Merge branch 'master' into SpringReactiveKotlin

.travis.yml

@@ -4,7 +4,7 @@ before_install:
   - echo "MAVEN_OPTS='-Xmx2048M -Xss128M -XX:+CMSClassUnloadingEnabled -XX:+UseG1GC -XX:-UseGCOverheadLimit'" > ~/.mavenrc
 
 install: skip
-script: travis_wait 60 mvn -q install
+script: travis_wait 60 mvn -q install -Pdefault
 
 sudo: required
 

algorithms/README.md

@@ -5,7 +5,6 @@
 - [Ant Colony Optimization](http://www.baeldung.com/java-ant-colony-optimization)
 - [Validating Input With Finite Automata in Java](http://www.baeldung.com/java-finite-automata)
 - [Introduction to Jenetics Library](http://www.baeldung.com/jenetics)
-- [Check If a Number Is Prime in Java](http://www.baeldung.com/java-prime-numbers)
 - [Example of Hill Climbing Algorithm](http://www.baeldung.com/java-hill-climbing-algorithm)
 - [Monte Carlo Tree Search for Tic-Tac-Toe Game](http://www.baeldung.com/java-monte-carlo-tree-search)
 - [String Search Algorithms for Large Texts](http://www.baeldung.com/java-full-text-search-algorithms)
@@ -21,7 +20,6 @@
 - [Create a Sudoku Solver in Java](http://www.baeldung.com/java-sudoku)
 - [Displaying Money Amounts in Words](http://www.baeldung.com/java-money-into-words)
 - [A Collaborative Filtering Recommendation System in Java](http://www.baeldung.com/java-collaborative-filtering-recommendations)
-- [Find All Pairs of Numbers in an Array That Add Up to a Given Sum](http://www.baeldung.com/java-algorithm-number-pairs-sum)
 - [Converting Between Roman and Arabic Numerals in Java](http://www.baeldung.com/java-convert-roman-arabic)
 - [Practical Java Examples of the Big O Notation](http://www.baeldung.com/java-algorithm-complexity)
 - [Find the Middle Element of a Linked List](http://www.baeldung.com/java-linked-list-middle-element)

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

@@ -6,7 +6,6 @@ import com.baeldung.algorithms.ga.annealing.SimulatedAnnealing;
 import com.baeldung.algorithms.ga.ant_colony.AntColonyOptimization;
 import com.baeldung.algorithms.ga.binary.SimpleGeneticAlgorithm;
 import com.baeldung.algorithms.slope_one.SlopeOne;
-import com.baeldung.algorithms.pairsaddupnumber.FindPairs;
 
 public class RunAlgorithm {
 
@@ -39,12 +38,6 @@ public class RunAlgorithm {
 		case 5:
 			System.out.println("Please run the DijkstraAlgorithmTest.");
 			break;
-		case 6:
-			final FindPairs findPairs = new FindPairs();
-			final int[] input = {1, 4, 3, 2, 1, 4, 4, 3, 3};
-			final int sum = 6;
-			findPairs.execute(input, sum);
-			break;
 		default:
 			System.out.println("Unknown option");
 			break;

algorithms/src/main/java/com/baeldung/algorithms/prime/PrimeGenerator.java

@@ -1,59 +0,0 @@
-package com.baeldung.algorithms.prime;
-
-import java.util.Arrays;
-import java.util.LinkedList;
-import java.util.List;
-import java.util.stream.Collectors;
-import java.util.stream.IntStream;
-
-public class PrimeGenerator {
-    public static List<Integer> sieveOfEratosthenes(int n) {
-        final boolean prime[] = new boolean[n + 1];
-        Arrays.fill(prime, true);
-
-        for (int p = 2; p * p <= n; p++) {
-            if (prime[p]) {
-                for (int i = p * 2; i <= n; i += p)
-                    prime[i] = false;
-            }
-        }
-
-        final List<Integer> primes = new LinkedList<>();
-        for (int i = 2; i <= n; i++) {
-            if (prime[i])
-                primes.add(i);
-        }
-        return primes;
-    }
-
-    public static List<Integer> primeNumbersBruteForce(int max) {
-        final List<Integer> primeNumbers = new LinkedList<Integer>();
-        for (int i = 2; i <= max; i++) {
-            if (isPrimeBruteForce(i)) {
-                primeNumbers.add(i);
-            }
-        }
-        return primeNumbers;
-    }
-
-    private static boolean isPrimeBruteForce(int x) {
-        for (int i = 2; i < x; i++) {
-            if (x % i == 0) {
-                return false;
-            }
-        }
-        return true;
-    }
-
-    public static List<Integer> primeNumbersTill(int max) {
-        return IntStream.rangeClosed(2, max)
-            .filter(x -> isPrime(x))
-            .boxed()
-            .collect(Collectors.toList());
-    }
-
-    private static boolean isPrime(int x) {
-        return IntStream.rangeClosed(2, (int) (Math.sqrt(x)))
-            .allMatch(n -> x % n != 0);
-    }
-}

algorithms/src/test/java/com/baeldung/algorithms/prime/PrimeGeneratorUnitTest.java

@@ -1,28 +0,0 @@
-package com.baeldung.algorithms.prime;
-
-import static com.baeldung.algorithms.prime.PrimeGenerator.*;
-
-import java.util.Arrays;
-import java.util.List;
-import org.junit.Test;
-import static org.junit.Assert.*;
-
-public class PrimeGeneratorUnitTest {
-    @Test
-    public void whenBruteForced_returnsSuccessfully() {
-        final List<Integer> primeNumbers = primeNumbersBruteForce(20);
-        assertEquals(Arrays.asList(new Integer[] { 2, 3, 5, 7, 11, 13, 17, 19 }), primeNumbers);
-    }
-
-    @Test
-    public void whenOptimized_returnsSuccessfully() {
-        final List<Integer> primeNumbers = primeNumbersTill(20);
-        assertEquals(Arrays.asList(new Integer[] { 2, 3, 5, 7, 11, 13, 17, 19 }), primeNumbers);
-    }
-
-    @Test
-    public void whenSieveOfEratosthenes_returnsSuccessfully() {
-        final List<Integer> primeNumbers = sieveOfEratosthenes(20);
-        assertEquals(Arrays.asList(new Integer[] { 2, 3, 5, 7, 11, 13, 17, 19 }), primeNumbers);
-    }
-}

bootique/pom.xml

@@ -52,16 +52,21 @@
 
     <build>
         <plugins>
+
             <plugin>
                 <groupId>org.apache.maven.plugins</groupId>
                 <artifactId>maven-shade-plugin</artifactId>
+                <version>${maven-shade-plugin.version}</version>
             </plugin>
+
         </plugins>
     </build>
 
     <properties>
         <main.class>com.baeldung.bootique.App</main.class>
         <bootique-bom.version>0.23</bootique-bom.version>
+
+        <maven-shade-plugin.version>2.4.3</maven-shade-plugin.version>
     </properties>
 
 </project>

core-java-10/src/test/java/com/baeldung/java10/list/CopyListServiceUnitTest.java

@@ -0,0 +1,14 @@
+package com.baeldung.java10.list;
+
+import org.junit.Test;
+
+import java.util.Arrays;
+import java.util.List;
+
+public class CopyListServiceUnitTest {
+
+    @Test(expected = UnsupportedOperationException.class)
+    public void whenModifyCopyOfList_thenThrowsException() {
+        List<Integer> copyList = List.copyOf(Arrays.asList(1, 2, 3, 4));
+    }
+}

core-java-8/README.md

@@ -32,7 +32,6 @@
 - [“Stream has already been operated upon or closed” Exception in Java](http://www.baeldung.com/java-stream-operated-upon-or-closed-exception)
 - [Display All Time Zones With GMT And UTC in Java](http://www.baeldung.com/java-time-zones)
 - [Copy a File with Java](http://www.baeldung.com/java-copy-file)
-- [Generating Prime Numbers in Java](http://www.baeldung.com/java-generate-prime-numbers)
 - [Static and Default Methods in Interfaces in Java](http://www.baeldung.com/java-static-default-methods)
 - [Iterable to Stream in Java](http://www.baeldung.com/java-iterable-to-stream)
 - [Converting String to Stream of chars](http://www.baeldung.com/java-string-to-stream)

core-java-8/pom.xml

@@ -128,77 +128,6 @@
                 </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>
-                            <archiveBaseDirectory>${project.basedir}</archiveBaseDirectory>
-                            <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>
             <plugin>
                 <groupId>org.apache.maven.plugins</groupId>
                 <artifactId>maven-compiler-plugin</artifactId>

core-java-8/src/main/java/com/baeldung/list/CopyListService.java

@@ -0,0 +1,73 @@
+package com.baeldung.list;
+
+import java.util.ArrayList;
+import java.util.Collections;
+import java.util.List;
+import java.util.Optional;
+import java.util.stream.Collectors;
+import java.util.stream.Stream;
+
+public class CopyListService {
+
+    public List<Flower> copyListByConstructor(List<Flower> source) {
+        return new ArrayList<Flower>(source);
+    }
+
+    public List<Flower> copyListByConstructorAndEditOneFlowerInTheNewList(List<Flower> source) {
+        List<Flower> flowers = new ArrayList<>(source);
+        if(flowers.size() > 0) {
+            flowers.get(0).setPetals(flowers.get(0).getPetals() * 3);
+        }
+
+        return flowers;
+    }
+
+    public List<Flower> copyListByAddAllMethod(List<Flower> source) {
+        List<Flower> flowers = new ArrayList<>();
+        flowers.addAll(source);
+        return flowers;
+    }
+
+    public List<Flower> copyListByAddAllMethodAndEditOneFlowerInTheNewList(List<Flower> source) {
+        List<Flower> flowers = new ArrayList<>();
+        flowers.addAll(source);
+
+        if(flowers.size() > 0) {
+            flowers.get(0).setPetals(flowers.get(0).getPetals() * 3);
+        }
+
+        return flowers;
+    }
+
+    public List<Integer> copyListByCopyMethod(List<Integer> source, List<Integer> dest) {
+        Collections.copy(dest, source);
+        return dest;
+    }
+
+    public List<Flower> copyListByStream(List<Flower> source) {
+        return source.stream().collect(Collectors.toList());
+    }
+
+    public List<Flower> copyListByStreamAndSkipFirstElement(List<Flower> source) {
+        return source.stream().skip(1).collect(Collectors.toList());
+    }
+
+    public List<Flower> copyListByStreamWithFilter(List<Flower> source, Integer moreThanPetals) {
+        return source.stream().filter(f -> f.getPetals() > moreThanPetals).collect(Collectors.toList());
+    }
+
+    public List<Flower> copyListByStreamWithOptional(List<Flower> source) {
+        return Optional.ofNullable(source)
+                 .map(List::stream)
+                 .orElseGet(Stream::empty)
+                 .collect(Collectors.toList());
+    }
+
+    public List<Flower> copyListByStreamWithOptionalAndSkip(List<Flower> source) {
+        return Optional.ofNullable(source)
+                .map(List::stream)
+                .orElseGet(Stream::empty)
+                .skip(1)
+                .collect(Collectors.toList());
+    }
+}

core-java-8/src/main/java/com/baeldung/list/Flower.java

@@ -0,0 +1,28 @@
+package com.baeldung.list;
+
+public class Flower {
+
+    private String name;
+    private int petals;
+
+    public Flower(String name, int petals) {
+        this.name = name;
+        this.petals = petals;
+    }
+
+    public String getName() {
+        return name;
+    }
+
+    public void setName(String name) {
+        this.name = name;
+    }
+
+    public int getPetals() {
+        return petals;
+    }
+
+    public void setPetals(int petals) {
+        this.petals = petals;
+    }
+}

core-java-8/src/test/java/com/baeldung/list/CopyListServiceUnitTest.java

@@ -0,0 +1,129 @@
+package com.baeldung.list;
+
+import org.junit.Before;
+import org.junit.Test;
+
+import java.util.ArrayList;
+import java.util.Arrays;
+import java.util.List;
+
+import static org.junit.Assert.*;
+
+public class CopyListServiceUnitTest {
+
+    List<Flower> flowers;
+
+    private CopyListService copyListService;
+
+    @Before
+    public void init() {
+        this.copyListService = new CopyListService();
+        this.flowers = new ArrayList<>();
+
+        Flower poppy = new Flower("Poppy", 12);
+        flowers.add(poppy);
+        Flower anemone = new Flower("Anemone", 8);
+        flowers.add(anemone);
+        Flower catmint = new Flower("Catmint", 12);
+        flowers.add(catmint);
+        Flower diascia = new Flower("Diascia", 5);
+        flowers.add(diascia);
+        Flower iris = new Flower("Iris", 3);
+        flowers.add(iris);
+        Flower pansy = new Flower("Pansy", 5);
+        flowers.add(pansy);
+    }
+
+    @Test
+    public void givenAList_whenListDoesNotHaveNullElements_thenReturnAnotherListWithTheSameElementsByConstructor() {
+        List<Flower> copy = copyListService.copyListByConstructor(flowers);
+        assertEquals(copy.size(), flowers.size());
+        assertTrue(copy.containsAll(flowers));
+    }
+
+    @Test
+    public void givenAList_whenListDoesNotHaveNullElements_thenReturnAnotherListWithOneModifiedElementByConstructor() {
+        List<Flower> copy = copyListService.copyListByConstructorAndEditOneFlowerInTheNewList(flowers);
+        assertEquals(copy.size(), flowers.size());
+        assertTrue(copy.containsAll(flowers));
+    }
+
+    @Test
+    public void givenAList_whenListDoesNotHaveNullElements_thenReturnAnotherListWithTheSameElementsByAddAllmethod() {
+        List<Flower> copy = copyListService.copyListByAddAllMethod(flowers);
+        assertEquals(copy.size(), flowers.size());
+        assertTrue(copy.containsAll(flowers));
+    }
+
+    @Test
+    public void givenAList_whenListDoesNotHaveNullElements_thenReturnAnotherListWithOneModifiedElementByAddAllmethod() {
+        List<Flower> copy = copyListService.copyListByAddAllMethodAndEditOneFlowerInTheNewList(flowers);
+        assertEquals(copy.size(), flowers.size());
+        assertTrue(copy.containsAll(flowers));
+    }
+
+    @Test
+    public void givenAList_whenListsHaveSameSize_thenReturnAnotherListWithTheSameElementsByCopyMethod() {
+        List<Integer> source = Arrays.asList(1,2,3);
+        List<Integer> dest = Arrays.asList(4,5,6);
+
+        dest = copyListService.copyListByCopyMethod(source, dest);
+        assertEquals(dest.size(), source.size());
+        assertTrue(dest.containsAll(source));
+    }
+
+    @Test
+    public void givenAList_whenListsHaveDifferentSize_thenReturnAnotherListWithTheSameElementsByCopyMethod() {
+        List<Integer> source = Arrays.asList(1,2,3);
+        List<Integer> dest = Arrays.asList(5,6,7,8,9,10);
+
+        dest = copyListService.copyListByCopyMethod(source, dest);
+        assertNotEquals(dest.size(), source.size());
+        assertTrue(dest.containsAll(source));
+    }
+
+    @Test
+    public void givenAList_whenListDoesNotHaveNullElements_thenReturnAnotherListWithTheSameElementsByStreamProcess() {
+        List<Flower> copy = copyListService.copyListByStream(flowers);
+        assertEquals(copy.size(), flowers.size());
+        assertTrue(copy.containsAll(flowers));
+    }
+
+    @Test
+    public void givenAList_whenListDoesNotHaveNullElements_thenReturnAnotherListWithOneElementLessByStreamProcess() {
+        List<Flower> copy = copyListService.copyListByStreamAndSkipFirstElement(flowers);
+        assertNotEquals(copy.size(), flowers.size());
+        assertEquals(copy.size() + 1, flowers.size());
+        assertFalse(copy.containsAll(flowers));
+    }
+
+    @Test
+    public void givenAList_whenListDoesNotHaveNullElements_thenReturnAnotherListWithFilterElementsByStreamProcess() {
+        List<Flower> copy = copyListService.copyListByStreamWithFilter(flowers, 5);
+        assertNotEquals(copy.size(), flowers.size());
+        assertEquals(copy.size() + 3, flowers.size());
+        assertFalse(copy.containsAll(flowers));
+    }
+
+    @Test
+    public void givenAList_whenListIsNull_thenReturnEmptyListByStreamProcess() {
+        List<Flower> copy = copyListService.copyListByStreamWithOptional(null);
+        assertNotNull(copy);
+        assertEquals(copy.size(), 0);
+    }
+
+    @Test
+    public void givenAList_whenListIsNotNull_thenReturnAnotherListWithTheElementsByStreamProcess() {
+        List<Flower> copy = copyListService.copyListByStreamWithOptional(flowers);
+        assertEquals(copy.size(), flowers.size());
+        assertTrue(copy.containsAll(flowers));
+    }
+
+    @Test
+    public void givenAList_whenListIsNotNull_thenReturnAnotherListWithOneElementLessByStreamProcess() {
+        List<Flower> copy = copyListService.copyListByStreamWithOptionalAndSkip(flowers);
+        assertNotEquals(copy.size(), flowers.size());
+        assertEquals(copy.size() + 1, flowers.size());
+        assertFalse(copy.containsAll(flowers));
+    }
+}

core-java-collections/src/test/java/com/baeldung/java/set/HashSetInitalizingUnitTest.java

@@ -0,0 +1,81 @@
+package com.baeldung.java.set;
+
+import com.google.common.collect.ImmutableSet;
+import com.google.common.collect.Sets;
+import org.junit.jupiter.api.Test;
+  
+import java.util.Arrays;
+import java.util.Collections;
+import java.util.HashSet;
+import java.util.Set;
+import java.util.stream.Collectors;
+import java.util.stream.Stream;
+
+import static org.junit.Assert.assertEquals;
+
+public class HashSetInitalizingUnitTest {
+    @Test
+    public void whenUsingJava_usingArraysStaticMethod_thenCorrectSize() {
+        Set<String> set = new HashSet<>(Arrays.asList("a", "b", "c"));
+        assertEquals(3, set.size());
+    }
+
+    @Test
+    public void whenUsingJava_usingAnonymousClass_thenCorrectSize() {
+        Set<String> set = new HashSet<String>(){{
+            add("a");
+            add("b");
+            add("c");
+        }};
+        assertEquals(3, set.size());
+    }
+
+    @Test
+    public void whenUsingJava_creatingSingletonSet_thenCorrectSize() {
+        Set<String> set = Collections.singleton("a");
+        assertEquals(1, set.size());
+    }
+
+    public static final <T> Set<T> newHashSet(T... objs) {
+        Set<T> set = new HashSet<T>();
+        Collections.addAll(set, objs);
+        return set;
+    }
+
+    @Test
+    public void whenUsingJava_usingCustomStaticUtilMethod_thenCorrectSize() {
+        Set<String> set = newHashSet("a","b","c");
+        assertEquals(3, set.size());
+    }
+
+    @Test
+    public void whenUsingJava8_usingCollectOnStream_thenCorrectSize() {
+        Set<String> set = Stream.of("a", "b", "c").collect(Collectors.toSet());
+        assertEquals(3, set.size());
+    }
+    @Test
+    public void whenUsingJava8_fromStringArray_thenCorrectSize() {
+        String[] stringArray = {"a","b","c"};
+        Set<String> set = Arrays.stream(stringArray).collect(Collectors.toCollection(HashSet::new));
+        assertEquals(3, set.size());
+    }
+
+    // Requires Java9 - uncomment if you are using Java 9 or higher
+    /*@Test
+    public void whenUsingJava9_usingCollectOnStream_thenCorrectSize() {
+        Set set = Set.of("a", "b", "c");
+        assertEquals(3, set.size());
+    }*/
+
+    @Test
+    public void whenUsingGoogleGuava_createMutableSet_thenCorrectSize() {
+        Set<String> set = Sets.newHashSet("a", "b", "c");
+        assertEquals(3, set.size());
+    }
+
+    @Test
+    public void whenUsingGoogleGuava_createImmutableSet_thenCorrectSize() {
+        Set<String> set = ImmutableSet.of("a", "b", "c");
+        assertEquals(3, set.size());
+    }
+}

core-java-concurrency/pom.xml

@@ -75,92 +75,7 @@
                     </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>
-                            <archiveBaseDirectory>${project.basedir}</archiveBaseDirectory>
-                            <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>
-            <plugin>
-                <groupId>org.springframework.boot</groupId>
-                <artifactId>spring-boot-maven-plugin</artifactId>
-                <executions>
-                    <execution>
-                        <goals>
-                            <goal>repackage</goal>
-                        </goals>
-                        <configuration>
-                            <classifier>spring-boot</classifier>
-                            <mainClass>org.baeldung.executable.ExecutableMavenJar</mainClass>
-                        </configuration>
-                    </execution>
-                </executions>
-            </plugin>
+            
         </plugins>
     </build>
 

core-java-sun/pom.xml

@@ -185,6 +185,7 @@
             <plugin>
                 <groupId>org.apache.maven.plugins</groupId>
                 <artifactId>maven-jar-plugin</artifactId>
+                <version>${maven-jar-plugin.version}</version>
                 <configuration>
                     <archive>
                         <manifest>
@@ -195,79 +196,6 @@
                     </archive>
                 </configuration>
             </plugin>
-            <plugin>
-                <groupId>org.apache.maven.plugins</groupId>
-                <artifactId>maven-assembly-plugin</artifactId>
-                <executions>
-                    <execution>
-                        <phase>package</phase>
-                        <goals>
-                            <goal>single</goal>
-                        </goals>
-                        <configuration>
-                            <archiveBaseDirectory>${project.basedir}</archiveBaseDirectory>
-                            <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>
-            <plugin>
-                <groupId>org.springframework.boot</groupId>
-                <artifactId>spring-boot-maven-plugin</artifactId>
-                <executions>
-                    <execution>
-                        <goals>
-                            <goal>repackage</goal>
-                        </goals>
-                        <configuration>
-                            <classifier>spring-boot</classifier>
-                            <mainClass>org.baeldung.executable.ExecutableMavenJar</mainClass>
-                        </configuration>
-                    </execution>
-                </executions>
-            </plugin>
             <plugin>
                 <groupId>org.codehaus.mojo</groupId>
                 <artifactId>exec-maven-plugin</artifactId>
@@ -368,6 +296,7 @@
         <protonpack.version>1.13</protonpack.version>
         <streamex.version>0.6.5</streamex.version>
         <vavr.version>0.9.0</vavr.version>
+        <spring-web.version>4.3.4.RELEASE</spring-web.version>
 
         <!-- testing -->
         <assertj.version>3.6.1</assertj.version>
@@ -376,7 +305,7 @@
         <!-- maven plugins -->
         <maven-surefire-plugin.version>2.19.1</maven-surefire-plugin.version>
         <sun-tools.version>1.8.0</sun-tools.version>
-        <spring-web.version>4.3.4.RELEASE</spring-web.version>
+        <maven-jar-plugin.version>3.0.2</maven-jar-plugin.version>
     </properties>
 
 </project>

core-java/README.md

@@ -3,7 +3,6 @@
 ## Core Java Cookbooks and Examples
 
 ### Relevant Articles: 
-- [Java – Random Long, Float, Integer and Double](http://www.baeldung.com/java-generate-random-long-float-integer-double)
 - [Java – Generate Random String](http://www.baeldung.com/java-random-string)
 - [Java Timer](http://www.baeldung.com/java-timer-and-timertask)
 - [How to Run a Shell Command in Java](http://www.baeldung.com/run-shell-command-in-java)
@@ -38,7 +37,6 @@
 - [A Quick JUnit vs TestNG Comparison](http://www.baeldung.com/junit-vs-testng)
 - [Java Primitive Conversions](http://www.baeldung.com/java-primitive-conversions)
 - [Java Money and the Currency API](http://www.baeldung.com/java-money-and-currency)
-- [Using Math.pow in Java](http://www.baeldung.com/java-math-pow)
 - [Converting Strings to Enums in Java](http://www.baeldung.com/java-string-to-enum)
 - [Quick Guide to the Java StringTokenizer](http://www.baeldung.com/java-stringtokenizer)
 - [JVM Log Forging](http://www.baeldung.com/jvm-log-forging)
@@ -49,7 +47,6 @@
 - [How to Add a Single Element to a Stream](http://www.baeldung.com/java-stream-append-prepend)
 - [Iterating Over Enum Values in Java](http://www.baeldung.com/java-enum-iteration)
 - [Kotlin Java Interoperability](http://www.baeldung.com/kotlin-java-interoperability)
-- [How to Round a Number to N Decimal Places in Java](http://www.baeldung.com/java-round-decimal-number)
 - [Changing Annotation Parameters At Runtime](http://www.baeldung.com/java-reflection-change-annotation-params)
 - [How to Find all Getters Returning Null](http://www.baeldung.com/java-getters-returning-null)
 - [Changing the Order in a Sum Operation Can Produce Different Results?](http://www.baeldung.com/java-floating-point-sum-order)
@@ -77,7 +74,6 @@
 - [“Sneaky Throws” in Java](http://www.baeldung.com/java-sneaky-throws)
 - [OutOfMemoryError: GC Overhead Limit Exceeded](http://www.baeldung.com/java-gc-overhead-limit-exceeded)
 - [StringBuilder and StringBuffer in Java](http://www.baeldung.com/java-string-builder-string-buffer)
-- [Number of Digits in an Integer in Java](http://www.baeldung.com/java-number-of-digits-in-int)
 - [Creating a Java Compiler Plugin](http://www.baeldung.com/java-build-compiler-plugin)
 - [A Guide to the Static Keyword in Java](http://www.baeldung.com/java-static)
 - [Initializing Arrays in Java](http://www.baeldung.com/java-initialize-array)
@@ -132,7 +128,6 @@
 - [Find Sum and Average in a Java Array](http://www.baeldung.com/java-array-sum-average)
 - [Java List UnsupportedOperationException](http://www.baeldung.com/java-list-unsupported-operation-exception)
 - [Type Erasure in Java Explained](http://www.baeldung.com/java-type-erasure)
-- [BigDecimal and BigInteger in Java](http://www.baeldung.com/java-bigdecimal-biginteger)
 - [Display All Time Zones With GMT And UTC in Java](http://www.baeldung.com/java-time-zones)
 - [Join and Split Arrays and Collections in Java](http://www.baeldung.com/java-join-and-split)
 - [Check If Two Lists are Equal in Java](http://www.baeldung.com/java-test-a-list-for-ordinality-and-equality)
@@ -147,7 +142,6 @@
 - [Check If a String Is Numeric in Java](http://www.baeldung.com/java-check-string-number)
 - [Variable and Method Hiding in Java](http://www.baeldung.com/java-variable-method-hiding)
 - [Access Modifiers in Java](http://www.baeldung.com/java-access-modifiers)
-- [NaN in Java](http://www.baeldung.com/java-not-a-number)
 - [Infinite Loops in Java](http://www.baeldung.com/infinite-loops-java)
 - [Why Use char[] Array Over a String for Storing Passwords in Java?](http://www.baeldung.com/java-storing-passwords)
 - [Introduction to Creational Design Patterns](http://www.baeldung.com/creational-design-patterns)

core-java/pom.xml

@@ -25,16 +25,6 @@
             <artifactId>commons-lang3</artifactId>
             <version>${commons-lang3.version}</version>
         </dependency>
-        <dependency>
-            <groupId>org.apache.commons</groupId>
-            <artifactId>commons-math3</artifactId>
-            <version>${commons-math3.version}</version>
-        </dependency>
-        <dependency>
-            <groupId>org.decimal4j</groupId>
-            <artifactId>decimal4j</artifactId>
-            <version>${decimal4j.version}</version>
-        </dependency>
         <dependency>
             <groupId>org.bouncycastle</groupId>
             <artifactId>bcprov-jdk15on</artifactId>
@@ -393,6 +383,7 @@
         <commons-lang3.version>3.5</commons-lang3.version>
         <bouncycastle.version>1.55</bouncycastle.version>
         <commons-codec.version>1.10</commons-codec.version>
+        <commons-io.version>2.5</commons-io.version>
         <commons-math3.version>3.6.1</commons-math3.version>
         <decimal4j.version>1.0.3</decimal4j.version>
         <unix4j.version>0.4</unix4j.version>

core-java/src/main/java/com/baeldung/maths/BigDecimalImpl.java

@@ -1,18 +0,0 @@
-package com.baeldung.maths;
-
-import java.math.BigDecimal;
-import java.math.RoundingMode;
-
-public class BigDecimalImpl {
-
-    public static void main(String[] args) {
-
-        BigDecimal serviceTax = new BigDecimal("56.0084578639");
-        serviceTax = serviceTax.setScale(2, RoundingMode.CEILING);
-
-        BigDecimal entertainmentTax = new BigDecimal("23.00689");
-        entertainmentTax = entertainmentTax.setScale(2, RoundingMode.FLOOR);
-
-        BigDecimal totalTax = serviceTax.add(entertainmentTax);
-    }
-}

core-java/src/main/java/com/baeldung/maths/BigIntegerImpl.java

@@ -1,16 +0,0 @@
-package com.baeldung.maths;
-
-import java.math.BigInteger;
-
-public class BigIntegerImpl {
-
-    public static void main(String[] args) {
-
-        BigInteger numStarsMilkyWay = new BigInteger("8731409320171337804361260816606476");
-        BigInteger numStarsAndromeda = new BigInteger("5379309320171337804361260816606476");
-
-        BigInteger totalStars = numStarsMilkyWay.add(numStarsAndromeda);
-
-    }
-
-}

disruptor/pom.xml

@@ -55,6 +55,7 @@
             <plugin>
                 <groupId>org.apache.maven.plugins</groupId>
                 <artifactId>maven-jar-plugin</artifactId>
+                <version>${maven-jar-plugin.version}</version>
                 <configuration>
                     <archive>
                         <manifest>
@@ -91,6 +92,7 @@
             <plugin>
                 <groupId>org.apache.maven.plugins</groupId>
                 <artifactId>maven-shade-plugin</artifactId>
+                <version>${maven-shade-plugin.version}</version>
                 <executions>
                     <execution>
                         <goals>
@@ -133,6 +135,9 @@
         <!-- testing -->
         <testng.version>6.10</testng.version>
         <assertj.version>3.6.1</assertj.version>
+        
+        <maven-shade-plugin.version>2.4.3</maven-shade-plugin.version>
+        <maven-jar-plugin.version>3.0.2</maven-jar-plugin.version>
     </properties>
 
 </project>

ejb/ejb-remote/pom.xml

@@ -74,7 +74,7 @@
                             <port>9990</port>
                             <username>testUser</username>
                             <password>admin1234!</password>
-                            <filename>${build.finalName}.jar</filename>
+                            <filename>${project.build.finalName}.jar</filename>
                         </configuration>
                     </plugin>
                 </plugins>

google-web-toolkit/pom.xml

@@ -1,27 +1,14 @@
 <?xml version="1.0" encoding="UTF-8"?>
-<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+<project xmlns="http://maven.apache.org/POM/4.0.0"
+	xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
 	xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/maven-v4_0_0.xsd">
 
 	<!-- POM file generated with GWT webAppCreator -->
 	<modelVersion>4.0.0</modelVersion>
 	<groupId>com.baeldung</groupId>
-  <artifactId>google_web_toolkit</artifactId>
+	<artifactId>google-web-toolkit</artifactId>
 	<packaging>war</packaging>
 	<version>1.0-SNAPSHOT</version>
-  <name>com.baeldung.Google_web_toolkit</name>
-
-  <properties>
-
-    <!-- Setting maven.compiler.source to something different to 1.8
-         needs that you configure the sourceLevel in gwt-maven-plugin since
-         GWT compiler 2.8 requires 1.8 (see gwt-maven-plugin block below) -->
-    <maven.compiler.source>1.8</maven.compiler.source>
-    <maven.compiler.target>1.8</maven.compiler.target>
-
-    <!-- Don't let your Mac use a crazy non-standard encoding -->
-    <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
-    <project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
-  </properties>
 
 	<dependencyManagement>
 		<dependencies>
@@ -61,7 +48,8 @@
 	</dependencies>
 
 	<build>
-    <!-- Output classes directly into the webapp, so that IDEs and "mvn process-classes" update them in DevMode -->
+		<!-- Output classes directly into the webapp, so that IDEs and "mvn process-classes" 
+			update them in DevMode -->
 		<outputDirectory>${project.build.directory}/${project.build.finalName}/WEB-INF/classes</outputDirectory>
 
 		<plugins>
@@ -83,8 +71,8 @@
 					<moduleName>com.baeldung.Google_web_toolkit</moduleName>
 					<moduleShortName>Google_web_toolkit</moduleShortName>
 					<failOnError>true</failOnError>
-          <!-- GWT compiler 2.8 requires 1.8, hence define sourceLevel here if you use
-               a different source language for java compilation -->
+					<!-- GWT compiler 2.8 requires 1.8, hence define sourceLevel here if 
+						you use a different source language for java compilation -->
 					<sourceLevel>1.8</sourceLevel>
 					<!-- Compiler configuration -->
 					<compilerArgs>
@@ -113,4 +101,18 @@
 
 		</plugins>
 	</build>
+	
+	<properties>
+
+		<!-- Setting maven.compiler.source to something different to 1.8 needs 
+			that you configure the sourceLevel in gwt-maven-plugin since GWT compiler 
+			2.8 requires 1.8 (see gwt-maven-plugin block below) -->
+		<maven.compiler.source>1.8</maven.compiler.source>
+		<maven.compiler.target>1.8</maven.compiler.target>
+
+		<!-- Don't let your Mac use a crazy non-standard encoding -->
+		<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
+		<project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
+	</properties>
+	
 </project>

java-ee-8-security-api/pom.xml

@@ -3,32 +3,27 @@
          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>java-ee-8-security-api</artifactId>
     <version>1.0-SNAPSHOT</version>
     <packaging>pom</packaging>
 
-    <modules>
-        <module>app-auth-basic-store-db</module>
-        <module>app-auth-form-store-ldap</module>
-        <module>app-auth-custom-form-store-custom</module>
-        <module>app-auth-custom-no-store</module>
-    </modules>
-
     <dependencies>
+    
         <dependency>
             <groupId>javax</groupId>
             <artifactId>javaee-web-api</artifactId>
             <version>${javaee-version}</version>
             <scope>provided</scope>
         </dependency>
+        
     </dependencies>
 
     <build>
         <plugins>
             <plugin>
                 <artifactId>maven-war-plugin</artifactId>
+                <version>${maven-war-plugin.version}</version>
                 <configuration>
                     <failOnMissingWebXml>false</failOnMissingWebXml>
                     <packagingExcludes>pom.xml</packagingExcludes>
@@ -69,6 +64,15 @@
         <liberty-maven-plugin.version>2.3</liberty-maven-plugin.version>
         <openliberty-runtime.version>18.0.0.1</openliberty-runtime.version>
         <h2-version>1.4.197</h2-version>
+        
+        <maven-war-plugin.version>3.2.2</maven-war-plugin.version>
     </properties>
 
+    <modules>
+        <module>app-auth-basic-store-db</module>
+        <module>app-auth-form-store-ldap</module>
+        <module>app-auth-custom-form-store-custom</module>
+        <module>app-auth-custom-no-store</module>
+    </modules>
+
 </project>

java-numbers/.gitignore

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

java-numbers/README.md

@@ -0,0 +1,14 @@
+=========
+
+## Java Number Cookbooks and Examples
+
+### Relevant Articles: 
+- [Number of Digits in an Integer in Java](http://www.baeldung.com/java-number-of-digits-in-int)
+- [NaN in Java](http://www.baeldung.com/java-not-a-number)
+- [How to Round a Number to N Decimal Places in Java](http://www.baeldung.com/java-round-decimal-number)
+- [Check If a Number Is Prime in Java](http://www.baeldung.com/java-prime-numbers)
+- [Using Math.pow in Java](http://www.baeldung.com/java-math-pow)
+- [Generating Prime Numbers in Java](http://www.baeldung.com/java-generate-prime-numbers)
+- [BigDecimal and BigInteger in Java](http://www.baeldung.com/java-bigdecimal-biginteger)
+- [Find All Pairs of Numbers in an Array That Add Up to a Given Sum](http://www.baeldung.com/java-algorithm-number-pairs-sum)
+- [Java – Random Long, Float, Integer and Double](http://www.baeldung.com/java-generate-random-long-float-integer-double)

java-numbers/pom.xml

@@ -0,0 +1,163 @@
+<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>java-numbers</artifactId>
+    <version>0.1.0-SNAPSHOT</version>
+    <packaging>jar</packaging>
+    <name>java-numbers</name>
+
+    <parent>
+        <groupId>com.baeldung</groupId>
+        <artifactId>parent-java</artifactId>
+        <version>0.0.1-SNAPSHOT</version>
+        <relativePath>../parent-java</relativePath>
+    </parent>
+    <dependencies>
+        <dependency>
+            <groupId>log4j</groupId>
+            <artifactId>log4j</artifactId>
+            <version>${log4j.version}</version>
+        </dependency>
+        <dependency>
+            <groupId>org.slf4j</groupId>
+            <artifactId>slf4j-api</artifactId>
+            <version>${org.slf4j.version}</version>
+        </dependency>
+        <dependency>
+            <groupId>ch.qos.logback</groupId>
+            <artifactId>logback-classic</artifactId>
+            <version>${logback.version}</version>
+        </dependency>
+        <dependency>
+            <groupId>org.openjdk.jmh</groupId>
+            <artifactId>jmh-core</artifactId>
+            <version>${jmh-core.version}</version>
+        </dependency>
+        <dependency>
+            <groupId>org.openjdk.jmh</groupId>
+            <artifactId>jmh-generator-annprocess</artifactId>
+            <version>${jmh-generator-annprocess.version}</version>
+        </dependency>
+        <dependency>
+            <groupId>org.apache.commons</groupId>
+            <artifactId>commons-math3</artifactId>
+            <version>${commons-math3.version}</version>
+        </dependency>
+        <dependency>
+            <groupId>org.apache.commons</groupId>
+            <artifactId>commons-lang3</artifactId>
+            <version>${commons-lang3.version}</version>
+        </dependency>
+        <dependency>
+            <groupId>org.decimal4j</groupId>
+            <artifactId>decimal4j</artifactId>
+            <version>${decimal4j.version}</version>
+        </dependency>
+        <dependency>
+            <groupId>org.assertj</groupId>
+            <artifactId>assertj-core</artifactId>
+            <version>${assertj.version}</version>
+            <scope>test</scope>
+        </dependency>
+    </dependencies>
+
+    <build>
+        <finalName>java-numbers</finalName>
+        <resources>
+            <resource>
+                <directory>src/main/resources</directory>
+                <filtering>true</filtering>
+            </resource>
+        </resources>
+
+        <plugins>
+            <plugin>
+                <groupId>org.apache.maven.plugins</groupId>
+                <artifactId>maven-surefire-plugin</artifactId>
+                <configuration>
+                    <excludes>
+                        <exclude>**/*IntegrationTest.java</exclude>
+                    </excludes>
+                    <testFailureIgnore>true</testFailureIgnore>
+                </configuration>
+            </plugin>
+
+            <plugin>
+                <groupId>org.apache.maven.plugins</groupId>
+                <artifactId>maven-dependency-plugin</artifactId>
+                <executions>
+                    <execution>
+                        <id>copy-dependencies</id>
+                        <phase>prepare-package</phase>
+                        <goals>
+                            <goal>copy-dependencies</goal>
+                        </goals>
+                        <configuration>
+                            <outputDirectory>${project.build.directory}/libs</outputDirectory>
+                        </configuration>
+                    </execution>
+                </executions>
+            </plugin>
+
+            <plugin>
+                <groupId>org.apache.maven.plugins</groupId>
+                <artifactId>maven-javadoc-plugin</artifactId>
+                <version>${maven-javadoc-plugin.version}</version>
+                <configuration>
+                    <source>1.8</source>
+                    <target>1.8</target>
+                </configuration>
+            </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>
+                                <configuration>
+                                    <includes>
+                                        <include>**/*IntegrationTest.java</include>
+                                    </includes>
+                                </configuration>
+                            </execution>
+                        </executions>
+                        <configuration>
+                            <systemPropertyVariables>
+                                <test.mime>json</test.mime>
+                            </systemPropertyVariables>
+                        </configuration>
+                    </plugin>
+                </plugins>
+            </build>
+        </profile>
+    </profiles>
+
+    <properties>
+        <commons-math3.version>3.6.1</commons-math3.version>
+        <decimal4j.version>1.0.3</decimal4j.version>
+        <commons-lang3.version>3.5</commons-lang3.version>
+
+        <assertj.version>3.6.1</assertj.version>
+
+        <org.slf4j.version>1.7.21</org.slf4j.version>
+        <logback.version>1.1.7</logback.version>
+        <jmh-core.version>1.19</jmh-core.version>
+        <jmh-generator-annprocess.version>1.19</jmh-generator-annprocess.version>
+
+        <maven-surefire-plugin.version>2.19.1</maven-surefire-plugin.version>
+        <maven-javadoc-plugin.version>3.0.0-M1</maven-javadoc-plugin.version>
+        <maven-jar-plugin.version>3.0.2</maven-jar-plugin.version>
+    </properties>
+</project>

java-numbers/src/main/java/com/baeldung/algorithms/primechecker/BruteForcePrimeChecker.java

@@ -1,7 +1,6 @@
 package com.baeldung.algorithms.primechecker;
 
 import java.util.stream.IntStream;
-import java.util.stream.LongStream;
 
 public class BruteForcePrimeChecker implements PrimeChecker<Integer> {
 
@@ -12,5 +11,4 @@ public class BruteForcePrimeChecker implements PrimeChecker<Integer>{
             .noneMatch(n -> (number % n == 0)) : false;
     }
 
-    
 }

java-numbers/src/main/java/com/baeldung/algorithms/primechecker/OptimisedPrimeChecker.java

@@ -1,7 +1,6 @@
 package com.baeldung.algorithms.primechecker;
 
 import java.util.stream.IntStream;
-import java.util.stream.LongStream;
 
 public class OptimisedPrimeChecker implements PrimeChecker<Integer> {
 
@@ -11,5 +10,4 @@ public class OptimisedPrimeChecker implements PrimeChecker<Integer>{
             .noneMatch(n -> (number % n == 0)) : false;
     }
 
-    
 }

java-numbers/src/main/java/com/baeldung/pairsaddupnumber/DifferentPairs.java

@@ -1,4 +1,4 @@
-package com.baeldung.algorithms.pairsaddupnumber;
+package com.baeldung.pairsaddupnumber;
 
 
 import java.util.ArrayList;
@@ -23,7 +23,7 @@ public class DifferentPairs {
     public static List<Integer> findPairsWithForLoop(int[] input, int sum) {
         final List<Integer> allDifferentPairs = new ArrayList<>();
         // Aux. hash map
-        final Map<Integer, Integer> pairs = new HashMap();
+        final Map<Integer, Integer> pairs = new HashMap<>();
         for (int i : input) {
             if (pairs.containsKey(i)) {
                 if (pairs.get(i) != null) {
@@ -51,7 +51,7 @@ public class DifferentPairs {
     public static List<Integer> findPairsWithStreamApi(int[] input, int sum) {
         final List<Integer> allDifferentPairs = new ArrayList<>();
         // Aux. hash map
-        final Map<Integer, Integer> pairs = new HashMap();
+        final Map<Integer, Integer> pairs = new HashMap<>();
         IntStream.range(0, input.length).forEach(i -> {
                     if (pairs.containsKey(input[i])) {
                         if (pairs.get(input[i]) != null) {

java-numbers/src/main/java/com/baeldung/pairsaddupnumber/ExistingPairs.java

@@ -1,4 +1,4 @@
-package com.baeldung.algorithms.pairsaddupnumber;
+package com.baeldung.pairsaddupnumber;
 
 
 import java.util.ArrayList;

java-numbers/src/main/java/com/baeldung/pairsaddupnumber/FindPairs.java

@@ -1,4 +1,4 @@
-package com.baeldung.algorithms.pairsaddupnumber;
+package com.baeldung.pairsaddupnumber;
 
 import java.util.ArrayList;
 import java.util.List;

java-numbers/src/main/resources/log4j.properties

@@ -0,0 +1,6 @@
+log4j.rootLogger=DEBUG, A1
+
+log4j.appender.A1=org.apache.log4j.ConsoleAppender
+
+log4j.appender.A1.layout=org.apache.log4j.PatternLayout
+log4j.appender.A1.layout.ConversionPattern=%-4r [%t] %-5p %c %x - %m%n

java-numbers/src/main/resources/logback.xml

@@ -0,0 +1,13 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<configuration>
+    <appender name="STDOUT" class="ch.qos.logback.core.ConsoleAppender">
+        <encoder>
+            <pattern>web - %date [%thread] %-5level %logger{36} - %message%n
+            </pattern>
+        </encoder>
+    </appender>
+
+    <root level="INFO">
+        <appender-ref ref="STDOUT" />
+    </root>
+</configuration>

java-numbers/src/test/java/com/baeldung/algorithms/primechecker/PrimeCheckerUnitTest.java

@@ -37,7 +37,6 @@ public class PrimeCheckerUnitTest {
         assertFalse(bfPrimeChecker.isPrime(1001));
     }
 
-
     private final OptimisedPrimeChecker optimisedPrimeChecker = new OptimisedPrimeChecker();
 
     @Test

java-numbers/src/test/java/com/baeldung/maths/RoundUnitTest.java

@@ -5,9 +5,6 @@ import org.decimal4j.util.DoubleRounder;
 import org.junit.Assert;
 import org.junit.Test;
 
-import static org.junit.Assert.assertEquals;
-import static org.junit.Assert.assertNotEquals;
-
 public class RoundUnitTest {
     private double value = 2.03456d;
     private int places = 2;

java-numbers/src/test/java/com/baeldung/pairsaddupnumber/DifferentPairsUnitTest.java

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

java-numbers/src/test/java/com/baeldung/pairsaddupnumber/ExistingPairsUnitTest.java

@@ -1,4 +1,4 @@
-package com.baeldung.algorithms.pairsaddupnumber;
+package com.baeldung.pairsaddupnumber;
 
 import org.junit.Test;
 import java.util.List;

java-numbers/src/test/java/com/baeldung/prime/PrimeGeneratorUnitTest.java

@@ -1,10 +1,10 @@
 package com.baeldung.prime;
 
-import static com.baeldung.prime.PrimeGenerator.*;
-
 import java.util.Arrays;
 import java.util.List;
 import org.junit.Test;
+
+import static com.baeldung.prime.PrimeGenerator.*;
 import static org.junit.Assert.*;
 
 public class PrimeGeneratorUnitTest {

java-numbers/src/test/java/com/baeldung/random/JavaRandomUnitTest.java

@@ -1,4 +1,4 @@
-package org.baeldung.java;
+package com.baeldung.random;
 
 import org.apache.commons.lang3.RandomStringUtils;
 import org.apache.commons.math3.random.RandomDataGenerator;

jhipster/jhipster-monolithic/pom.xml

@@ -6,7 +6,7 @@
     <artifactId>jhipster-monolithic</artifactId>
     <version>0.0.1-SNAPSHOT</version>
     <packaging>war</packaging>
-    <name>JHipster Monolithic Application</name>
+    <description>JHipster Monolithic Application</description>
 
     <parent>
         <artifactId>parent-boot-1</artifactId>

jmh/pom.xml

@@ -33,6 +33,7 @@
             <plugin>
                 <groupId>org.apache.maven.plugins</groupId>
                 <artifactId>maven-jar-plugin</artifactId>
+                <version>${maven-jar-plugin.version}</version>
                 <configuration>
                     <archive>
                         <manifest>
@@ -46,6 +47,7 @@
 
     <properties>
         <openjdk.jmh.version>1.19</openjdk.jmh.version>
+        <maven-jar-plugin.version>3.0.2</maven-jar-plugin.version>
     </properties>
 
 </project>

jooby/pom.xml

@@ -44,6 +44,7 @@
             <plugin>
                 <groupId>org.apache.maven.plugins</groupId>
                 <artifactId>maven-shade-plugin</artifactId>
+                <version>${maven-shade-plugin.version}</version>
             </plugin>
         </plugins>
     </build>
@@ -52,6 +53,8 @@
         <jooby.version>1.1.3</jooby.version>
         <application.class>com.baeldung.jooby.App</application.class>
         <jooby-jedis.version>1.1.3</jooby-jedis.version>
+        
+        <maven-shade-plugin.version>2.4.3</maven-shade-plugin.version>
     </properties>
 
 </project>

micronaut/.mvn/wrapper/MavenWrapperDownloader.java

@@ -106,5 +106,4 @@ public class MavenWrapperDownloader {
         fos.close();
         rbc.close();
     }
-
 }

msf4j/pom.xml

@@ -1,10 +1,10 @@
-<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+<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.msf4j</groupId>
 	<artifactId>msf4j</artifactId>
 	<version>0.0.1-SNAPSHOT</version>
-    <name>WSO2 MSF4J Microservice</name>
 
 	<parent>
 		<groupId>org.wso2.msf4j</groupId>

parent-boot-2/pom.xml

@@ -5,8 +5,7 @@
     <artifactId>parent-boot-2</artifactId>
     <version>0.0.1-SNAPSHOT</version>
     <packaging>pom</packaging>
-    <name>Parent Boot 2</name>
-    <description>Parent for all spring boot 2 modules</description>
+    <description>Parent for all Spring Boot 2 modules</description>
 
     <parent>
         <groupId>org.springframework.boot</groupId>

persistence-modules/spring-hibernate-5/src/main/java/com/baeldung/hibernate/manytomany/model/Employee.java

@@ -3,13 +3,15 @@ package com.baeldung.hibernate.manytomany.model;
 import java.io.Serializable;
 import java.util.HashSet;
 import java.util.Set;
+
 import javax.persistence.CascadeType;
 import javax.persistence.Column;
 import javax.persistence.Entity;
 import javax.persistence.GeneratedValue;
+import javax.persistence.GenerationType;
 import javax.persistence.Id;
-import javax.persistence.JoinTable;
 import javax.persistence.JoinColumn;
+import javax.persistence.JoinTable;
 import javax.persistence.ManyToMany;
 import javax.persistence.Table;
 
@@ -18,7 +20,7 @@ import javax.persistence.Table;
 public class Employee implements Serializable {
     @Id
     @Column(name = "employee_id")
-    @GeneratedValue
+    @GeneratedValue(strategy = GenerationType.IDENTITY)
     private Long employeeId;
 
     @Column(name = "first_name")

persistence-modules/spring-hibernate-5/src/main/java/com/baeldung/hibernatesearch/HibernateSearchConfig.java

@@ -50,6 +50,8 @@ public class HibernateSearchConfig {
         final BasicDataSource dataSource = new BasicDataSource();
         dataSource.setDriverClassName(Preconditions.checkNotNull(env.getProperty("jdbc.driverClassName")));
         dataSource.setUrl(Preconditions.checkNotNull(env.getProperty("jdbc.url")));
+        dataSource.setUsername(env.getProperty("jdbc.user"));
+        dataSource.setPassword(env.getProperty("jdbc.pass"));
 
         return dataSource;
     }

persistence-modules/spring-hibernate-5/src/main/java/com/baeldung/manytomany/spring/PersistenceConfig.java

@@ -19,7 +19,7 @@ import org.springframework.transaction.annotation.EnableTransactionManagement;
 
 @Configuration
 @EnableTransactionManagement
-@PropertySource({ "classpath:persistence-mysql.properties" })
+@PropertySource({ "classpath:persistence-h2.properties" })
 @ComponentScan({ "com.baeldung.hibernate.manytomany" })
 public class PersistenceConfig {
 
@@ -61,7 +61,7 @@ public class PersistenceConfig {
     
     private final Properties hibernateProperties() {
         final Properties hibernateProperties = new Properties();
-        //hibernateProperties.setProperty("hibernate.hbm2ddl.auto", env.getProperty("hibernate.hbm2ddl.auto"));
+        hibernateProperties.setProperty("hibernate.hbm2ddl.auto", env.getProperty("hibernate.hbm2ddl.auto"));
         hibernateProperties.setProperty("hibernate.dialect", env.getProperty("hibernate.dialect"));
         hibernateProperties.setProperty("hibernate.show_sql", "true");
      

persistence-modules/spring-hibernate-5/src/main/java/com/baeldung/spring/PersistenceConfig.java

@@ -21,7 +21,7 @@ import java.util.Properties;
 
 @Configuration
 @EnableTransactionManagement
-@PropertySource({ "classpath:persistence-mysql.properties" })
+@PropertySource({ "classpath:persistence-h2.properties" })
 @ComponentScan({ "com.baeldung.persistence" })
 public class PersistenceConfig {
 

persistence-modules/spring-hibernate-5/src/main/resources/persistence-h2.properties

@@ -3,7 +3,7 @@ jdbc.driverClassName=org.h2.Driver
 jdbc.url=jdbc:h2:mem:db;DB_CLOSE_DELAY=-1
 jdbc.eventGeneratedId=sa
 jdbc.user=sa
-jdbc.pass=sa
+jdbc.pass=
 
 # hibernate.X
 hibernate.dialect=org.hibernate.dialect.H2Dialect

persistence-modules/spring-hibernate-5/src/test/resources/manytomany.cfg.xml

@@ -0,0 +1,16 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<!DOCTYPE hibernate-configuration PUBLIC
+		"-//Hibernate/Hibernate Configuration DTD 3.0//EN"
+		"http://hibernate.org/dtd/hibernate-configuration-3.0.dtd">
+<hibernate-configuration>
+    <session-factory>
+        <property name="hibernate.connection.driver_class">org.h2.Driver</property>
+        <property name="hibernate.connection.password"></property>
+        <property name="hibernate.connection.url">jdbc:h2:mem:spring_hibernate_many_to_many</property>
+        <property name="hibernate.connection.username">sa</property>
+        <property name="hibernate.dialect">org.hibernate.dialect.H2Dialect</property>
+        <property name="hibernate.current_session_context_class">thread</property>
+        <property name="hibernate.show_sql">true</property>
+        <property name="hibernate.hbm2ddl.auto">create-drop</property>
+    </session-factory>
+</hibernate-configuration>

persistence-modules/spring-jpa/src/main/java/org/baeldung/config/PersistenceJPAConfig.java

@@ -24,7 +24,7 @@ import com.google.common.base.Preconditions;
 
 @Configuration
 @EnableTransactionManagement
-@PropertySource({ "classpath:persistence-mysql.properties" })
+@PropertySource({ "classpath:persistence-h2.properties" })
 @ComponentScan({ "org.baeldung.persistence" })
 @EnableJpaRepositories(basePackages = "org.baeldung.persistence.dao")
 public class PersistenceJPAConfig {

persistence-modules/spring-jpa/src/main/java/org/baeldung/persistence/multiple/model/user/Possession.java

@@ -11,7 +11,7 @@ import javax.persistence.Table;
 public class Possession {
 
     @Id
-    @GeneratedValue(strategy = GenerationType.AUTO)
+    @GeneratedValue(strategy = GenerationType.IDENTITY)
     private long id;
 
     private String name;

persistence-modules/spring-jpa/src/main/java/org/baeldung/persistence/multiple/model/user/User.java

@@ -15,7 +15,7 @@ import javax.persistence.Table;
 public class User {
 
     @Id
-    @GeneratedValue(strategy = GenerationType.AUTO)
+    @GeneratedValue(strategy = GenerationType.IDENTITY)
     private int id;
 
     private String name;

persistence-modules/spring-jpa/src/main/resources/persistence-h2.properties

@@ -2,7 +2,7 @@
 jdbc.driverClassName=org.h2.Driver
 jdbc.url=jdbc:h2:mem:db;DB_CLOSE_DELAY=-1
 jdbc.user=sa
-# jdbc.pass=
+jdbc.pass=
 
 # hibernate.X
 hibernate.dialect=org.hibernate.dialect.H2Dialect

persistence-modules/spring-jpa/src/main/resources/persistence-multiple-db.properties

@@ -1,12 +1,12 @@
 # jdbc.X
-jdbc.driverClassName=com.mysql.cj.jdbc.Driver
-user.jdbc.url=jdbc:mysql://localhost:3306/spring_jpa_user?createDatabaseIfNotExist=true
-product.jdbc.url=jdbc:mysql://localhost:3306/spring_jpa_product?createDatabaseIfNotExist=true
-jdbc.user=tutorialuser
-jdbc.pass=tutorialmy5ql
+jdbc.driverClassName=org.h2.Driver
+user.jdbc.url=jdbc:h2:mem:spring_jpa_user;DB_CLOSE_DELAY=-1;INIT=CREATE SCHEMA IF NOT EXISTS SPRING_JPA_USER
+product.jdbc.url=jdbc:h2:mem:spring_jpa_product;DB_CLOSE_DELAY=-1;INIT=CREATE SCHEMA IF NOT EXISTS SPRING_JPA_PRODUCT
+jdbc.user=sa
+jdbc.pass=
 
 # hibernate.X
-hibernate.dialect=org.hibernate.dialect.MySQL5Dialect
+hibernate.dialect=org.hibernate.dialect.H2Dialect
 hibernate.show_sql=false
 hibernate.hbm2ddl.auto=create-drop
 hibernate.cache.use_second_level_cache=false

persistence-modules/spring-jpa/src/main/resources/persistence-student-h2.properties

@@ -2,7 +2,7 @@
 jdbc.driverClassName=org.h2.Driver
 jdbc.url=jdbc:h2:mem:db;DB_CLOSE_DELAY=-1
 jdbc.user=sa
-# jdbc.pass=
+jdbc.pass=
 
 # hibernate.X
 hibernate.dialect=org.hibernate.dialect.H2Dialect

persistence-modules/spring-jpa/src/main/resources/persistence.xml

@@ -7,7 +7,7 @@
       http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-4.2.xsd"
 >
 
-    <context:property-placeholder location="classpath:persistence-mysql.properties"/>
+    <context:property-placeholder location="classpath:persistence-h2.properties"/>
 
     <bean id="myEmf" class="org.springframework.orm.jpa.LocalContainerEntityManagerFactoryBean">
         <property name="dataSource" ref="dataSource"/>

persistence-modules/spring-jpa/src/test/java/org/baeldung/dsrouting/DataSourceRoutingIntegrationTest.java

@@ -9,11 +9,13 @@ import org.junit.Test;
 import org.junit.runner.RunWith;
 import org.springframework.beans.factory.annotation.Autowired;
 import org.springframework.jdbc.core.JdbcTemplate;
+import org.springframework.test.annotation.DirtiesContext;
 import org.springframework.test.context.ContextConfiguration;
 import org.springframework.test.context.junit4.SpringRunner;
 
 @RunWith(SpringRunner.class)
 @ContextConfiguration(classes = DataSourceRoutingTestConfiguration.class)
+@DirtiesContext
 public class DataSourceRoutingIntegrationTest {
 
     @Autowired

persistence-modules/spring-jpa/src/test/java/org/baeldung/persistence/deletion/config/PersistenceJPAConfigDeletion.java

@@ -10,6 +10,6 @@ public class PersistenceJPAConfigDeletion extends PersistenceJPAConfigL2Cache {
 
     @Override
     protected String[] getPackagesToScan() {
-        return new String[] { "org.baeldung.persistence.deletion.model" };
+        return new String[] { "org.baeldung.persistence.deletion.model", "org.baeldung.persistence.model" };
     }
 }

persistence-modules/spring-jpa/src/test/java/org/baeldung/persistence/repository/AdvancedTaggingIntegrationTest.java

@@ -11,6 +11,7 @@ import org.baeldung.inmemory.persistence.model.SkillTag;
 import org.baeldung.inmemory.persistence.model.Student;
 import org.junit.Test;
 import org.junit.runner.RunWith;
+import org.springframework.test.annotation.DirtiesContext;
 import org.springframework.test.context.ContextConfiguration;
 import org.springframework.test.context.junit4.SpringJUnit4ClassRunner;
 import org.springframework.test.context.support.AnnotationConfigContextLoader;
@@ -26,6 +27,7 @@ import static org.junit.Assert.assertEquals;
 @RunWith(SpringJUnit4ClassRunner.class)
 @ContextConfiguration(classes = { StudentJpaConfig.class }, loader = AnnotationConfigContextLoader.class)
 @Transactional
+@DirtiesContext
 public class AdvancedTaggingIntegrationTest {
     @Resource
     private StudentRepository studentRepository;

persistence-modules/spring-jpa/src/test/java/org/baeldung/persistence/repository/ExtendedStudentRepositoryIntegrationTest.java

@@ -12,11 +12,13 @@ import org.baeldung.inmemory.persistence.model.Student;
 import org.junit.Before;
 import org.junit.Test;
 import org.junit.runner.RunWith;
+import org.springframework.test.annotation.DirtiesContext;
 import org.springframework.test.context.ContextConfiguration;
 import org.springframework.test.context.junit4.SpringJUnit4ClassRunner;
 
 @RunWith(SpringJUnit4ClassRunner.class)
 @ContextConfiguration(classes = { StudentJPAH2Config.class })
+@DirtiesContext
 public class ExtendedStudentRepositoryIntegrationTest {
     @Resource
     private ExtendedStudentRepository extendedStudentRepository;

persistence-modules/spring-jpa/src/test/java/org/baeldung/persistence/repository/InMemoryDBIntegrationTest.java

@@ -5,6 +5,7 @@ import org.baeldung.inmemory.persistence.dao.StudentRepository;
 import org.baeldung.inmemory.persistence.model.Student;
 import org.junit.Test;
 import org.junit.runner.RunWith;
+import org.springframework.test.annotation.DirtiesContext;
 import org.springframework.test.context.ContextConfiguration;
 import org.springframework.test.context.junit4.SpringJUnit4ClassRunner;
 import org.springframework.test.context.support.AnnotationConfigContextLoader;
@@ -20,6 +21,7 @@ import static org.junit.Assert.assertEquals;
 @RunWith(SpringJUnit4ClassRunner.class)
 @ContextConfiguration(classes = { StudentJpaConfig.class }, loader = AnnotationConfigContextLoader.class)
 @Transactional
+@DirtiesContext
 public class InMemoryDBIntegrationTest {
 
     @Resource

persistence-modules/spring-jpa/src/test/java/org/baeldung/persistence/repository/UserRepositoryIntegrationTest.java

@@ -11,6 +11,7 @@ import org.springframework.data.domain.PageRequest;
 import org.springframework.data.domain.Sort;
 import org.springframework.data.jpa.domain.JpaSort;
 import org.springframework.data.mapping.PropertyReferenceException;
+import org.springframework.test.annotation.DirtiesContext;
 import org.springframework.test.context.ContextConfiguration;
 import org.springframework.test.context.junit4.SpringRunner;
 import org.springframework.transaction.annotation.Transactional;
@@ -25,6 +26,7 @@ import static org.assertj.core.api.Assertions.assertThat;
  */
 @RunWith(SpringRunner.class)
 @ContextConfiguration(classes = PersistenceJPAConfigL2Cache.class)
+@DirtiesContext
 public class UserRepositoryIntegrationTest {
 
     private final String USER_NAME_ADAM = "Adam";

persistence-modules/spring-jpa/src/test/java/org/baeldung/persistence/service/DeletionIntegrationTest.java

@@ -8,6 +8,7 @@ import org.junit.Before;
 import org.junit.Test;
 import org.junit.runner.RunWith;
 import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.test.annotation.DirtiesContext;
 import org.springframework.test.context.ContextConfiguration;
 import org.springframework.test.context.junit4.SpringJUnit4ClassRunner;
 import org.springframework.test.context.support.AnnotationConfigContextLoader;
@@ -23,6 +24,7 @@ import static org.junit.Assert.assertThat;
 
 @RunWith(SpringJUnit4ClassRunner.class)
 @ContextConfiguration(classes = { PersistenceJPAConfigDeletion.class }, loader = AnnotationConfigContextLoader.class)
+@DirtiesContext
 public class DeletionIntegrationTest {
 
     @PersistenceContext