Merge branch 'eugenp:master' into master

core-java-modules/core-java-16/src/main/java/com/baeldung/instanceof_alternatives/enumallt/DinosaurEnum.java

@@ -0,0 +1,19 @@
+package com.baeldung.instanceofalternative.enumallt;
+
+public enum DinosaurEnum {
+    Anatotitan {
+        @Override
+        public String move() {
+            return "running";
+        }
+    },
+    Euraptor {
+        @Override
+        public String move() {
+            return "flying";
+        }
+    };
+
+    public abstract String move();
+
+}

core-java-modules/core-java-16/src/main/java/com/baeldung/instanceof_alternatives/model/Anatotitan.java

@@ -0,0 +1,15 @@
+package com.baeldung.instanceofalternative.model;
+
+public class Anatotitan extends Dinosaur {
+    // polymorphism
+    @Override
+    public String move() {
+        return "running";
+    }
+
+    // non-polymorphism
+    public String run() {
+        return "running";
+    }
+
+}

core-java-modules/core-java-16/src/main/java/com/baeldung/instanceof_alternatives/model/Dinosaur.java

@@ -0,0 +1,9 @@
+package com.baeldung.instanceofalternative.model;
+
+public class Dinosaur {
+
+    public String move() {
+        return "default movement";
+    }
+
+}

core-java-modules/core-java-16/src/main/java/com/baeldung/instanceof_alternatives/model/Euraptor.java

@@ -0,0 +1,15 @@
+package com.baeldung.instanceofalternative.model;
+
+public class Euraptor extends Dinosaur {
+    // polymorphism
+    @Override
+    public String move() {
+        return "flying";
+    }
+
+    // non-polymorphism
+    public String flies() {
+        return "flying";
+    }
+
+}

core-java-modules/core-java-16/src/main/java/com/baeldung/instanceof_alternatives/visitorspattern/Anatotitan.java

@@ -0,0 +1,14 @@
+package com.baeldung.instanceofalternative.visitorspattern;
+
+public class Anatotitan implements Dino {
+
+    String run() {
+        return "running";
+    }
+
+    @Override
+    public String move(Visitor dinobehave) {
+        return dinobehave.visit(this);
+    }
+
+}

core-java-modules/core-java-16/src/main/java/com/baeldung/instanceof_alternatives/visitorspattern/Dino.java

@@ -0,0 +1,7 @@
+package com.baeldung.instanceofalternative.visitorspattern;
+
+public interface Dino {
+
+    String move(Visitor dinoMove);
+
+}

core-java-modules/core-java-16/src/main/java/com/baeldung/instanceof_alternatives/visitorspattern/DinoVisitorImpl.java

@@ -0,0 +1,15 @@
+package com.baeldung.instanceofalternative.visitorspattern;
+
+public class DinoVisitorImpl implements Visitor {
+
+    @Override
+    public String visit(Anatotitan anatotitan) {
+        return anatotitan.run();
+    }
+
+    @Override
+    public String visit(Euraptor euraptor) {
+        return euraptor.flies();
+    }
+
+}

core-java-modules/core-java-16/src/main/java/com/baeldung/instanceof_alternatives/visitorspattern/Euraptor.java

@@ -0,0 +1,14 @@
+package com.baeldung.instanceofalternative.visitorspattern;
+
+public class Euraptor implements Dino {
+
+    String flies() {
+        return "flying";
+    }
+
+    @Override
+    public String move(Visitor dinobehave) {
+        return dinobehave.visit(this);
+    }
+
+}

core-java-modules/core-java-16/src/main/java/com/baeldung/instanceof_alternatives/visitorspattern/Visitor.java

@@ -0,0 +1,9 @@
+package com.baeldung.instanceofalternative.visitorspattern;
+
+public interface Visitor {
+
+    String visit(Anatotitan anatotitan);
+
+    String visit(Euraptor euraptor);
+
+}

core-java-modules/core-java-16/src/test/java/com/baeldung/instanceof_alternative_test/EnumUnitTest.java

@@ -0,0 +1,26 @@
+package com.baeldung.instanceoftest;
+
+import static org.junit.Assert.*;
+
+import org.junit.Test;
+
+import com.baeldung.instanceofalternative.enumallt.*;
+
+public class EnumUnitTest {
+    @Test
+    public void givenADinosaurSpecie_whenUsingEnum_thenGetMovementOfEuraptor() {
+
+        assertEquals("flying", moveDinosaurUsingEnum(DinosaurEnum.Euraptor));
+    }
+
+    @Test
+    public void givenADinosaurSpecie_whenUsingEnum_thenGetMovementOfAnatotitan() {
+        assertEquals("running", moveDinosaurUsingEnum(DinosaurEnum.Anatotitan));
+    }
+
+    public static String moveDinosaurUsingEnum(DinosaurEnum dinosaurenum) {
+        return dinosaurenum.move();
+
+    }
+
+}

core-java-modules/core-java-16/src/test/java/com/baeldung/instanceof_alternative_test/ExampleSetupUnitTest.java

@@ -0,0 +1,35 @@
+package com.baeldung.instanceoftest;
+
+import static org.junit.Assert.*;
+
+import org.junit.Test;
+
+import com.baeldung.instanceofalternative.model.*;
+
+public class ExampleSetupUnitTest {
+
+    @Test
+    public void givenADinosaurSpecie_whenUsingInstancof_thenGetMovementOfAnatotitan() {
+
+        assertEquals("running", moveDinosaurUsingInstanceof(new Anatotitan()));
+    }
+
+    @Test
+    public void givenADinosaurSpecie_whenUsingInstanceof_thenGetMovementOfEuraptor() {
+        assertEquals("flying", moveDinosaurUsingInstanceof(new Euraptor()));
+    }
+
+    public static String moveDinosaurUsingInstanceof(Dinosaur dinosaur) {
+
+        if (dinosaur instanceof Anatotitan) {
+
+            Anatotitan anatotitan = (Anatotitan) dinosaur;
+            return anatotitan.run();
+        } else if (dinosaur instanceof Euraptor) {
+            Euraptor euraptor = (Euraptor) dinosaur;
+            return euraptor.flies();
+        }
+        return "";
+    }
+
+}

core-java-modules/core-java-16/src/test/java/com/baeldung/instanceof_alternative_test/GetClassUnitTest.java

@@ -0,0 +1,36 @@
+package com.baeldung.instanceoftest;
+
+import static org.junit.Assert.*;
+import org.junit.Test;
+
+import com.baeldung.instanceofalternative.model.*;
+
+public class GetClassUnitTest {
+
+    @Test
+    public void givenADinosaurSpecie_whenUsingGetClass_thenGetMovementOfAnatotitan() {
+
+        assertEquals("running", moveDinosaurUsingGetClass(new Anatotitan()));
+    }
+
+    @Test
+    public void givenADinosaurSpecie_whenUsingGetClass_thenGetMovementOfEuraptor() {
+        assertEquals("flying", moveDinosaurUsingGetClass(new Euraptor()));
+    }
+
+    public static String moveDinosaurUsingGetClass(Dinosaur dinosaur) {
+
+        if (dinosaur.getClass()
+            .equals(Anatotitan.class)) {
+
+            Anatotitan anatotitan = (Anatotitan) dinosaur;
+            return anatotitan.run();
+        } else if (dinosaur.getClass()
+            .equals(Euraptor.class)) {
+            Euraptor euraptor = (Euraptor) dinosaur;
+            return euraptor.flies();
+        }
+        return "";
+    }
+
+}

core-java-modules/core-java-16/src/test/java/com/baeldung/instanceof_alternative_test/PolymorphismUnitTest.java

@@ -0,0 +1,27 @@
+package com.baeldung.instanceoftest;
+
+import static org.junit.Assert.*;
+
+import org.junit.BeforeClass;
+import org.junit.Test;
+
+import com.baeldung.instanceofalternative.model.*;
+
+public class PolymorphismUnitTest {
+
+    @Test
+    public void givenADinosaurSpecie_whenUsingPolymorphism_thenGetMovementOfAnatotitan() {
+
+        assertEquals("running", moveDinosaurUsingPolymorphism(new Anatotitan()));
+    }
+
+    @Test
+    public void givenADinosaurSpecie_whenUsingPolymorphism_thenGetMovementOfEuraptor() {
+        assertEquals("flying", moveDinosaurUsingPolymorphism(new Euraptor()));
+    }
+
+    public static String moveDinosaurUsingPolymorphism(Dinosaur dinosaur) {
+        return dinosaur.move();
+    }
+
+}

core-java-modules/core-java-16/src/test/java/com/baeldung/instanceof_alternative_test/VisitorsPatternUnitTest.java

@@ -0,0 +1,29 @@
+package com.baeldung.instanceoftest;
+
+import static org.junit.Assert.*;
+
+import org.junit.Test;
+
+import com.baeldung.instanceofalternative.visitorspattern.*;
+
+public class VisitorsPatternUnitTest {
+
+    @Test
+    public void givenADinosaurSpecie_whenUsingVisitorPattern_thenGetMovementOfAnatotitan() {
+
+        assertEquals("running", moveDinosaurUsingVisitorPattern((Dino) new Anatotitan()));
+    }
+
+    @Test
+    public void givenADinosaurSpecie_whenUsingVisitorPattern_thenGetMovementOfEuraptor() {
+
+        assertEquals("flying", moveDinosaurUsingVisitorPattern((Dino) new Euraptor()));
+    }
+
+    public static String moveDinosaurUsingVisitorPattern(Dino dinosaur) {
+        Visitor visitor = new DinoVisitorImpl();
+
+        return dinosaur.move(visitor);
+    }
+
+}

core-java-modules/core-java-exceptions-4/src/main/java/com/baeldung/exception/exceptions_vs_errors/ErrorExample.java

@@ -3,12 +3,7 @@ package com.baeldung.exception.exceptions_vs_errors;
 public class ErrorExample {
 
     public static void main(String[] args) {
-        overflow();
+        throw new AssertionError();
-    }
-
-    public static void overflow() {
-        System.out.println("overflow...");
-        overflow();
     }
 
 }

core-java-modules/core-java-exceptions-4/src/test/java/com/baeldung/exception/exceptions_vs_errors/ErrorExampleUnitTest.java

@@ -3,11 +3,11 @@ package com.baeldung.exception.exceptions_vs_errors;
 import org.junit.Test;
 import org.junit.jupiter.api.Assertions;
 
-// Unit test for the ErrorExample class.
 public class ErrorExampleUnitTest {
+
     @Test
     public void whenMainMethodIsRun_thenStackOverflowError() {
-        Assertions.assertThrows(StackOverflowError.class, 
+        Assertions.assertThrows(AssertionError.class,
-            () -> ErrorExample.main(null));
+          () -> ErrorExample.main(null));
     }
 }

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

@@ -14,5 +14,4 @@ This module contains articles about working with the Java Virtual Machine (JVM).
 - [An Introduction to the Constant Pool in the JVM](https://www.baeldung.com/jvm-constant-pool)
 - [List All the Classes Loaded in the JVM](https://www.baeldung.com/jvm-list-all-classes-loaded)
 - [Static Fields and Garbage Collection](https://www.baeldung.com/java-static-fields-gc)
-- [Difference Between Class.getResource() and ClassLoader.getResource()](https://www.baeldung.com/java-class-vs-classloader-getresource)
+- More articles: [[<-- prev]](/core-java-modules/core-java-jvm) [[next -->]](/core-java-modules/core-java-jvm-3)
-- More articles: [[<-- prev]](/core-java-modules/core-java-jvm)

core-java-modules/core-java-jvm-3/README.md

@@ -0,0 +1,8 @@
+## Core Java JVM Cookbooks and Examples
+
+This module contains articles about working with the Java Virtual Machine (JVM).
+
+### Relevant Articles: 
+
+- [Difference Between Class.getResource() and ClassLoader.getResource()](https://www.baeldung.com/java-class-vs-classloader-getresource)
+- More articles: [[<-- prev]](/core-java-modules/core-java-jvm-2)

core-java-modules/core-java-jvm-3/pom.xml

@@ -0,0 +1,21 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project xmlns="http://maven.apache.org/POM/4.0.0"
+    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+    xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
+    <modelVersion>4.0.0</modelVersion>
+    <artifactId>core-java-jvm-3</artifactId>
+    <version>0.1.0-SNAPSHOT</version>
+    <name>core-java-jvm-3</name>
+    <packaging>jar</packaging>
+
+    <parent>
+        <groupId>com.baeldung.core-java-modules</groupId>
+        <artifactId>core-java-modules</artifactId>
+        <version>0.0.1-SNAPSHOT</version>
+    </parent>
+
+    <dependencies>
+    
+    </dependencies>
+
+</project>

core-java-modules/core-java-lambdas/src/main/java/com/baeldung/anonymousclass/EmailSenderService.java

@@ -0,0 +1,10 @@
+package com.baeldung.anonymousclass;
+
+public class EmailSenderService implements SenderService {
+
+    @Override
+    public String callSender(Sender sender) {
+        return sender.send("Email Notification");
+    }
+
+}

core-java-modules/core-java-lambdas/src/main/java/com/baeldung/anonymousclass/Sender.java

@@ -0,0 +1,7 @@
+package com.baeldung.anonymousclass;
+
+public interface Sender {
+
+    String send(final String message);
+
+}

core-java-modules/core-java-lambdas/src/main/java/com/baeldung/anonymousclass/SenderService.java

@@ -0,0 +1,7 @@
+package com.baeldung.anonymousclass;
+
+public interface SenderService {
+
+    String callSender(Sender sender);
+
+}

core-java-modules/core-java-lambdas/src/main/java/com/baeldung/anonymousclass/SmsSenderService.java

@@ -0,0 +1,10 @@
+package com.baeldung.anonymousclass;
+
+public class SmsSenderService implements SenderService {
+
+    @Override
+    public String callSender(Sender sender) {
+        return sender.send("SMS Notification");
+    }
+
+}

core-java-modules/core-java-lambdas/src/test/java/com/baeldung/anonymousclass/AnonymousClassToLambdaIntegrationTest.java

@@ -0,0 +1,34 @@
+package com.baeldung.anonymousclass;
+
+import static org.junit.Assert.assertEquals;
+
+import org.junit.Test;
+
+public class AnonymousClassToLambdaIntegrationTest {
+
+    @Test
+    public void whenPassingAnonymousClass_thenSuccess() {
+        final SenderService emailSenderService = new EmailSenderService();
+
+        final String emailNotif = emailSenderService.callSender(new Sender() {
+            @Override
+            public String send(String message) {
+                return message;
+            }
+        });
+
+        assertEquals(emailNotif, "Email Notification");
+    }
+
+    @Test
+    public void whenPassingLambdaExpression_thenSuccess() {
+        final SenderService smsSenderService = new SmsSenderService();
+
+        final String smsNotif = smsSenderService.callSender((String message) -> {
+            return message;
+        });
+
+        assertEquals(smsNotif, "SMS Notification");
+    }
+
+}

core-java-modules/core-java-lang-5/src/main/java/com/baeldung/generics/Animal.java

@@ -0,0 +1,22 @@
+package com.baeldung.generics;
+
+abstract class Animal {
+
+    protected final String type;
+    protected final String name;
+
+    protected Animal(String type, String name) {
+        this.type = type;
+        this.name = name;
+    }
+
+    abstract String makeSound();
+
+    public String getType() {
+        return type;
+    }
+
+    public String getName() {
+        return name;
+    }
+}

core-java-modules/core-java-lang-5/src/main/java/com/baeldung/generics/AnimalDemo.java

@@ -0,0 +1,26 @@
+package com.baeldung.generics;
+
+import java.util.ArrayList;
+import java.util.List;
+
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+class AnimalDemo {
+
+    private static final Logger logger = LoggerFactory.getLogger(AnimalDemo.class);
+
+    public static void main(String[] args) {
+        List<Cat> cats = new ArrayList<>();
+        cats.add(new Cat("Persian", "Bono"));
+        cats.add(new Cat("Egyptian", "Lulu"));
+        cats.add(new Cat("Siamese", "Ra"));
+
+        order(cats);
+        logger.info("Ordered cats: {}", cats);
+    }
+
+    public static <T extends Animal & Comparable<T>> void order(List<T> list) {
+        list.sort(Comparable::compareTo);
+    }
+}

core-java-modules/core-java-lang-5/src/main/java/com/baeldung/generics/Cat.java

@@ -0,0 +1,41 @@
+package com.baeldung.generics;
+
+import java.util.Objects;
+
+class Cat extends Animal implements Comparable<Cat> {
+    public Cat(String type, String name) {
+        super(type, name);
+    }
+
+    @Override
+    public String makeSound() {
+        return "Meow";
+    }
+
+    /**
+     * Warning: Inconsistent with the equals method.
+     */
+    @Override
+    public int compareTo(Cat cat) {
+        return this.getName().length() - cat.getName().length();
+    }
+
+    @Override
+    public String toString() {
+        return "Cat{" + "type='" + type + '\'' + ", name='" + name + '\'' + '}';
+    }
+
+    @Override
+    public int hashCode() {
+        return Objects.hash(type, name);
+    }
+
+    @Override
+    public boolean equals(Object o) {
+        if(o == this) return true;
+        if(!(o instanceof Cat)) return false;
+        Cat cat = (Cat) o;
+        return type.equals(cat.type) && name.equals(cat.name);
+    }
+
+}

core-java-modules/core-java-lang-5/src/main/java/com/baeldung/generics/CollectionUtils.java

@@ -0,0 +1,56 @@
+package com.baeldung.generics;
+
+import java.util.List;
+import java.util.stream.Collectors;
+import java.util.stream.Stream;
+
+public class CollectionUtils {
+
+    private CollectionUtils() {
+    }
+
+    public static <T> void print(T item) {
+        System.out.println(item);
+    }
+
+    public static void swap(List<?> list, int src, int des) {
+        swapHelper(list, src, des);
+    }
+
+    private static <E> void swapHelper(List<E> list, int src, int des) {
+        list.set(src, list.set(des, list.get(src)));
+    }
+
+    public static <E> List<E> mergeTypeParameter(List<? extends E> listOne, List<? extends E> listTwo) {
+        return Stream.concat(listOne.stream(), listTwo.stream())
+            .collect(Collectors.toList());
+    }
+
+    public static <E> List<? extends E> mergeWildcard(List<? extends E> listOne, List<? extends E> listTwo) {
+        return Stream.concat(listOne.stream(), listTwo.stream())
+            .collect(Collectors.toList());
+    }
+
+    public static long sum(List<Number> numbers) {
+        return numbers.stream()
+            .mapToLong(Number::longValue)
+            .sum();
+    }
+
+    public static <T extends Number> long sumTypeParameter(List<T> numbers) {
+        return numbers.stream()
+            .mapToLong(Number::longValue)
+            .sum();
+    }
+
+    public static long sumWildcard(List<? extends Number> numbers) {
+        return numbers.stream()
+            .mapToLong(Number::longValue)
+            .sum();
+    }
+
+    public static void addNumber(List<? super Integer> list, Integer number) {
+        list.add(number);
+    }
+
+}

core-java-modules/core-java-lang-5/src/main/java/com/baeldung/generics/CollectionUtilsDemo.java

@@ -0,0 +1,48 @@
+package com.baeldung.generics;
+
+import java.util.ArrayList;
+import java.util.List;
+
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+class CollectionUtilsDemo {
+
+    private static final Logger logger = LoggerFactory.getLogger(CollectionUtilsDemo.class);
+
+    public static void main(String[] args) {
+        CollectionUtils.print("Baeldung");
+
+        List<Number> numbers1 = new ArrayList<>();
+        numbers1.add(5);
+        numbers1.add(10L);
+
+        List<Number> numbers2 = new ArrayList<>();
+        numbers2.add(15f);
+        numbers2.add(20.0);
+
+        List<Number> numbersMerged = CollectionUtils.mergeTypeParameter(numbers1, numbers2);
+        logger.info("Merged numbers: {}", numbersMerged);
+
+        List<Number> numbers = new ArrayList<>();
+        numbers.add(5);
+        numbers.add(10L);
+        numbers.add(15f);
+        numbers.add(20.0);
+
+        logger.info("Sum: {}", CollectionUtils.sum(numbers));
+        logger.info("Sum (wildcard): {}", CollectionUtils.sumWildcard(numbers));
+        logger.info("Sum (type parameter): {}", CollectionUtils.sumTypeParameter(numbers));
+
+        List<Integer> integers = new ArrayList<>();
+        integers.add(5);
+        logger.info("Sum integers (wildcard): {}", CollectionUtils.sumWildcard(integers));
+
+        CollectionUtils.addNumber(numbers, 4);
+        CollectionUtils.addNumber(integers, 5);
+
+        logger.info("Before swap: {}", numbers);
+        CollectionUtils.swap(numbers, 0, 1);
+        logger.info("After swap: {}", numbers);
+    }
+}

core-java-modules/core-java-lang-5/src/main/java/com/baeldung/generics/Dog.java

@@ -0,0 +1,14 @@
+package com.baeldung.generics;
+
+public class Dog extends Animal {
+
+    public Dog(String type, String name) {
+        super(type, name);
+    }
+
+    @Override
+    public String makeSound() {
+        return "Wuf";
+    }
+
+}

core-java-modules/core-java-lang-5/src/test/java/com/baeldung/convertinttochar/ConvertCharToIntUnitTest.java

@@ -0,0 +1,47 @@
+package com.baeldung.convertinttochar;
+
+import static org.junit.jupiter.api.Assertions.assertEquals;
+
+import org.junit.jupiter.api.Test;
+
+public class ConvertCharToIntUnitTest {
+
+    @Test
+    public void givenAChar_whenUsingGetNumericValue_thenExpectedNumericType() {
+        //char value
+        char c = '7';
+        // using getNumericValue
+        int n = Character.getNumericValue(c);
+
+        assertEquals(7, n);
+    }
+
+    @Test
+    public void givenAChar_whenSubtracting0_thenExpectedNumericType() {
+        //char value
+        char c = '7';
+        // subtract '0' from the char
+        int n = c - '0';
+
+        assertEquals(7, n);
+    }
+
+    @Test
+    public void givenAChar_whenUsingParseInt_thenExpectedNumericType() {
+        //char value
+        char c = '7';
+        // using parseInt
+        int n = Integer.parseInt(String.valueOf(c));
+
+        assertEquals(7, n);
+    }
+
+    @Test
+    public void givenAChar_whenCastingFromCharToInt_thenExpectedUnicodeRepresentation() {
+        //char value
+        char c = '7';
+        //cast to int
+        assertEquals(55, (int) c);
+    }
+
+}

core-java-modules/core-java-lang-5/src/test/java/com/baeldung/convertinttochar/ConvertIntToCharUnitTest.java

@@ -0,0 +1,36 @@
+package com.baeldung.convertinttochar;
+
+import static org.junit.jupiter.api.Assertions.assertEquals;
+
+import org.junit.jupiter.api.Test;
+
+public class ConvertIntToCharUnitTest {
+
+    @Test
+    public void givenAnInt_whenAdding0_thenExpectedCharType() {
+        int num = 7;
+        //add '0' to convert int to char
+        char c = (char) ('0' + num);
+
+        assertEquals('7', c);
+    }
+
+    @Test
+    public void givenAnInt_whenUsingForDigit_thenExpectedCharType() {
+        int num = 7;
+        // Convert using forDigit() method
+        char c = Character.forDigit(num, 10);
+
+        assertEquals('7', c);
+    }
+
+    @Test
+    public void givenAnInt_whenUsingToString_thenExpectedCharType() {
+        int num = 7;
+        //convert int to char using toString()
+        char c = Integer.toString(num)
+          .charAt(0);
+
+        assertEquals('7', c);
+    }
+}

core-java-modules/core-java-lang-math-3/src/main/java/com/baeldung/math/pascaltriangle/PascalTriangle.java

@@ -0,0 +1,48 @@
+package com.baeldung.math.pascaltriangle;
+
+public class PascalTriangle {
+
+    public static int factorial(int i) {
+        if (i == 0) {
+            return 1;
+        }
+        return i * factorial(i - 1);
+    }
+
+    private static void printUseRecursion(int n) {
+        for (int i = 0; i <= n; i++) {
+            for (int j = 0; j <= n - i; j++) {
+                System.out.print(" ");
+            }
+
+            for (int k = 0; k <= i; k++) {
+                System.out.print(" " + factorial(i) / (factorial(i - k) * factorial(k)));
+            }
+
+            System.out.println();
+        }
+    }
+
+public static void printUseBinomialExpansion(int n) {
+    for (int line = 1; line <= n; line++) {
+        for (int j = 0; j <= n - line; j++) {
+            System.out.print(" ");
+        }
+
+        int k = 1;
+        for (int i = 1; i <= line; i++) {
+            System.out.print(k + " ");
+            k = k * (line - i) / i;
+        }
+
+        System.out.println();
+    }
+}
+
+    public static void main(String[] args) {
+        int n = 5;
+        printUseRecursion(n);
+//        printUseBinomialExpansion(n);
+    }
+
+}

core-java-modules/pom.xml

@@ -73,6 +73,7 @@
         <module>core-java-jndi</module>
         <module>core-java-jvm</module>
         <module>core-java-jvm-2</module>
+        <module>core-java-jvm-3</module>
         <module>core-java-lambdas</module>
         <module>core-java-lang</module>
         <module>core-java-lang-2</module>

ddd-contexts/ddd-contexts-infrastructure/pom.xml

@@ -4,7 +4,7 @@
     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.dddcontexts.infrastructure</groupId>
-    <artifactId>infrastructure</artifactId>
+    <artifactId>ddd-contexts-infrastructure</artifactId>
     <version>1.0</version>
     <packaging>jar</packaging>
 
@@ -18,17 +18,17 @@
     <dependencies>
         <dependency>
             <groupId>com.baeldung.dddcontexts.shippingcontext</groupId>
-            <artifactId>shippingcontext</artifactId>
+            <artifactId>ddd-contexts-shippingcontext</artifactId>
             <version>${appmodules.version}</version>
         </dependency>
         <dependency>
             <groupId>com.baeldung.dddcontexts.ordercontext</groupId>
-            <artifactId>ordercontext</artifactId>
+            <artifactId>ddd-contexts-ordercontext</artifactId>
             <version>${appmodules.version}</version>
         </dependency>
         <dependency>
             <groupId>com.baeldung.dddcontexts.sharedkernel</groupId>
-            <artifactId>sharedkernel</artifactId>
+            <artifactId>ddd-contexts-sharedkernel</artifactId>
             <version>${appmodules.version}</version>
         </dependency>
     </dependencies>

ddd-contexts/ddd-contexts-mainapp/pom.xml

@@ -4,7 +4,7 @@
     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.dddcontexts.mainapp</groupId>
-    <artifactId>mainapp</artifactId>
+    <artifactId>ddd-contexts-mainapp</artifactId>
     <version>1.0</version>
     <packaging>jar</packaging>
 
@@ -18,7 +18,7 @@
     <dependencies>
         <dependency>
             <groupId>com.baeldung.dddcontexts.infrastructure</groupId>
-            <artifactId>infrastructure</artifactId>
+            <artifactId>ddd-contexts-infrastructure</artifactId>
             <version>${appmodules.version}</version>
         </dependency>
     </dependencies>

ddd-contexts/ddd-contexts-ordercontext/pom.xml

@@ -4,7 +4,7 @@
     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.dddcontexts.ordercontext</groupId>
-    <artifactId>ordercontext</artifactId>
+    <artifactId>ddd-contexts-ordercontext</artifactId>
     <version>1.0</version>
     <packaging>jar</packaging>
 
@@ -17,7 +17,7 @@
     <dependencies>
         <dependency>
             <groupId>com.baeldung.dddcontexts.sharedkernel</groupId>
-            <artifactId>sharedkernel</artifactId>
+            <artifactId>ddd-contexts-sharedkernel</artifactId>
             <version>${appmodules.version}</version>
         </dependency>
     </dependencies>

ddd-contexts/ddd-contexts-sharedkernel/pom.xml

@@ -4,7 +4,7 @@
     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.dddcontexts.sharedkernel</groupId>
-    <artifactId>sharedkernel</artifactId>
+    <artifactId>ddd-contexts-sharedkernel</artifactId>
     <version>1.0</version>
     <packaging>jar</packaging>
 

ddd-contexts/ddd-contexts-shippingcontext/pom.xml

@@ -4,7 +4,7 @@
     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.dddcontexts.shippingcontext</groupId>
-    <artifactId>shippingcontext</artifactId>
+    <artifactId>ddd-contexts-shippingcontext</artifactId>
     <version>1.0</version>
     <packaging>jar</packaging>
 
@@ -17,7 +17,7 @@
     <dependencies>
         <dependency>
             <groupId>com.baeldung.dddcontexts.sharedkernel</groupId>
-            <artifactId>sharedkernel</artifactId>
+            <artifactId>ddd-contexts-sharedkernel</artifactId>
             <version>${appmodules.version}</version>
         </dependency>
     </dependencies>

ddd-contexts/pom.xml

@@ -16,11 +16,11 @@
     </parent>
 
     <modules>
-        <module>sharedkernel</module>
+        <module>ddd-contexts-sharedkernel</module>
-        <module>infrastructure</module>
+        <module>ddd-contexts-infrastructure</module>
-        <module>shippingcontext</module>
+        <module>ddd-contexts-shippingcontext</module>
-        <module>ordercontext</module>
+        <module>ddd-contexts-ordercontext</module>
-        <module>mainapp</module>
+        <module>ddd-contexts-mainapp</module>
     </modules>
 
     <dependencyManagement>

di-modules/cdi/pom.xml

@@ -10,7 +10,7 @@
         <groupId>com.baeldung</groupId>
         <artifactId>parent-spring-5</artifactId>
         <version>0.0.1-SNAPSHOT</version>
-        <relativePath>../parent-spring-5</relativePath>
+        <relativePath>../../parent-spring-5</relativePath>
     </parent>
 
     <dependencies>

httpclient-simple/src/main/java/com/baeldung/handler/CustomHttpClientResponseHandler.java

@@ -0,0 +1,11 @@
+package com.baeldung.handler;
+
+import org.apache.hc.core5.http.ClassicHttpResponse;
+import org.apache.hc.core5.http.io.HttpClientResponseHandler;
+
+public class CustomHttpClientResponseHandler implements HttpClientResponseHandler<ClassicHttpResponse> {
+    @Override
+    public ClassicHttpResponse handleResponse(ClassicHttpResponse response) {
+        return response;
+    }
+}

httpclient-simple/src/test/java/com/baeldung/httpclient/sec/HttpClientCookieLiveTest.java

@@ -1,114 +1,87 @@
 package com.baeldung.httpclient.sec;
 
-import org.apache.http.client.methods.CloseableHttpResponse;
+import com.baeldung.handler.CustomHttpClientResponseHandler;
-import org.apache.http.client.methods.HttpGet;
-import org.apache.http.client.protocol.HttpClientContext;
-import org.apache.http.cookie.ClientCookie;
-import org.apache.http.impl.client.BasicCookieStore;
-import org.apache.http.impl.client.CloseableHttpClient;
-import org.apache.http.impl.client.DefaultHttpClient;
-import org.apache.http.impl.client.HttpClientBuilder;
-import org.apache.http.impl.cookie.BasicClientCookie;
-import org.apache.http.protocol.BasicHttpContext;
-import org.apache.http.protocol.HttpContext;
-import com.baeldung.httpclient.ResponseUtil;
 
-import org.junit.After;
+import org.apache.hc.client5.http.classic.methods.HttpGet;
-import org.junit.Before;
+import org.apache.hc.client5.http.cookie.BasicCookieStore;
-import org.junit.Test;
+import org.apache.hc.client5.http.impl.classic.CloseableHttpClient;
-import org.slf4j.Logger;
+import org.apache.hc.client5.http.impl.classic.CloseableHttpResponse;
-import org.slf4j.LoggerFactory;
+import org.apache.hc.client5.http.impl.classic.HttpClientBuilder;
+import org.apache.hc.client5.http.impl.classic.HttpClients;
+import org.apache.hc.client5.http.impl.cookie.BasicClientCookie;
+import org.apache.hc.client5.http.protocol.HttpClientContext;
+
+import org.apache.hc.core5.http.protocol.BasicHttpContext;
+import org.apache.hc.core5.http.protocol.HttpContext;
+import org.junit.jupiter.api.Test;
 
 import java.io.IOException;
 
+import static org.hamcrest.MatcherAssert.assertThat;
 import static org.hamcrest.Matchers.equalTo;
-import static org.junit.Assert.assertThat;
 
-public class HttpClientCookieLiveTest {
+class HttpClientCookieLiveTest {
-
-    private CloseableHttpClient instance;
-
-    private CloseableHttpResponse response;
-    
-    private static Logger log = LoggerFactory.getLogger(HttpClientCookieLiveTest.class);
-
-    @Before
-    public final void before() {
-        instance = HttpClientBuilder.create().build();
-    }
-
-    @After
-    public final void after() throws IllegalStateException, IOException {
-        ResponseUtil.closeResponse(response);
-    }
-
-    // tests
 
     @Test
-    public final void whenSettingCookiesOnARequest_thenCorrect() throws IOException {
+    final void whenSettingCookiesOnARequest_thenCorrect() throws IOException {
-        instance = HttpClientBuilder.create().build();
         final HttpGet request = new HttpGet("http://www.github.com");
         request.setHeader("Cookie", "JSESSIONID=1234");
-
+        try (CloseableHttpClient client = HttpClients.createDefault(); CloseableHttpResponse response = (CloseableHttpResponse) client.execute(request, new CustomHttpClientResponseHandler());) {
-        response = instance.execute(request);
+            assertThat(response.getCode(), equalTo(200));
-
+        }
-        assertThat(response.getStatusLine().getStatusCode(), equalTo(200));
     }
 
     @Test
-    public final void givenUsingDeprecatedApi_whenSettingCookiesOnTheHttpClient_thenCorrect() throws IOException {
+    final void givenUsingDeprecatedApi_whenSettingCookiesOnTheHttpClient_thenCorrect() throws IOException {
         final BasicCookieStore cookieStore = new BasicCookieStore();
         final BasicClientCookie cookie = new BasicClientCookie("JSESSIONID", "1234");
         cookie.setDomain(".github.com");
-        cookie.setAttribute(ClientCookie.DOMAIN_ATTR, "true");
+        cookie.setAttribute("domain", "true");
-
         cookie.setPath("/");
         cookieStore.addCookie(cookie);
-        
-        DefaultHttpClient client = new DefaultHttpClient();
-        client.setCookieStore(cookieStore);
-        
         final HttpGet request = new HttpGet("https://www.github.com");
+        try (CloseableHttpClient client = HttpClientBuilder.create()
+            .setDefaultCookieStore(cookieStore)
+            .build(); CloseableHttpResponse response = (CloseableHttpResponse) client.execute(request, new CustomHttpClientResponseHandler())) {
 
-        response = (CloseableHttpResponse) client.execute(request);
+            assertThat(response.getCode(), equalTo(200));
-
+        }
-        assertThat(response.getStatusLine().getStatusCode(), equalTo(200));
     }
 
     @Test
-    public final void whenSettingCookiesOnTheHttpClient_thenCookieSentCorrectly() throws IOException {
+    final void whenSettingCookiesOnTheHttpClient_thenCookieSentCorrectly() throws IOException {
         final BasicCookieStore cookieStore = new BasicCookieStore();
         final BasicClientCookie cookie = new BasicClientCookie("JSESSIONID", "1234");
         cookie.setDomain(".github.com");
-        cookie.setAttribute(ClientCookie.DOMAIN_ATTR, "true");
+        cookie.setAttribute("domain", "true");
         cookie.setPath("/");
         cookieStore.addCookie(cookie);
-        instance = HttpClientBuilder.create().setDefaultCookieStore(cookieStore).build();
-
         final HttpGet request = new HttpGet("http://www.github.com");
 
-        response = instance.execute(request);
+        try (CloseableHttpClient client = HttpClientBuilder.create().setDefaultCookieStore(cookieStore).build();
+            CloseableHttpResponse response = (CloseableHttpResponse) client.execute(request, new CustomHttpClientResponseHandler())) {
+
+            assertThat(response.getCode(), equalTo(200));
+        }
 
-        assertThat(response.getStatusLine().getStatusCode(), equalTo(200));
     }
 
     @Test
-    public final void whenSettingCookiesOnTheRequest_thenCookieSentCorrectly() throws IOException {
+    final void whenSettingCookiesOnTheRequest_thenCookieSentCorrectly() throws IOException {
         final BasicCookieStore cookieStore = new BasicCookieStore();
         final BasicClientCookie cookie = new BasicClientCookie("JSESSIONID", "1234");
         cookie.setDomain(".github.com");
         cookie.setPath("/");
         cookieStore.addCookie(cookie);
-        instance = HttpClientBuilder.create().build();
-
         final HttpGet request = new HttpGet("http://www.github.com");
-
         final HttpContext localContext = new BasicHttpContext();
         localContext.setAttribute(HttpClientContext.COOKIE_STORE, cookieStore);
         // localContext.setAttribute(ClientContext.COOKIE_STORE, cookieStore); // before 4.3
-        response = instance.execute(request, localContext);
 
-        assertThat(response.getStatusLine().getStatusCode(), equalTo(200));
+        try (CloseableHttpClient client = HttpClientBuilder.create().build();
+            CloseableHttpResponse response = (CloseableHttpResponse) client.execute(request, localContext, new CustomHttpClientResponseHandler())) {
+            assertThat(response.getCode(), equalTo(200));
+        }
     }
 
 }

json-modules/json-2/pom.xml

@@ -108,6 +108,17 @@
                 </exclusion>
             </exclusions>
         </dependency>
+        <dependency>
+            <groupId>commons-io</groupId>
+            <artifactId>commons-io</artifactId>
+            <version>2.11.0</version>
+        </dependency>
+        <dependency>
+            <groupId>org.junit.jupiter</groupId>
+            <artifactId>junit-jupiter</artifactId>
+            <version>RELEASE</version>
+            <scope>test</scope>
+        </dependency>
     </dependencies>
 
     <build>

json-modules/json-2/src/main/java/com/baeldung/jsonvaluegetter/JSONObjectValueGetter.java

@@ -0,0 +1,87 @@
+package com.baeldung.jsonvaluegetter;
+
+import org.json.JSONArray;
+import org.json.JSONObject;
+
+import java.util.ArrayList;
+import java.util.List;
+
+public class JSONObjectValueGetter {
+
+    /**
+     * Get values associated with the provided key in the given JSONObject instance
+     *
+     * @param jsonObject JSONObject instance in which to search the key
+     * @param key        Key we're interested in
+     *
+     * @return List of values associated with the given key, in the order of appearance.
+     *         If the key is absent, empty list is returned.
+     */
+    public List<String> getValuesInObject(JSONObject jsonObject, String key) {
+        List<String> accumulatedValues = new ArrayList<>();
+        for (String currentKey : jsonObject.keySet()) {
+            Object value = jsonObject.get(currentKey);
+            if (currentKey.equals(key)) {
+                accumulatedValues.add(value.toString());
+            }
+
+            if (value instanceof JSONObject) {
+                accumulatedValues.addAll(getValuesInObject((JSONObject)value, key));
+            } else if (value instanceof JSONArray) {
+                accumulatedValues.addAll(getValuesInArray((JSONArray)value, key));
+            }
+        }
+
+        return accumulatedValues;
+    }
+
+    /**
+     * Get values associated with the provided key in the given JSONArray instance
+     *
+     * @param jsonArray JSONArray instance in which to search the key
+     * @param key       Key we're interested in
+     *
+     * @return List of values associated with the given key, in the order of appearance.
+     *         If the key is absent, empty list is returned.
+     */
+    public List<String> getValuesInArray(JSONArray jsonArray, String key) {
+        List<String> accumulatedValues = new ArrayList<>();
+        for (Object obj : jsonArray) {
+            if (obj instanceof JSONArray) {
+                accumulatedValues.addAll(getValuesInArray((JSONArray)obj, key));
+            } else if (obj instanceof JSONObject) {
+                accumulatedValues.addAll(getValuesInObject((JSONObject)obj, key));
+            }
+        }
+
+        return accumulatedValues;
+    }
+
+    /**
+     * Among all the values associated with the given key, get the N-th value
+     *
+     * @param jsonObject JSONObject instance in which to search the key
+     * @param key        Key we're interested in
+     * @param N          Index of the value to get
+     *
+     * @return N-th value associated with the key, or null if the key is absent or
+     *         the number of values associated with the key is less than N
+     */
+    public String getNthValue(JSONObject jsonObject, String key, int N) {
+        List<String> values = getValuesInObject(jsonObject, key);
+        return (values.size() >= N) ? values.get(N - 1) : null;
+    }
+
+    /**
+     * Count the number of values associated with the given key
+     *
+     * @param jsonObject JSONObject instance in which to count the key
+     * @param key        Key we're interested in
+     *
+     * @return The number of values associated with the given key
+     */
+    public int getCount(JSONObject jsonObject, String key) {
+        List<String> values = getValuesInObject(jsonObject, key);
+        return values.size();
+    }
+}

json-modules/json-2/src/test/java/com/baeldung/jsonvaluegetter/JSONObjectValueGetterUnitTest.java

@@ -0,0 +1,69 @@
+package com.baeldung.jsonvaluegetter;
+
+import org.apache.commons.io.IOUtils;
+import org.json.JSONArray;
+import org.json.JSONException;
+import org.json.JSONObject;
+import org.junit.jupiter.api.Assertions;
+import org.junit.jupiter.api.BeforeAll;
+import org.junit.jupiter.api.Test;
+
+import java.io.IOException;
+import java.io.InputStream;
+import java.util.List;
+
+public class JSONObjectValueGetterUnitTest {
+
+    private static JSONObject jsonObject;
+    private static JSONObjectValueGetter jsonObjectValueGetter = new JSONObjectValueGetter();
+
+    @BeforeAll
+    public static void loadJsonContent() throws IOException {
+        InputStream inputStream = JSONObjectValueGetterUnitTest.class.getClassLoader().getResourceAsStream("employee.json");
+        String jsonString = IOUtils.toString(inputStream, "UTF-8");
+        jsonObject = new JSONObject(jsonString);
+    }
+
+    @Test
+    public void getValueDirectly() {
+        JSONArray family = jsonObject.getJSONArray("family");
+        JSONObject sonObject = family.getJSONObject(1);
+        JSONObject sonData = sonObject.getJSONObject("son");
+        String sonName = sonData.getString("name");
+        Assertions.assertEquals(sonName, "Peter");
+    }
+
+    @Test
+    public void getAllAssociatedValuesRecursively() {
+        List<String> values = jsonObjectValueGetter.getValuesInObject(jsonObject, "son");
+        Assertions.assertEquals(values.size(), 1);
+
+        String sonString = values.get(0);
+        Assertions.assertTrue(sonString.contains("Peter"));
+        Assertions.assertTrue(sonString.contains("Schoolboy"));
+        Assertions.assertTrue(sonString.contains("11"));
+
+        values = jsonObjectValueGetter.getValuesInObject(jsonObject, "name");
+        Assertions.assertEquals(values.size(), 3);
+
+        Assertions.assertEquals(values.get(0), "Bob");
+        Assertions.assertEquals(values.get(1), "Alice");
+        Assertions.assertEquals(values.get(2), "Peter");
+    }
+
+    @Test
+    public void getNthValueRecursively() {
+        Assertions.assertEquals(jsonObjectValueGetter.getNthValue(jsonObject, "name", 1), "Bob");
+        Assertions.assertEquals(jsonObjectValueGetter.getNthValue(jsonObject, "name", 2), "Alice");
+        Assertions.assertEquals(jsonObjectValueGetter.getNthValue(jsonObject, "name", 3), "Peter");
+        Assertions.assertNull(jsonObjectValueGetter.getNthValue(jsonObject, "nonExistingKey", 1));
+    }
+
+    @Test
+    public void getCountRecursively() {
+        Assertions.assertEquals(jsonObjectValueGetter.getCount(jsonObject, "name"), 3);
+        Assertions.assertEquals(jsonObjectValueGetter.getCount(jsonObject, "age"), 3);
+        Assertions.assertEquals(jsonObjectValueGetter.getCount(jsonObject, "occupation"), 1);
+        Assertions.assertEquals(jsonObjectValueGetter.getCount(jsonObject, "nonExistingKey"), 0);
+    }
+}

json-modules/json-2/src/test/resources/employee.json

@@ -0,0 +1,30 @@
+{
+  "name" : "Bob",
+  "profession" : "Software engineer",
+  "department" : "Research",
+  "age" : 40,
+  "family" : [
+    {
+      "wife" : {
+        "name" : "Alice",
+        "profession" : "Doctor",
+        "age" : 38
+      }
+    },
+    {
+      "son" : {
+        "name" : "Peter",
+        "occupation" : "Schoolboy",
+        "age" : 11
+      }
+    }
+  ],
+  "performance" : [
+    {
+      "2020" : 4.5
+    },
+    {
+      "2021" : 4.8
+    }
+  ]
+}

maven-modules/multimodulemavenproject/maven-daomodule/pom.xml

@@ -4,7 +4,7 @@
     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.daomodule</groupId>
-    <artifactId>daomodule</artifactId>
+    <artifactId>maven-daomodule</artifactId>
     <version>1.0</version>
     <packaging>jar</packaging>
 

maven-modules/multimodulemavenproject/maven-entitymodule/pom.xml

@@ -4,7 +4,7 @@
     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.entitymodule</groupId>
-    <artifactId>entitymodule</artifactId>
+    <artifactId>maven-entitymodule</artifactId>
     <version>1.0</version>
     <packaging>jar</packaging>
 

maven-modules/multimodulemavenproject/maven-mainappmodule/pom.xml

@@ -4,7 +4,7 @@
     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.mainappmodule</groupId>
-    <artifactId>mainappmodule</artifactId>
+    <artifactId>maven-mainappmodule</artifactId>
     <version>1.0</version>
     <packaging>jar</packaging>
 
@@ -17,17 +17,17 @@
     <dependencies>
         <dependency>
             <groupId>com.baeldung.entitymodule</groupId>
-            <artifactId>entitymodule</artifactId>
+            <artifactId>maven-entitymodule</artifactId>
             <version>${entitymodule.version}</version>
         </dependency>
         <dependency>
             <groupId>com.baeldung.daomodule</groupId>
-            <artifactId>daomodule</artifactId>
+            <artifactId>maven-daomodule</artifactId>
             <version>${daomodule.version}</version>
         </dependency>
         <dependency>
             <groupId>com.baeldung.userdaomodule</groupId>
-            <artifactId>userdaomodule</artifactId>
+            <artifactId>maven-userdaomodule</artifactId>
             <version>${userdaomodule.version}</version>
         </dependency>
     </dependencies>

maven-modules/multimodulemavenproject/maven-userdaomodule/pom.xml

@@ -4,7 +4,7 @@
     xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
     <modelVersion>4.0.0</modelVersion>
     <groupId>com.baeldung.userdaomodule</groupId>
-    <artifactId>userdaomodule</artifactId>
+    <artifactId>maven-userdaomodule</artifactId>
     <version>1.0</version>
     <packaging>jar</packaging>
 

maven-modules/multimodulemavenproject/pom.xml

@@ -17,10 +17,10 @@
     </parent>
 
     <modules>
-        <module>entitymodule</module>
+        <module>maven-entitymodule</module>
-        <module>daomodule</module>
+        <module>maven-daomodule</module>
-        <module>userdaomodule</module>
+        <module>maven-userdaomodule</module>
-        <module>mainappmodule</module>
+        <module>maven-mainappmodule</module>
     </modules>
 
     <build>

maven-modules/version-collision/pom.xml

@@ -13,8 +13,8 @@
     </parent>
 
     <modules>
-        <module>project-a</module>
+        <module>version-collision-project-a</module>
-        <module>project-b</module>
+        <module>version-collision-project-b</module>
         <module>project-collision</module>
     </modules>
 

maven-modules/version-collision/project-collision/pom.xml

@@ -14,7 +14,7 @@
     <dependencies>
         <dependency>
             <groupId>com.baeldung</groupId>
-            <artifactId>project-a</artifactId>
+            <artifactId>version-collision-project-a</artifactId>
             <version>0.0.1-SNAPSHOT</version>
             <!-- uncomment to exclude guava transitive artifact from module -->
             <!-- <exclusions> -->
@@ -26,7 +26,7 @@
         </dependency>
         <dependency>
             <groupId>com.baeldung</groupId>
-            <artifactId>project-b</artifactId>
+            <artifactId>version-collision-project-b</artifactId>
             <version>0.0.1-SNAPSHOT</version>
         </dependency>
     </dependencies>

maven-modules/version-collision/version-collision-project-a/pom.xml

@@ -3,7 +3,7 @@
     xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
     xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
     <modelVersion>4.0.0</modelVersion>
-    <artifactId>project-a</artifactId>
+    <artifactId>version-collision-project-a</artifactId>
 
     <parent>
         <artifactId>version-collision</artifactId>

maven-modules/version-collision/version-collision-project-b/pom.xml

@@ -3,7 +3,7 @@
     xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
     xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
     <modelVersion>4.0.0</modelVersion>
-    <artifactId>project-b</artifactId>
+    <artifactId>version-collision-project-b</artifactId>
 
     <parent>
         <artifactId>version-collision</artifactId>

maven-modules/version-overriding-plugins/pom.xml

@@ -13,8 +13,8 @@
     </parent>
 
     <modules>
-        <module>child-a</module>
+        <module>version-overriding-child-a</module>
-        <module>child-b</module>
+        <module>version-overriding-child-b</module>
     </modules>
 
     <build>

maven-modules/version-overriding-plugins/version-overriding-child-a/pom.xml

@@ -3,7 +3,7 @@
     xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
     xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
     <modelVersion>4.0.0</modelVersion>
-    <artifactId>child-a</artifactId>
+    <artifactId>version-overriding-child-a</artifactId>
     <packaging>pom</packaging>
 
     <parent>

maven-modules/version-overriding-plugins/version-overriding-child-b/pom.xml

@@ -3,7 +3,7 @@
     xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
     xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
     <modelVersion>4.0.0</modelVersion>
-    <artifactId>child-b</artifactId>
+    <artifactId>version-overriding-child-b</artifactId>
 
     <parent>
         <artifactId>version-overriding-plugins</artifactId>

parent-spring-5/pom.xml

@@ -24,7 +24,7 @@
     </dependencies>
 
     <properties>
-        <spring.version>5.3.23</spring.version>
+        <spring.version>5.3.24</spring.version>
         <spring-security.version>5.7.3</spring-security.version>
         <spring-boot-starter-test.version>1.5.10.RELEASE</spring-boot-starter-test.version>
     </properties>

persistence-modules/blaze-persistence/README.md

@@ -0,0 +1 @@
+### Relevant Articles:

persistence-modules/blaze-persistence/pom.xml

@@ -0,0 +1,121 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project xmlns="http://maven.apache.org/POM/4.0.0"
+         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
+    <modelVersion>4.0.0</modelVersion>
+    <artifactId>blaze-persistence</artifactId>
+    <version>1.0-SNAPSHOT</version>
+    <name>blaze-persistence</name>
+
+    <parent>
+        <groupId>org.springframework.boot</groupId>
+        <artifactId>spring-boot-starter-parent</artifactId>
+        <version>2.4.0</version>
+        <relativePath/>
+    </parent>
+
+    <properties>
+        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
+        <maven.compiler.source>1.8</maven.compiler.source>
+        <maven.compiler.target>1.8</maven.compiler.target>
+        <blaze-persistence.version>1.6.8</blaze-persistence.version>
+    </properties>
+
+    <dependencyManagement>
+        <dependencies>
+            <dependency>
+                <groupId>com.blazebit</groupId>
+                <artifactId>blaze-persistence-bom</artifactId>
+                <version>${blaze-persistence.version}</version>
+                <type>pom</type>
+                <scope>import</scope>
+            </dependency>
+        </dependencies>
+    </dependencyManagement>
+
+    <dependencies>
+        <dependency>
+            <groupId>org.springframework.boot</groupId>
+            <artifactId>spring-boot-starter-data-jpa</artifactId>
+        </dependency>
+
+        <!-- Core dependencies -->
+        <dependency>
+            <groupId>com.blazebit</groupId>
+            <artifactId>blaze-persistence-core-api</artifactId>
+        </dependency>
+        <dependency>
+            <groupId>com.blazebit</groupId>
+            <artifactId>blaze-persistence-core-impl</artifactId>
+        </dependency>
+        <dependency>
+            <groupId>com.blazebit</groupId>
+            <artifactId>blaze-persistence-integration-hibernate-5.4</artifactId>
+        </dependency>
+
+        <!-- Entity View dependencies -->
+        <dependency>
+            <groupId>com.blazebit</groupId>
+            <artifactId>blaze-persistence-entity-view-api</artifactId>
+        </dependency>
+        <dependency>
+            <groupId>com.blazebit</groupId>
+            <artifactId>blaze-persistence-entity-view-impl</artifactId>
+        </dependency>
+        <dependency>
+            <groupId>com.blazebit</groupId>
+            <artifactId>blaze-persistence-entity-view-processor</artifactId>
+        </dependency>
+
+        <!-- Spring integration dependencies -->
+        <dependency>
+            <groupId>com.blazebit</groupId>
+            <artifactId>blaze-persistence-integration-entity-view-spring</artifactId>
+        </dependency>
+        <dependency>
+            <groupId>com.blazebit</groupId>
+            <artifactId>blaze-persistence-integration-spring-data-2.4</artifactId>
+        </dependency>
+
+        <!-- Spring dependencies -->
+        <dependency>
+            <groupId>org.springframework</groupId>
+            <artifactId>spring-context</artifactId>
+        </dependency>
+        <dependency>
+            <groupId>org.springframework</groupId>
+            <artifactId>spring-orm</artifactId>
+        </dependency>
+
+        <dependency>
+            <groupId>com.h2database</groupId>
+            <artifactId>h2</artifactId>
+        </dependency>
+
+        <!-- Test dependencies -->
+        <dependency>
+            <groupId>org.springframework</groupId>
+            <artifactId>spring-test</artifactId>
+            <scope>test</scope>
+        </dependency>
+        <dependency>
+            <groupId>org.junit.jupiter</groupId>
+            <artifactId>junit-jupiter-engine</artifactId>
+            <scope>test</scope>
+        </dependency>
+        <dependency>
+            <groupId>org.junit.jupiter</groupId>
+            <artifactId>junit-jupiter-api</artifactId>
+            <scope>test</scope>
+        </dependency>
+    </dependencies>
+
+    <build>
+        <plugins>
+            <plugin>
+                <groupId>org.springframework.boot</groupId>
+                <artifactId>spring-boot-maven-plugin</artifactId>
+            </plugin>
+        </plugins>
+    </build>
+</project>

persistence-modules/blaze-persistence/src/main/java/com/baeldung/BlazePersistenceApplication.java

@@ -0,0 +1,57 @@
+package com.baeldung;
+
+import com.baeldung.model.Person;
+import com.baeldung.model.Post;
+import com.baeldung.repository.PersonRepository;
+import com.baeldung.repository.PostRepository;
+import com.baeldung.repository.PostViewRepository;
+import com.baeldung.view.PostWithAuthorView;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.boot.CommandLineRunner;
+import org.springframework.boot.SpringApplication;
+import org.springframework.boot.autoconfigure.SpringBootApplication;
+
+@SpringBootApplication
+public class BlazePersistenceApplication implements CommandLineRunner {
+
+    private static final Logger logger = LoggerFactory.getLogger(BlazePersistenceApplication.class);
+
+    @Autowired
+    private PersonRepository personRepository;
+
+    @Autowired
+    private PostRepository postRepository;
+
+    @Autowired
+    private PostViewRepository postViewRepository;
+
+    public static void main(String[] args) {
+        SpringApplication.run(BlazePersistenceApplication.class, args);
+    }
+
+    @Override
+    public void run(String... args) {
+
+        logger.info("All Posts:");
+        Iterable<Post> posts = postRepository.findAll();
+        posts.forEach(p -> logger.info(String.valueOf(p)));
+
+        logger.info("Posts with title 'Spring' or author 'Peter':");
+        Iterable<PostWithAuthorView> postsFiltered = postRepository.findBy("Spring", "Peter");
+        postsFiltered.forEach(p -> logger.info(String.valueOf(p)));
+
+        logger.info("Find all post with author view:");
+        Iterable<PostWithAuthorView> postsView = postViewRepository.findAll();
+        postsView.forEach(p -> logger.info(String.valueOf(p)));
+
+        logger.info("Person with at least two posts:");
+        Iterable<Person> personIterable = personRepository.find();
+        personIterable.forEach(p -> logger.info(String.valueOf(p)));
+
+        logger.info("All Persons:");
+        Iterable<Person> personIterableAll = personRepository.findAll();
+        personIterableAll.forEach(p -> logger.info(String.valueOf(p)));
+    }
+}

persistence-modules/blaze-persistence/src/main/java/com/baeldung/config/BlazePersistenceConfiguration.java

@@ -0,0 +1,35 @@
+package com.baeldung.config;
+
+import com.blazebit.persistence.Criteria;
+import com.blazebit.persistence.CriteriaBuilderFactory;
+import com.blazebit.persistence.integration.view.spring.EnableEntityViews;
+import com.blazebit.persistence.spi.CriteriaBuilderConfiguration;
+import com.blazebit.persistence.spring.data.repository.config.EnableBlazeRepositories;
+import com.blazebit.persistence.view.EntityViewManager;
+import com.blazebit.persistence.view.spi.EntityViewConfiguration;
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.context.annotation.Bean;
+import org.springframework.context.annotation.Configuration;
+
+import javax.persistence.EntityManagerFactory;
+
+@Configuration
+@EnableEntityViews(basePackages = {"com.baeldung.view"})
+@EnableBlazeRepositories(basePackages = "com.baeldung.repository")
+public class BlazePersistenceConfiguration {
+
+    @Autowired
+    private EntityManagerFactory entityManagerFactory;
+
+    @Bean
+    public CriteriaBuilderFactory createCriteriaBuilderFactory() {
+        CriteriaBuilderConfiguration config = Criteria.getDefault();
+        return config.createCriteriaBuilderFactory(entityManagerFactory);
+    }
+
+    @Bean
+    public EntityViewManager createEntityViewManager(CriteriaBuilderFactory criteriaBuilderFactory,
+                                                     EntityViewConfiguration entityViewConfiguration) {
+        return entityViewConfiguration.createEntityViewManager(criteriaBuilderFactory);
+    }
+}