Merge pull request #4 from eugenp/master

updated master

.gitignore

@@ -48,3 +48,12 @@ dependency-reduced-pom.xml
 *.so
 *.dylib
 *.dll
+
+xml/src/test/resources/example_dom4j_new.xml
+xml/src/test/resources/example_dom4j_updated.xml
+xml/src/test/resources/example_jaxb_new.xml
+core-java-io/hard_link.txt
+core-java-io/target_link.txt
+core-java/src/main/java/com/baeldung/manifest/MANIFEST.MF
+ethereum/logs/
+jmeter/src/main/resources/*-JMeter.csv

README.md

@@ -19,7 +19,7 @@ In additional to Spring, the following technologies are in focus: `core Java`, `
 
 Building the project
 ====================
-To do the full build, do: `mvn install -Dgib.enabled=false`
+To do the full build, do: `mvn install -Pdefault -Dgib.enabled=false`
 
 
 Working with the code in Eclipse

apache-meecrowave/README.md

@@ -0,0 +1,3 @@
+### Relevant Articles: 
+================================
+- [Building a Microservice with Apache Meecrowave](http://www.baeldung.com/apache-meecrowave)

core-java-8/README.md

@@ -46,7 +46,6 @@
 - [Overview of Java Built-in Annotations](http://www.baeldung.com/java-default-annotations)
 - [Finding Min/Max in an Array with Java](http://www.baeldung.com/java-array-min-max)
 - [Internationalization and Localization in Java 8](http://www.baeldung.com/java-8-localization)
-- [Filtering Kotlin Collections](http://www.baeldung.com/kotlin-filter-collection)
 - [How to Find an Element in a List with Java](http://www.baeldung.com/find-list-element-java)
 - [Measure Elapsed Time in Java](http://www.baeldung.com/java-measure-elapsed-time)
 - [Java Optional – orElse() vs orElseGet()](http://www.baeldung.com/java-optional-or-else-vs-or-else-get)
@@ -55,3 +54,5 @@
 - [Java 8 Unsigned Arithmetic Support](http://www.baeldung.com/java-unsigned-arithmetic)
 - [How to Get the Start and the End of a Day using Java](http://www.baeldung.com/java-day-start-end)
 - [Generalized Target-Type Inference in Java](http://www.baeldung.com/java-generalized-target-type-inference)
+- [Image to Base64 String Conversion](http://www.baeldung.com/java-base64-image-string)
+- [Calculate Age in Java](http://www.baeldung.com/java-get-age)

core-java-8/pom.xml

@@ -99,6 +99,16 @@
             <artifactId>joda-time</artifactId>
             <version>${joda.version}</version>
         </dependency>
+        <dependency>
+            <groupId>org.aspectj</groupId>
+            <artifactId>aspectjrt</artifactId>
+            <version>${asspectj.version}</version>
+        </dependency>
+        <dependency>
+            <groupId>org.aspectj</groupId>
+            <artifactId>aspectjweaver</artifactId>
+            <version>${asspectj.version}</version>
+        </dependency>
     </dependencies>
 
     <build>
@@ -170,6 +180,7 @@
         <joda.version>2.10</joda.version>
         <!-- testing -->
         <assertj.version>3.6.1</assertj.version>
+        <asspectj.version>1.8.9</asspectj.version>
         <avaitility.version>1.7.0</avaitility.version>
         <jmh-core.version>1.19</jmh-core.version>
         <jmh-generator.version>1.19</jmh-generator.version>

core-java-8/src/main/java/com/baeldung/aspect/ChangeCallsToCurrentTimeInMillisMethod.aj

@@ -0,0 +1,9 @@
+package com.baeldung.aspect;
+
+public aspect ChangeCallsToCurrentTimeInMillisMethod {
+    long around():
+            call(public static native long java.lang.System.currentTimeMillis())
+                    && within(user.code.base.pckg.*) {
+        return 0;
+    }
+}

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

@@ -0,0 +1,87 @@
+package com.baeldung.list;
+
+import org.junit.Assert;
+import org.junit.Before;
+import org.junit.Test;
+
+import java.util.*;
+
+import static org.junit.Assert.*;
+
+public class AddElementsUnitTest {
+
+    List<Flower> flowers;
+
+    @Before
+    public void init() {
+        this.flowers = new ArrayList<>(Arrays.asList(
+                new Flower("Poppy", 12),
+                new Flower("Anemone", 8),
+                new Flower("Catmint", 12)));
+    }
+
+    @Test
+    public void givenAList_whenTargetListIsEmpty_thenReturnTargetListWithNewItems() {
+        List<Flower> anotherList = new ArrayList<>();
+        anotherList.addAll(flowers);
+
+        assertEquals(anotherList.size(), flowers.size());
+        Assert.assertTrue(anotherList.containsAll(flowers));
+    }
+
+    @Test
+    public void givenAList_whenTargetListIsEmpty_thenReturnTargetListWithOneModifiedElementByConstructor() {
+        List<Flower> anotherList = new ArrayList<>();
+        anotherList.addAll(flowers);
+
+        Flower flower = anotherList.get(0);
+        flower.setPetals(flowers.get(0).getPetals() * 3);
+
+        assertEquals(anotherList.size(), flowers.size());
+        Assert.assertTrue(anotherList.containsAll(flowers));
+    }
+
+    @Test
+    public void givenAListAndElements_whenUseCollectionsAddAll_thenAddElementsToTargetList() {
+        List<Flower> target = new ArrayList<>();
+
+        Collections.addAll(target, flowers.get(0), flowers.get(1), flowers.get(2), flowers.get(0));
+
+        assertEquals(target.size(), 4);
+    }
+
+    @Test
+    public void givenTwoList_whenSourceListDoesNotHaveNullElements_thenAddElementsToTargetListSkipFirstElementByStreamProcess() {
+        List<Flower> flowerVase = new ArrayList<>();
+
+        flowers.stream()
+                .skip(1)
+                .forEachOrdered(flowerVase::add);
+
+        assertEquals(flowerVase.size() + 1, flowers.size());
+        assertFalse(flowerVase.containsAll(flowers));
+    }
+
+    @Test
+    public void givenTwoList_whenSourceListDoesNotHaveNullElements_thenAddElementsToTargetListFilteringElementsByStreamProcess() {
+        List<Flower> flowerVase = new ArrayList<>();
+
+        flowers.stream()
+                .filter(f -> f.getPetals() > 10)
+                .forEachOrdered(flowerVase::add);
+
+        assertEquals(flowerVase.size() + 1, flowers.size());
+        assertFalse(flowerVase.containsAll(flowers));
+    }
+
+    @Test
+    public void givenAList_whenListIsNotNull_thenAddElementsToListByStreamProcessWihtOptional() {
+        List<Flower> target = new ArrayList<>();
+
+        Optional.ofNullable(flowers)
+                .ifPresent(target::addAll);
+
+        assertNotNull(target);
+        assertEquals(target.size(), 3);
+    }
+}

core-java-8/src/test/java/com/baeldung/util/CurrentDateTimeUnitTest.java

@@ -1,6 +1,7 @@
 package com.baeldung.util;
 
 import static org.junit.Assert.assertEquals;
+import static org.junit.Assert.assertTrue;
 
 import java.time.Clock;
 import java.time.Instant;
@@ -9,6 +10,8 @@ import java.time.LocalTime;
 import java.time.ZoneId;
 import java.time.temporal.ChronoField;
 
+import org.joda.time.DateTime;
+import org.joda.time.DateTimeUtils;
 import org.junit.Test;
 
 public class CurrentDateTimeUnitTest {
@@ -39,5 +42,4 @@ public class CurrentDateTimeUnitTest {
 
         assertEquals(clock.instant().getEpochSecond(), now.getEpochSecond());
     }
-
 }

core-java-9/pom.xml

@@ -19,11 +19,23 @@
             <version>${awaitility.version}</version>
             <scope>test</scope>
         </dependency>
+        <dependency>
+            <groupId>org.assertj</groupId>
+            <artifactId>assertj-core</artifactId>
+            <version>${assertj.version}</version>
+            <scope>test</scope>
+        </dependency>
         <dependency>
             <groupId>com.google.guava</groupId>
             <artifactId>guava</artifactId>
             <version>${guava.version}</version>
         </dependency>
+        <dependency>
+            <groupId>org.junit.platform</groupId>
+            <artifactId>junit-platform-runner</artifactId>
+            <version>${junit.platform.version}</version>
+            <scope>test</scope>
+        </dependency>
     </dependencies>
 
     <build>
@@ -50,6 +62,8 @@
 
     <properties>
         <!-- testing -->
+        <assertj.version>3.10.0</assertj.version>
+        <junit.platform.version>1.2.0</junit.platform.version>
         <awaitility.version>1.7.0</awaitility.version>
         <maven.compiler.source>1.9</maven.compiler.source>
         <maven.compiler.target>1.9</maven.compiler.target>

core-java-9/src/main/java/com/baeldung/java9/language/stream/StreamsGroupingCollectionFilter.java

@@ -0,0 +1,27 @@
+package com.baeldung.java9.language.stream;
+
+import static java.util.stream.Collectors.filtering;
+import static java.util.stream.Collectors.groupingBy;
+import static java.util.stream.Collectors.toList;
+
+import java.util.Collection;
+import java.util.List;
+import java.util.Map;
+import java.util.function.Function;
+
+public class StreamsGroupingCollectionFilter {
+
+    static public Map<Integer, List<Integer>> findEvenNumbersAfterGroupingByQuantityOfDigits(Collection<Integer> baseCollection) {
+        Function<Integer, Integer> getQuantityOfDigits = item -> (int) Math.log10(item) + 1;
+
+        return baseCollection.stream()
+            .collect(groupingBy(getQuantityOfDigits, filtering(item -> item % 2 == 0, toList())));
+    }
+
+    static public Map<Integer, List<Integer>> findEvenNumbersBeforeGroupingByQuantityOfDigits(Collection<Integer> baseCollection) {
+
+        return baseCollection.stream()
+            .filter(item -> item % 2 == 0)
+            .collect(groupingBy(item -> (int) Math.log10(item) + 1, toList()));
+    }
+}

core-java-9/src/main/java/com/baeldung/java9/maps/initialize/MapsInitializer.java

@@ -0,0 +1,33 @@
+package com.baeldung.java9.maps.initialize;
+
+import java.util.AbstractMap;
+import java.util.HashMap;
+import java.util.Map;
+
+public class MapsInitializer {
+
+    @SuppressWarnings("unused")
+    public void createMapWithMapOf() {
+        Map<String, String> emptyMap = Map.of();
+        Map<String, String> singletonMap = Map.of("key1", "value");
+        Map<String, String> map = Map.of("key1","value1", "key2", "value2");
+    }
+    
+    public void createMapWithMapEntries() {
+        Map<String, String> map = Map.ofEntries(
+            new AbstractMap.SimpleEntry<String, String>("name", "John"),
+            new AbstractMap.SimpleEntry<String, String>("city", "budapest"),
+            new AbstractMap.SimpleEntry<String, String>("zip", "000000"),
+            new AbstractMap.SimpleEntry<String, String>("home", "1231231231")
+            );
+    }
+    
+    @SuppressWarnings("unused")
+    public void createMutableMaps() {
+        Map<String, String> map = new HashMap<String, String> (Map.of("key1","value1", "key2", "value2"));
+        Map<String, String> map2 = new HashMap<String, String> ( Map.ofEntries(
+            new AbstractMap.SimpleEntry<String, String>("name", "John"),
+            new AbstractMap.SimpleEntry<String, String>("city", "budapest")));
+        
+    }
+}

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

@@ -0,0 +1,51 @@
+package com.baeldung.java9.language.stream;
+
+import static org.assertj.core.api.Assertions.assertThat;
+
+import java.util.Arrays;
+import java.util.Collection;
+import java.util.Collections;
+import java.util.HashMap;
+import java.util.List;
+import java.util.Map;
+
+import org.junit.jupiter.api.Test;
+import org.junit.platform.runner.JUnitPlatform;
+import org.junit.runner.RunWith;
+
+@RunWith(JUnitPlatform.class)
+public class CollectionFilterUnitTest {
+
+    private static final Collection<Integer> BASE_INTEGER_COLLECTION = Arrays.asList(9, 12, 55, 56, 101, 115, 8002, 223, 2668, 19, 8);
+    private static final Map<Integer, List<Integer>> EXPECTED_EVEN_FILTERED_AFTER_GROUPING_MAP = createExpectedFilterAfterGroupingMap();
+    private static Map<Integer, List<Integer>> createExpectedFilterAfterGroupingMap() {
+        Map<Integer, List<Integer>> map = new HashMap<>();
+        map.put(1, Arrays.asList(8));
+        map.put(2, Arrays.asList(12, 56));
+        map.put(3, Collections.emptyList());
+        map.put(4, Arrays.asList(8002, 2668));
+        return map;
+
+    }
+
+    private static final Map<Integer, List<Integer>> EXPECTED_EVEN_FILTERED_BEFORE_GROUPING_MAP = createExpectedFilterBeforeGroupingMap();
+    private static Map<Integer, List<Integer>> createExpectedFilterBeforeGroupingMap() {
+        Map<Integer, List<Integer>> map = new HashMap<>();
+        map.put(1, Arrays.asList(8));
+        map.put(2, Arrays.asList(12, 56));
+        map.put(4, Arrays.asList(8002, 2668));
+        return map;
+
+    }
+
+    @Test
+    public void givenAStringCollection_whenFilteringFourLetterWords_thenObtainTheFilteredCollection() {
+        Map<Integer, List<Integer>> filteredAfterGroupingMap = StreamsGroupingCollectionFilter.findEvenNumbersAfterGroupingByQuantityOfDigits(BASE_INTEGER_COLLECTION);
+        Map<Integer, List<Integer>> filteredBeforeGroupingMap = StreamsGroupingCollectionFilter.findEvenNumbersBeforeGroupingByQuantityOfDigits(BASE_INTEGER_COLLECTION);
+
+        assertThat(filteredAfterGroupingMap).containsAllEntriesOf(EXPECTED_EVEN_FILTERED_AFTER_GROUPING_MAP);
+        assertThat(filteredBeforeGroupingMap).doesNotContainKey(3)
+            .containsAllEntriesOf(EXPECTED_EVEN_FILTERED_BEFORE_GROUPING_MAP);
+    }
+
+}

core-java-collections/README.md

@@ -30,3 +30,4 @@
 - [How to TDD a List Implementation in Java](http://www.baeldung.com/java-test-driven-list)
 - [How to Store Duplicate Keys in a Map in Java?](http://www.baeldung.com/java-map-duplicate-keys)
 - [Getting the Size of an Iterable in Java](http://www.baeldung.com/java-iterable-size)
+- [Iterating Backward Through a List](http://www.baeldung.com/java-list-iterate-backwards)

core-java-collections/pom.xml

@@ -36,19 +36,37 @@
             <artifactId>commons-lang3</artifactId>
             <version>${commons-lang3.version}</version>
         </dependency>
+        <dependency>
+            <groupId>org.eclipse.collections</groupId>
+            <artifactId>eclipse-collections-api</artifactId>
+            <version>${eclipse.collections.version}</version>
+        </dependency>
+        <dependency>
+            <groupId>org.eclipse.collections</groupId>
+            <artifactId>eclipse-collections</artifactId>
+            <version>${eclipse.collections.version}</version>
+        </dependency>
         <dependency>
             <groupId>org.assertj</groupId>
             <artifactId>assertj-core</artifactId>
             <version>${assertj.version}</version>
             <scope>test</scope>
         </dependency>
+        <dependency>
+            <groupId>org.junit.platform</groupId>
+            <artifactId>junit-platform-runner</artifactId>
+            <version>${junit.platform.version}</version>
+            <scope>test</scope>
+        </dependency>
     </dependencies>
 
     <properties>
+        <junit.platform.version>1.2.0</junit.platform.version>
         <commons-lang3.version>3.5</commons-lang3.version>
         <commons-collections4.version>4.1</commons-collections4.version>
         <collections-generic.version>4.01</collections-generic.version>
         <avaitility.version>1.7.0</avaitility.version>
         <assertj.version>3.6.1</assertj.version>
+        <eclipse.collections.version>9.2.0</eclipse.collections.version>
     </properties>
 </project>

core-java-collections/src/main/java/com/baeldung/convertlisttomap/ConvertListToMapService.java

@@ -1,18 +1,19 @@
 package com.baeldung.convertlisttomap;
 
+import com.google.common.collect.Maps;
+import org.apache.commons.collections4.MapUtils;
+
 import java.util.HashMap;
 import java.util.List;
 import java.util.Map;
 import java.util.stream.Collectors;
 
-import org.apache.commons.collections4.IterableUtils;
-import org.apache.commons.collections4.MapUtils;
-import com.google.common.collect.Maps;
-
 public class ConvertListToMapService {
 
     public Map<Integer, Animal> convertListBeforeJava8(List<Animal> list) {
-        Map<Integer, Animal> map = new HashMap<Integer, Animal>();
+
+        Map<Integer, Animal> map = new HashMap<>();
+
         for (Animal animal : list) {
             map.put(animal.getId(), animal);
         }
@@ -30,20 +31,9 @@ public class ConvertListToMapService {
         return map;
     }
 
-    public Map<Integer, Animal> convertListWithApacheCommons1(List<Animal> list) {
+    public Map<Integer, Animal> convertListWithApacheCommons(List<Animal> list) {
 
-        Map<Integer, Animal> map = new HashMap<Integer, Animal>();
-
-        IterableUtils.forEach(list, animal -> {
-            map.put(animal.getId(), animal);
-        });
-
-        return map;
-    }
-
-    public Map<Integer, Animal> convertListWithApacheCommons2(List<Animal> list) {
-
-        Map<Integer, Animal> map = new HashMap<Integer, Animal>();
+        Map<Integer, Animal> map = new HashMap<>();
 
         MapUtils.populateMap(map, list, Animal::getId);
 

core-java-collections/src/main/java/com/baeldung/java/filtering/CollectionUtilsCollectionFilter.java

@@ -0,0 +1,16 @@
+package com.baeldung.java.filtering;
+
+import java.util.Collection;
+
+import org.apache.commons.collections4.CollectionUtils;
+import org.apache.commons.collections4.Predicate;
+
+public class CollectionUtilsCollectionFilter {
+
+    static public Collection<Integer> findEvenNumbers(Collection<Integer> baseCollection) {
+        Predicate<Integer> apacheEventNumberPredicate = item -> item % 2 == 0;
+
+        CollectionUtils.filter(baseCollection, apacheEventNumberPredicate);
+        return baseCollection;
+    }
+}

core-java-collections/src/main/java/com/baeldung/java/filtering/EclipseCollectionsCollectionFilter.java

@@ -0,0 +1,32 @@
+package com.baeldung.java.filtering;
+
+import java.util.Collection;
+
+import org.eclipse.collections.api.block.predicate.Predicate;
+import org.eclipse.collections.impl.factory.Lists;
+import org.eclipse.collections.impl.utility.Iterate;
+
+public class EclipseCollectionsCollectionFilter {
+
+    static public Collection<Integer> findEvenNumbers(Collection<Integer> baseCollection) {
+        Predicate<Integer> eclipsePredicate = item -> item % 2 == 0;
+        Collection<Integer> filteredList = Lists.mutable.ofAll(baseCollection)
+            .select(eclipsePredicate);
+
+        return filteredList;
+    }
+
+    static public Collection<Integer> findEvenNumbersUsingIterate(Collection<Integer> baseCollection) {
+        Predicate<Integer> eclipsePredicate = new Predicate<Integer>() {
+            private static final long serialVersionUID = 1L;
+
+            @Override
+            public boolean accept(Integer arg0) {
+                return arg0 % 2 == 0;
+            }
+        };
+        Collection<Integer> filteredList = Iterate.select(baseCollection, eclipsePredicate);
+
+        return filteredList;
+    }
+}

core-java-collections/src/main/java/com/baeldung/java/filtering/GuavaCollectionFilter.java

@@ -0,0 +1,17 @@
+package com.baeldung.java.filtering;
+
+import java.util.Collection;
+
+import com.google.common.base.Predicate;
+import com.google.common.collect.Collections2;
+
+public class GuavaCollectionFilter {
+
+    static public Collection<Integer> findEvenNumbers(Collection<Integer> baseCollection) {
+        Predicate<Integer> guavaPredicate = item -> item % 2 == 0;
+
+        Collection<Integer> filteredCollection = Collections2.filter(baseCollection, guavaPredicate);
+        return filteredCollection;
+    }
+
+}

core-java-collections/src/main/java/com/baeldung/java/filtering/StreamsCollectionFilter.java

@@ -0,0 +1,26 @@
+package com.baeldung.java.filtering;
+
+import java.util.Collection;
+import java.util.function.Predicate;
+import java.util.stream.Collectors;
+
+public class StreamsCollectionFilter {
+
+    public static <T> Collection<T> filterCollectionHelperMethod(Collection<T> baseCollection, Predicate<T> predicate) {
+        return baseCollection.stream()
+            .filter(predicate)
+            .collect(Collectors.toList());
+    }
+
+    static public Collection<Integer> findEvenNumbersUsingHelperMethod(Collection<Integer> baseCollection) {
+        return filterCollectionHelperMethod(baseCollection, item -> item % 2 == 0);
+    }
+
+    static public Collection<Integer> findEvenNumbers(Collection<Integer> baseCollection) {
+        Predicate<Integer> streamsPredicate = item -> item % 2 == 0;
+
+        return baseCollection.stream()
+            .filter(streamsPredicate)
+            .collect(Collectors.toList());
+    }
+}

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

@@ -0,0 +1,28 @@
+package com.baeldung.java.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-collections/src/main/java/com/baeldung/java/map/initialize/MapInitializer.java

@@ -0,0 +1,80 @@
+package com.baeldung.java.map.initialize;
+
+import java.util.AbstractMap;
+import java.util.Collections;
+import java.util.HashMap;
+import java.util.Map;
+import java.util.stream.Collectors;
+import java.util.stream.Stream;
+
+public class MapInitializer {
+
+    public static Map<String, String> articleMapOne;
+    static {
+        articleMapOne = new HashMap<>();
+        articleMapOne.put("ar01", "Intro to Map");
+        articleMapOne.put("ar02", "Some article");
+    }
+
+    public static Map<String, String> createSingletonMap() {
+        Map<String, String> passwordMap = Collections.singletonMap("username1", "password1");
+        return passwordMap;
+
+    }
+
+    public Map<String, String> createEmptyMap() {
+        Map<String, String> emptyMap = Collections.emptyMap();
+        return emptyMap;
+    }
+
+    public Map<String, String> createUsingDoubleBrace() {
+        Map<String, String> doubleBraceMap = new HashMap<String, String>() {
+
+            /**
+             * 
+             */
+            private static final long serialVersionUID = 1L;
+
+            {
+                put("key1", "value1");
+                put("key2", "value2");
+            }
+        };
+        return doubleBraceMap;
+    }
+
+    public Map<String, String> createMapUsingStreamStringArray() {
+        Map<String, String> map = Stream.of(new String[][] { { "Hello", "World" }, { "John", "Doe" }, })
+            .collect(Collectors.toMap(data -> data[0], data -> data[1]));
+
+        return map;
+    }
+
+    public Map<String, Integer> createMapUsingStreamObjectArray() {
+        Map<String, Integer> map = Stream.of(new Object[][] { { "data1", 1 }, { "data2", 2 }, })
+            .collect(Collectors.toMap(data -> (String) data[0], data -> (Integer) data[1]));
+
+        return map;
+    }
+
+    public Map<String, Integer> createMapUsingStreamSimpleEntry() {
+        Map<String, Integer> map = Stream.of(new AbstractMap.SimpleEntry<>("idea", 1), new AbstractMap.SimpleEntry<>("mobile", 2))
+            .collect(Collectors.toMap(Map.Entry::getKey, Map.Entry::getValue));
+
+        return map;
+    }
+
+    public Map<String, Integer> createMapUsingStreamSimpleImmutableEntry() {
+        Map<String, Integer> map = Stream.of(new AbstractMap.SimpleImmutableEntry<>("idea", 1), new AbstractMap.SimpleImmutableEntry<>("mobile", 2))
+            .collect(Collectors.toMap(Map.Entry::getKey, Map.Entry::getValue));
+
+        return map;
+    }
+
+    public Map<String, String> createImmutableMapWithStreams() {
+        Map<String, String> map = Stream.of(new String[][] { { "Hello", "World" }, { "John", "Doe" }, })
+            .collect(Collectors.collectingAndThen(Collectors.toMap(data -> data[0], data -> data[1]), Collections::<String, String> unmodifiableMap));
+        return map;
+
+    }
+}

core-java-collections/src/test/java/com/baeldung/convertlisttomap/ConvertListToMapServiceUnitTest.java

@@ -1,13 +1,14 @@
 package com.baeldung.convertlisttomap;
 
-import static org.hamcrest.MatcherAssert.assertThat;
-import static org.hamcrest.Matchers.*;
+import org.junit.Before;
+import org.junit.Test;
+
 import java.util.ArrayList;
 import java.util.List;
 import java.util.Map;
 
-import org.junit.Before;
-import org.junit.Test;
+import static org.hamcrest.MatcherAssert.assertThat;
+import static org.hamcrest.Matchers.containsInAnyOrder;
 
 public class ConvertListToMapServiceUnitTest {
     List<Animal> list;
@@ -29,6 +30,7 @@ public class ConvertListToMapServiceUnitTest {
         list.add(cow);
         Animal goat = new Animal(5, "Goat");
         list.add(goat);
+
     }
 
     @Test
@@ -56,18 +58,11 @@ public class ConvertListToMapServiceUnitTest {
     }
 
     @Test
-    public void givenAList_whenConvertWithApacheCommons1_thenReturnMapWithTheSameElements() {
+    public void givenAList_whenConvertWithApacheCommons_thenReturnMapWithTheSameElements() {
 
-        Map<Integer, Animal> map = convertListService.convertListWithApacheCommons1(list);
+        Map<Integer, Animal> map = convertListService.convertListWithApacheCommons(list);
 
         assertThat(map.values(), containsInAnyOrder(list.toArray()));
     }
 
-    @Test
-    public void givenAList_whenConvertWithApacheCommons2_thenReturnMapWithTheSameElements() {
-
-        Map<Integer, Animal> map = convertListService.convertListWithApacheCommons2(list);
-
-        assertThat(map.values(), containsInAnyOrder(list.toArray()));
-    }
 }

core-java-collections/src/test/java/com/baeldung/convertlisttomap/ConvertListWithDiplicatedIdToMapServiceUnitTest.java

@@ -0,0 +1,68 @@
+package com.baeldung.convertlisttomap;
+
+import org.junit.Before;
+import org.junit.Test;
+
+import java.util.ArrayList;
+import java.util.List;
+import java.util.Map;
+
+import static org.hamcrest.MatcherAssert.assertThat;
+import static org.hamcrest.Matchers.hasItem;
+import static org.hamcrest.Matchers.hasSize;
+
+public class ConvertListWithDiplicatedIdToMapServiceUnitTest {
+    List<Animal> duplicatedIdList;
+
+    private ConvertListToMapService convertListService = new ConvertListToMapService();
+
+    @Before
+    public void init() {
+
+        this.duplicatedIdList = new ArrayList<>();
+
+        Animal cat = new Animal(1, "Cat");
+        duplicatedIdList.add(cat);
+        Animal dog = new Animal(2, "Dog");
+        duplicatedIdList.add(dog);
+        Animal pig = new Animal(3, "Pig");
+        duplicatedIdList.add(pig);
+        Animal cow = new Animal(4, "Cow");
+        duplicatedIdList.add(cow);
+        Animal goat = new Animal(4, "Goat");
+        duplicatedIdList.add(goat);
+
+    }
+
+    @Test
+    public void givenADupIdList_whenConvertBeforeJava8_thenReturnMapWithRewrittenElement() {
+
+        Map<Integer, Animal> map = convertListService.convertListBeforeJava8(duplicatedIdList);
+
+        assertThat(map.values(), hasSize(4));
+        assertThat(map.values(), hasItem(duplicatedIdList.get(4)));
+    }
+
+    @Test
+    public void givenADupIdList_whenConvertWithApacheCommons_thenReturnMapWithRewrittenElement() {
+
+        Map<Integer, Animal> map = convertListService.convertListWithApacheCommons(duplicatedIdList);
+
+        assertThat(map.values(), hasSize(4));
+        assertThat(map.values(), hasItem(duplicatedIdList.get(4)));
+    }
+
+    @Test(expected = IllegalStateException.class)
+    public void givenADupIdList_whenConvertAfterJava8_thenException() {
+
+        convertListService.convertListAfterJava8(duplicatedIdList);
+    }
+
+    @Test(expected = IllegalArgumentException.class)
+    public void givenADupIdList_whenConvertWithGuava_thenException() {
+
+        convertListService.convertListWithGuava(duplicatedIdList);
+
+    }
+
+}

core-java-collections/src/test/java/com/baeldung/java/filtering/CollectionFiltersUnitTest.java

@@ -0,0 +1,44 @@
+package com.baeldung.java.filtering;
+
+import static org.assertj.core.api.Assertions.assertThat;
+
+import java.util.ArrayList;
+import java.util.Arrays;
+import java.util.Collection;
+
+import org.junit.jupiter.api.Test;
+import org.junit.platform.runner.JUnitPlatform;
+import org.junit.runner.RunWith;
+
+@RunWith(JUnitPlatform.class)
+public class CollectionFiltersUnitTest {
+
+    private static final Collection<Integer> BASE_INTEGER_COLLECTION = Arrays.asList(9, 14, 2, 7, 1, 5, 8);
+    private static final Collection<Integer> EXPECTED_EVEN_FILTERED_COLLECTION = Arrays.asList(14, 2, 8);
+
+    @Test
+    public void givenAStringCollection_whenFilteringFourLetterWords_thenObtainTheFilteredCollection() {
+        final Collection<String> baseStrings = Arrays.asList("java", "baeldung", "type", "example", "other");
+
+        Collection<String> filtered = StreamsCollectionFilter.filterCollectionHelperMethod(baseStrings, item -> item.length() == 4);
+
+        assertThat(filtered).containsExactlyInAnyOrder("java", "type");
+    }
+
+    @Test
+    public void givenAnIntegerCollection_whenFilteringEvenValues_thenObtainTheFilteredCollectionForAllCases() {
+        Collection<Integer> filteredWithStreams1 = StreamsCollectionFilter.findEvenNumbers(BASE_INTEGER_COLLECTION);
+        Collection<Integer> filteredWithCollectionUtils = CollectionUtilsCollectionFilter.findEvenNumbers(new ArrayList<>(BASE_INTEGER_COLLECTION));
+        Collection<Integer> filteredWithEclipseCollections = EclipseCollectionsCollectionFilter.findEvenNumbers(BASE_INTEGER_COLLECTION);
+        Collection<Integer> filteredWithEclipseCollectionsUsingIterate = EclipseCollectionsCollectionFilter.findEvenNumbersUsingIterate(BASE_INTEGER_COLLECTION);
+        Collection<Integer> filteredWithGuava = GuavaCollectionFilter.findEvenNumbers(BASE_INTEGER_COLLECTION);
+
+        assertThat(filteredWithStreams1).hasSameElementsAs(filteredWithCollectionUtils)
+            .hasSameElementsAs(filteredWithEclipseCollections)
+            .hasSameElementsAs(filteredWithEclipseCollectionsUsingIterate)
+            .hasSameElementsAs(filteredWithEclipseCollectionsUsingIterate)
+            .hasSameElementsAs(filteredWithGuava)
+            .hasSameElementsAs(EXPECTED_EVEN_FILTERED_COLLECTION);
+    }
+
+}

core-java-collections/src/test/java/com/baeldung/java/map/initialize/MapInitializerUnitTest.java

@@ -0,0 +1,27 @@
+package com.baeldung.java.map.initialize;
+
+import static org.junit.Assert.assertEquals;
+
+import java.util.Map;
+
+import org.junit.Test;
+
+public class MapInitializerUnitTest {
+    
+    @Test
+    public void givenStaticMap_whenUpdated_thenCorrect() {
+        
+        MapInitializer.articleMapOne.put("NewArticle1", "Convert array to List");
+        
+        assertEquals(MapInitializer.articleMapOne.get("NewArticle1"), "Convert array to List");
+        
+    }
+    
+    @Test(expected=UnsupportedOperationException.class)
+    public void givenSingleTonMap_whenEntriesAdded_throwsException() {
+        
+        Map<String, String> map = MapInitializer.createSingletonMap();
+        map.put("username2", "password2");
+    }
+
+}

core-java-collections/src/test/java/com/baeldung/list/listoflist/AddElementsToListUnitTest.java

@@ -0,0 +1,69 @@
+package com.baeldung.list.listoflist;
+
+import com.baeldung.java.list.Flower;
+import org.junit.Assert;
+import org.junit.Before;
+import org.junit.Test;
+import java.util.*;
+import static org.junit.Assert.*;
+
+public class AddElementsToListUnitTest {
+
+    List<Flower> flowers;
+
+    @Before
+    public void init() {
+        this.flowers = new ArrayList<>(Arrays.asList(
+                new Flower("Poppy", 12),
+                new Flower("Anemone", 8),
+                new Flower("Catmint", 12)));
+    }
+    @Test
+    public void givenAList_whenTargetListIsEmpty_thenReturnTargetListWithNewItems() {
+        List<Flower> anotherList = new ArrayList<>();
+        anotherList.addAll(flowers);
+        assertEquals(anotherList.size(), flowers.size());
+        Assert.assertTrue(anotherList.containsAll(flowers));
+    }
+    @Test
+    public void givenAList_whenTargetListIsEmpty_thenReturnTargetListWithOneModifiedElementByConstructor() {
+        List<Flower> anotherList = new ArrayList<>();
+        anotherList.addAll(flowers);
+        Flower flower = anotherList.get(0);
+        flower.setPetals(flowers.get(0).getPetals() * 3);
+        assertEquals(anotherList.size(), flowers.size());
+        Assert.assertTrue(anotherList.containsAll(flowers));
+    }
+    @Test
+    public void givenAListAndElements_whenUseCollectionsAddAll_thenAddElementsToTargetList() {
+        List<Flower> target = new ArrayList<>();
+        Collections.addAll(target, flowers.get(0), flowers.get(1), flowers.get(2), flowers.get(0));
+        assertEquals(target.size(), 4);
+    }
+    @Test
+    public void givenTwoList_whenSourceListDoesNotHaveNullElements_thenAddElementsToTargetListSkipFirstElementByStreamProcess() {
+        List<Flower> flowerVase = new ArrayList<>();
+        flowers.stream()
+                .skip(1)
+                .forEachOrdered(flowerVase::add);
+        assertEquals(flowerVase.size() + 1, flowers.size());
+        assertFalse(flowerVase.containsAll(flowers));
+    }
+    @Test
+    public void givenTwoList_whenSourceListDoesNotHaveNullElements_thenAddElementsToTargetListFilteringElementsByStreamProcess() {
+        List<Flower> flowerVase = new ArrayList<>();
+        flowers.stream()
+                .filter(f -> f.getPetals() > 10)
+                .forEachOrdered(flowerVase::add);
+        assertEquals(flowerVase.size() + 1, flowers.size());
+        assertFalse(flowerVase.containsAll(flowers));
+    }
+    @Test
+    public void givenAList_whenListIsNotNull_thenAddElementsToListByStreamProcessWihtOptional() {
+        List<Flower> target = new ArrayList<>();
+        Optional.ofNullable(flowers)
+                .ifPresent(target::addAll);
+        assertNotNull(target);
+        assertEquals(target.size(), 3);
+    }
+}

core-java-collections/src/test/java/com/baeldung/list/removefirst/RemoveFirstElementUnitTest.java

@@ -0,0 +1,51 @@
+package com.baeldung.list.removefirst;
+
+import static org.hamcrest.MatcherAssert.assertThat;
+import static org.hamcrest.Matchers.*;
+
+import java.util.ArrayList;
+import java.util.LinkedList;
+import java.util.List;
+
+import org.junit.Before;
+import org.junit.Test;
+
+public class RemoveFirstElementUnitTest {
+
+    private List<String> list = new ArrayList<>();
+    private LinkedList<String> linkedList = new LinkedList<>();
+
+    @Before
+    public void init() {
+
+        list.add("cat");
+        list.add("dog");
+        list.add("pig");
+        list.add("cow");
+        list.add("goat");
+
+        linkedList.add("cat");
+        linkedList.add("dog");
+        linkedList.add("pig");
+        linkedList.add("cow");
+        linkedList.add("goat");
+    }
+
+    @Test
+    public void givenList_whenRemoveFirst_thenRemoved() {
+        list.remove(0);
+
+        assertThat(list, hasSize(4));
+        assertThat(list, not(contains("cat")));
+    }
+
+    @Test
+    public void givenLinkedList_whenRemoveFirst_thenRemoved() {
+
+        linkedList.removeFirst();
+
+        assertThat(linkedList, hasSize(4));
+        assertThat(linkedList, not(contains("cat")));
+    }
+
+}

core-java-io/README.md

@@ -28,3 +28,5 @@
 - [Guide to Java NIO2 Asynchronous Channel APIs](http://www.baeldung.com/java-nio-2-async-channels)
 - [A Guide to NIO2 Asynchronous Socket Channel](http://www.baeldung.com/java-nio2-async-socket-channel)
 - [Download a File From an URL in Java](http://www.baeldung.com/java-download-file)
+- [Create a Symbolic Link with Java](http://www.baeldung.com/java-symlink)
+- [Quick Use of FilenameFilter](http://www.baeldung.com/java-filename-filter)

core-java-persistence/pom.xml

@@ -0,0 +1,59 @@
+<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
+    <modelVersion>4.0.0</modelVersion>
+    <groupId>com.baeldung.core-java-persistence</groupId>
+    <artifactId>core-java-persistence</artifactId>
+    <version>0.1.0-SNAPSHOT</version>
+    <packaging>jar</packaging>
+    <name>core-java-persistence</name>
+    <parent>
+        <groupId>com.baeldung</groupId>
+        <artifactId>parent-java</artifactId>
+        <version>0.0.1-SNAPSHOT</version>
+        <relativePath>../parent-java</relativePath>
+    </parent>
+    <dependencies>
+        <dependency>
+            <groupId>org.assertj</groupId>
+            <artifactId>assertj-core</artifactId>
+            <version>${assertj-core.version}</version>
+            <scope>test</scope>
+        </dependency>
+        <dependency>
+            <groupId>com.h2database</groupId>
+            <artifactId>h2</artifactId>
+            <version>${h2database.version}</version>
+        </dependency>
+        <dependency>
+            <groupId>org.apache.commons</groupId>
+            <artifactId>commons-dbcp2</artifactId>
+            <version>${commons-dbcp2.version}</version>
+        </dependency>
+        <dependency>
+            <groupId>com.zaxxer</groupId>
+            <artifactId>HikariCP</artifactId>
+            <version>${HikariCP.version}</version>
+        </dependency>
+        <dependency>
+            <groupId>com.mchange</groupId>
+            <artifactId>c3p0</artifactId>
+            <version>${c3p0.version}</version>
+        </dependency>
+    </dependencies>
+    <build>
+        <finalName>core-java-persistence</finalName>
+        <resources>
+            <resource>
+                <directory>src/main/resources</directory>
+                <filtering>true</filtering>
+            </resource>
+        </resources>
+    </build>    
+    <properties>
+        <assertj-core.version>3.10.0</assertj-core.version>
+        <h2database.version>1.4.197</h2database.version>
+        <commons-dbcp2.version>2.4.0</commons-dbcp2.version>
+        <HikariCP.version>3.2.0</HikariCP.version>
+        <c3p0.version>0.9.5.2</c3p0.version>
+    </properties>
+</project>

core-java-persistence/src/main/java/com/baeldung/connectionpool/BasicConnectionPool.java

@@ -0,0 +1,92 @@
+package com.baeldung.connectionpool;
+
+import java.sql.Connection;
+import java.sql.DriverManager;
+import java.sql.SQLException;
+import java.util.ArrayList;
+import java.util.List;
+
+public class BasicConnectionPool implements ConnectionPool {
+
+    private final String url;
+    private final String user;
+    private final String password;
+    private final List<Connection> connectionPool;
+    private final List<Connection> usedConnections = new ArrayList<>();
+    private static final int INITIAL_POOL_SIZE = 10;
+    private final int MAX_POOL_SIZE = 20;
+
+    public static BasicConnectionPool create(String url, String user, String password) throws SQLException {
+        List<Connection> pool = new ArrayList<>(INITIAL_POOL_SIZE);
+        for (int i = 0; i < INITIAL_POOL_SIZE; i++) {
+            pool.add(createConnection(url, user, password));
+        }
+        return new BasicConnectionPool(url, user, password, pool);
+    }
+
+    private BasicConnectionPool(String url, String user, String password, List<Connection> connectionPool) {
+        this.url = url;
+        this.user = user;
+        this.password = password;
+        this.connectionPool = connectionPool;
+    }
+
+    @Override
+    public Connection getConnection() throws SQLException {
+        if (connectionPool.isEmpty()) {
+            if (usedConnections.size() < MAX_POOL_SIZE) {
+                connectionPool.add(createConnection(url, user, password));
+            } else {
+                throw new RuntimeException("Maximum pool size reached, no available connections!");
+            }
+        }
+
+        Connection connection = connectionPool.remove(connectionPool.size() - 1);
+        usedConnections.add(connection);
+        return connection;
+    }
+
+    @Override
+    public boolean releaseConnection(Connection connection) {
+        connectionPool.add(connection);
+        return usedConnections.remove(connection);
+    }
+
+    private static Connection createConnection(String url, String user, String password) throws SQLException {
+        return DriverManager.getConnection(url, user, password);
+    }
+
+    @Override
+    public int getSize() {
+        return connectionPool.size() + usedConnections.size();
+    }
+
+    @Override
+    public List<Connection> getConnectionPool() {
+        return connectionPool;
+    }
+    
+    @Override
+    public String getUrl() {
+        return url;
+    }
+
+    @Override
+    public String getUser() {
+        return user;
+    }
+
+    @Override
+    public String getPassword() {
+        return password;
+    }
+    
+    @Override
+    public void shutdown() throws SQLException {
+        usedConnections.forEach(this::releaseConnection);
+        for (Connection c : connectionPool) {
+            c.close();
+        }
+        connectionPool.clear();
+    }
+}

core-java-persistence/src/main/java/com/baeldung/connectionpool/C3poDataSource.java

@@ -0,0 +1,28 @@
+package com.baeldung.connectionpool;
+
+import com.mchange.v2.c3p0.ComboPooledDataSource;
+import java.beans.PropertyVetoException;
+import java.sql.Connection;
+import java.sql.SQLException;
+
+public class C3poDataSource {
+
+    private static final ComboPooledDataSource cpds = new ComboPooledDataSource();
+
+    static {
+        try {
+            cpds.setDriverClass("org.h2.Driver");
+            cpds.setJdbcUrl("jdbc:h2:mem:test");
+            cpds.setUser("user");
+            cpds.setPassword("password");
+        } catch (PropertyVetoException e) {
+            e.printStackTrace();
+        }
+    }
+    
+    public static Connection getConnection() throws SQLException {
+        return cpds.getConnection();
+    }
+    
+    private C3poDataSource(){}
+}

core-java-persistence/src/main/java/com/baeldung/connectionpool/ConnectionPool.java

@@ -0,0 +1,24 @@
+package com.baeldung.connectionpool;
+
+import java.sql.Connection;
+import java.sql.SQLException;
+import java.util.List;
+
+public interface ConnectionPool {
+
+    Connection getConnection() throws SQLException;
+    
+    boolean releaseConnection(Connection connection);
+    
+    List<Connection> getConnectionPool();
+    
+    int getSize();
+    
+    String getUrl();
+    
+    String getUser();
+
+    String getPassword();
+    
+    void shutdown() throws SQLException;;
+}   

core-java-persistence/src/main/java/com/baeldung/connectionpool/DBCPDataSource.java

@@ -0,0 +1,25 @@
+package com.baeldung.connectionpool;
+
+import java.sql.Connection;
+import java.sql.SQLException;
+import org.apache.commons.dbcp2.BasicDataSource;
+
+public class DBCPDataSource {
+    
+    private static final BasicDataSource ds = new BasicDataSource();
+    
+    static {
+        ds.setUrl("jdbc:h2:mem:test");
+        ds.setUsername("user");
+        ds.setPassword("password");
+        ds.setMinIdle(5);
+        ds.setMaxIdle(10);
+        ds.setMaxOpenPreparedStatements(100);
+    }
+    
+    public static Connection getConnection() throws SQLException {
+        return ds.getConnection();
+    }
+    
+    private DBCPDataSource(){}
+}

core-java-persistence/src/main/java/com/baeldung/connectionpool/HikariCPDataSource.java

@@ -0,0 +1,28 @@
+package com.baeldung.connectionpool;
+
+import com.zaxxer.hikari.HikariConfig;
+import com.zaxxer.hikari.HikariDataSource;
+import java.sql.Connection;
+import java.sql.SQLException;
+
+public class HikariCPDataSource {
+    
+    private static final HikariConfig config = new HikariConfig();
+    private static final HikariDataSource ds;
+    
+    static {
+        config.setJdbcUrl("jdbc:h2:mem:test");
+        config.setUsername("user");
+        config.setPassword("password");
+        config.addDataSourceProperty("cachePrepStmts", "true");
+        config.addDataSourceProperty("prepStmtCacheSize", "250");
+        config.addDataSourceProperty("prepStmtCacheSqlLimit", "2048");
+        ds = new HikariDataSource(config);
+    }
+    
+    public static Connection getConnection() throws SQLException {
+        return ds.getConnection();
+    }
+    
+    private HikariCPDataSource(){}
+}

core-java-persistence/src/test/java/com/baeldung/connectionpool/BasicConnectionPoolUnitTest.java

@@ -0,0 +1,67 @@
+package com.baeldung.connectionpool;
+
+import java.sql.Connection;
+import java.sql.SQLException;
+
+import static org.assertj.core.api.Assertions.assertThat;
+import static org.junit.Assert.assertTrue;
+import static org.junit.Assert.fail;
+
+import org.junit.BeforeClass;
+import org.junit.Test;
+
+public class BasicConnectionPoolUnitTest {
+    
+    private static ConnectionPool connectionPool;
+
+    @BeforeClass
+    public static void setUpBasicConnectionPoolInstance() throws SQLException {
+        connectionPool = BasicConnectionPool.create("jdbc:h2:mem:test", "user", "password");
+    }
+    
+    @Test
+    public void givenBasicConnectionPoolInstance_whenCalledgetConnection_thenCorrect() throws Exception {
+        assertTrue(connectionPool.getConnection().isValid(1));
+    }
+    
+    @Test
+    public void givenBasicConnectionPoolInstance_whenCalledreleaseConnection_thenCorrect() throws Exception {
+        Connection connection = connectionPool.getConnection();
+        assertThat(connectionPool.releaseConnection(connection)).isTrue();
+    }
+    
+    @Test
+    public void givenBasicConnectionPoolInstance_whenCalledgetUrl_thenCorrect() {
+        assertThat(connectionPool.getUrl()).isEqualTo("jdbc:h2:mem:test");
+    }
+    
+    @Test
+    public void givenBasicConnectionPoolInstance_whenCalledgetUser_thenCorrect() {
+        assertThat(connectionPool.getUser()).isEqualTo("user");
+    }
+    
+    @Test
+    public void givenBasicConnectionPoolInstance_whenCalledgetPassword_thenCorrect() {
+        assertThat(connectionPool.getPassword()).isEqualTo("password");
+    }
+
+    @Test(expected = RuntimeException.class)
+    public void givenBasicConnectionPoolInstance_whenAskedForMoreThanMax_thenError() throws Exception {
+        // this test needs to be independent so it doesn't share the same connection pool as other tests
+        ConnectionPool cp = BasicConnectionPool.create("jdbc:h2:mem:test", "user", "password");
+        final int MAX_POOL_SIZE = 20;
+        for (int i = 0; i < MAX_POOL_SIZE + 1; i++) {
+            cp.getConnection();
+        }
+        fail();
+    }
+
+    @Test
+    public void givenBasicConnectionPoolInstance_whenSutdown_thenEmpty() throws Exception {
+        ConnectionPool cp = BasicConnectionPool.create("jdbc:h2:mem:test", "user", "password");
+        assertThat(((BasicConnectionPool)cp).getSize()).isEqualTo(10);
+
+        ((BasicConnectionPool) cp).shutdown();
+        assertThat(((BasicConnectionPool)cp).getSize()).isEqualTo(0);
+    }
+}

core-java-persistence/src/test/java/com/baeldung/connectionpool/C3poDataSourceUnitTest.java

@@ -0,0 +1,13 @@
+package com.baeldung.connectionpool;
+
+import java.sql.SQLException;
+import static org.junit.Assert.assertTrue;
+import org.junit.Test;
+
+public class C3poDataSourceUnitTest {
+    
+    @Test
+    public void givenC3poDataSourceClass_whenCalledgetConnection_thenCorrect() throws SQLException {
+        assertTrue(C3poDataSource.getConnection().isValid(1));
+    }   
+}

core-java-persistence/src/test/java/com/baeldung/connectionpool/DBCPDataSourceUnitTest.java

@@ -0,0 +1,13 @@
+package com.baeldung.connectionpool;
+
+import java.sql.SQLException;
+import static org.junit.Assert.assertTrue;
+import org.junit.Test;
+
+public class DBCPDataSourceUnitTest {
+    
+    @Test
+    public void givenDBCPDataSourceClass_whenCalledgetConnection_thenCorrect() throws SQLException {
+        assertTrue(DBCPDataSource.getConnection().isValid(1));
+    }   
+}

core-java-persistence/src/test/java/com/baeldung/connectionpool/HikariCPDataSourceUnitTest.java

@@ -0,0 +1,13 @@
+package com.baeldung.connectionpool;
+
+import java.sql.SQLException;
+import static org.junit.Assert.assertTrue;
+import org.junit.Test;
+
+public class HikariCPDataSourceUnitTest {
+    
+    @Test
+    public void givenHikariDataSourceClass_whenCalledgetConnection_thenCorrect() throws SQLException {
+        assertTrue(HikariCPDataSource.getConnection().isValid(1));
+    }   
+}

core-java/README.md

@@ -163,3 +163,8 @@
 - [Console I/O in Java](http://www.baeldung.com/java-console-input-output)
 - [Guide to the java.util.Arrays Class](http://www.baeldung.com/java-util-arrays)
 - [Create a Custom Exception in Java](http://www.baeldung.com/java-new-custom-exception)
+- [Guide to java.util.GregorianCalendar](http://www.baeldung.com/java-gregorian-calendar)
+- [Java Global Exception Handler](http://www.baeldung.com/java-global-exception-handler)
+- [Encrypting and Decrypting Files in Java](http://www.baeldung.com/java-cipher-input-output-stream)
+- [How to Get the Size of an Object in Java](http://www.baeldung.com/java-size-of-object)
+- [Exception Handling in Java](http://www.baeldung.com/java-exceptions)

core-java/pom.xml

@@ -1,5 +1,5 @@
 <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">
+         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
     <modelVersion>4.0.0</modelVersion>
     <groupId>com.baeldung</groupId>
     <artifactId>core-java</artifactId>
@@ -73,9 +73,10 @@
         <dependency>
             <groupId>org.assertj</groupId>
             <artifactId>assertj-core</artifactId>
-            <version>${assertj.version}</version>
+            <version>${assertj-core.version}</version>
             <scope>test</scope>
         </dependency>
+
         <dependency>
             <groupId>commons-codec</groupId>
             <artifactId>commons-codec</artifactId>
@@ -146,6 +147,30 @@
             <artifactId>icu4j</artifactId>
             <version>${icu4j.version}</version>
         </dependency>
+        <!-- Mime Type Resolution Libraries -->
+        <dependency>
+            <groupId>org.apache.tika</groupId>
+            <artifactId>tika-core</artifactId>
+            <version>${tika.version}</version>
+        </dependency>
+        <dependency>
+            <groupId>net.sf.jmimemagic</groupId>
+            <artifactId>jmimemagic</artifactId>
+            <version>${jmime-magic.version}</version>
+        </dependency>
+        <!-- instrumentation -->
+        <dependency>
+            <groupId>org.javassist</groupId>
+            <artifactId>javassist</artifactId>
+            <version>${javaassist.version}</version>
+        </dependency>
+        <dependency>
+            <groupId>com.sun</groupId>
+            <artifactId>tools</artifactId>
+            <version>1.8.0</version>
+            <scope>system</scope>
+            <systemPath>${java.home}/../lib/tools.jar</systemPath>
+        </dependency>
     </dependencies>
 
     <build>
@@ -301,7 +326,7 @@
                     </arguments>
                 </configuration>
             </plugin>
-
+            
             <plugin>
                 <groupId>org.apache.maven.plugins</groupId>
                 <artifactId>maven-javadoc-plugin</artifactId>
@@ -348,6 +373,7 @@
                     <plugin>
                         <groupId>org.codehaus.mojo</groupId>
                         <artifactId>exec-maven-plugin</artifactId>
+                        <version>${exec-maven-plugin.version}</version>
                         <executions>
                             <execution>
                                 <id>run-benchmarks</id>
@@ -372,9 +398,115 @@
                 </plugins>
             </build>
         </profile>
+
+        <!-- java instrumentation profiles to build jars -->
+        <profile>
+            <id>buildAgentLoader</id>
+            <build>
+                <plugins>
+                    <plugin>
+                        <groupId>org.apache.maven.plugins</groupId>
+                        <artifactId>maven-jar-plugin</artifactId>
+                        <executions>
+                            <execution>
+                                <phase>package</phase>
+                                <goals>
+                                    <goal>jar</goal>
+                                </goals>
+                                <configuration>
+                                    <classifier>agentLoader</classifier>
+                                    <classesDirectory>target/classes</classesDirectory>
+                                    <archive>
+                                        <manifest>
+                                            <addClasspath>true</addClasspath>
+                                        </manifest>
+                                        <manifestFile>${project.build.outputDirectory}/META-INF/MANIFEST.MF</manifestFile>
+                                    </archive>
+
+                                    <includes>
+                                        <include>com/baeldung/instrumentation/application/AgentLoader.class</include>
+                                        <include>com/baeldung/instrumentation/application/Launcher.class</include>
+                                    </includes>
+                                </configuration>
+                            </execution>
+                        </executions>
+                    </plugin>
+                </plugins>
+            </build>
+        </profile>
+        <profile>
+            <id>buildApplication</id>
+            <build>
+                <plugins>
+                    <plugin>
+                        <groupId>org.apache.maven.plugins</groupId>
+                        <artifactId>maven-jar-plugin</artifactId>
+                        <executions>
+                            <execution>
+                                <phase>package</phase>
+                                <goals>
+                                    <goal>jar</goal>
+                                </goals>
+                                <configuration>
+                                    <classifier>application</classifier>
+                                    <classesDirectory>target/classes</classesDirectory>
+                                    <archive>
+                                        <manifest>
+                                            <addClasspath>true</addClasspath>
+                                        </manifest>
+                                        <manifestFile>${project.build.outputDirectory}/META-INF/MANIFEST.MF</manifestFile>
+                                    </archive>
+
+                                    <includes>
+                                        <include>com/baeldung/instrumentation/application/MyAtm.class</include>
+                                        <include>com/baeldung/instrumentation/application/MyAtmApplication.class</include>
+                                        <include>com/baeldung/instrumentation/application/Launcher.class</include>
+                                    </includes>
+                                </configuration>
+                            </execution>
+                        </executions>
+                    </plugin>
+                </plugins>
+            </build>
+        </profile>
+        <profile>
+            <id>buildAgent</id>
+            <build>
+                <plugins>
+                    <plugin>
+                        <groupId>org.apache.maven.plugins</groupId>
+                        <artifactId>maven-jar-plugin</artifactId>
+                        <executions>
+                            <execution>
+                                <phase>package</phase>
+                                <goals>
+                                    <goal>jar</goal>
+                                </goals>
+                                <configuration>
+                                    <classifier>agent</classifier>
+                                    <classesDirectory>target/classes</classesDirectory>
+                                    <archive>
+                                        <manifest>
+                                            <addClasspath>true</addClasspath>
+                                        </manifest>
+                                        <manifestFile>${project.build.outputDirectory}/META-INF/MANIFEST.MF</manifestFile>
+                                    </archive>
+
+                                    <includes>
+                                        <include>com/baeldung/instrumentation/agent/AtmTransformer.class</include>
+                                        <include>com/baeldung/instrumentation/agent/MyInstrumentationAgent.class</include>
+                                    </includes>
+                                </configuration>
+                            </execution>
+                        </executions>
+                    </plugin>
+                </plugins>
+            </build>
+        </profile>
     </profiles>
 
     <properties>
+        
         <!-- marshalling -->
         <jackson.version>2.8.5</jackson.version>
         <gson.version>2.8.2</gson.version>
@@ -395,16 +527,18 @@
         <vavr.version>0.9.0</vavr.version>
 
         <!-- testing -->
-        <assertj.version>3.6.1</assertj.version>
+        <assertj-core.version>3.10.0</assertj-core.version>
 
         <!-- maven plugins -->
         <maven-surefire-plugin.version>2.19.1</maven-surefire-plugin.version>
         <springframework.spring-web.version>4.3.4.RELEASE</springframework.spring-web.version>
         <springframework.boot.spring-boot-starter.version>1.5.8.RELEASE</springframework.boot.spring-boot-starter.version>
+        
         <javamoney.moneta.version>1.1</javamoney.moneta.version>
         <h2database.version>1.4.197</h2database.version>
         <esapi.version>2.1.0.1</esapi.version>
         <jmh-core.version>1.19</jmh-core.version>
+       
         <jmh-generator-annprocess.version>1.19</jmh-generator-annprocess.version>
         <maven-javadoc-plugin.version>3.0.0-M1</maven-javadoc-plugin.version>
         <javax.mail.version>1.5.0-b01</javax.mail.version>
@@ -412,7 +546,13 @@
         <onejar-maven-plugin.version>1.4.4</onejar-maven-plugin.version>
         <maven-shade-plugin.version>3.1.1</maven-shade-plugin.version>
         <spring-boot-maven-plugin.version>2.0.3.RELEASE</spring-boot-maven-plugin.version>
+        <exec-maven-plugin.version>1.6.0</exec-maven-plugin.version>
         <icu4j.version>61.1</icu4j.version>
+        <!-- Mime Type Libraries -->
+        <tika.version>1.18</tika.version>
+        <jmime-magic.version>0.1.5</jmime-magic.version>
+        <!-- instrumentation -->
+        <javaassist.version>3.21.0-GA</javaassist.version>
     </properties>
 
-</project>
+</project>

core-java/src/main/java/com/baeldung/instrumentation/agent/AtmTransformer.java

@@ -0,0 +1,70 @@
+package com.baeldung.instrumentation.agent;
+
+import javassist.CannotCompileException;
+import javassist.ClassPool;
+import javassist.CtClass;
+import javassist.CtMethod;
+import javassist.NotFoundException;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+import java.io.IOException;
+import java.lang.instrument.ClassFileTransformer;
+import java.lang.instrument.IllegalClassFormatException;
+import java.security.ProtectionDomain;
+
+public class AtmTransformer implements ClassFileTransformer {
+
+    private static Logger LOGGER = LoggerFactory.getLogger(AtmTransformer.class);
+
+    private static final String WITHDRAW_MONEY_METHOD = "withdrawMoney";
+
+    /** The internal form class name of the class to transform */
+    private String targetClassName;
+    /** The class loader of the class we want to transform */
+    private ClassLoader targetClassLoader;
+
+    public AtmTransformer(String targetClassName, ClassLoader targetClassLoader) {
+        this.targetClassName = targetClassName;
+        this.targetClassLoader = targetClassLoader;
+    }
+
+    @Override
+    public byte[] transform(ClassLoader loader, String className, Class<?> classBeingRedefined,
+            ProtectionDomain protectionDomain, byte[] classfileBuffer) throws IllegalClassFormatException {
+        byte[] byteCode = classfileBuffer;
+
+        String finalTargetClassName = this.targetClassName.replaceAll("\\.", "/"); //replace . with /
+        if (!className.equals(finalTargetClassName)) {
+            return byteCode;
+        }
+
+        if (className.equals(finalTargetClassName) && loader.equals(targetClassLoader)) {
+            LOGGER.info("[Agent] Transforming class MyAtm");
+            try {
+                ClassPool cp = ClassPool.getDefault();
+                CtClass cc = cp.get(targetClassName);
+                CtMethod m = cc.getDeclaredMethod(WITHDRAW_MONEY_METHOD);
+                m.addLocalVariable("startTime", CtClass.longType);
+                m.insertBefore("startTime = System.currentTimeMillis();");
+
+                StringBuilder endBlock = new StringBuilder();
+
+                m.addLocalVariable("endTime", CtClass.longType);
+                m.addLocalVariable("opTime", CtClass.longType);
+                endBlock.append("endTime = System.currentTimeMillis();");
+                endBlock.append("opTime = (endTime-startTime)/1000;");
+
+                endBlock.append("LOGGER.info(\"[Application] Withdrawal operation completed in:\" + opTime + \" seconds!\");");
+
+                m.insertAfter(endBlock.toString());
+
+                byteCode = cc.toBytecode();
+                cc.detach();
+            } catch (NotFoundException | CannotCompileException | IOException e) {
+                LOGGER.error("Exception", e);
+            }
+        }
+        return byteCode;
+    }
+}

core-java/src/main/java/com/baeldung/instrumentation/agent/MyInstrumentationAgent.java

@@ -0,0 +1,59 @@
+package com.baeldung.instrumentation.agent;
+
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+import java.lang.instrument.Instrumentation;
+
+public class MyInstrumentationAgent {
+    private static Logger LOGGER = LoggerFactory.getLogger(MyInstrumentationAgent.class);
+
+    public static void premain(String agentArgs, Instrumentation inst) {
+        LOGGER.info("[Agent] In premain method");
+
+        String className = "com.baeldung.instrumentation.application.MyAtm";
+        transformClass(className,inst);
+    }
+
+    public static void agentmain(String agentArgs, Instrumentation inst) {
+        LOGGER.info("[Agent] In agentmain method");
+
+        String className = "com.baeldung.instrumentation.application.MyAtm";
+        transformClass(className,inst);
+    }
+
+    private static void transformClass(String className, Instrumentation instrumentation) {
+        Class<?> targetCls = null;
+        ClassLoader targetClassLoader = null;
+        // see if we can get the class using forName
+        try {
+            targetCls = Class.forName(className);
+            targetClassLoader = targetCls.getClassLoader();
+            transform(targetCls, targetClassLoader, instrumentation);
+            return;
+        } catch (Exception ex) {
+            LOGGER.error("Class [{}] not found with Class.forName");
+        }
+        // otherwise iterate all loaded classes and find what we want
+        for(Class<?> clazz: instrumentation.getAllLoadedClasses()) {
+            if(clazz.getName().equals(className)) {
+                targetCls = clazz;
+                targetClassLoader = targetCls.getClassLoader();
+                transform(targetCls, targetClassLoader, instrumentation);
+                return;
+            }
+        }
+        throw new RuntimeException("Failed to find class [" + className + "]");
+    }
+
+    private static void transform(Class<?> clazz, ClassLoader classLoader, Instrumentation instrumentation) {
+        AtmTransformer dt = new AtmTransformer(clazz.getName(), classLoader);
+        instrumentation.addTransformer(dt, true);
+        try {
+            instrumentation.retransformClasses(clazz);
+        } catch (Exception ex) {
+            throw new RuntimeException("Transform failed for class: [" + clazz.getName() + "]", ex);
+        }
+    }
+
+}

core-java/src/main/java/com/baeldung/instrumentation/application/AgentLoader.java

@@ -0,0 +1,46 @@
+package com.baeldung.instrumentation.application;
+
+import com.sun.tools.attach.VirtualMachine;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+import java.io.File;
+import java.util.Optional;
+
+/**
+ * Created by adi on 6/10/18.
+ */
+public class AgentLoader {
+    private static Logger LOGGER = LoggerFactory.getLogger(AgentLoader.class);
+
+    public static void run(String[] args) {
+        String agentFilePath = "/home/adi/Desktop/agent-1.0.0-jar-with-dependencies.jar";
+        String applicationName = "MyAtmApplication";
+
+        //iterate all jvms and get the first one that matches our application name
+        Optional<String> jvmProcessOpt = Optional.ofNullable(VirtualMachine.list()
+          .stream()
+          .filter(jvm -> {
+              LOGGER.info("jvm:{}", jvm.displayName());
+              return jvm.displayName().contains(applicationName);
+          })
+          .findFirst().get().id());
+
+        if(!jvmProcessOpt.isPresent()) {
+            LOGGER.error("Target Application not found");
+            return;
+        }
+        File agentFile = new File(agentFilePath);
+        try {
+            String jvmPid = jvmProcessOpt.get();
+            LOGGER.info("Attaching to target JVM with PID: " + jvmPid);
+            VirtualMachine jvm = VirtualMachine.attach(jvmPid);
+            jvm.loadAgent(agentFile.getAbsolutePath());
+            jvm.detach();
+            LOGGER.info("Attached to target JVM and loaded Java agent successfully");
+        } catch (Exception e) {
+            throw new RuntimeException(e);
+        }
+    }
+
+}

core-java/src/main/java/com/baeldung/instrumentation/application/Launcher.java

@@ -0,0 +1,14 @@
+package com.baeldung.instrumentation.application;
+
+/**
+ * Created by adi on 6/14/18.
+ */
+public class Launcher {
+    public static void main(String[] args) throws Exception {
+        if(args[0].equals("StartMyAtmApplication")) {
+            new MyAtmApplication().run(args);
+        } else if(args[0].equals("LoadAgent")) {
+            new AgentLoader().run(args);
+        }
+    }
+}

core-java/src/main/java/com/baeldung/instrumentation/application/MyAtm.java

@@ -0,0 +1,19 @@
+package com.baeldung.instrumentation.application;
+
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+/**
+ * Created by adi on 6/11/18.
+ */
+public class MyAtm {
+    private static Logger LOGGER = LoggerFactory.getLogger(MyAtm.class);
+
+    private static final int account = 10;
+
+    public static void withdrawMoney(int amount) throws InterruptedException {
+        Thread.sleep(2000l); //processing going on here
+        LOGGER.info("[Application] Successful Withdrawal of [{}] units!", amount);
+
+    }
+}

core-java/src/main/java/com/baeldung/instrumentation/application/MyAtmApplication.java

@@ -0,0 +1,19 @@
+package com.baeldung.instrumentation.application;
+
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+public class MyAtmApplication {
+
+    private static Logger LOGGER = LoggerFactory.getLogger(MyAtmApplication.class);
+
+    public static void run(String[] args) throws Exception {
+        LOGGER.info("[Application] Starting ATM application");
+        MyAtm.withdrawMoney(Integer.parseInt(args[2]));
+
+        Thread.sleep(Long.valueOf(args[1]));
+
+        MyAtm.withdrawMoney(Integer.parseInt(args[3]));
+    }
+
+}

core-java/src/main/resources/META-INF/MANIFEST.MF

@@ -0,0 +1,5 @@
+Agent-Class: com.baeldung.instrumentation.agent.MyInstrumentationAgent
+Can-Redefine-Classes: true
+Can-Retransform-Classes: true
+Premain-Class: com.baeldung.instrumentation.agent.MyInstrumentationAgent
+Main-Class: com.baeldung.instrumentation.application.Launcher

core-java/src/main/resources/log4j2.xml

@@ -0,0 +1,13 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<Configuration status="WARN">
+    <Appenders>
+        <Console name="Console" target="SYSTEM_OUT">
+            <PatternLayout pattern="%d{HH:mm:ss.SSS} [%t] %-5level - %msg%n"/>
+        </Console>
+    </Appenders>
+    <Loggers>
+        <Root level="debug">
+            <AppenderRef ref="Console"/>
+        </Root>
+    </Loggers>
+</Configuration>

core-java/src/test/java/com/baeldung/java/mimetype/MimeTypeUnitTest.java

@@ -0,0 +1,131 @@
+package com.baeldung.java.mimetype;
+
+import static org.junit.Assert.assertEquals;
+
+import java.io.File;
+import java.io.IOException;
+import java.net.FileNameMap;
+import java.net.MalformedURLException;
+import java.net.URLConnection;
+import java.nio.file.Files;
+import java.nio.file.Path;
+
+import javax.activation.MimetypesFileTypeMap;
+
+import org.apache.tika.Tika;
+import org.junit.Test;
+
+import net.sf.jmimemagic.Magic;
+import net.sf.jmimemagic.MagicException;
+import net.sf.jmimemagic.MagicMatch;
+import net.sf.jmimemagic.MagicMatchNotFoundException;
+import net.sf.jmimemagic.MagicParseException;
+
+/**
+ * Test class demonstrating various strategies to resolve MIME type of a file.
+ * @author tritty
+ *
+ */
+public class MimeTypeUnitTest {
+    /**
+     * Expected Ouput.
+     */
+    public static final String PNG_EXT = "image/png";
+
+    /**
+     * The location of the file.
+     */
+    public static final String FILE_LOC = "src/test/resources/product.png";
+
+    /**
+     * Test method, demonstrating usage in Java 7.
+     * 
+     * @throws IOException
+     */
+    @Test
+    public void whenUsingJava7_thenSuccess() throws IOException {
+        final Path path = new File(FILE_LOC).toPath();
+        final String mimeType = Files.probeContentType(path);
+        assertEquals(mimeType, PNG_EXT);
+    }
+
+    /**
+     * Test method demonstrating the usage of URLConnection to resolve MIME type.
+     * 
+     * @throws MalformedURLException
+     * @throws IOException
+     */
+    @Test
+    public void whenUsingGetContentType_thenSuccess() throws MalformedURLException, IOException {
+        final File file = new File(FILE_LOC);
+        final URLConnection connection = file.toURL()
+            .openConnection();
+        final String mimeType = connection.getContentType();
+        assertEquals(mimeType, PNG_EXT);
+    }
+
+    /**
+     * Test method demonstrating the usage of URLConnection to resolve MIME type.
+     * 
+     */
+    @Test
+    public void whenUsingGuessContentTypeFromName_thenSuccess() {
+        final File file = new File(FILE_LOC);
+        final String mimeType = URLConnection.guessContentTypeFromName(file.getName());
+        assertEquals(mimeType, PNG_EXT);
+    }
+
+    /**
+     * Test method demonstrating the usage of FileNameMap from URLConnection
+     * to resolve MIME type of a file.
+     * 
+     */
+    @Test
+    public void whenUsingGetFileNameMap_thenSuccess() {
+        final File file = new File(FILE_LOC);
+        final FileNameMap fileNameMap = URLConnection.getFileNameMap();
+        final String mimeType = fileNameMap.getContentTypeFor(file.getName());
+        assertEquals(mimeType, PNG_EXT);
+    }
+
+    /**
+     * Test method demonstrating the usage of MimeTypesFileTypeMap for resolution of 
+     * MIME type.
+     * 
+     */
+    @Test
+    public void whenUsingMimeTypesFileTypeMap_thenSuccess() {
+        final File file = new File(FILE_LOC);
+        final MimetypesFileTypeMap fileTypeMap = new MimetypesFileTypeMap();
+        final String mimeType = fileTypeMap.getContentType(file.getName());
+        assertEquals(mimeType, PNG_EXT);
+    }
+
+    /**
+     * Test method demonstrating usage of jMimeMagic.
+     * 
+     * @throws MagicParseException
+     * @throws MagicMatchNotFoundException
+     * @throws MagicException
+     */
+    @Test
+    public void whenUsingJmimeMagic_thenSuccess() throws MagicParseException, MagicMatchNotFoundException, MagicException {
+        final File file = new File(FILE_LOC);
+        final Magic magic = new Magic();
+        final MagicMatch match = magic.getMagicMatch(file, false);
+        assertEquals(match.getMimeType(), PNG_EXT);
+    }
+
+    /**
+     * Test method demonstrating usage of Apache Tika.
+     * 
+     * @throws IOException
+     */
+    @Test
+    public void whenUsingTika_thenSuccess() throws IOException {
+        final File file = new File(FILE_LOC);
+        final Tika tika = new Tika();
+        final String mimeType = tika.detect(file);
+        assertEquals(mimeType, PNG_EXT);
+    }
+}

core-kotlin/README.md

@@ -34,3 +34,5 @@
 - [Java EE 8 Security API](http://www.baeldung.com/java-ee-8-security)
 - [Kotlin with Ktor](http://www.baeldung.com/kotlin-ktor)
 - [Working with Enums in Kotlin](http://www.baeldung.com/kotlin-enum)
+- [Create a Java and Kotlin Project with Maven](http://www.baeldung.com/kotlin-maven-java-project)
+- [Reflection with Kotlin](http://www.baeldung.com/kotlin-reflection)

geotools/pom.xml

@@ -1,61 +1,62 @@
-<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
-    xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
-    <modelVersion>4.0.0</modelVersion>
-    <groupId>com.baeldung</groupId>
-    <artifactId>geotools</artifactId>
-    <version>0.0.1-SNAPSHOT</version>
-    <packaging>jar</packaging>
-    <name>geotools</name>
-    <url>http://maven.apache.org</url>
+<project xmlns="http://maven.apache.org/POM/4.0.0"
+	xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+	xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
+	<modelVersion>4.0.0</modelVersion>
+	<artifactId>geotools</artifactId>
+	<version>0.0.1-SNAPSHOT</version>
+	<packaging>jar</packaging>
+	<name>geotools</name>
+	<url>http://maven.apache.org</url>
 
-    <parent>
-        <groupId>com.baeldung</groupId>
-        <artifactId>parent-modules</artifactId>
-        <version>1.0.0-SNAPSHOT</version>
-    </parent>
+	<parent>
+		<groupId>com.baeldung</groupId>
+		<artifactId>parent-modules</artifactId>
+		<version>1.0.0-SNAPSHOT</version>
+	</parent>
 
-    <dependencies>
-        <dependency>
-            <groupId>org.geotools</groupId>
-            <artifactId>gt-shapefile</artifactId>
-            <version>${geotools-shapefile.version}</version>
-        </dependency>
-        <dependency>
-            <groupId>org.geotools</groupId>
-            <artifactId>gt-epsg-hsql</artifactId>
-            <version>${geotools.version}</version>
-        </dependency>
-        <dependency>
-            <groupId>org.geotools</groupId>
-            <artifactId>gt-swing</artifactId>
-            <version>${geotools-swing.version}</version>
-        </dependency>
-    </dependencies>
+	<dependencies>
+		<dependency>
+			<groupId>org.geotools</groupId>
+			<artifactId>gt-shapefile</artifactId>
+			<version>${geotools-shapefile.version}</version>
+		</dependency>
+		<dependency>
+			<groupId>org.geotools</groupId>
+			<artifactId>gt-epsg-hsql</artifactId>
+			<version>${geotools.version}</version>
+		</dependency>
+		<dependency>
+			<groupId>org.geotools</groupId>
+			<artifactId>gt-swing</artifactId>
+			<version>${geotools-swing.version}</version>
+		</dependency>
+	</dependencies>
 
-    <repositories>
-        <repository>
-            <id>maven2-repository.dev.java.net</id>
-            <name>Java.net repository</name>
-            <url>http://download.java.net/maven/2</url>
-        </repository>
-        <repository>
-            <id>osgeo</id>
-            <name>Open Source Geospatial Foundation Repository</name>
-            <url>http://download.osgeo.org/webdav/geotools/</url>
-        </repository>
-        <repository>
-            <snapshots>
-                <enabled>true</enabled>
-            </snapshots>
-            <id>opengeo</id>
-            <name>OpenGeo Maven Repository</name>
-            <url>http://repo.opengeo.org</url>
-        </repository>
-    </repositories>
+	<repositories>
+		<repository>
+			<id>maven2-repository.dev.java.net</id>
+			<name>Java.net repository</name>
+			<url>http://download.java.net/maven/2</url>
+		</repository>
+		<repository>
+			<id>osgeo</id>
+			<name>Open Source Geospatial Foundation Repository</name>
+			<url>http://download.osgeo.org/webdav/geotools/</url>
+		</repository>
+		<repository>
+			<snapshots>
+				<enabled>true</enabled>
+			</snapshots>
+			<id>opengeo</id>
+			<name>OpenGeo Maven Repository</name>
+			<url>http://repo.opengeo.org</url>
+		</repository>
+	</repositories>
+
+	<properties>
+		<geotools.version>15.2</geotools.version>
+		<geotools-swing.version>15.2</geotools-swing.version>
+		<geotools-shapefile.version>15.2</geotools-shapefile.version>
+	</properties>
 
-    <properties>
-        <geotools.version>15.2</geotools.version>
-        <geotools-swing.version>15.2</geotools-swing.version>
-        <geotools-shapefile.version>15.2</geotools-shapefile.version>
-    </properties>
 </project>

google-web-toolkit/README.md

@@ -0,0 +1,2 @@
+### Relevant Articles: 
+- [Introduction to GWT](http://www.baeldung.com/gwt)

google-web-toolkit/pom.xml

@@ -6,10 +6,16 @@
 	<!-- 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>
 
+    <parent>
+        <groupId>com.baeldung</groupId>
+        <artifactId>parent-modules</artifactId>
+        <version>1.0.0-SNAPSHOT</version>
+    </parent>
+
 	<dependencyManagement>
 		<dependencies>
 			<!-- ensure all GWT deps use the same version (unless overridden) -->

google-web-toolkit/src/main/java/com/baeldung/Google_web_toolkit.gwt.xml

@@ -22,6 +22,8 @@
   <!-- Specify the app entry point class.                         -->
   <entry-point class='com.baeldung.client.Google_web_toolkit'/>
 
+  <set-property name="user.agent" value="gecko1_8"/>
+
   <!-- Specify the paths for translatable code                    -->
   <source path='client'/>
   <source path='shared'/>

hibernate5/pom.xml

@@ -5,8 +5,6 @@
     <groupId>com.baeldung</groupId>
     <artifactId>hibernate5</artifactId>
     <version>0.0.1-SNAPSHOT</version>
-    <name>hibernate5</name>
-    <url>http://maven.apache.org</url>
 
     <parent>
         <groupId>com.baeldung</groupId>
@@ -59,9 +57,6 @@
     </build>
 
     <properties>
-        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
-        <!-- Maven plugins -->
-        <maven-compiler-plugin.version>3.7.0</maven-compiler-plugin.version>
         <hibernate.version>5.3.2.Final</hibernate.version>
         <mysql.version>6.0.6</mysql.version>
         <mariaDB4j.version>2.2.3</mariaDB4j.version>

hibernate5/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> %date [%thread] %-5level %logger{36} - %message%n
+            </pattern>
+        </encoder>
+    </appender>
+
+    <root level="INFO">
+        <appender-ref ref="STDOUT" />
+    </root>
+</configuration>

jhipster/jhipster-monolithic/pom.xml

@@ -347,7 +347,7 @@
             </plugins>
         </pluginManagement>
         <plugins>
-            <plugin>
+            <!-- <plugin>
                 <groupId>com.github.ekryd.sortpom</groupId>
                 <artifactId>sortpom-maven-plugin</artifactId>
                 <version>${sortpom-maven-plugin.version}</version>
@@ -367,7 +367,7 @@
                     <keepBlankLines>true</keepBlankLines>
                     <expandEmptyElements>false</expandEmptyElements>
                 </configuration>
-            </plugin>
+            </plugin> -->
             <plugin>
                 <groupId>com.spotify</groupId>
                 <artifactId>docker-maven-plugin</artifactId>

jnosql/jnosql-artemis/pom.xml

@@ -0,0 +1,88 @@
+<?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>
+
+    <parent>
+        <groupId>com.baeldung.jnosql</groupId>
+        <artifactId>jnosql</artifactId>
+        <version>1.0-SNAPSHOT</version>
+    </parent>
+
+    <artifactId>jnosql-artemis</artifactId>
+    <packaging>war</packaging>
+
+    <properties>
+        <liberty-maven-plugin.version>2.4.2</liberty-maven-plugin.version>
+        <failOnMissingWebXml>false</failOnMissingWebXml>
+    </properties>
+
+    <build>
+        <finalName>${artifactId}</finalName>
+        <plugins>
+            <plugin>
+                <groupId>net.wasdev.wlp.maven.plugins</groupId>
+                <artifactId>liberty-maven-plugin</artifactId>
+                <version>${liberty-maven-plugin.version}</version>
+                <configuration>
+                    <assemblyArtifact>
+                        <groupId>io.openliberty</groupId>
+                        <artifactId>openliberty-webProfile8</artifactId>
+                        <version>RELEASE</version>
+                        <type>zip</type>
+                    </assemblyArtifact>
+                    <installAppPackages>project</installAppPackages>
+                    <looseApplication>true</looseApplication>
+                    <configFile>src/main/liberty/config/server.xml</configFile>
+                </configuration>
+                <executions>
+                    <execution>
+                        <id>install-server</id>
+                        <phase>prepare-package</phase>
+                        <goals>
+                            <goal>install-server</goal>
+                            <goal>create-server</goal>
+                            <goal>install-feature</goal>
+                        </goals>
+                    </execution>
+                    <execution>
+                        <id>install-apps</id>
+                        <phase>package</phase>
+                        <goals>
+                            <goal>install-apps</goal>
+                        </goals>
+                    </execution>
+                </executions>
+            </plugin>
+        </plugins>
+    </build>
+
+    <dependencies>
+
+        <dependency>
+            <groupId>javax</groupId>
+            <artifactId>javaee-web-api</artifactId>
+            <version>8.0</version>
+            <scope>provided</scope>
+        </dependency>
+
+        <dependency>
+            <groupId>org.jnosql.artemis</groupId>
+            <artifactId>artemis-configuration</artifactId>
+            <version>${jnosql.version}</version>
+        </dependency>
+        <dependency>
+            <groupId>org.jnosql.artemis</groupId>
+            <artifactId>artemis-document</artifactId>
+            <version>${jnosql.version}</version>
+        </dependency>
+        <dependency>
+            <groupId>org.jnosql.diana</groupId>
+            <artifactId>mongodb-driver</artifactId>
+            <version>${jnosql.version}</version>
+        </dependency>
+
+    </dependencies>
+
+</project>

jnosql/jnosql-artemis/src/main/java/com/baeldung/jnosql/artemis/AppConfig.java

@@ -0,0 +1,10 @@
+package com.baeldung.jnosql.artemis;
+
+import javax.enterprise.context.Initialized;
+import javax.enterprise.event.Observes;
+import javax.ws.rs.ApplicationPath;
+import javax.ws.rs.core.Application;
+
+@ApplicationPath("")
+public class AppConfig extends Application {
+}

jnosql/jnosql-artemis/src/main/java/com/baeldung/jnosql/artemis/EmbeddedMongoDBSetup.java

@@ -0,0 +1,52 @@
+package com.baeldung.jnosql.artemis;
+
+import de.flapdoodle.embed.mongo.MongodExecutable;
+import de.flapdoodle.embed.mongo.MongodProcess;
+import de.flapdoodle.embed.mongo.MongodStarter;
+import de.flapdoodle.embed.mongo.config.MongodConfigBuilder;
+import de.flapdoodle.embed.mongo.config.Net;
+import de.flapdoodle.embed.mongo.distribution.Version;
+import de.flapdoodle.embed.process.runtime.Network;
+
+import javax.enterprise.context.ApplicationScoped;
+import javax.enterprise.context.Destroyed;
+import javax.enterprise.context.Initialized;
+import javax.enterprise.event.Observes;
+import java.io.IOException;
+
+@ApplicationScoped
+public class EmbeddedMongoDBSetup {
+
+    private static final String MONGODB_HOST = "localhost";
+    private static final int MONGODB_PORT = 27019;
+
+    private static final MongodStarter starter = MongodStarter.getDefaultInstance();
+    private static MongodExecutable _mongodExe;
+    private static MongodProcess _mongod;
+
+    public void init(@Observes @Initialized(ApplicationScoped.class) Object init) {
+        try {
+            System.out.println("Starting Embedded MongoDB");
+            initdb();
+            System.out.println("Embedded MongoDB started");
+        } catch (IOException e) {
+            System.out.println("Embedded MongoDB starting error !!");
+            e.printStackTrace();
+        }
+    }
+
+    private void initdb() throws IOException {
+        _mongodExe = starter.prepare(new MongodConfigBuilder()
+                .version(Version.Main.DEVELOPMENT)
+                .net(new Net(MONGODB_HOST, MONGODB_PORT, Network.localhostIsIPv6()))
+                .build());
+        _mongod = _mongodExe.start();
+    }
+
+    public void destroy(@Observes @Destroyed(ApplicationScoped.class) Object init) {
+        System.out.println("Stopping Embedded MongoDB");
+        _mongod.stop();
+        _mongodExe.stop();
+        System.out.println("Embedded MongoDB stopped !");
+    }
+}

jnosql/jnosql-artemis/src/main/java/com/baeldung/jnosql/artemis/EntityManagerProducer.java

@@ -0,0 +1,33 @@
+package com.baeldung.jnosql.artemis;
+
+import org.jnosql.artemis.ConfigurationUnit;
+import org.jnosql.diana.api.document.DocumentCollectionManager;
+import org.jnosql.diana.api.document.DocumentCollectionManagerFactory;
+import org.jnosql.diana.mongodb.document.MongoDBDocumentCollectionManager;
+import org.jnosql.diana.mongodb.document.MongoDBDocumentConfiguration;
+
+import javax.annotation.PostConstruct;
+import javax.enterprise.context.ApplicationScoped;
+import javax.enterprise.inject.Disposes;
+import javax.enterprise.inject.Produces;
+import javax.inject.Inject;
+
+@ApplicationScoped
+public class EntityManagerProducer {
+
+    private static final String DATABASE = "todos";
+
+    @Inject
+    @ConfigurationUnit(name = "document")
+    private DocumentCollectionManagerFactory<MongoDBDocumentCollectionManager> managerFactory;
+
+    @Produces
+    public DocumentCollectionManager getEntityManager() {
+        return managerFactory.get(DATABASE);
+    }
+
+    public void close(@Disposes DocumentCollectionManager entityManager) {
+        entityManager.close();
+    }
+
+}

jnosql/jnosql-artemis/src/main/java/com/baeldung/jnosql/artemis/RepositoryTodoManager.java

@@ -0,0 +1,41 @@
+package com.baeldung.jnosql.artemis;
+
+import com.baeldung.jnosql.artemis.qualifier.Repo;
+import org.jnosql.artemis.Database;
+import org.jnosql.artemis.DatabaseType;
+
+import javax.enterprise.context.ApplicationScoped;
+import javax.inject.Inject;
+import java.util.List;
+import java.util.Optional;
+
+@ApplicationScoped
+@Repo
+public class RepositoryTodoManager implements TodoManager {
+
+    @Inject
+    @Database(DatabaseType.DOCUMENT)
+    private TodoRepository repository;
+
+    @Override
+    public Todo add(Todo todo) {
+        return repository.save(todo);
+    }
+
+    @Override
+    public Todo get(String id) {
+        Optional<Todo> todo = repository.findById(id);
+        return todo.get();
+    }
+
+    @Override
+    public List<Todo> getAll() {
+        return repository.findAll();
+    }
+
+    @Override
+    public void delete(String id) {
+        repository.deleteById(id);
+    }
+
+}

jnosql/jnosql-artemis/src/main/java/com/baeldung/jnosql/artemis/TemplateTodoManager.java

@@ -0,0 +1,43 @@
+package com.baeldung.jnosql.artemis;
+
+import com.baeldung.jnosql.artemis.qualifier.Template;
+import org.jnosql.artemis.document.DocumentTemplate;
+import org.jnosql.diana.api.document.DocumentQuery;
+
+import javax.enterprise.context.ApplicationScoped;
+import javax.inject.Inject;
+import java.util.List;
+import java.util.Optional;
+
+import static org.jnosql.diana.api.document.query.DocumentQueryBuilder.select;
+
+@ApplicationScoped
+@Template
+public class TemplateTodoManager implements TodoManager {
+
+    @Inject
+    private DocumentTemplate documentTemplate;
+
+    @Override
+    public Todo add(Todo todo) {
+        return documentTemplate.insert(todo);
+    }
+
+    @Override
+    public Todo get(String id) {
+        Optional<Todo> todo = documentTemplate.find(Todo.class, id);
+        return todo.get();
+    }
+
+    @Override
+    public List<Todo> getAll() {
+        DocumentQuery query = select().from("Todo").build();
+        return documentTemplate.select(query);
+    }
+
+    @Override
+    public void delete(String id) {
+        documentTemplate.delete(Todo.class, id);
+    }
+
+}

jnosql/jnosql-artemis/src/main/java/com/baeldung/jnosql/artemis/Todo.java

@@ -0,0 +1,51 @@
+package com.baeldung.jnosql.artemis;
+
+import org.jnosql.artemis.Column;
+import org.jnosql.artemis.Entity;
+import org.jnosql.artemis.Id;
+
+import java.io.Serializable;
+
+@Entity
+public class Todo implements Serializable {
+
+    @Id("id")
+    public String id;
+    @Column
+    public String name;
+    @Column
+    public String description;
+
+    public Todo() {
+    }
+
+    public Todo(String id, String name, String description) {
+        this.id = id;
+        this.name = name;
+        this.description = description;
+    }
+
+    public String getId() {
+        return id;
+    }
+
+    public void setId(String id) {
+        this.id = id;
+    }
+
+    public String getName() {
+        return name;
+    }
+
+    public void setName(String name) {
+        this.name = name;
+    }
+
+    public String getDescription() {
+        return description;
+    }
+
+    public void setDescription(String description) {
+        this.description = description;
+    }
+}

jnosql/jnosql-artemis/src/main/java/com/baeldung/jnosql/artemis/TodoManager.java

@@ -0,0 +1,14 @@
+package com.baeldung.jnosql.artemis;
+
+import java.util.List;
+
+public interface TodoManager {
+
+    Todo add(Todo todo);
+
+    Todo get(String id);
+
+    List<Todo> getAll();
+
+    void delete(String id);
+}

jnosql/jnosql-artemis/src/main/java/com/baeldung/jnosql/artemis/TodoRepository.java

@@ -0,0 +1,10 @@
+package com.baeldung.jnosql.artemis;
+
+import org.jnosql.artemis.Repository;
+
+import java.util.List;
+
+public interface TodoRepository extends Repository<Todo, String> {
+    List<Todo> findByName(String name);
+    List<Todo> findAll();
+}

jnosql/jnosql-artemis/src/main/java/com/baeldung/jnosql/artemis/TodoResource.java

@@ -0,0 +1,48 @@
+package com.baeldung.jnosql.artemis;
+
+import com.baeldung.jnosql.artemis.qualifier.Repo;
+import com.baeldung.jnosql.artemis.qualifier.Template;
+
+import javax.inject.Inject;
+import javax.ws.rs.*;
+import javax.ws.rs.core.MediaType;
+import javax.ws.rs.core.Response;
+import javax.ws.rs.core.UriBuilder;
+
+@Path("todos")
+public class TodoResource {
+
+    /*
+    Use eiher @Template or @Repo
+     */
+    @Inject
+    @Template
+    //@Repo
+    private TodoManager todoManager;
+
+    @GET
+    @Path("")
+    @Produces(MediaType.APPLICATION_JSON)
+    public Response all() {
+        return Response.ok(todoManager.getAll()).build();
+    }
+
+    @GET
+    @Path("{id}")
+    @Produces(MediaType.APPLICATION_JSON)
+    public Response get(@PathParam("id") String id) {
+        Todo todo = todoManager.get(id);
+        return Response.ok(todo).build();
+    }
+
+    @POST
+    @Consumes(MediaType.APPLICATION_JSON)
+    public Response add(Todo todo) {
+        Todo savedTodo = todoManager.add(todo);
+        System.out.println(savedTodo.id);
+        return Response.created(
+                UriBuilder.fromResource(this.getClass()).path(String.valueOf(savedTodo.id)).build())
+                .build();
+    }
+
+}

jnosql/jnosql-artemis/src/main/java/com/baeldung/jnosql/artemis/qualifier/Repo.java

@@ -0,0 +1,13 @@
+package com.baeldung.jnosql.artemis.qualifier;
+
+import javax.inject.Qualifier;
+import java.lang.annotation.ElementType;
+import java.lang.annotation.Retention;
+import java.lang.annotation.RetentionPolicy;
+import java.lang.annotation.Target;
+
+@Retention(RetentionPolicy.RUNTIME)
+@Target({ElementType.FIELD, ElementType.TYPE})
+@Qualifier
+public @interface Repo {
+}

jnosql/jnosql-artemis/src/main/java/com/baeldung/jnosql/artemis/qualifier/Template.java

@@ -0,0 +1,13 @@
+package com.baeldung.jnosql.artemis.qualifier;
+
+import javax.inject.Qualifier;
+import java.lang.annotation.ElementType;
+import java.lang.annotation.Retention;
+import java.lang.annotation.RetentionPolicy;
+import java.lang.annotation.Target;
+
+@Retention(RetentionPolicy.RUNTIME)
+@Target({ElementType.FIELD, ElementType.TYPE})
+@Qualifier
+public @interface Template {
+}

jnosql/jnosql-artemis/src/main/liberty/config/server.xml

@@ -0,0 +1,6 @@
+<server description="OpenLiberty Server">
+    <featureManager>
+        <feature>webProfile-8.0</feature>
+    </featureManager>
+    <httpEndpoint httpPort="9080" httpsPort="9443" id="defaultHttpEndpoint" host="*"/>
+</server>

jnosql/jnosql-artemis/src/main/resources/META-INF/beans.xml

@@ -0,0 +1,6 @@
+<beans xmlns="http://xmlns.jcp.org/xml/ns/javaee"
+       xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+       xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/javaee
+		http://xmlns.jcp.org/xml/ns/javaee/beans_2_0.xsd"
+       bean-discovery-mode="all">
+</beans>

jnosql/jnosql-artemis/src/main/resources/META-INF/jnosql.json

@@ -0,0 +1,10 @@
+[
+  {
+    "description": "The mongodb document configuration",
+    "name": "document",
+    "provider": "org.jnosql.diana.mongodb.document.MongoDBDocumentConfiguration",
+    "settings": {
+      "mongodb-server-host-1":"localhost:27019"
+    }
+  }
+]

jnosql/jnosql-artemis/src/main/webapp/WEB-INF/jnosql.json

@@ -0,0 +1,10 @@
+[
+  {
+    "description": "The mongodb document configuration",
+    "name": "document",
+    "provider": "org.jnosql.diana.mongodb.document.MongoDBDocumentConfiguration",
+    "settings": {
+      "mongodb-server-host-1":"localhost:27019"
+    }
+  }
+]

jnosql/jnosql-diana/pom.xml

@@ -0,0 +1,93 @@
+<?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>
+
+    <parent>
+        <groupId>com.baeldung.jnosql</groupId>
+        <artifactId>jnosql</artifactId>
+        <version>1.0-SNAPSHOT</version>
+    </parent>
+
+    <artifactId>jnosql-diana</artifactId>
+
+    <build>
+        <plugins>
+            <plugin>
+                <groupId>org.codehaus.mojo</groupId>
+                <artifactId>exec-maven-plugin</artifactId>
+                <version>1.6.0</version>
+                <executions>
+                    <execution>
+                        <id>document</id>
+                        <goals>
+                            <goal>java</goal>
+                        </goals>
+                        <configuration>
+                            <mainClass>com.baeldung.jnosql.diana.document.DocumentApp</mainClass>
+                        </configuration>
+                    </execution>
+                    <execution>
+                        <id>column</id>
+                        <goals>
+                            <goal>java</goal>
+                        </goals>
+                        <configuration>
+                            <mainClass>com.baeldung.jnosql.diana.column.ColumnFamilyApp</mainClass>
+                        </configuration>
+                    </execution>
+                    <execution>
+                        <id>key</id>
+                        <goals>
+                            <goal>java</goal>
+                        </goals>
+                        <configuration>
+                            <mainClass>com.baeldung.jnosql.diana.key.KeyValueApp</mainClass>
+                        </configuration>
+                    </execution>
+                </executions>
+            </plugin>
+        </plugins>
+    </build>
+
+    <dependencies>
+
+        <!--NoSQL Document oriented-->
+        <dependency>
+            <groupId>org.jnosql.diana</groupId>
+            <artifactId>diana-document</artifactId>
+            <version>0.0.5</version>
+        </dependency>
+        <dependency>
+            <groupId>org.jnosql.diana</groupId>
+            <artifactId>mongodb-driver</artifactId>
+            <version>0.0.5</version>
+        </dependency>
+
+        <!--NoSQL Column oriented-->
+        <dependency>
+            <groupId>org.jnosql.diana</groupId>
+            <artifactId>diana-column</artifactId>
+            <version>0.0.5</version>
+        </dependency>
+        <dependency>
+            <groupId>org.jnosql.diana</groupId>
+            <artifactId>cassandra-driver</artifactId>
+            <version>0.0.5</version>
+        </dependency>
+
+        <!--NoSQL Key Value oriented-->
+        <dependency>
+            <groupId>org.jnosql.diana</groupId>
+            <artifactId>diana-key-value</artifactId>
+            <version>0.0.5</version>
+        </dependency>
+        <dependency>
+            <groupId>org.jnosql.diana</groupId>
+            <artifactId>hazelcast-driver</artifactId>
+            <version>0.0.5</version>
+        </dependency>
+    </dependencies>
+
+</project>

jnosql/jnosql-diana/src/main/java/com/baeldung/jnosql/diana/column/ColumnFamilyApp.java

@@ -0,0 +1,32 @@
+package com.baeldung.jnosql.diana.column;
+
+import org.cassandraunit.utils.EmbeddedCassandraServerHelper;
+import org.jnosql.diana.api.column.*;
+import org.jnosql.diana.cassandra.column.CassandraConfiguration;
+
+public class ColumnFamilyApp {
+
+    private static final String KEY_SPACE = "myKeySpace";
+    private static final String COLUMN_FAMILY = "books";
+
+    public static void main(String... args) throws Exception {
+
+        EmbeddedCassandraServerHelper.startEmbeddedCassandra();
+
+        ColumnConfiguration configuration = new CassandraConfiguration();
+        try(ColumnFamilyManagerFactory entityManagerFactory = configuration.get()) {
+            ColumnFamilyManager entityManager = entityManagerFactory.get(KEY_SPACE);
+            ColumnEntity columnEntity = ColumnEntity.of(COLUMN_FAMILY);
+            Column key = Columns.of("id", 10L);
+            Column name = Columns.of("name", "JNoSQL in Acion");
+            columnEntity.add(key);
+            columnEntity.add(name);
+            ColumnEntity saved = entityManager.insert(columnEntity);
+            System.out.println(saved);
+        }
+
+        EmbeddedCassandraServerHelper.cleanEmbeddedCassandra();
+        EmbeddedCassandraServerHelper.stopEmbeddedCassandra();
+    }
+
+}

jnosql/jnosql-diana/src/main/java/com/baeldung/jnosql/diana/document/DocumentApp.java

@@ -0,0 +1,67 @@
+package com.baeldung.jnosql.diana.document;
+
+import org.jnosql.diana.api.Settings;
+import org.jnosql.diana.api.document.*;
+import org.jnosql.diana.mongodb.document.MongoDBDocumentConfiguration;
+
+import java.util.HashMap;
+import java.util.List;
+import java.util.Map;
+
+import static org.jnosql.diana.api.document.query.DocumentQueryBuilder.delete;
+import static org.jnosql.diana.api.document.query.DocumentQueryBuilder.select;
+
+public class DocumentApp {
+
+    private static final String DB_NAME = "my-db";
+    private static final String DOCUMENT_COLLECTION = "books";
+
+    public static final String KEY_NAME = "_id";
+
+    DocumentConfiguration configuration = new MongoDBDocumentConfiguration();
+
+    public static void main(String... args) throws Exception {
+        MongoDbInit.startMongoDb();
+
+        DocumentApp app = new DocumentApp();
+        app.process();
+
+        MongoDbInit.stopMongoDb();
+    }
+
+    public void process() {
+
+        Map<String, Object> map = new HashMap<>();
+        map.put("mongodb-server-host-1", "localhost:27017");
+
+        try (DocumentCollectionManagerFactory managerFactory = configuration.get(Settings.of(map));
+             DocumentCollectionManager manager = managerFactory.get(DB_NAME);) {
+
+            DocumentEntity documentEntity = DocumentEntity.of(DOCUMENT_COLLECTION);
+            documentEntity.add(Document.of(KEY_NAME, "100"));
+            documentEntity.add(Document.of("name", "JNoSQL in Action"));
+            documentEntity.add(Document.of("pages", 620));
+
+            //CREATE
+            DocumentEntity saved = manager.insert(documentEntity);
+
+            //READ
+            DocumentQuery query = select().from(DOCUMENT_COLLECTION).where(KEY_NAME).eq("100").build();
+            List<DocumentEntity> entities = manager.select(query);
+            System.out.println(entities.get(0));
+
+            //UPDATE
+            saved.add(Document.of("author", "baeldung"));
+            DocumentEntity updated = manager.update(saved);
+            System.out.println(updated);
+
+            //DELETE
+            DocumentDeleteQuery deleteQuery = delete().from(DOCUMENT_COLLECTION).where(KEY_NAME).eq("100").build();
+            manager.delete(deleteQuery);
+
+            List<DocumentEntity> documentEntityList = manager.select(select().from(DOCUMENT_COLLECTION).build());
+            System.out.println(documentEntityList);
+        }
+    }
+
+}

jnosql/jnosql-diana/src/main/java/com/baeldung/jnosql/diana/document/MongoDbInit.java

@@ -0,0 +1,32 @@
+package com.baeldung.jnosql.diana.document;
+
+import de.flapdoodle.embed.mongo.MongodExecutable;
+import de.flapdoodle.embed.mongo.MongodProcess;
+import de.flapdoodle.embed.mongo.MongodStarter;
+import de.flapdoodle.embed.mongo.config.MongodConfigBuilder;
+import de.flapdoodle.embed.mongo.config.Net;
+import de.flapdoodle.embed.mongo.distribution.Version;
+import de.flapdoodle.embed.process.runtime.Network;
+
+import java.io.IOException;
+
+public abstract class MongoDbInit {
+
+    private static final MongodStarter starter = MongodStarter.getDefaultInstance();
+    private static MongodExecutable _mongodExe;
+    private static MongodProcess _mongod;
+
+    public static void startMongoDb() throws IOException {
+        _mongodExe = starter.prepare(new MongodConfigBuilder()
+                .version(Version.Main.DEVELOPMENT)
+                .net(new Net("localhost", 27017, Network.localhostIsIPv6()))
+                .build());
+        _mongod = _mongodExe.start();
+    }
+
+    public static void stopMongoDb(){
+        _mongod.stop();
+        _mongodExe.stop();
+    }
+
+}

jnosql/jnosql-diana/src/main/java/com/baeldung/jnosql/diana/key/Book.java

@@ -0,0 +1,63 @@
+package com.baeldung.jnosql.diana.key;
+
+import java.io.Serializable;
+
+public class Book implements Serializable {
+
+    private String isbn;
+    private String name;
+    private String author;
+    private int pages;
+
+    public Book() {
+    }
+
+    public Book(String isbn, String name, String author, int pages) {
+        this.isbn = isbn;
+        this.name = name;
+        this.author = author;
+        this.pages = pages;
+    }
+
+    public String getIsbn() {
+        return isbn;
+    }
+
+    public void setIsbn(String isbn) {
+        this.isbn = isbn;
+    }
+
+    public String getName() {
+        return name;
+    }
+
+    public void setName(String name) {
+        this.name = name;
+    }
+
+    public String getAuthor() {
+        return author;
+    }
+
+    public void setAuthor(String author) {
+        this.author = author;
+    }
+
+    public int getPages() {
+        return pages;
+    }
+
+    public void setPages(int pages) {
+        this.pages = pages;
+    }
+
+    @Override
+    public String toString() {
+        return "Book{" +
+                "isbn='" + isbn + '\'' +
+                ", name='" + name + '\'' +
+                ", author='" + author + '\'' +
+                ", pages=" + pages +
+                '}';
+    }
+}

jnosql/jnosql-diana/src/main/java/com/baeldung/jnosql/diana/key/KeyValueApp.java

@@ -0,0 +1,33 @@
+package com.baeldung.jnosql.diana.key;
+
+import com.hazelcast.core.Hazelcast;
+import org.jnosql.diana.api.Value;
+import org.jnosql.diana.api.key.BucketManager;
+import org.jnosql.diana.api.key.BucketManagerFactory;
+import org.jnosql.diana.api.key.KeyValueConfiguration;
+import org.jnosql.diana.api.key.KeyValueEntity;
+import org.jnosql.diana.hazelcast.key.HazelcastKeyValueConfiguration;
+
+import java.util.Optional;
+
+public class KeyValueApp {
+
+    private static final String BUCKET_NAME = "books";
+
+    public static void main(String... args) throws Exception {
+        KeyValueConfiguration configuration = new HazelcastKeyValueConfiguration();
+        try (BucketManagerFactory managerFactory = configuration.get()) {
+            BucketManager manager = managerFactory.getBucketManager(BUCKET_NAME);
+
+            Book book = new Book("12345", "JNoSQL in Action", "baeldung", 420);
+            KeyValueEntity keyValueEntity = KeyValueEntity.of(book.getIsbn(), book);
+            manager.put(keyValueEntity);
+
+            Optional<Value> optionalValue = manager.get("12345");
+            Value value = optionalValue.get();
+            Book savedBook = value.get(Book.class);
+            System.out.println(savedBook);
+        }
+        Hazelcast.shutdownAll();
+    }
+}

jnosql/jnosql-diana/src/main/resources/diana-cassandra.properties

@@ -0,0 +1,5 @@
+cassandra-host-1=localhost
+cassandra-port=9142
+#cassandra-threads-number=2
+cassandra-query-1=CREATE KEYSPACE IF NOT EXISTS myKeySpace WITH replication = {'class': 'SimpleStrategy', 'replication_factor' : 3};
+cassandra-query-2=CREATE COLUMNFAMILY IF NOT EXISTS myKeySpace.books (id bigint PRIMARY KEY, name text);

jnosql/jnosql-diana/src/main/resources/diana-hazelcast.properties

@@ -0,0 +1 @@
+hazelcast-instanceName=hazelcast

jnosql/jnosql-diana/src/main/resources/diana-mongodb.properties

@@ -0,0 +1,2 @@
+#Define Host and Port
+mongodb-server-host-1=localhost:27017

jnosql/pom.xml

@@ -0,0 +1,23 @@
+<?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>
+
+    <groupId>com.baeldung.jnosql</groupId>
+    <artifactId>jnosql</artifactId>
+    <version>1.0-SNAPSHOT</version>
+    <packaging>pom</packaging>
+
+    <properties>
+        <maven.compiler.source>1.8</maven.compiler.source>
+        <maven.compiler.target>1.8</maven.compiler.target>
+        <jnosql.version>0.0.5</jnosql.version>
+    </properties>
+
+    <modules>
+        <module>jnosql-diana</module>
+        <module>jnosql-artemis</module>
+   </modules>
+
+</project>

junit5/README.md

@@ -1,2 +0,0 @@
-## Relevant articles: 
-- [The Order of Tests in JUnit](http://www.baeldung.com/junit-5-test-order)

libraries-data/pom.xml

@@ -141,6 +141,13 @@
             <artifactId>hazelcast</artifactId>
             <version>${hazelcast.version}</version>
         </dependency>
+        
+        <dependency>
+            <groupId>com.googlecode.jmapper-framework</groupId>
+            <artifactId>jmapper-core</artifactId>
+            <version>${jmapper.version}</version>
+        </dependency>
+                
     </dependencies>
 
     <build>
@@ -275,6 +282,7 @@
         <datanucleus-maven-plugin.version>5.0.2</datanucleus-maven-plugin.version>
         <datanucleus-xml.version>5.0.0-release</datanucleus-xml.version>
         <datanucleus-jdo-query.version>5.0.4</datanucleus-jdo-query.version>
+        <jmapper.version>1.6.0.1</jmapper.version>        
     </properties>
 
 </project>

libraries-data/src/main/java/com/baeldung/jmapper/User.java

@@ -0,0 +1,56 @@
+package com.baeldung.jmapper;
+
+import java.time.LocalDate;
+
+
+public class User {
+    
+    private long id;    
+    private String email;
+    private LocalDate birthDate;
+    
+    // constructors
+    
+    public User() {
+        super();
+    }
+    
+    public User(long id, String email, LocalDate birthDate) {
+        super();
+        this.id = id;
+        this.email = email;
+        this.birthDate = birthDate;
+    }
+
+    // getters and setters
+    
+    public long getId() {
+        return id;
+    }
+
+    public void setId(long id) {
+        this.id = id;
+    }
+
+    public String getEmail() {
+        return email;
+    }
+
+    public void setEmail(String email) {
+        this.email = email;
+    }
+
+    public LocalDate getBirthDate() {
+        return birthDate;
+    }
+
+    public void setBirthDate(LocalDate birthDate) {
+        this.birthDate = birthDate;
+    }
+
+    @Override
+    public String toString() {
+        return "User [id=" + id + ", email=" + email + ", birthDate=" + birthDate + "]";
+    }
+    
+}

libraries-data/src/main/java/com/baeldung/jmapper/UserDto.java

@@ -0,0 +1,69 @@
+package com.baeldung.jmapper;
+
+import java.time.LocalDate;
+import java.time.Period;
+
+import com.googlecode.jmapper.annotations.JMap;
+import com.googlecode.jmapper.annotations.JMapConversion;
+
+public class UserDto {
+    
+    @JMap
+    private long id;
+
+    @JMap("email")
+    private String username;
+    
+    @JMap("birthDate")
+    private int age;
+
+    @JMapConversion(from={"birthDate"}, to={"age"})
+    public int conversion(LocalDate birthDate){
+        return Period.between(birthDate, LocalDate.now()).getYears();
+    }
+    
+    // constructors
+    
+    public UserDto() {
+        super();
+    }
+
+    public UserDto(long id, String username, int age) {
+        super();
+        this.id = id;
+        this.username = username;
+        this.age = age;
+    }
+
+   // getters and setters
+    
+    public long getId() {
+        return id;
+    }
+
+    public void setId(long id) {
+        this.id = id;
+    }
+
+    public String getUsername() {
+        return username;
+    }
+
+    public void setUsername(String username) {
+        this.username = username;
+    }
+
+    public int getAge() {
+        return age;
+    }
+
+    public void setAge(int age) {
+        this.age = age;
+    }
+
+    @Override
+    public String toString() {
+        return "UserDto [id=" + id + ", username=" + username + ", age=" + age + "]";
+    }
+    
+}

libraries-data/src/main/java/com/baeldung/jmapper/UserDto1.java

@@ -0,0 +1,47 @@
+package com.baeldung.jmapper;
+
+import com.googlecode.jmapper.annotations.JGlobalMap;
+
+@JGlobalMap
+public class UserDto1 {
+    
+    private long id;
+    private String email;
+    
+    
+    // constructors
+    
+    public UserDto1() {
+        super();
+    }
+
+    public UserDto1(long id, String email) {
+        super();
+        this.id = id;
+        this.email = email;
+    }
+
+   // getters and setters
+    
+    public long getId() {
+        return id;
+    }
+
+    public void setId(long id) {
+        this.id = id;
+    }
+
+    public String getEmail() {
+        return email;
+    }
+
+    public void setEmail(String email) {
+        this.email = email;
+    }
+
+    @Override
+    public String toString() {
+        return "UserDto [id=" + id + ", email=" + email + "]";
+    }
+    
+}

libraries-data/src/main/java/com/baeldung/jmapper/relational/User.java

@@ -0,0 +1,49 @@
+package com.baeldung.jmapper.relational;
+
+import com.googlecode.jmapper.annotations.JMap;
+
+
+public class User {
+    
+    @JMap(classes = {UserDto1.class, UserDto2.class})
+    private long id;    
+    
+    @JMap(attributes = {"username", "email"}, classes = {UserDto1.class, UserDto2.class})
+    private String email;
+    
+    // constructors
+    
+    public User() {
+        super();
+    }
+    
+    public User(long id, String email) {
+        super();
+        this.id = id;
+        this.email = email;
+    }
+
+    // getters and setters
+    
+    public long getId() {
+        return id;
+    }
+
+    public void setId(long id) {
+        this.id = id;
+    }
+
+    public String getEmail() {
+        return email;
+    }
+
+    public void setEmail(String email) {
+        this.email = email;
+    }
+
+    @Override
+    public String toString() {
+        return "User [id=" + id + ", email=" + email + "]";
+    }
+    
+}

libraries-data/src/main/java/com/baeldung/jmapper/relational/UserDto1.java

@@ -0,0 +1,44 @@
+package com.baeldung.jmapper.relational;
+
+
+public class UserDto1 {
+    
+    private long id;
+    private String username;
+    
+    // constructors
+    
+    public UserDto1() {
+        super();
+    }
+
+    public UserDto1(long id, String username) {
+        super();
+        this.id = id;
+        this.username = username;
+    }
+
+   // getters and setters
+    
+    public long getId() {
+        return id;
+    }
+
+    public void setId(long id) {
+        this.id = id;
+    }
+
+    public String getUsername() {
+        return username;
+    }
+
+    public void setUsername(String username) {
+        this.username = username;
+    }
+
+    @Override
+    public String toString() {
+        return "UserDto [id=" + id + ", username=" + username + "]";
+    }
+    
+}

libraries-data/src/main/java/com/baeldung/jmapper/relational/UserDto2.java

@@ -0,0 +1,44 @@
+package com.baeldung.jmapper.relational;
+
+
+public class UserDto2 {
+    
+    private long id;
+    private String email;
+    
+    // constructors
+    
+    public UserDto2() {
+        super();
+    }
+
+    public UserDto2(long id, String email) {
+        super();
+        this.id = id;
+        this.email = email;
+    }
+
+   // getters and setters
+    
+    public long getId() {
+        return id;
+    }
+
+    public void setId(long id) {
+        this.id = id;
+    }
+
+    public String getEmail() {
+        return email;
+    }
+
+    public void setEmail(String email) {
+        this.email = email;
+    }
+
+    @Override
+    public String toString() {
+        return "UserDto2 [id=" + id + ", email=" + email + "]";
+    }
+    
+}

libraries-data/src/main/resources/user_jmapper.xml

@@ -0,0 +1,10 @@
+<jmapper>
+  <class name="com.baeldung.jmapper.UserDto">
+    <attribute name="id">
+      <value name="id"/>
+    </attribute>
+    <attribute name="username">
+      <value name="email"/>
+    </attribute>
+  </class>
+</jmapper>

libraries-data/src/main/resources/user_jmapper1.xml

@@ -0,0 +1,5 @@
+<jmapper>
+  <class name="com.baeldung.jmapper.UserDto1">
+    <global/>
+  </class>
+</jmapper>

libraries-data/src/main/resources/user_jmapper2.xml

@@ -0,0 +1,21 @@
+<jmapper>
+  <class name="com.baeldung.jmapper.relational.User">
+    <attribute name="id">
+      <value name="id"/>
+      <classes>
+        <class name="com.baeldung.jmapper.relational.UserDto1"/>
+        <class name="com.baeldung.jmapper.relational.UserDto2"/>
+      </classes>
+    </attribute>
+    <attribute name="email">
+      <attributes>
+        <attribute name="username"/>
+        <attribute name="email"/>
+      </attributes>
+      <classes>
+        <class name="com.baeldung.jmapper.relational.UserDto1"/>
+        <class name="com.baeldung.jmapper.relational.UserDto2"/>
+      </classes>      
+    </attribute>
+  </class>
+</jmapper>

libraries-data/src/test/java/com/baeldung/jmapper/JMapperIntegrationTest.java

@@ -0,0 +1,114 @@
+package com.baeldung.jmapper;
+
+import static com.googlecode.jmapper.api.JMapperAPI.attribute;
+import static com.googlecode.jmapper.api.JMapperAPI.global;
+import static com.googlecode.jmapper.api.JMapperAPI.mappedClass;
+import static org.junit.Assert.assertEquals;
+import static org.junit.Assert.assertTrue;
+
+import java.time.LocalDate;
+
+import org.junit.Test;
+
+import com.googlecode.jmapper.JMapper;
+import com.googlecode.jmapper.api.JMapperAPI;
+
+public class JMapperIntegrationTest {
+
+    
+    @Test
+    public void givenUser_whenUseAnnotation_thenConverted(){
+        JMapper<UserDto, User> userMapper = new JMapper<>(UserDto.class, User.class);
+        
+        User user = new User(1L,"john@test.com", LocalDate.of(1980,8,20));
+        UserDto result = userMapper.getDestination(user);
+
+        System.out.println(result);
+        assertEquals(user.getId(), result.getId());
+        assertEquals(user.getEmail(), result.getUsername());        
+    }
+    
+    @Test
+    public void givenUser_whenUseGlobalMapAnnotation_thenConverted(){
+        JMapper<UserDto1, User> userMapper= new JMapper<>(UserDto1.class, User.class);
+        
+        User user = new User(1L,"john@test.com", LocalDate.of(1980,8,20));
+        UserDto1 result = userMapper.getDestination(user);
+
+        System.out.println(result);
+        assertEquals(user.getId(), result.getId());
+        assertEquals(user.getEmail(), result.getEmail());        
+    }  
+    
+    @Test
+    public void givenUser_whenUseAnnotationExplicitConversion_thenConverted(){
+        JMapper<UserDto, User> userMapper = new JMapper<>(UserDto.class, User.class);
+        
+        User user = new User(1L,"john@test.com", LocalDate.of(1980,8,20));
+        UserDto result = userMapper.getDestination(user);
+
+        System.out.println(result);
+        assertEquals(user.getId(), result.getId());
+        assertEquals(user.getEmail(), result.getUsername());     
+        assertTrue(result.getAge() > 0);
+    }      
+
+    //======================= XML
+    
+    @Test
+    public void givenUser_whenUseXml_thenConverted(){
+        JMapper<UserDto, User> userMapper = new JMapper<>(UserDto.class, User.class,"user_jmapper.xml");
+        
+        User user = new User(1L,"john@test.com", LocalDate.of(1980,8,20));
+        UserDto result = userMapper.getDestination(user);
+
+        System.out.println(result);
+        assertEquals(user.getId(), result.getId());
+        assertEquals(user.getEmail(), result.getUsername());            
+    }
+    
+    @Test
+    public void givenUser_whenUseXmlGlobal_thenConverted(){
+        JMapper<UserDto1, User> userMapper = new JMapper<>(UserDto1.class, User.class,"user_jmapper1.xml");
+        
+        User user = new User(1L,"john@test.com", LocalDate.of(1980,8,20));
+        UserDto1 result = userMapper.getDestination(user);
+
+        System.out.println(result);
+        assertEquals(user.getId(), result.getId());
+        assertEquals(user.getEmail(), result.getEmail());            
+    }    
+    
+    // ===== API
+    
+    @Test
+    public void givenUser_whenUseApi_thenConverted(){
+        JMapperAPI jmapperApi = new JMapperAPI() .add(mappedClass(UserDto.class)
+                 .add(attribute("id").value("id"))
+                 .add(attribute("username").value("email"))
+            ) ;
+        JMapper<UserDto, User> userMapper = new JMapper<>(UserDto.class, User.class, jmapperApi);
+        
+        User user = new User(1L,"john@test.com", LocalDate.of(1980,8,20));
+        UserDto result = userMapper.getDestination(user);
+
+        System.out.println(result);
+        assertEquals(user.getId(), result.getId());
+        assertEquals(user.getEmail(), result.getUsername());
+    }
+    
+    @Test
+    public void givenUser_whenUseApiGlobal_thenConverted(){
+        JMapperAPI jmapperApi = new JMapperAPI() .add(mappedClass(UserDto.class)
+                .add(global())
+            ) ;
+        JMapper<UserDto1, User> userMapper1 = new JMapper<>(UserDto1.class, User.class,jmapperApi);
+        
+        User user = new User(1L,"john@test.com", LocalDate.of(1980,8,20));
+        UserDto1 result = userMapper1.getDestination(user);
+
+        System.out.println(result);
+        assertEquals(user.getId(), result.getId());
+        assertEquals(user.getEmail(), result.getEmail());
+    }
+}

libraries-data/src/test/java/com/baeldung/jmapper/JMapperRelationalIntegrationTest.java

@@ -0,0 +1,76 @@
+package com.baeldung.jmapper;
+
+import static com.googlecode.jmapper.api.JMapperAPI.attribute;
+import static com.googlecode.jmapper.api.JMapperAPI.mappedClass;
+import static org.junit.Assert.assertEquals;
+
+import org.junit.Test;
+
+import com.baeldung.jmapper.relational.User;
+import com.baeldung.jmapper.relational.UserDto1;
+import com.baeldung.jmapper.relational.UserDto2;
+import com.googlecode.jmapper.RelationalJMapper;
+import com.googlecode.jmapper.api.JMapperAPI;
+
+public class JMapperRelationalIntegrationTest {
+
+    
+    @Test
+    public void givenUser_whenUseAnnotation_thenConverted(){
+        RelationalJMapper<User> relationalMapper = new RelationalJMapper<>(User.class);
+        
+        User user = new User(1L,"john@test.com");
+        UserDto1 result1 = relationalMapper.oneToMany(UserDto1.class, user);
+        UserDto2 result2= relationalMapper.oneToMany(UserDto2.class, user);
+
+        System.out.println(result1);
+        System.out.println(result2);
+        assertEquals(user.getId(), result1.getId());
+        assertEquals(user.getEmail(), result1.getUsername());  
+        assertEquals(user.getId(), result2.getId());
+        assertEquals(user.getEmail(), result2.getEmail());          
+    }     
+
+    //======================= XML
+    
+    @Test
+    public void givenUser_whenUseXml_thenConverted(){
+        RelationalJMapper<User> relationalMapper = new RelationalJMapper<>(User.class,"user_jmapper2.xml");
+        
+        User user = new User(1L,"john@test.com");
+        UserDto1 result1 = relationalMapper.oneToMany(UserDto1.class, user);
+        UserDto2 result2 = relationalMapper.oneToMany(UserDto2.class, user);
+
+        System.out.println(result1);
+        System.out.println(result2);
+        assertEquals(user.getId(), result1.getId());
+        assertEquals(user.getEmail(), result1.getUsername());
+        assertEquals(user.getId(), result2.getId());
+        assertEquals(user.getEmail(), result2.getEmail());         
+    }
+    
+    
+    // ===== API
+    
+    @Test
+    public void givenUser_whenUseApi_thenConverted(){
+        JMapperAPI jmapperApi = new JMapperAPI() 
+        .add(mappedClass(User.class)
+            .add(attribute("id").value("id").targetClasses(UserDto1.class,UserDto2.class))
+            .add(attribute("email").targetAttributes("username","email").targetClasses(UserDto1.class,UserDto2.class)) )
+         ;
+        RelationalJMapper<User> relationalMapper = new RelationalJMapper<>(User.class,jmapperApi);
+        
+        User user = new User(1L,"john@test.com");
+        UserDto1 result1 = relationalMapper.oneToMany(UserDto1.class, user);
+        UserDto2 result2 = relationalMapper.oneToMany(UserDto2.class, user);
+
+        System.out.println(result1);
+        System.out.println(result2);
+        assertEquals(user.getId(), result1.getId());
+        assertEquals(user.getEmail(), result1.getUsername());
+        assertEquals(user.getId(), result2.getId());
+        assertEquals(user.getEmail(), result2.getEmail());            
+    }
+
+}