntry(3, newHashSet("ccc"));
     }
 
     @Test
     public void whenCreatingCustomCollector_shouldCollect() throws Exception {
-        final ImmutableSet<String> result = givenList
+        final ImmutableSet<String> result = givenList.stream().collect(toImmutableSet());
-          .stream()
-          .collect(toImmutableSet());
 
-        assertThat(result)
+        assertThat(result).isInstanceOf(ImmutableSet.class).contains("a", "bb", "ccc", "dd");
-          .isInstanceOf(ImmutableSet.class)
-          .contains("a", "bb", "ccc", "dd");
 
     }
 

core-java/src/test/java/com/baeldung/concurrent/countdownlatch/CountdownLatchExampleTest.java

@@ -0,0 +1,70 @@
+package com.baeldung.concurrent.countdownlatch;
+
+import org.junit.Test;
+
+import java.util.ArrayList;
+import java.util.Collections;
+import java.util.List;
+import java.util.concurrent.CountDownLatch;
+import java.util.concurrent.TimeUnit;
+import java.util.stream.Stream;
+
+import static java.util.stream.Collectors.toList;
+import static org.assertj.core.api.Assertions.assertThat;
+
+public class CountdownLatchExampleTest {
+    @Test
+    public void whenParallelProcessing_thenMainThreadWillBlockUntilCompletion() throws InterruptedException {
+        // Given
+        List<String> outputScraper = Collections.synchronizedList(new ArrayList<>());
+        CountDownLatch countDownLatch = new CountDownLatch(5);
+        List<Thread> workers = Stream.generate(() -> new Thread(new Worker(outputScraper, countDownLatch))).limit(5).collect(toList());
+
+        // When
+        workers.forEach(Thread::start);
+        countDownLatch.await(); // Block until workers finish
+        outputScraper.add("Latch released");
+
+        // Then
+        outputScraper.forEach(Object::toString);
+        assertThat(outputScraper).containsExactly("Counted down", "Counted down", "Counted down", "Counted down", "Counted down", "Latch released");
+    }
+
+    @Test
+    public void whenFailingToParallelProcess_thenMainThreadShouldTimeout() throws InterruptedException {
+        // Given
+        List<String> outputScraper = Collections.synchronizedList(new ArrayList<>());
+        CountDownLatch countDownLatch = new CountDownLatch(5);
+        List<Thread> workers = Stream.generate(() -> new Thread(new BrokenWorker(outputScraper, countDownLatch))).limit(5).collect(toList());
+
+        // When
+        workers.forEach(Thread::start);
+        final boolean result = countDownLatch.await(3L, TimeUnit.SECONDS);
+
+        // Then
+        assertThat(result).isFalse();
+    }
+
+    @Test
+    public void whenDoingLotsOfThreadsInParallel_thenStartThemAtTheSameTime() throws InterruptedException {
+        // Given
+        List<String> outputScraper = Collections.synchronizedList(new ArrayList<>());
+        CountDownLatch readyThreadCounter = new CountDownLatch(5);
+        CountDownLatch callingThreadBlocker = new CountDownLatch(1);
+        CountDownLatch completedThreadCounter = new CountDownLatch(5);
+        List<Thread> workers = Stream.generate(() -> new Thread(new WaitingWorker(outputScraper, readyThreadCounter, callingThreadBlocker, completedThreadCounter))).limit(5).collect(toList());
+
+        // When
+        workers.forEach(Thread::start);
+        readyThreadCounter.await(); // Block until workers start
+        outputScraper.add("Workers ready");
+        callingThreadBlocker.countDown(); // Start workers
+        completedThreadCounter.await(); // Block until workers finish
+        outputScraper.add("Workers complete");
+
+        // Then
+        outputScraper.forEach(Object::toString);
+        assertThat(outputScraper).containsExactly("Workers ready", "Counted down", "Counted down", "Counted down", "Counted down", "Counted down", "Workers complete");
+    }
+
+}

core-java/src/test/java/com/baeldung/concurrent/future/FactorialSquareCalculatorUnitTest.java

@@ -0,0 +1,22 @@
+package com.baeldung.concurrent.future;
+
+import static org.junit.Assert.assertEquals;
+
+import java.util.concurrent.ForkJoinPool;
+
+import org.junit.Test;
+
+public class FactorialSquareCalculatorUnitTest {
+
+    @Test
+    public void whenCalculatesFactorialSquare_thenReturnCorrectValue() {
+        ForkJoinPool forkJoinPool = new ForkJoinPool();
+
+        FactorialSquareCalculator calculator = new FactorialSquareCalculator(10);
+
+        forkJoinPool.execute(calculator);
+
+        assertEquals("The sum of the squares from 1 to 10 is 385", 385, calculator.join().intValue());
+    }
+
+}

core-java/src/test/java/com/baeldung/concurrent/future/SquareCalculatorUnitTest.java

@@ -0,0 +1,94 @@
+package com.baeldung.concurrent.future;
+
+import static org.junit.Assert.assertEquals;
+import static org.junit.Assert.assertTrue;
+
+import java.util.concurrent.CancellationException;
+import java.util.concurrent.ExecutionException;
+import java.util.concurrent.Executors;
+import java.util.concurrent.Future;
+import java.util.concurrent.TimeUnit;
+import java.util.concurrent.TimeoutException;
+
+import org.junit.After;
+import org.junit.Before;
+import org.junit.Rule;
+import org.junit.Test;
+import org.junit.rules.TestName;
+
+public class SquareCalculatorUnitTest {
+
+    @Rule
+    public TestName name = new TestName();
+
+    private long start;
+
+    private SquareCalculator squareCalculator;
+
+    @Test
+    public void givenExecutorIsSingleThreaded_whenTwoExecutionsAreTriggered_thenRunInSequence() throws InterruptedException, ExecutionException {
+        squareCalculator = new SquareCalculator(Executors.newSingleThreadExecutor());
+
+        Future<Integer> result1 = squareCalculator.calculate(4);
+        Future<Integer> result2 = squareCalculator.calculate(1000);
+
+        while (!result1.isDone() || !result2.isDone()) {
+            System.out.println(String.format("Task 1 is %s and Task 2 is %s.", result1.isDone() ? "done" : "not done", result2.isDone() ? "done" : "not done"));
+
+            Thread.sleep(300);
+        }
+
+        assertEquals(16, result1.get().intValue());
+        assertEquals(1000000, result2.get().intValue());
+    }
+
+    @Test(expected = TimeoutException.class)
+    public void whenGetWithTimeoutLowerThanExecutionTime_thenThrowException() throws InterruptedException, ExecutionException, TimeoutException {
+        squareCalculator = new SquareCalculator(Executors.newSingleThreadExecutor());
+
+        Future<Integer> result = squareCalculator.calculate(4);
+
+        result.get(500, TimeUnit.MILLISECONDS);
+    }
+
+    @Test
+    public void givenExecutorIsMultiThreaded_whenTwoExecutionsAreTriggered_thenRunInParallel() throws InterruptedException, ExecutionException {
+        squareCalculator = new SquareCalculator(Executors.newFixedThreadPool(2));
+
+        Future<Integer> result1 = squareCalculator.calculate(4);
+        Future<Integer> result2 = squareCalculator.calculate(1000);
+
+        while (!result1.isDone() || !result2.isDone()) {
+            System.out.println(String.format("Task 1 is %s and Task 2 is %s.", result1.isDone() ? "done" : "not done", result2.isDone() ? "done" : "not done"));
+
+            Thread.sleep(300);
+        }
+
+        assertEquals(16, result1.get().intValue());
+        assertEquals(1000000, result2.get().intValue());
+    }
+
+    @Test(expected = CancellationException.class)
+    public void whenCancelFutureAndCallGet_thenThrowException() throws InterruptedException, ExecutionException, TimeoutException {
+        squareCalculator = new SquareCalculator(Executors.newSingleThreadExecutor());
+
+        Future<Integer> result = squareCalculator.calculate(4);
+
+        boolean canceled = result.cancel(true);
+
+        assertTrue("Future was canceled", canceled);
+        assertTrue("Future was canceled", result.isCancelled());
+
+        result.get();
+    }
+
+    @Before
+    public void start() {
+        start = System.currentTimeMillis();
+    }
+
+    @After
+    public void end() {
+        System.out.println(String.format("Test %s took %s ms \n", name.getMethodName(), System.currentTimeMillis() - start));
+    }
+}

core-java/src/test/java/com/baeldung/concurrent/priorityblockingqueue/PriorityBlockingQueueUnitTest.java

@@ -0,0 +1,57 @@
+package com.baeldung.concurrent.priorityblockingqueue;
+
+import org.assertj.core.api.Assertions;
+import org.junit.Test;
+
+import java.util.ArrayList;
+import java.util.concurrent.PriorityBlockingQueue;
+import java.util.concurrent.TimeUnit;
+import java.util.stream.IntStream;
+
+import static org.assertj.core.api.Assertions.assertThat;
+import static org.assertj.core.util.Lists.newArrayList;
+
+public class PriorityBlockingQueueUnitTest {
+
+    @Test
+    public void givenUnorderedValues_whenPolling_thenShouldOrderQueue() throws InterruptedException {
+        PriorityBlockingQueue<Integer> queue = new PriorityBlockingQueue<>();
+        ArrayList<Integer> polledElements = new ArrayList<>();
+
+        queue.add(1);
+        queue.add(5);
+        queue.add(2);
+        queue.add(3);
+        queue.add(4);
+
+        polledElements.add(queue.poll());
+        polledElements.add(queue.poll());
+        polledElements.add(queue.poll());
+        polledElements.add(queue.poll());
+        polledElements.add(queue.poll());
+
+        assertThat(polledElements).containsExactly(1, 2, 3, 4, 5);
+    }
+
+    @Test
+    public void whenPollingEmptyQueue_thenShouldBlockThread() throws InterruptedException {
+        PriorityBlockingQueue<Integer> queue = new PriorityBlockingQueue<>();
+
+        final Thread thread = new Thread(() -> {
+          System.out.println("Polling...");
+          while (true) {
+            try {
+              Integer poll = queue.take();
+              System.out.println("Polled: " + poll);
+            } catch (InterruptedException e) {}
+          }
+        });
+        thread.start();
+
+        Thread.sleep(TimeUnit.SECONDS.toMillis(5));
+        System.out.println("Adding to queue");
+
+        queue.addAll(newArrayList(1, 5, 6, 1, 2, 6, 7));
+        Thread.sleep(TimeUnit.SECONDS.toMillis(1));
+    }
+}

core-java/src/test/java/com/baeldung/java/concurrentmap/ConcurrentMapAggregateStatusTest.java

@@ -0,0 +1,76 @@
+package com.baeldung.java.concurrentmap;
+
+import org.junit.Before;
+import org.junit.Test;
+
+import java.util.ArrayList;
+import java.util.List;
+import java.util.Map;
+import java.util.concurrent.ConcurrentHashMap;
+import java.util.concurrent.ExecutorService;
+import java.util.concurrent.Executors;
+import java.util.concurrent.TimeUnit;
+
+import static org.junit.Assert.assertEquals;
+import static org.junit.Assert.assertNotEquals;
+
+public class ConcurrentMapAggregateStatusTest {
+
+    private ExecutorService executorService;
+    private Map<String, Integer> concurrentMap;
+    private List<Integer> mapSizes;
+    private int MAX_SIZE = 100000;
+
+    @Before
+    public void init() {
+        executorService = Executors.newFixedThreadPool(2);
+        concurrentMap = new ConcurrentHashMap<>();
+        mapSizes = new ArrayList<>(MAX_SIZE);
+    }
+
+    @Test
+    public void givenConcurrentMap_whenSizeWithoutConcurrentUpdates_thenCorrect() throws InterruptedException {
+        Runnable collectMapSizes = () -> {
+            for (int i = 0; i < MAX_SIZE; i++) {
+                concurrentMap.put(String.valueOf(i), i);
+                mapSizes.add(concurrentMap.size());
+            }
+        };
+        Runnable retrieveMapData = () -> {
+            for (int i = 0; i < MAX_SIZE; i++) {
+                concurrentMap.get(String.valueOf(i));
+            }
+        };
+        executorService.execute(retrieveMapData);
+        executorService.execute(collectMapSizes);
+        executorService.shutdown();
+        executorService.awaitTermination(1, TimeUnit.MINUTES);
+
+        for (int i = 1; i <= MAX_SIZE; i++) {
+            assertEquals("map size should be consistently reliable", i, mapSizes.get(i - 1).intValue());
+        }
+        assertEquals(MAX_SIZE, concurrentMap.size());
+    }
+
+    @Test
+    public void givenConcurrentMap_whenUpdatingAndGetSize_thenError() throws InterruptedException {
+        Runnable collectMapSizes = () -> {
+            for (int i = 0; i < MAX_SIZE; i++) {
+                mapSizes.add(concurrentMap.size());
+            }
+        };
+        Runnable updateMapData = () -> {
+            for (int i = 0; i < MAX_SIZE; i++) {
+                concurrentMap.put(String.valueOf(i), i);
+            }
+        };
+        executorService.execute(updateMapData);
+        executorService.execute(collectMapSizes);
+        executorService.shutdown();
+        executorService.awaitTermination(1, TimeUnit.MINUTES);
+
+        assertNotEquals("map size collected with concurrent updates not reliable", MAX_SIZE, mapSizes.get(MAX_SIZE - 1).intValue());
+        assertEquals(MAX_SIZE, concurrentMap.size());
+    }
+
+}

core-java/src/test/java/com/baeldung/java/concurrentmap/ConcurrentMapNullKeyValueTest.java

@@ -0,0 +1,160 @@
+package com.baeldung.java.concurrentmap;
+
+import org.junit.Before;
+import org.junit.Test;
+
+import java.util.HashMap;
+import java.util.Map;
+import java.util.concurrent.ConcurrentHashMap;
+import java.util.concurrent.ConcurrentMap;
+
+import static org.junit.Assert.assertNull;
+
+public class ConcurrentMapNullKeyValueTest {
+
+    ConcurrentMap<String, Object> concurrentMap;
+
+    @Before
+    public void setup() {
+        concurrentMap = new ConcurrentHashMap<>();
+    }
+
+    @Test(expected = NullPointerException.class)
+    public void givenConcurrentHashMap_whenGetWithNullKey_thenThrowsNPE() {
+        concurrentMap.get(null);
+    }
+
+    @Test(expected = NullPointerException.class)
+    public void givenConcurrentHashMap_whenGetOrDefaultWithNullKey_thenThrowsNPE() {
+        concurrentMap.getOrDefault(null, new Object());
+    }
+
+    @Test(expected = NullPointerException.class)
+    public void givenConcurrentHashMap_whenPutWithNullKey_thenThrowsNPE() {
+        concurrentMap.put(null, new Object());
+    }
+
+    @Test(expected = NullPointerException.class)
+    public void givenConcurrentHashMap_whenPutNullValue_thenThrowsNPE() {
+        concurrentMap.put("test", null);
+    }
+
+    @Test(expected = NullPointerException.class)
+    public void givenConcurrentHashMapAndKeyAbsent_whenPutWithNullKey_thenThrowsNPE() {
+        concurrentMap.putIfAbsent(null, new Object());
+    }
+
+    @Test(expected = NullPointerException.class)
+    public void givenConcurrentHashMapAndMapWithNullKey_whenPutNullKeyMap_thenThrowsNPE() {
+        Map<String, Object> nullKeyMap = new HashMap<>();
+        nullKeyMap.put(null, new Object());
+        concurrentMap.putAll(nullKeyMap);
+    }
+
+    @Test(expected = NullPointerException.class)
+    public void givenConcurrentHashMapAndMapWithNullValue_whenPutNullValueMap_thenThrowsNPE() {
+        Map<String, Object> nullValueMap = new HashMap<>();
+        nullValueMap.put("test", null);
+        concurrentMap.putAll(nullValueMap);
+    }
+
+    @Test(expected = NullPointerException.class)
+    public void givenConcurrentHashMap_whenReplaceNullKeyWithValues_thenThrowsNPE() {
+        concurrentMap.replace(null, new Object(), new Object());
+    }
+
+    @Test(expected = NullPointerException.class)
+    public void givenConcurrentHashMap_whenReplaceWithNullNewValue_thenThrowsNPE() {
+        Object o = new Object();
+        concurrentMap.replace("test", o, null);
+    }
+
+    @Test(expected = NullPointerException.class)
+    public void givenConcurrentHashMap_whenReplaceOldNullValue_thenThrowsNPE() {
+        Object o = new Object();
+        concurrentMap.replace("test", null, o);
+    }
+
+    @Test(expected = NullPointerException.class)
+    public void givenConcurrentHashMap_whenReplaceWithNullValue_thenThrowsNPE() {
+        concurrentMap.replace("test", null);
+    }
+
+    @Test(expected = NullPointerException.class)
+    public void givenConcurrentHashMap_whenReplaceNullKey_thenThrowsNPE() {
+        concurrentMap.replace(null, "test");
+    }
+
+    @Test(expected = NullPointerException.class)
+    public void givenConcurrentHashMap_whenReplaceAllMappingNull_thenThrowsNPE() {
+        concurrentMap.put("test", new Object());
+        concurrentMap.replaceAll((s, o) -> null);
+    }
+
+    @Test(expected = NullPointerException.class)
+    public void givenConcurrentHashMap_whenRemoveNullKey_thenThrowsNPE() {
+        concurrentMap.remove(null);
+    }
+
+    @Test(expected = NullPointerException.class)
+    public void givenConcurrentHashMap_whenRemoveNullKeyWithValue_thenThrowsNPE() {
+        concurrentMap.remove(null, new Object());
+    }
+
+    @Test(expected = NullPointerException.class)
+    public void givenConcurrentHashMap_whenMergeNullKeyWithValue_thenThrowsNPE() {
+        concurrentMap.merge(null, new Object(), (o, o2) -> o2);
+    }
+
+    @Test(expected = NullPointerException.class)
+    public void givenConcurrentHashMap_whenMergeKeyWithNullValue_thenThrowsNPE() {
+        concurrentMap.put("test", new Object());
+        concurrentMap.merge("test", null, (o, o2) -> o2);
+    }
+
+    @Test(expected = NullPointerException.class)
+    public void givenConcurrentHashMapAndAssumeKeyAbsent_whenComputeWithNullKey_thenThrowsNPE() {
+        concurrentMap.computeIfAbsent(null, s -> s);
+    }
+
+    @Test(expected = NullPointerException.class)
+    public void givenConcurrentHashMapAndAssumeKeyPresent_whenComputeWithNullKey_thenThrowsNPE() {
+        concurrentMap.computeIfPresent(null, (s, o) -> o);
+    }
+
+    @Test(expected = NullPointerException.class)
+    public void givenConcurrentHashMap_whenComputeWithNullKey_thenThrowsNPE() {
+        concurrentMap.compute(null, (s, o) -> o);
+    }
+
+    @Test
+    public void givenConcurrentHashMap_whenMergeKeyRemappingNull_thenRemovesMapping() {
+        Object oldValue = new Object();
+        concurrentMap.put("test", oldValue);
+        concurrentMap.merge("test", new Object(), (o, o2) -> null);
+        assertNull(concurrentMap.get("test"));
+    }
+
+    @Test
+    public void givenConcurrentHashMapAndKeyAbsent_whenComputeWithKeyRemappingNull_thenRemainsAbsent() {
+        concurrentMap.computeIfPresent("test", (s, o) -> null);
+        assertNull(concurrentMap.get("test"));
+    }
+
+    @Test
+    public void givenKeyPresent_whenComputeIfPresentRemappingNull_thenMappingRemoved() {
+        Object oldValue = new Object();
+        concurrentMap.put("test", oldValue);
+        concurrentMap.computeIfPresent("test", (s, o) -> null);
+        assertNull(concurrentMap.get("test"));
+    }
+
+    @Test
+    public void givenKeyPresent_whenComputeRemappingNull_thenMappingRemoved() {
+        Object oldValue = new Object();
+        concurrentMap.put("test", oldValue);
+        concurrentMap.compute("test", (s, o) -> null);
+        assertNull(concurrentMap.get("test"));
+    }
+
+}

core-java/src/test/java/com/baeldung/java/concurrentmap/ConcurrentMapPerformanceTest.java

@@ -0,0 +1,95 @@
+package com.baeldung.java.concurrentmap;
+
+import org.junit.Test;
+
+import java.util.Collections;
+import java.util.HashMap;
+import java.util.Hashtable;
+import java.util.Map;
+import java.util.concurrent.*;
+
+import static org.junit.Assert.assertEquals;
+import static org.junit.Assert.assertTrue;
+
+public class ConcurrentMapPerformanceTest {
+
+    @Test
+    public void givenMaps_whenGetPut500KTimes_thenConcurrentMapFaster() throws Exception {
+        Map<String, Object> hashtable = new Hashtable<>();
+        Map<String, Object> synchronizedHashMap = Collections.synchronizedMap(new HashMap<>());
+        Map<String, Object> concurrentHashMap = new ConcurrentHashMap<>();
+
+        long hashtableAvgRuntime = timeElapseForGetPut(hashtable);
+        long syncHashMapAvgRuntime = timeElapseForGetPut(synchronizedHashMap);
+        long concurrentHashMapAvgRuntime = timeElapseForGetPut(concurrentHashMap);
+
+        System.out.println(String.format("Hashtable: %s, syncHashMap: %s, ConcurrentHashMap: %s", hashtableAvgRuntime, syncHashMapAvgRuntime, concurrentHashMapAvgRuntime));
+
+        assertTrue(hashtableAvgRuntime > concurrentHashMapAvgRuntime);
+        assertTrue(syncHashMapAvgRuntime > concurrentHashMapAvgRuntime);
+
+    }
+
+    private long timeElapseForGetPut(Map<String, Object> map) throws InterruptedException {
+        ExecutorService executorService = Executors.newFixedThreadPool(4);
+        long startTime = System.nanoTime();
+        for (int i = 0; i < 4; i++) {
+            executorService.execute(() -> {
+                for (int j = 0; j < 500_000; j++) {
+                    int value = ThreadLocalRandom.current().nextInt(10000);
+                    String key = String.valueOf(value);
+                    map.put(key, value);
+                    map.get(key);
+                }
+            });
+        }
+        executorService.shutdown();
+        executorService.awaitTermination(1, TimeUnit.MINUTES);
+        return (System.nanoTime() - startTime) / 500_000;
+    }
+
+    @Test
+    public void givenConcurrentMap_whenKeyWithSameHashCode_thenPerformanceDegrades() throws InterruptedException {
+        class SameHash {
+            @Override
+            public int hashCode() {
+                return 1;
+            }
+        }
+        int executeTimes = 5000;
+
+        Map<SameHash, Integer> mapOfSameHash = new ConcurrentHashMap<>();
+        ExecutorService executorService = Executors.newFixedThreadPool(2);
+        long sameHashStartTime = System.currentTimeMillis();
+        for (int i = 0; i < 2; i++) {
+            executorService.execute(() -> {
+                for (int j = 0; j < executeTimes; j++) {
+                    mapOfSameHash.put(new SameHash(), 1);
+                }
+            });
+        }
+        executorService.shutdown();
+        executorService.awaitTermination(5, TimeUnit.SECONDS);
+
+        long mapOfSameHashDuration = System.currentTimeMillis() - sameHashStartTime;
+        Map<Object, Integer> mapOfDefaultHash = new ConcurrentHashMap<>();
+        executorService = Executors.newFixedThreadPool(2);
+        long defaultHashStartTime = System.currentTimeMillis();
+        for (int i = 0; i < 2; i++) {
+            executorService.execute(() -> {
+                for (int j = 0; j < executeTimes; j++) {
+                    mapOfDefaultHash.put(new Object(), 1);
+                }
+            });
+        }
+        executorService.shutdown();
+        executorService.awaitTermination(5, TimeUnit.SECONDS);
+
+        long mapOfDefaultHashDuration = System.currentTimeMillis() - defaultHashStartTime;
+        assertEquals(executeTimes * 2, mapOfDefaultHash.size());
+        assertEquals(executeTimes * 2, mapOfSameHash.size());
+        System.out.println(String.format("same-hash: %s, default-hash: %s", mapOfSameHashDuration, mapOfDefaultHashDuration));
+        assertTrue("same hashCode() should greatly degrade performance", mapOfSameHashDuration > mapOfDefaultHashDuration * 10);
+    }
+
+}

core-java/src/test/java/com/baeldung/java/concurrentmap/ConcurrentNavigableMapTests.java

@@ -0,0 +1,79 @@
+package com.baeldung.java.concurrentmap;
+
+import org.junit.Test;
+
+import java.util.Iterator;
+import java.util.NavigableMap;
+import java.util.TreeMap;
+import java.util.concurrent.*;
+import java.util.concurrent.atomic.AtomicInteger;
+
+import static org.testng.Assert.*;
+
+public class ConcurrentNavigableMapTests {
+
+    @Test
+    public void givenSkipListMap_whenAccessInMultiThreads_thenOrderingStable() throws InterruptedException {
+        NavigableMap<Integer, String> skipListMap = new ConcurrentSkipListMap<>();
+
+        updateMapConcurrently(skipListMap, 4);
+
+        Iterator<Integer> skipListIter = skipListMap
+          .keySet()
+          .iterator();
+        int previous = skipListIter.next();
+        while (skipListIter.hasNext()) {
+            int current = skipListIter.next();
+            assertTrue(previous < current);
+        }
+    }
+
+    private void updateMapConcurrently(NavigableMap<Integer, String> navigableMap, int concurrencyLevel) throws InterruptedException {
+        ExecutorService executorService = Executors.newFixedThreadPool(concurrencyLevel);
+        for (int i = 0; i < concurrencyLevel; i++) {
+            executorService.execute(() -> {
+                ThreadLocalRandom random = ThreadLocalRandom.current();
+                for (int j = 0; j < 10000; j++) {
+                    navigableMap.put(random.nextInt(), "test");
+                }
+            });
+        }
+        executorService.shutdown();
+        executorService.awaitTermination(1, TimeUnit.MINUTES);
+    }
+
+    @Test
+    public void givenSkipListMap_whenNavConcurrently_thenCountCorrect() throws InterruptedException {
+        NavigableMap<Integer, Integer> skipListMap = new ConcurrentSkipListMap<>();
+        int count = countMapElementByPollingFirstEntry(skipListMap, 10000, 4);
+        assertEquals(10000 * 4, count);
+    }
+
+    @Test
+    public void givenTreeMap_whenNavConcurrently_thenCountError() throws InterruptedException {
+        NavigableMap<Integer, Integer> treeMap = new TreeMap<>();
+        int count = countMapElementByPollingFirstEntry(treeMap, 10000, 4);
+        assertNotEquals(10000 * 4, count);
+    }
+
+    private int countMapElementByPollingFirstEntry(NavigableMap<Integer, Integer> navigableMap, int elementCount, int concurrencyLevel) throws InterruptedException {
+        for (int i = 0; i < elementCount * concurrencyLevel; i++) {
+            navigableMap.put(i, i);
+        }
+        AtomicInteger counter = new AtomicInteger(0);
+        ExecutorService executorService = Executors.newFixedThreadPool(concurrencyLevel);
+        for (int j = 0; j < concurrencyLevel; j++) {
+            executorService.execute(() -> {
+                for (int i = 0; i < elementCount; i++) {
+                    if (navigableMap.pollFirstEntry() != null) {
+                        counter.incrementAndGet();
+                    }
+                }
+            });
+        }
+        executorService.shutdown();
+        executorService.awaitTermination(1, TimeUnit.MINUTES);
+        return counter.get();
+    }
+
+}

core-java/src/test/java/com/baeldung/java/concurrentmap/ConcurretMapMemoryConsistencyTest.java

@@ -0,0 +1,60 @@
+package com.baeldung.java.concurrentmap;
+
+import org.junit.Test;
+
+import java.util.*;
+import java.util.concurrent.ConcurrentHashMap;
+import java.util.concurrent.ExecutorService;
+import java.util.concurrent.Executors;
+import java.util.concurrent.TimeUnit;
+
+import static org.junit.Assert.*;
+
+public class ConcurretMapMemoryConsistencyTest {
+
+    @Test
+    public void givenConcurrentMap_whenSumParallel_thenCorrect() throws Exception {
+        Map<String, Integer> map = new ConcurrentHashMap<>();
+        List<Integer> sumList = parallelSum100(map, 1000);
+        assertEquals(1, sumList.stream().distinct().count());
+        long wrongResultCount = sumList.stream().filter(num -> num != 100).count();
+        assertEquals(0, wrongResultCount);
+    }
+
+    @Test
+    public void givenHashtable_whenSumParallel_thenCorrect() throws Exception {
+        Map<String, Integer> map = new Hashtable<>();
+        List<Integer> sumList = parallelSum100(map, 1000);
+        assertEquals(1, sumList.stream().distinct().count());
+        long wrongResultCount = sumList.stream().filter(num -> num != 100).count();
+        assertEquals(0, wrongResultCount);
+    }
+
+    @Test
+    public void givenHashMap_whenSumParallel_thenError() throws Exception {
+        Map<String, Integer> map = new HashMap<>();
+        List<Integer> sumList = parallelSum100(map, 100);
+        assertNotEquals(1, sumList.stream().distinct().count());
+        long wrongResultCount = sumList.stream().filter(num -> num != 100).count();
+        assertTrue(wrongResultCount > 0);
+    }
+
+    private List<Integer> parallelSum100(Map<String, Integer> map, int executionTimes) throws InterruptedException {
+        List<Integer> sumList = new ArrayList<>(1000);
+        for (int i = 0; i < executionTimes; i++) {
+            map.put("test", 0);
+            ExecutorService executorService = Executors.newFixedThreadPool(4);
+            for (int j = 0; j < 10; j++) {
+                executorService.execute(() -> {
+                    for (int k = 0; k < 10; k++)
+                        map.computeIfPresent("test", (key, value) -> value + 1);
+                });
+            }
+            executorService.shutdown();
+            executorService.awaitTermination(5, TimeUnit.SECONDS);
+            sumList.add(map.get("test"));
+        }
+        return sumList;
+    }
+
+}

core-java/src/test/java/com/baeldung/java/conversion/IterableStreamConversionTest.java

@@ -24,8 +24,7 @@ public class IterableStreamConversionTest {
     public void whenConvertedToList_thenCorrect() {
         Iterable<String> iterable = Arrays.asList("Testing", "Iterable", "conversion", "to", "Stream");
 
-        List<String> result = StreamSupport.stream(iterable.spliterator(), false)
+        List<String> result = StreamSupport.stream(iterable.spliterator(), false).map(String::toUpperCase).collect(Collectors.toList());
-          .map(String::toUpperCase).collect(Collectors.toList());
 
         assertThat(result, contains("TESTING", "ITERABLE", "CONVERSION", "TO", "STREAM"));
     }

core-java/src/test/java/com/baeldung/java/map/MapTest.java

@@ -201,8 +201,6 @@ public class MapTest {
         assertEquals("val1", rtnVal);
     }
 
-
-
     @Test
     public void whenCallsEqualsOnCollision_thenCorrect() {
         HashMap<MyKey, String> map = new HashMap<>();
@@ -311,13 +309,7 @@ public class MapTest {
 
     @Test
     public void givenTreeMap_whenOrdersEntriesByComparator_thenCorrect() {
-        TreeMap<Integer, String> map = new TreeMap<>(new Comparator<Integer>() {
+        TreeMap<Integer, String> map = new TreeMap<>(Comparator.reverseOrder());
-
-            @Override
-            public int compare(Integer o1, Integer o2) {
-                return o2 - o1;
-            }
-        });
         map.put(3, "val");
         map.put(2, "val");
         map.put(1, "val");

core-java/src/test/java/com/baeldung/java8/Java8FindAnyFindFirstTest.java

@@ -1,6 +1,5 @@
 package com.baeldung.java8;
 
-
 import org.junit.Test;
 
 import java.util.Arrays;
@@ -25,6 +24,15 @@ public class Java8FindAnyFindFirstTest {
         assertThat(result.get(), anyOf(is("A"), is("B"), is("C"), is("D")));
     }
 
+    @Test
+    public void createParallelStream_whenFindAnyResultIsPresent_thenCorrect() throws Exception {
+        List<Integer> list = Arrays.asList(1, 2, 3, 4, 5);
+        Optional<Integer> result = list.stream().parallel().filter(num -> num < 4).findAny();
+
+        assertTrue(result.isPresent());
+        assertThat(result.get(), anyOf(is(1), is(2), is(3)));
+    }
+
     @Test
     public void createStream_whenFindFirstResultIsPresent_thenCorrect() {
 

core-java/src/test/java/com/baeldung/scripting/NashornTest.java

@@ -56,9 +56,7 @@ public class NashornTest {
         Map<String, Object> map = (Map<String, Object>) obj;
 
         Assert.assertEquals("hello", map.get("greet"));
-        Assert.assertTrue(List.class.isAssignableFrom(map
+        Assert.assertTrue(List.class.isAssignableFrom(map.get("primes").getClass()));
-          .get("primes")
-          .getClass()));
     }
 
     @Test

core-java/src/test/java/org/baeldung/java/streams/ThreadPoolInParallelStreamTest.java

@@ -0,0 +1,41 @@
+package org.baeldung.java.streams;
+
+import org.junit.Test;
+
+import java.util.ArrayList;
+import java.util.List;
+import java.util.concurrent.ExecutionException;
+import java.util.concurrent.ForkJoinPool;
+import java.util.stream.Collectors;
+import java.util.stream.LongStream;
+import java.util.stream.Stream;
+
+import static org.junit.Assert.assertEquals;
+import static org.junit.Assert.assertTrue;
+
+public class ThreadPoolInParallelStreamTest {
+    
+    @Test
+    public void giveRangeOfLongs_whenSummedInParallel_shouldBeEqualToExpectedTotal() 
+      throws InterruptedException, ExecutionException {
+        long firstNum = 1;
+        long lastNum = 1_000_000;
+
+        List<Long> aList = LongStream.rangeClosed(firstNum, lastNum).boxed()
+          .collect(Collectors.toList());
+
+        ForkJoinPool customThreadPool = new ForkJoinPool(4);
+        long actualTotal = customThreadPool.submit(() -> aList.parallelStream()
+          .reduce(0L, Long::sum)).get();
+        
+        assertEquals((lastNum + firstNum) * lastNum / 2, actualTotal);
+    }
+    
+    @Test
+    public void givenList_whenCallingParallelStream_shouldBeParallelStream(){
+        List<Long> aList = new ArrayList<>();
+        Stream<Long> parallelStream = aList.parallelStream();
+        
+        assertTrue(parallelStream.isParallel());
+    }
+}

couchbase-sdk/src/main/java/com/baeldung/couchbase/async/person/Person.java

@@ -9,7 +9,8 @@ public class Person implements CouchbaseEntity {
     private String name;
     private String homeTown;
 
-    Person() {}
+    Person() {
+    }
 
     public Person(Builder b) {
         this.id = b.id;

couchbase-sdk/src/main/java/com/baeldung/couchbase/async/person/PersonCrudService.java

@@ -13,9 +13,7 @@ import com.baeldung.couchbase.async.service.BucketService;
 public class PersonCrudService extends AbstractCrudService<Person> {
 
     @Autowired
-    public PersonCrudService(
+    public PersonCrudService(@Qualifier("TutorialBucketService") BucketService bucketService, PersonDocumentConverter converter) {
-      @Qualifier("TutorialBucketService") BucketService bucketService,
-      PersonDocumentConverter converter) {
         super(bucketService, converter);
     }
 

couchbase-sdk/src/main/java/com/baeldung/couchbase/async/person/PersonDocumentConverter.java

@@ -11,10 +11,7 @@ public class PersonDocumentConverter implements JsonDocumentConverter<Person> {
 
     @Override
     public JsonDocument toDocument(Person p) {
-        JsonObject content = JsonObject.empty()
+        JsonObject content = JsonObject.empty().put("type", "Person").put("name", p.getName()).put("homeTown", p.getHomeTown());
-                .put("type", "Person")
-                .put("name", p.getName())
-                .put("homeTown", p.getHomeTown());
         return JsonDocument.create(p.getId(), content);
     }
 

couchbase-sdk/src/main/java/com/baeldung/couchbase/async/person/RegistrationService.java

@@ -21,8 +21,7 @@ public class RegistrationService {
     public Person findRegistrant(String id) {
         try {
             return crud.read(id);
-        }
+        } catch (CouchbaseException e) {
-        catch(CouchbaseException e) {
             return crud.readFromReplica(id);
         }
     }

couchbase-sdk/src/main/java/com/baeldung/couchbase/async/service/AbstractCrudService.java

@@ -73,9 +73,7 @@ public abstract class AbstractCrudService<T extends CouchbaseEntity> implements
     @Override
     public List<T> readBulk(Iterable<String> ids) {
         final AsyncBucket asyncBucket = bucket.async();
-        Observable<JsonDocument> asyncOperation = Observable
+        Observable<JsonDocument> asyncOperation = Observable.from(ids).flatMap(new Func1<String, Observable<JsonDocument>>() {
-                .from(ids)
-                .flatMap(new Func1<String, Observable<JsonDocument>>() {
             public Observable<JsonDocument> call(String key) {
                 return asyncBucket.get(key);
             }
@@ -83,8 +81,7 @@ public abstract class AbstractCrudService<T extends CouchbaseEntity> implements
 
         final List<T> items = new ArrayList<T>();
         try {
-            asyncOperation.toBlocking()
+            asyncOperation.toBlocking().forEach(new Action1<JsonDocument>() {
-            .forEach(new Action1<JsonDocument>() {
                 public void call(JsonDocument doc) {
                     T item = converter.fromDocument(doc);
                     items.add(item);
@@ -100,9 +97,7 @@ public abstract class AbstractCrudService<T extends CouchbaseEntity> implements
     @Override
     public void createBulk(Iterable<T> items) {
         final AsyncBucket asyncBucket = bucket.async();
-        Observable
+        Observable.from(items).flatMap(new Func1<T, Observable<JsonDocument>>() {
-        .from(items)
-        .flatMap(new Func1<T, Observable<JsonDocument>>() {
             @SuppressWarnings("unchecked")
             @Override
             public Observable<JsonDocument> call(final T t) {
@@ -110,62 +105,34 @@ public abstract class AbstractCrudService<T extends CouchbaseEntity> implements
                     t.setId(UUID.randomUUID().toString());
                 }
                 JsonDocument doc = converter.toDocument(t);
-                return asyncBucket.insert(doc)
+                return asyncBucket.insert(doc).retryWhen(RetryBuilder.anyOf(BackpressureException.class).delay(Delay.exponential(TimeUnit.MILLISECONDS, 100)).max(10).build());
-                        .retryWhen(RetryBuilder
-                                .anyOf(BackpressureException.class)
-                                .delay(Delay.exponential(TimeUnit.MILLISECONDS, 100))
-                                .max(10)
-                                .build());
             }
-        })
+        }).last().toBlocking().single();
-        .last()
-        .toBlocking()
-        .single();
     }
 
     @Override
     public void updateBulk(Iterable<T> items) {
         final AsyncBucket asyncBucket = bucket.async();
-        Observable
+        Observable.from(items).flatMap(new Func1<T, Observable<JsonDocument>>() {
-        .from(items)
-        .flatMap(new Func1<T, Observable<JsonDocument>>() {
             @SuppressWarnings("unchecked")
             @Override
             public Observable<JsonDocument> call(final T t) {
                 JsonDocument doc = converter.toDocument(t);
-                return asyncBucket.upsert(doc)
+                return asyncBucket.upsert(doc).retryWhen(RetryBuilder.anyOf(BackpressureException.class).delay(Delay.exponential(TimeUnit.MILLISECONDS, 100)).max(10).build());
-                        .retryWhen(RetryBuilder
-                                .anyOf(BackpressureException.class)
-                                .delay(Delay.exponential(TimeUnit.MILLISECONDS, 100))
-                                .max(10)
-                                .build());
             }
-        })
+        }).last().toBlocking().single();
-        .last()
-        .toBlocking()
-        .single();
     }
 
     @Override
     public void deleteBulk(Iterable<String> ids) {
         final AsyncBucket asyncBucket = bucket.async();
-        Observable
+        Observable.from(ids).flatMap(new Func1<String, Observable<JsonDocument>>() {
-        .from(ids)
-        .flatMap(new Func1<String, Observable<JsonDocument>>() {
             @SuppressWarnings("unchecked")
             @Override
             public Observable<JsonDocument> call(String key) {
-                return asyncBucket.remove(key)
+                return asyncBucket.remove(key).retryWhen(RetryBuilder.anyOf(BackpressureException.class).delay(Delay.exponential(TimeUnit.MILLISECONDS, 100)).max(10).build());
-                        .retryWhen(RetryBuilder
-                                .anyOf(BackpressureException.class)
-                                .delay(Delay.exponential(TimeUnit.MILLISECONDS, 100))
-                                .max(10)
-                                .build());
             }
-        })
+        }).last().toBlocking().single();
-        .last()
-        .toBlocking()
-        .single();
     }
 
     @Override

couchbase-sdk/src/main/java/com/baeldung/couchbase/intro/CodeSnippets.java

@@ -20,10 +20,7 @@ public class CodeSnippets {
     }
 
     static Cluster loadClusterWithCustomEnvironment() {
-        CouchbaseEnvironment env = DefaultCouchbaseEnvironment.builder()
+        CouchbaseEnvironment env = DefaultCouchbaseEnvironment.builder().connectTimeout(10000).kvTimeout(3000).build();
-                .connectTimeout(10000)
-                .kvTimeout(3000)
-                .build();        
         return CouchbaseCluster.create(env, "localhost");
     }
 
@@ -36,12 +33,7 @@ public class CodeSnippets {
     }
 
     static JsonDocument insertExample(Bucket bucket) {
-        JsonObject content = JsonObject.empty()
+        JsonObject content = JsonObject.empty().put("name", "John Doe").put("type", "Person").put("email", "john.doe@mydomain.com").put("homeTown", "Chicago");
-                .put("name", "John Doe")
-                .put("type", "Person")
-                .put("email", "john.doe@mydomain.com")
-                .put("homeTown", "Chicago")
-                ;
         String id = UUID.randomUUID().toString();
         JsonDocument document = JsonDocument.create(id, content);
         JsonDocument inserted = bucket.insert(document);
@@ -72,8 +64,7 @@ public class CodeSnippets {
     static JsonDocument getFirstFromReplicaExample(Bucket bucket, String id) {
         try {
             return bucket.get(id);
-        }
+        } catch (CouchbaseException e) {
-        catch(CouchbaseException e) {
             List<JsonDocument> list = bucket.getFromReplica(id, ReplicaMode.FIRST);
             if (!list.isEmpty()) {
                 return list.get(0);

couchbase-sdk/src/main/java/com/baeldung/couchbase/spring/person/Person.java

@@ -7,7 +7,8 @@ public class Person {
     private String name;
     private String homeTown;
 
-    Person() {}
+    Person() {
+    }
 
     public Person(Builder b) {
         this.id = b.id;

couchbase-sdk/src/main/java/com/baeldung/couchbase/spring/person/PersonDocumentConverter.java

@@ -11,10 +11,7 @@ public class PersonDocumentConverter implements JsonDocumentConverter<Person> {
 
     @Override
     public JsonDocument toDocument(Person p) {
-        JsonObject content = JsonObject.empty()
+        JsonObject content = JsonObject.empty().put("type", "Person").put("name", p.getName()).put("homeTown", p.getHomeTown());
-                .put("type", "Person")
-                .put("name", p.getName())
-                .put("homeTown", p.getHomeTown());
         return JsonDocument.create(p.getId(), content);
     }
 

couchbase-sdk/src/main/java/com/baeldung/couchbase/spring/person/RegistrationService.java

@@ -21,8 +21,7 @@ public class RegistrationService {
     public Person findRegistrant(String id) {
         try {
             return crud.read(id);
-        }
+        } catch (CouchbaseException e) {
-        catch(CouchbaseException e) {
             return crud.readFromReplica(id);
         }
     }

couchbase-sdk/src/main/java/com/baeldung/couchbase/spring/service/ClusterServiceImpl.java

@@ -59,9 +59,7 @@ public class ClusterServiceImpl implements ClusterService {
 
     @Override
     public List<JsonDocument> getDocumentsAsync(final AsyncBucket asyncBucket, Iterable<String> keys) {
-        Observable<JsonDocument> asyncBulkGet = Observable
+        Observable<JsonDocument> asyncBulkGet = Observable.from(keys).flatMap(new Func1<String, Observable<JsonDocument>>() {
-                .from(keys)
-                .flatMap(new Func1<String, Observable<JsonDocument>>() {
             public Observable<JsonDocument> call(String key) {
                 return asyncBucket.get(key);
             }
@@ -69,8 +67,7 @@ public class ClusterServiceImpl implements ClusterService {
 
         final List<JsonDocument> docs = new ArrayList<>();
         try {
-            asyncBulkGet.toBlocking()
+            asyncBulkGet.toBlocking().forEach(new Action1<JsonDocument>() {
-            .forEach(new Action1<JsonDocument>() {
                 public void call(JsonDocument doc) {
                     docs.add(doc);
                 }

couchbase-sdk/src/test/java/com/baeldung/couchbase/async/person/PersonCrudServiceIntegrationTest.java

@@ -207,17 +207,10 @@ public class PersonCrudServiceIntegrationTest extends AsyncIntegrationTest {
     }
 
     private Person randomPerson() {
-        return Person.Builder.newInstance()
+        return Person.Builder.newInstance().name(RandomStringUtils.randomAlphabetic(10)).homeTown(RandomStringUtils.randomAlphabetic(10)).build();
-          .name(RandomStringUtils.randomAlphabetic(10))
-          .homeTown(RandomStringUtils.randomAlphabetic(10))
-          .build();
     }
 
     private Person randomPersonWithId() {
-        return Person.Builder.newInstance()
+        return Person.Builder.newInstance().id(UUID.randomUUID().toString()).name(RandomStringUtils.randomAlphabetic(10)).homeTown(RandomStringUtils.randomAlphabetic(10)).build();
-          .id(UUID.randomUUID().toString())
-          .name(RandomStringUtils.randomAlphabetic(10))
-          .homeTown(RandomStringUtils.randomAlphabetic(10))
-          .build();
     }
 }

couchbase-sdk/src/test/java/com/baeldung/couchbase/spring/person/PersonCrudServiceIntegrationTest.java

@@ -66,17 +66,10 @@ public class PersonCrudServiceIntegrationTest extends IntegrationTest {
     }
 
     private Person buildClarkKent() {
-        return Person.Builder.newInstance()
+        return Person.Builder.newInstance().id(CLARK_KENT_ID).name(CLARK_KENT).homeTown(SMALLVILLE).build();
-          .id(CLARK_KENT_ID)
-          .name(CLARK_KENT)
-          .homeTown(SMALLVILLE)
-          .build();
     }
 
     private Person randomPerson() {
-        return Person.Builder.newInstance()
+        return Person.Builder.newInstance().name(RandomStringUtils.randomAlphabetic(10)).homeTown(RandomStringUtils.randomAlphabetic(10)).build();
-          .name(RandomStringUtils.randomAlphabetic(10))
-          .homeTown(RandomStringUtils.randomAlphabetic(10))
-          .build();
     }
 }

deltaspike/src/main/java/baeldung/data/MemberRepository.java

@@ -35,9 +35,6 @@ public abstract class MemberRepository extends AbstractEntityRepository<Member,
 
     public List<Member> findAllOrderedByNameWithQueryDSL() {
         final QMember member = QMember.member;
-        return jpaQuery()
+        return jpaQuery().from(member).orderBy(member.email.asc()).list(member);
-                .from(member)
-                .orderBy(member.email.asc())
-                .list(member);
     }
 }

deltaspike/src/main/java/baeldung/service/MemberRegistration.java

@@ -64,7 +64,6 @@ public class MemberRegistration {
         }
     }
 
-
     public void register(Member member) throws Exception {
         log.info("Registering " + member.getName());
         validateMember(member);

deltaspike/src/test/java/baeldung/test/MemberRegistrationTest.java

@@ -41,27 +41,13 @@ import org.junit.runner.RunWith;
 public class MemberRegistrationTest {
     @Deployment
     public static Archive<?> createTestArchive() {
-        File[] files = Maven.resolver().loadPomFromFile("pom.xml")
+        File[] files = Maven.resolver().loadPomFromFile("pom.xml").importRuntimeDependencies().resolve().withTransitivity().asFile();
-                .importRuntimeDependencies().resolve().withTransitivity().asFile();
 
         return ShrinkWrap.create(WebArchive.class, "test.war")
-                .addClasses(
+                .addClasses(EntityManagerProducer.class, Member.class, MemberRegistration.class, MemberRepository.class, Resources.class, QueryDslRepositoryExtension.class, QueryDslSupport.class, SecondaryPersistenceUnit.class,
-                        EntityManagerProducer.class,
+                        SecondaryEntityManagerProducer.class, SecondaryEntityManagerResolver.class)
-                        Member.class,
+                .addAsResource("META-INF/test-persistence.xml", "META-INF/persistence.xml").addAsResource("META-INF/apache-deltaspike.properties").addAsWebInfResource(EmptyAsset.INSTANCE, "beans.xml").addAsWebInfResource("test-ds.xml")
-                        MemberRegistration.class,
+                .addAsWebInfResource("test-secondary-ds.xml").addAsLibraries(files);
-                        MemberRepository.class,
-                        Resources.class,
-                        QueryDslRepositoryExtension.class,
-                        QueryDslSupport.class,
-                        SecondaryPersistenceUnit.class,
-                        SecondaryEntityManagerProducer.class,
-                        SecondaryEntityManagerResolver.class)
-                .addAsResource("META-INF/test-persistence.xml", "META-INF/persistence.xml")
-                .addAsResource("META-INF/apache-deltaspike.properties")
-                .addAsWebInfResource(EmptyAsset.INSTANCE, "beans.xml")
-                .addAsWebInfResource("test-ds.xml")
-                .addAsWebInfResource("test-secondary-ds.xml")
-                .addAsLibraries(files);
     }
 
     @Inject

disruptor/pom.xml

@@ -0,0 +1,251 @@
+<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>disruptor</artifactId>
+    <version>0.1.0-SNAPSHOT</version>
+    <packaging>jar</packaging>
+
+    <name>disruptor</name>
+
+    <dependencies>
+
+        <!-- utils -->
+        <dependency>
+            <groupId>org.apache.commons</groupId>
+            <artifactId>commons-lang3</artifactId>
+            <version>${commons-lang3.version}</version>
+        </dependency>
+        
+        <dependency>
+            <groupId>com.lmax</groupId>
+            <artifactId>disruptor</artifactId>
+            <version>${disruptor.version}</version>
+        </dependency>
+
+        <!-- logging -->
+
+        <dependency>
+            <groupId>org.slf4j</groupId>
+            <artifactId>slf4j-api</artifactId>
+            <version>${org.slf4j.version}</version>
+        </dependency>
+        <dependency>
+            <groupId>ch.qos.logback</groupId>
+            <artifactId>logback-classic</artifactId>
+            <version>${logback.version}</version>
+        </dependency>
+        <dependency>
+            <groupId>org.slf4j</groupId>
+            <artifactId>jcl-over-slf4j</artifactId>
+            <version>${org.slf4j.version}</version>
+        </dependency>
+        <dependency>
+            <groupId>org.slf4j</groupId>
+            <artifactId>log4j-over-slf4j</artifactId>
+            <version>${org.slf4j.version}</version>
+        </dependency>
+
+        <!-- test scoped -->
+
+        <dependency>
+            <groupId>org.hamcrest</groupId>
+            <artifactId>hamcrest-all</artifactId>
+            <version>1.3</version>
+            <scope>test</scope>
+        </dependency>
+
+        <dependency>
+            <groupId>junit</groupId>
+            <artifactId>junit</artifactId>
+            <version>${junit.version}</version>
+            <scope>test</scope>
+        </dependency>
+
+        <dependency>
+            <groupId>org.hamcrest</groupId>
+            <artifactId>hamcrest-core</artifactId>
+            <version>${org.hamcrest.version}</version>
+            <scope>test</scope>
+        </dependency>
+        <dependency>
+            <groupId>org.hamcrest</groupId>
+            <artifactId>hamcrest-library</artifactId>
+            <version>${org.hamcrest.version}</version>
+            <scope>test</scope>
+        </dependency>
+
+    </dependencies>
+
+    <build>
+        <finalName>disruptor</finalName>
+        <resources>
+            <resource>
+                <directory>src/main/resources</directory>
+                <filtering>true</filtering>
+            </resource>
+        </resources>
+
+        <plugins>
+
+            <plugin>
+                <groupId>org.apache.maven.plugins</groupId>
+                <artifactId>maven-compiler-plugin</artifactId>
+                <version>${maven-compiler-plugin.version}</version>
+                <configuration>
+                    <source>1.8</source>
+                    <target>1.8</target>
+                </configuration>
+            </plugin>
+
+            <plugin>
+                <groupId>org.apache.maven.plugins</groupId>
+                <artifactId>maven-surefire-plugin</artifactId>
+                <version>${maven-surefire-plugin.version}</version>
+            </plugin>
+
+            <plugin>
+                <groupId>org.apache.maven.plugins</groupId>
+                <artifactId>maven-dependency-plugin</artifactId>
+                <executions>
+                    <execution>
+                        <id>copy-dependencies</id>
+                        <phase>prepare-package</phase>
+                        <goals>
+                            <goal>copy-dependencies</goal>
+                        </goals>
+                        <configuration>
+                            <outputDirectory>${project.build.directory}/libs</outputDirectory>
+                        </configuration>
+                    </execution>
+                </executions>
+            </plugin>
+
+            <plugin>
+                <groupId>org.apache.maven.plugins</groupId>
+                <artifactId>maven-jar-plugin</artifactId>
+                <configuration>
+                    <archive>
+                        <manifest>
+                            <addClasspath>true</addClasspath>
+                            <classpathPrefix>libs/</classpathPrefix>
+                            <mainClass>org.baeldung.executable.ExecutableMavenJar</mainClass>
+                        </manifest>
+                    </archive>
+                </configuration>
+            </plugin>
+
+            <plugin>
+                <groupId>org.apache.maven.plugins</groupId>
+                <artifactId>maven-assembly-plugin</artifactId>
+                <executions>
+                    <execution>
+                        <phase>package</phase>
+                        <goals>
+                            <goal>single</goal>
+                        </goals>
+                        <configuration>
+                            <archive>
+                                <manifest>
+                                    <mainClass>org.baeldung.executable.ExecutableMavenJar</mainClass>
+                                </manifest>
+                            </archive>
+                            <descriptorRefs>
+                                <descriptorRef>jar-with-dependencies</descriptorRef>
+                            </descriptorRefs>
+                        </configuration>
+                    </execution>
+                </executions>
+            </plugin>
+
+            <plugin>
+                <groupId>org.apache.maven.plugins</groupId>
+                <artifactId>maven-shade-plugin</artifactId>
+                <executions>
+                    <execution>
+                        <goals>
+                            <goal>shade</goal>
+                        </goals>
+                        <configuration>
+                            <shadedArtifactAttached>true</shadedArtifactAttached>
+                            <transformers>
+                                <transformer implementation="org.apache.maven.plugins.shade.resource.ManifestResourceTransformer">
+                                    <mainClass>org.baeldung.executable.ExecutableMavenJar</mainClass>
+                                </transformer>
+                            </transformers>
+                        </configuration>
+                    </execution>
+                </executions>
+            </plugin>
+
+            <plugin>
+                <groupId>com.jolira</groupId>
+                <artifactId>onejar-maven-plugin</artifactId>
+                <executions>
+                    <execution>
+                        <configuration>
+                            <mainClass>org.baeldung.executable.ExecutableMavenJar</mainClass>
+                            <attachToBuild>true</attachToBuild>
+                            <filename>${project.build.finalName}-onejar.${project.packaging}</filename>
+                        </configuration>
+                        <goals>
+                            <goal>one-jar</goal>
+                        </goals>
+                    </execution>
+                </executions>
+            </plugin>
+
+        </plugins>
+
+    </build>
+
+    <profiles>
+        <profile>
+            <id>integration</id>
+            <build>
+                <plugins>
+                    <plugin>
+                        <groupId>org.apache.maven.plugins</groupId>
+                        <artifactId>maven-surefire-plugin</artifactId>
+                        <executions>
+                            <execution>
+                                <phase>integration-test</phase>
+                                <goals>
+                                    <goal>test</goal>
+                                </goals>
+                            </execution>
+                        </executions>
+                        <configuration>
+                            <systemPropertyVariables>
+                                <test.mime>json</test.mime>
+                            </systemPropertyVariables>
+                        </configuration>
+                    </plugin>
+                </plugins>
+            </build>
+        </profile>
+    </profiles>
+
+    <properties>
+        <!-- logging -->
+        <org.slf4j.version>1.7.21</org.slf4j.version>
+        <logback.version>1.1.7</logback.version>
+
+        <!-- util -->
+        <commons-lang3.version>3.5</commons-lang3.version>
+        <disruptor.version>3.3.6</disruptor.version>
+
+        <!-- testing -->
+        <org.hamcrest.version>1.3</org.hamcrest.version>
+        <junit.version>4.12</junit.version>
+        <mockito.version>1.10.19</mockito.version>
+        <testng.version>6.10</testng.version>
+        <assertj.version>3.6.1</assertj.version>
+
+        <!-- maven plugins -->
+        <maven-compiler-plugin.version>3.6.0</maven-compiler-plugin.version>
+        <maven-surefire-plugin.version>2.19.1</maven-surefire-plugin.version>
+
+    </properties>
+
+</project>

feign/src/main/java/com/baeldung/feign/BookControllerFeignClientBuilder.java

@@ -11,16 +11,9 @@ import lombok.Getter;
 
 @Getter
 public class BookControllerFeignClientBuilder {
-    private BookClient bookClient = createClient(BookClient.class,
+    private BookClient bookClient = createClient(BookClient.class, "http://localhost:8081/api/books");
-      "http://localhost:8081/api/books");
 
     private static <T> T createClient(Class<T> type, String uri) {
-        return Feign.builder()
+        return Feign.builder().client(new OkHttpClient()).encoder(new GsonEncoder()).decoder(new GsonDecoder()).logger(new Slf4jLogger(type)).logLevel(Logger.Level.FULL).target(type, uri);
-          .client(new OkHttpClient())
-          .encoder(new GsonEncoder())
-          .decoder(new GsonDecoder())
-          .logger(new Slf4jLogger(type))
-          .logLevel(Logger.Level.FULL)
-          .target(type, uri);
     }
 }

feign/src/test/java/com/baeldung/feign/clients/BookClientTest.java

@@ -31,9 +31,7 @@ public class BookClientTest {
 
     @Test
     public void givenBookClient_shouldRunSuccessfully() throws Exception {
-        List<Book> books = bookClient.findAll().stream()
+        List<Book> books = bookClient.findAll().stream().map(BookResource::getBook).collect(Collectors.toList());
-          .map(BookResource::getBook)
-          .collect(Collectors.toList());
         assertTrue(books.size() > 2);
         log.info("{}", books);
     }

guava/pom.xml

@@ -57,6 +57,12 @@
             <scope>test</scope>
         </dependency>
 
+        <dependency>
+            <groupId>org.assertj</groupId>
+            <artifactId>assertj-core</artifactId>
+            <version>${assertj.version}</version>
+            <scope>test</scope>
+        </dependency>
     </dependencies>
 
     <build>
@@ -100,6 +106,7 @@
         <org.hamcrest.version>1.3</org.hamcrest.version>
         <junit.version>4.12</junit.version>
         <mockito.version>1.10.19</mockito.version>
+        <assertj.version>3.6.1</assertj.version>
 
         <!-- maven plugins -->
         <maven-compiler-plugin.version>3.6.0</maven-compiler-plugin.version>

guava/src/test/java/org/baeldung/guava/CustomEvent.java

@@ -0,0 +1,18 @@
+package org.baeldung.guava;
+
+
+public class CustomEvent {
+    private String action;
+
+    public CustomEvent(String action) {
+        this.action = action;
+    }
+
+    public String getAction() {
+        return action;
+    }
+
+    public void setAction(String action) {
+        this.action = action;
+    }
+}

guava/src/test/java/org/baeldung/guava/EventBusWrapper.java

@@ -0,0 +1,22 @@
+package org.baeldung.guava;
+
+import com.google.common.eventbus.EventBus;
+
+class EventBusWrapper {
+
+    private static EventBus eventBus = new EventBus();
+
+    static void register(Object object){
+        eventBus.register(object);
+    }
+
+    static void unregister(Object object){
+        eventBus.unregister(object);
+    }
+
+    static void post(Object object){
+        eventBus.post(object);
+    }
+
+
+}

guava/src/test/java/org/baeldung/guava/EventListener.java

@@ -0,0 +1,33 @@
+package org.baeldung.guava;
+import com.google.common.eventbus.Subscribe;
+
+public class EventListener {
+
+    private static int eventsHandled;
+
+    /**
+     * Handles events of type String     *
+     */
+    @Subscribe
+    public void stringEvent(String event){
+        System.out.println("do event ["+event+"]");
+        eventsHandled++;
+    }
+
+    /**
+     * Handles events of type CustomEvent
+     */
+    @Subscribe
+    public void someEvent(CustomEvent customEvent){
+        System.out.println("do event ["+ customEvent.getAction()+"]");
+        eventsHandled++;
+    }
+
+    public int getEventsHandled() {
+        return eventsHandled;
+    }
+
+    public void resetEventsHandled(){
+        eventsHandled = 0;
+    }
+}

guava/src/test/java/org/baeldung/guava/GuavaEventBusTest.java

@@ -0,0 +1,42 @@
+package org.baeldung.guava;
+
+import org.junit.After;
+import org.junit.Before;
+import org.junit.Test;
+
+import static org.junit.Assert.*;
+
+public class GuavaEventBusTest {
+
+    private EventListener listener;
+
+    @Before
+    public void setUp() throws Exception {
+        listener = new EventListener();
+        EventBusWrapper.register(listener);
+    }
+
+    @After
+    public void tearDown() throws Exception {
+        EventBusWrapper.unregister(listener);
+    }
+
+    @Test
+    public void givenStringEvent_whenEventHandled_thenSuccess() throws Exception {
+        listener.resetEventsHandled();
+
+        EventBusWrapper.post("String Event");
+        assertEquals(1, listener.getEventsHandled());
+
+    }
+
+    @Test
+    public void givenCustomEvent_whenEventHandled_thenSuccess() throws Exception {
+        listener.resetEventsHandled();
+
+        CustomEvent customEvent = new CustomEvent("Custom Event");
+        EventBusWrapper.post(customEvent);
+
+        assertEquals(1, listener.getEventsHandled());
+    }
+}