Merge branch 'master' of https://github.com/eugenp/tutorials

.gitignore

@@ -1,4 +1,5 @@
 */bin/*
+bin/
 
 *.class
 
@@ -21,6 +22,9 @@
 *.iws
 out/
 
+# VSCode
+.vscode/
+
 # Mac
 .DS_Store
 

README.md

@@ -32,7 +32,7 @@ Running a Spring Boot module
 ====================
 To run a Spring Boot module run the command: `mvn spring-boot:run` in the module directory
 
-#Running Tests
+###Running Tests
 
 The command `mvn clean install` will run the unit tests in a module.
 To run the integration tests, use the command `mvn clean install -Pintegration-lite-first`

algorithms-miscellaneous-3/README.md

@@ -6,4 +6,4 @@
 - [Practical Java Examples of the Big O Notation](http://www.baeldung.com/java-algorithm-complexity)
 - [Checking If a List Is Sorted in Java](https://www.baeldung.com/java-check-if-list-sorted)
 - [Checking if a Java Graph has a Cycle](https://www.baeldung.com/java-graph-has-a-cycle)
-- [A Guide to the Folding Technique](https://www.baeldung.com/folding-hashing-technique)
+- [A Guide to the Folding Technique in Java](https://www.baeldung.com/folding-hashing-technique)

algorithms-miscellaneous-3/src/main/java/com/baeldung/algorithms/stringsortingbynumber/NaturalOrderComparators.java

@@ -0,0 +1,30 @@
+package com.baeldung.algorithms.stringsortingbynumber;
+
+import java.util.Comparator;
+
+public final class NaturalOrderComparators {
+
+    private static final String DIGIT_AND_DECIMAL_REGEX = "[^\\d.]";
+
+    private NaturalOrderComparators() {
+        throw new AssertionError("Let's keep this static");
+    }
+
+    public static Comparator<String> createNaturalOrderRegexComparator() {
+        return Comparator.comparingDouble(NaturalOrderComparators::parseStringToNumber);
+    }
+
+    private static double parseStringToNumber(String input){
+
+        final String digitsOnly = input.replaceAll(DIGIT_AND_DECIMAL_REGEX, "");
+
+        if("".equals(digitsOnly)) return 0;
+
+        try{
+            return Double.parseDouble(digitsOnly);
+        }catch (NumberFormatException nfe){
+            return 0;
+        }
+    }
+
+}

algorithms-miscellaneous-3/src/test/java/com/baeldung/algorithms/stringsortingbynumber/NaturalOrderComparatorsUnitTest.java

@@ -0,0 +1,79 @@
+package com.baeldung.algorithms.stringsortingbynumber;
+
+import com.baeldung.algorithms.stringsortingbynumber.NaturalOrderComparators;
+import org.junit.Test;
+
+import java.util.ArrayList;
+import java.util.Arrays;
+import java.util.List;
+
+import static org.junit.Assert.*;
+
+public class NaturalOrderComparatorsUnitTest {
+
+    @Test
+    public void givenSimpleStringsContainingIntsAndDoubles_whenSortedByRegex_checkSortingCorrect() {
+
+        List<String> testStrings = Arrays.asList("a1", "b3", "c4", "d2.2", "d2.4", "d2.3d");
+
+        testStrings.sort(NaturalOrderComparators.createNaturalOrderRegexComparator());
+
+        List<String> expected = Arrays.asList("a1", "d2.2", "d2.3d", "d2.4", "b3", "c4");
+
+        assertEquals(expected, testStrings);
+
+
+    }
+
+    @Test
+    public void givenSimpleStringsContainingIntsAndDoublesWithAnInvalidNumber_whenSortedByRegex_checkSortingCorrect() {
+
+        List<String> testStrings = Arrays.asList("a1", "b3", "c4", "d2.2", "d2.4", "d2.3.3d");
+
+        testStrings.sort(NaturalOrderComparators.createNaturalOrderRegexComparator());
+
+        List<String> expected = Arrays.asList("d2.3.3d", "a1", "d2.2", "d2.4", "b3", "c4");
+
+        assertEquals(expected, testStrings);
+
+
+    }
+
+    @Test
+    public void givenAllForseenProblems_whenSortedByRegex_checkSortingCorrect() {
+
+        List<String> testStrings = Arrays.asList("a1", "b3", "c4", "d2.2", "d2.f4", "d2.3.3d");
+
+        testStrings.sort(NaturalOrderComparators.createNaturalOrderRegexComparator());
+
+        List<String> expected = Arrays.asList("d2.3.3d", "a1", "d2.2", "d2.f4", "b3", "c4");
+
+        assertEquals(expected, testStrings);
+
+
+    }
+
+    @Test
+    public void givenComplexStringsContainingSeparatedNumbers_whenSortedByRegex_checkNumbersCondensedAndSorted() {
+
+        List<String> testStrings = Arrays.asList("a1b2c5", "b3ght3.2", "something65.thensomething5"); //125, 33.2, 65.5
+
+        List<String> expected = Arrays.asList("b3ght3.2", "something65.thensomething5", "a1b2c5" );
+
+        testStrings.sort(NaturalOrderComparators.createNaturalOrderRegexComparator());
+
+        assertEquals(expected, testStrings);
+
+    }
+
+    @Test
+    public void givenStringsNotContainingNumbers_whenSortedByRegex_checkOrderNotChanged() {
+
+        List<String> testStrings = Arrays.asList("a", "c", "d", "e");
+        List<String> expected = new ArrayList<>(testStrings);
+
+        testStrings.sort(NaturalOrderComparators.createNaturalOrderRegexComparator());
+
+        assertEquals(expected, testStrings);
+    }
+}

algorithms-sorting/src/main/java/com/baeldung/algorithms/shellsort/ShellSort.java

@@ -0,0 +1,20 @@
+package com.baeldung.algorithms.shellsort;
+
+public class ShellSort {
+
+    public static void sort(int arrayToSort[]) {
+        int n = arrayToSort.length;
+
+        for (int gap = n / 2; gap > 0; gap /= 2) {
+            for (int i = gap; i < n; i++) {
+                int key = arrayToSort[i];
+                int j = i;
+                while (j >= gap && arrayToSort[j - gap] > key) {
+                    arrayToSort[j] = arrayToSort[j - gap];
+                    j -= gap;
+                }
+                arrayToSort[j] = key;
+            }
+        }
+    }
+}

algorithms-sorting/src/test/java/com/baeldung/algorithms/shellsort/ShellSortUnitTest.java

@@ -0,0 +1,17 @@
+package com.baeldung.algorithms.shellsort;
+
+import static org.junit.Assert.*;
+import static org.junit.Assert.assertArrayEquals;
+
+import org.junit.Test;
+
+public class ShellSortUnitTest {
+
+    @Test
+    public void givenUnsortedArray_whenShellSort_thenSortedAsc() {
+        int[] input = {41, 15, 82, 5, 65, 19, 32, 43, 8};
+        ShellSort.sort(input);
+        int[] expected = {5, 8, 15, 19, 32, 41, 43, 65, 82};
+        assertArrayEquals("the two arrays are not equal", expected, input);
+    }
+}

apache-olingo/olingo2/pom.xml

@@ -82,7 +82,6 @@
 	</build>
 
 	<properties>
-		<java.version>1.8</java.version>
 		<olingo2.version>2.0.11</olingo2.version>
 	</properties>
 

aws/pom.xml

@@ -112,7 +112,6 @@
     </repositories>
 
     <properties>
-        <commons-io.version>2.5</commons-io.version>
         <aws-lambda-java-events.version>1.3.0</aws-lambda-java-events.version>
         <aws-lambda-java-core.version>1.1.0</aws-lambda-java-core.version>
         <gson.version>2.8.0</gson.version>

axon/pom.xml

@@ -18,12 +18,6 @@
             <groupId>org.axonframework</groupId>
             <artifactId>axon-spring-boot-starter</artifactId>
             <version>${axon.version}</version>
-            <exclusions>
-                <exclusion>
-                    <groupId>org.axonframework</groupId>
-                    <artifactId>axon-server-connector</artifactId>
-                </exclusion>
-            </exclusions>
         </dependency>
 
         <dependency>
@@ -58,7 +52,7 @@
     </dependencies>
 
     <properties>
-        <axon.version>4.0.3</axon.version>
+        <axon.version>4.1.2</axon.version>
     </properties>
 
 </project>

axon/src/main/java/com/baeldung/axon/commandmodel/OrderAggregate.java

@@ -13,6 +13,7 @@ import com.baeldung.axon.coreapi.commands.ShipOrderCommand;
 import com.baeldung.axon.coreapi.events.OrderConfirmedEvent;
 import com.baeldung.axon.coreapi.events.OrderPlacedEvent;
 import com.baeldung.axon.coreapi.events.OrderShippedEvent;
+import com.baeldung.axon.coreapi.exceptions.UnconfirmedOrderException;
 
 @Aggregate
 public class OrderAggregate {
@@ -34,7 +35,7 @@ public class OrderAggregate {
     @CommandHandler
     public void handle(ShipOrderCommand command) {
         if (!orderConfirmed) {
-            throw new IllegalStateException("Cannot ship an order which has not been confirmed yet.");
+            throw new UnconfirmedOrderException();
         }
 
         apply(new OrderShippedEvent(orderId));
@@ -43,12 +44,12 @@ public class OrderAggregate {
     @EventSourcingHandler
     public void on(OrderPlacedEvent event) {
         this.orderId = event.getOrderId();
-        orderConfirmed = false;
+        this.orderConfirmed = false;
     }
 
     @EventSourcingHandler
     public void on(OrderConfirmedEvent event) {
-        orderConfirmed = true;
+        this.orderConfirmed = true;
     }
 
     protected OrderAggregate() {

axon/src/main/java/com/baeldung/axon/coreapi/exceptions/UnconfirmedOrderException.java

@@ -0,0 +1,8 @@
+package com.baeldung.axon.coreapi.exceptions;
+
+public class UnconfirmedOrderException extends IllegalStateException {
+
+    public UnconfirmedOrderException() {
+        super("Cannot ship an order which has not been confirmed yet.");
+    }
+}

axon/src/main/java/com/baeldung/axon/querymodel/OrderedProductsEventHandler.java

@@ -5,6 +5,7 @@ import java.util.HashMap;
 import java.util.List;
 import java.util.Map;
 
+import org.axonframework.config.ProcessingGroup;
 import org.axonframework.eventhandling.EventHandler;
 import org.axonframework.queryhandling.QueryHandler;
 import org.springframework.stereotype.Service;
@@ -16,6 +17,7 @@ import com.baeldung.axon.coreapi.queries.FindAllOrderedProductsQuery;
 import com.baeldung.axon.coreapi.queries.OrderedProduct;
 
 @Service
+@ProcessingGroup("ordered-products")
 public class OrderedProductsEventHandler {
 
     private final Map<String, OrderedProduct> orderedProducts = new HashMap<>();

axon/src/main/resources/application.properties

@@ -0,0 +1 @@
+spring.application.name=Order Management Service

axon/src/test/java/com/baeldung/axon/commandmodel/OrderAggregateUnitTest.java

@@ -2,6 +2,7 @@ package com.baeldung.axon.commandmodel;
 
 import java.util.UUID;
 
+import com.baeldung.axon.coreapi.exceptions.UnconfirmedOrderException;
 import org.axonframework.test.aggregate.AggregateTestFixture;
 import org.axonframework.test.aggregate.FixtureConfiguration;
 import org.junit.*;
@@ -41,12 +42,12 @@ public class OrderAggregateUnitTest {
     }
 
     @Test
-    public void givenOrderPlacedEvent_whenShipOrderCommand_thenShouldThrowIllegalStateException() {
+    public void givenOrderPlacedEvent_whenShipOrderCommand_thenShouldThrowUnconfirmedOrderException() {
         String orderId = UUID.randomUUID().toString();
         String product = "Deluxe Chair";
         fixture.given(new OrderPlacedEvent(orderId, product))
                .when(new ShipOrderCommand(orderId))
-               .expectException(IllegalStateException.class);
+               .expectException(UnconfirmedOrderException.class);
     }
 
     @Test

core-groovy-2/pom.xml

@@ -175,8 +175,6 @@
         <junit.platform.version>1.0.0</junit.platform.version>
         <hsqldb.version>2.4.0</hsqldb.version>
         <spock-core.version>1.1-groovy-2.4</spock-core.version>
-        <commons-lang3.version>3.9</commons-lang3.version>
-        <java.version>1.8</java.version>
         <maven-compiler-plugin.version>3.8.1</maven-compiler-plugin.version>
         <logback.version>1.2.3</logback.version>
         <groovy.version>2.5.7</groovy.version>

core-groovy-2/src/main/groovy/com/baeldung/concatenate/Wonder.groovy

@@ -0,0 +1,52 @@
+package com.baeldung.concatenate
+
+class Wonder {
+
+    String numOfWonder = 'seven'
+
+    String operator_plus() {
+        return 'The ' + numOfWonder + ' wonders of the world'
+    }
+
+    String operator_left() {
+        return 'The ' << numOfWonder << ' wonders of ' << 'the world'
+    }
+
+    String interpolation_one() {
+        return "The $numOfWonder wonders of the world"
+
+    }
+
+    String interpolation_two() {
+        return "The ${numOfWonder} wonders of the world"
+    }
+
+    String multilineString() {
+        return """
+            There are $numOfWonder wonders of the world.
+            Can you name them all? 
+            1. The Great Pyramid of Giza
+            2. Hanging Gardens of Babylon
+            3. Colossus of Rhode
+            4. Lighthouse of Alexendra
+            5. Temple of Artemis
+            6. Status of Zeus at Olympia
+            7. Mausoleum at Halicarnassus
+        """
+    }
+
+    String method_concat() {
+        return 'The '.concat(numOfWonder).concat(' wonders of the world')
+
+    }
+
+    String method_builder() {
+        return new StringBuilder()
+                .append('The ').append(numOfWonder).append(' wonders of the world')
+    }
+
+    String method_buffer() {
+        return new StringBuffer()
+                .append('The ').append(numOfWonder).append(' wonders of the world')
+    }
+}

core-groovy-2/src/test/groovy/com/baeldung/concatenate/WonderUnitTest.groovy

@@ -0,0 +1,69 @@
+package com.baeldung.concatenate
+
+import org.junit.Before
+import org.junit.Test
+
+import static org.junit.Assert.*
+
+class WonderUnitTest {
+
+    static final String EXPECTED_SINGLE_LINE = "The seven wonders of the world"
+
+    Wonder wonder
+
+    @Before
+    void before() {
+        wonder = new Wonder()
+    }
+
+    @Test
+    void whenUsingOperatorPlus_thenConcatCorrectly() {
+        assertEquals(EXPECTED_SINGLE_LINE, wonder.operator_plus())
+    }
+
+    @Test
+    void whenUsingOperatorLeft_thenConcatCorrectly() {
+        assertEquals(EXPECTED_SINGLE_LINE, wonder.operator_left())
+    }
+
+    @Test
+    void whenUsingInterpolationOne_thenConcatCorrectly() {
+        assertEquals(EXPECTED_SINGLE_LINE, wonder.interpolation_one())
+    }
+
+    @Test
+    void whenUsingInterpolationTwo_thenConcatCorrectly() {
+        assertEquals(EXPECTED_SINGLE_LINE, wonder.interpolation_two())
+    }
+
+    @Test
+    void whenUsingMultiline_thenConcatCorrectly() {
+        def expectedMultiline = """
+            There are seven wonders of the world.
+            Can you name them all? 
+            1. The Great Pyramid of Giza
+            2. Hanging Gardens of Babylon
+            3. Colossus of Rhode
+            4. Lighthouse of Alexendra
+            5. Temple of Artemis
+            6. Status of Zeus at Olympia
+            7. Mausoleum at Halicarnassus
+        """
+        assertEquals(expectedMultiline, wonder.multilineString())
+    }
+
+    @Test
+    void whenUsingMethodConcat_thenConcatCorrectly() {
+        assertEquals(EXPECTED_SINGLE_LINE, wonder.method_concat())
+    }
+
+    @Test
+    void whenUsingMethodBuilder_thenConcatCorrectly() {
+        assertEquals(EXPECTED_SINGLE_LINE, wonder.method_builder())
+    }
+
+    @Test
+    void whenUsingMethodBuffer_thenConcatCorrectly() {
+        assertEquals(EXPECTED_SINGLE_LINE, wonder.method_buffer())
+    }
+}

core-java-arrays/src/main/java/com/baeldung/array/looping/LoopDiagonally.java

@@ -0,0 +1,45 @@
+package com.baeldung.array.looping;
+
+public class LoopDiagonally {
+
+
+    public String loopDiagonally(String[][] twoDArray) {
+
+        int length = twoDArray.length;
+        int diagonalLines = (length + length) - 1;
+        int itemsInDiagonal = 0;
+        int midPoint = (diagonalLines / 2) + 1;
+        StringBuilder output = new StringBuilder();
+
+        for (int i = 1; i <= diagonalLines; i++) {
+
+            StringBuilder items = new StringBuilder();
+            int rowIndex;
+            int columnIndex;
+
+            if (i <= midPoint) {
+                itemsInDiagonal++;
+                for (int j = 0; j < itemsInDiagonal; j++) {
+                    rowIndex = (i - j) - 1;
+                    columnIndex = j;
+                    items.append(twoDArray[rowIndex][columnIndex]);
+                }
+            } else {
+                itemsInDiagonal--;
+                for (int j = 0; j < itemsInDiagonal; j++) {
+                    rowIndex = (length - 1) - j;
+                    columnIndex = (i - length) + j;
+                    items.append(twoDArray[rowIndex][columnIndex]);
+                }
+            }
+
+            if (i != diagonalLines) {
+                output.append(items).append(" ");
+            } else {
+                output.append(items);
+            }
+        }
+
+        return output.toString();
+    }
+}

core-java-arrays/src/test/java/com/baeldung/array/looping/LoopDiagonallyTest.java

@@ -0,0 +1,20 @@
+package com.baeldung.array.looping;
+
+import org.junit.Test;
+
+import static org.junit.Assert.assertEquals;
+
+public class LoopDiagonallyTest {
+
+    @Test
+    public void twoArrayIsLoopedDiagonallyAsExpected() {
+
+        LoopDiagonally loopDiagonally = new LoopDiagonally();
+        String[][] twoDArray = {{"a", "b", "c"},
+                                {"d", "e", "f"},
+                                {"g", "h", "i"}};
+
+        String output = loopDiagonally.loopDiagonally(twoDArray);
+        assertEquals("a db gec hf i", output);
+    }
+}

core-java-modules/core-java-11/src/main/java/com/baeldung/predicate/not/README.md

@@ -0,0 +1,3 @@
+## Relevant articles:
+
+- [Negate a Predicate Method Reference with Java 11](https://www.baeldung.com/java-negate-predicate-method-reference)

core-java-modules/core-java-12/README.md

@@ -0,0 +1,3 @@
+## Relevant articles:
+
+- [String API Updates in Java 12](https://www.baeldung.com/java12-string-api)

core-java-modules/core-java-8/pom.xml

@@ -175,7 +175,6 @@
 
     <properties>
         <!-- util -->
-        <commons-lang3.version>3.5</commons-lang3.version>
         <commons-math3.version>3.6.1</commons-math3.version>
         <commons-collections4.version>4.1</commons-collections4.version>
         <collections-generic.version>4.01</collections-generic.version>

core-java-modules/core-java-8/src/main/java/com/baeldung/java_8_features/groupingby/Tuple.java

@@ -0,0 +1,34 @@
+package com.baeldung.java_8_features.groupingby;
+
+public class Tuple {
+
+    private BlogPostType type;
+    private String author;
+    
+    public Tuple(BlogPostType type, String author) {
+        super();
+        this.type = type;
+        this.author = author;
+    }
+
+    public BlogPostType getType() {
+        return type;
+    }
+
+    public void setType(BlogPostType type) {
+        this.type = type;
+    }
+
+    public String getAuthor() {
+        return author;
+    }
+
+    public void setAuthor(String author) {
+        this.author = author;
+    }
+
+    @Override
+    public String toString() {
+        return "Tuple [type=" + type + ", author=" + author + ", getType()=" + getType() + ", getAuthor()=" + getAuthor() + ", getClass()=" + getClass() + ", hashCode()=" + hashCode() + ", toString()=" + super.toString() + "]";
+    }
+}

core-java-modules/core-java-8/src/test/java/com/baeldung/java8/optional/OptionalUnitTest.java

@@ -259,4 +259,15 @@ public class OptionalUnitTest {
         LOG.debug("Getting default value...");
         return "Default Value";
     }
+    
+//    Uncomment code when code base is compatiable with Java 11     
+//    @Test
+//    public void givenAnEmptyOptional_thenIsEmptyBehavesAsExpected() {
+//        Optional<String> opt = Optional.of("Baeldung");
+//        assertFalse(opt.isEmpty());
+//     
+//        opt = Optional.ofNullable(null);
+//        assertTrue(opt.isEmpty());
+//    }
+
 }

core-java-modules/core-java-arrays/src/main/java/com/baeldung/array/SortedArrayChecker.java

@@ -2,7 +2,10 @@ package com.baeldung.array;
 
 import com.baeldung.arraycopy.model.Employee;
 
+import java.util.Comparator;
+
 public class SortedArrayChecker {
+
     boolean isSorted(int[] array, int length) {
         if (array == null || length < 2)
             return true;
@@ -22,7 +25,7 @@ public class SortedArrayChecker {
         return true;
     }
 
-    boolean isSorted(String[] array, int length) {
+    boolean isSorted(Comparable[] array, int length) {
         if (array == null || length < 2)
             return true;
 
@@ -32,40 +35,31 @@ public class SortedArrayChecker {
         return isSorted(array, length - 1);
     }
 
-boolean isSorted(String[] array) {
-    for (int i = 0; i < array.length - 1; ++i) {
-        if (array[i].compareTo(array[i + 1]) > 0)
-            return false;
-    }
-
-    return true;
-}
-
-    boolean isSortedByName(Employee[] array) {
+    boolean isSorted(Comparable[] array) {
         for (int i = 0; i < array.length - 1; ++i) {
-            if (array[i].getName().compareTo(array[i + 1].getName()) > 0)
+            if (array[i].compareTo(array[i + 1]) > 0)
                 return false;
         }
 
         return true;
     }
 
-boolean isSortedByAge(Employee[] array) {
-    for (int i = 0; i < array.length - 1; ++i) {
-        if (array[i].getAge() > (array[i + 1].getAge()))
-            return false;
+    boolean isSorted(Object[] array, Comparator comparator) {
+        for (int i = 0; i < array.length - 1; ++i) {
+            if (comparator.compare(array[i], (array[i + 1])) > 0)
+                return false;
+        }
+
+        return true;
     }
 
-    return true;
-}
-
-    boolean isSortedByAge(Employee[] array, int length) {
+    boolean isSorted(Object[] array, Comparator comparator, int length) {
         if (array == null || length < 2)
             return true;
 
-        if (array[length - 2].getAge() > array[length - 1].getAge())
+        if (comparator.compare(array[length - 2], array[length - 1]) > 0)
             return false;
 
-        return isSortedByAge(array, length - 1);
+        return isSorted(array, comparator, length - 1);
     }
 }

core-java-modules/core-java-arrays/src/test/java/com/baeldung/array/SortedArrayCheckerUnitTest.java

@@ -4,32 +4,33 @@ import com.baeldung.arraycopy.model.Employee;
 import org.junit.Before;
 import org.junit.Test;
 
+import java.util.Comparator;
+
 import static org.assertj.core.api.Assertions.assertThat;
 
-class SortedArrayCheckerUnitTest {
-
+public class SortedArrayCheckerUnitTest {
     private static final int[] INTEGER_SORTED = {1, 3, 5, 7, 9};
     private static final int[] INTEGER_NOT_SORTED = {1, 3, 11, 7};
 
     private static final String[] STRING_SORTED = {"abc", "cde", "fgh"};
     private static final String[] STRING_NOT_SORTED = {"abc", "fgh", "cde", "ijk"};
 
-    private final Employee[] EMPLOYEES_SORTED_BY_NAME = {
+    private static final Employee[] EMPLOYEES_SORTED_BY_NAME = {
             new Employee(1, "Carlos", 26),
             new Employee(2, "Daniel", 31),
             new Employee(3, "Marta", 27)};
 
-    private final Employee[] EMPLOYEES_NOT_SORTED_BY_NAME = {
+    private static final Employee[] EMPLOYEES_NOT_SORTED_BY_NAME = {
             new Employee(1, "Daniel", 31),
             new Employee(2, "Carlos", 26),
             new Employee(3, "Marta", 27)};
 
-    private final Employee[] EMPLOYEES_SORTED_BY_AGE = {
+    private static final Employee[] EMPLOYEES_SORTED_BY_AGE = {
             new Employee(1, "Carlos", 26),
             new Employee(2, "Marta", 27),
             new Employee(3, "Daniel", 31)};
 
-    private final Employee[] EMPLOYEES_NOT_SORTED_BY_AGE = {
+    private static final Employee[] EMPLOYEES_NOT_SORTED_BY_AGE = {
             new Employee(1, "Marta", 27),
             new Employee(2, "Carlos", 26),
             new Employee(3, "Daniel", 31)};
@@ -61,13 +62,18 @@ class SortedArrayCheckerUnitTest {
 
     @Test
     public void givenEmployeeArray_thenReturnIfItIsSortedOrNot() {
-        assertThat(sortedArrayChecker.isSortedByName(EMPLOYEES_SORTED_BY_NAME)).isEqualTo(true);
-        assertThat(sortedArrayChecker.isSortedByName(EMPLOYEES_NOT_SORTED_BY_NAME)).isEqualTo(false);
+        assertThat(sortedArrayChecker.isSorted(EMPLOYEES_SORTED_BY_NAME, Comparator.comparing(Employee::getName))).isEqualTo(true);
+        assertThat(sortedArrayChecker.isSorted(EMPLOYEES_NOT_SORTED_BY_NAME, Comparator.comparing(Employee::getName))).isEqualTo(false);
 
-        assertThat(sortedArrayChecker.isSortedByAge(EMPLOYEES_SORTED_BY_AGE)).isEqualTo(true);
-        assertThat(sortedArrayChecker.isSortedByAge(EMPLOYEES_NOT_SORTED_BY_AGE)).isEqualTo(false);
+        assertThat(sortedArrayChecker.isSorted(EMPLOYEES_SORTED_BY_AGE, Comparator.comparingInt(Employee::getAge))).isEqualTo(true);
+        assertThat(sortedArrayChecker.isSorted(EMPLOYEES_NOT_SORTED_BY_AGE, Comparator.comparingInt(Employee::getAge))).isEqualTo(false);
 
-        assertThat(sortedArrayChecker.isSortedByAge(EMPLOYEES_SORTED_BY_AGE, EMPLOYEES_SORTED_BY_AGE.length)).isEqualTo(true);
-        assertThat(sortedArrayChecker.isSortedByAge(EMPLOYEES_NOT_SORTED_BY_AGE, EMPLOYEES_NOT_SORTED_BY_AGE.length)).isEqualTo(false);
+        assertThat(sortedArrayChecker
+                .isSorted(EMPLOYEES_SORTED_BY_AGE, Comparator.comparingInt(Employee::getAge), EMPLOYEES_SORTED_BY_AGE.length))
+                .isEqualTo(true);
+        assertThat(sortedArrayChecker
+                .isSorted(EMPLOYEES_NOT_SORTED_BY_AGE, Comparator.comparingInt(Employee::getAge), EMPLOYEES_NOT_SORTED_BY_AGE.length))
+                .isEqualTo(false);
     }
+
 }

core-java-modules/core-java-collections-array-list/src/test/java/org/baeldung/java/collections/CoreJavaCollectionsUnitTest.java

@@ -42,7 +42,7 @@ public class CoreJavaCollectionsUnitTest {
     @Test(expected = UnsupportedOperationException.class)
     public final void givenUsingGuavaBuilder_whenUnmodifiableListIsCreatedFromOriginal_thenNoLongerModifiable() {
         final List<String> list = new ArrayList<String>(Arrays.asList("one", "two", "three"));
-        final ImmutableList<Object> unmodifiableList = ImmutableList.builder().addAll(list).build();
+        final ImmutableList<String> unmodifiableList = ImmutableList.<String>builder().addAll(list).build();
         unmodifiableList.add("four");
     }
 

core-java-modules/core-java-concurrency-advanced/pom.xml

@@ -72,7 +72,6 @@
     <properties>
         <!-- util -->
         <guava.version>21.0</guava.version>
-        <commons-lang3.version>3.5</commons-lang3.version>
         <commons-math3.version>3.6.1</commons-math3.version>
         <commons-collections4.version>4.1</commons-collections4.version>
         <collections-generic.version>4.01</collections-generic.version>

core-java-modules/core-java-concurrency-basic/README.md

@@ -17,3 +17,4 @@
 - [Runnable vs. Callable in Java](http://www.baeldung.com/java-runnable-callable)
 - [What is Thread-Safety and How to Achieve it?](https://www.baeldung.com/java-thread-safety)
 - [How to Start a Thread in Java](https://www.baeldung.com/java-start-thread)
+- [How to Delay Code Execution in Java](https://www.baeldung.com/java-delay-code-execution)

core-java-modules/core-java-concurrency-basic/pom.xml

@@ -45,8 +45,6 @@
     </build>
 
     <properties>
-        <!-- util -->
-        <commons-lang3.version>3.5</commons-lang3.version>
         <!-- testing -->
         <assertj.version>3.6.1</assertj.version>
         <avaitility.version>1.7.0</avaitility.version>

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

@@ -62,7 +62,6 @@
     <properties>
         <!-- util -->
         <guava.version>21.0</guava.version>
-        <commons-lang3.version>3.5</commons-lang3.version>
         <commons-math3.version>3.6.1</commons-math3.version>
         <commons-collections4.version>4.1</commons-collections4.version>
         <collections-generic.version>4.01</collections-generic.version>

core-java-modules/core-java-exceptions/README.md

@@ -0,0 +1,3 @@
+## Relevant articles:
+
+- [Will an Error Be Caught by Catch Block in Java?](https://www.baeldung.com/java-error-catch)

core-java-modules/core-java-io/pom.xml

@@ -248,7 +248,6 @@
     <properties>
 
         <!-- util -->
-        <commons-lang3.version>3.5</commons-lang3.version>
         <bouncycastle.version>1.55</bouncycastle.version>
         <commons-codec.version>1.10</commons-codec.version>
         <commons-math3.version>3.6.1</commons-math3.version>

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

@@ -35,7 +35,6 @@
     </dependencies>
 
     <properties>
-        <commons-lang3.version>3.5</commons-lang3.version>
         <assertj.version>3.6.1</assertj.version>
     </properties>
 </project>

core-java-modules/core-java-lambdas/README.md

@@ -0,0 +1,3 @@
+## Relevant articles:
+
+- [Why Do Local Variables Used in Lambdas Have to Be Final or Effectively Final?](https://www.baeldung.com/java-lambda-effectively-final-local-variables)

core-java-modules/core-java-lang-oop/pom.xml

@@ -75,13 +75,7 @@
     </build>
 
     <properties>
-        
-        <!-- marshalling -->
-        <jackson.version>2.8.5</jackson.version>
         <gson.version>2.8.2</gson.version>
-
-        <!-- util -->
-        <commons-lang3.version>3.5</commons-lang3.version>
         <!-- testing -->
         <assertj-core.version>3.10.0</assertj-core.version>
         <equalsverifier.version>3.0.3</equalsverifier.version>

core-java-modules/core-java-lang-oop/src/main/java/com/baeldung/constructors/BankAccount.java

@@ -54,3 +54,15 @@ class BankAccountCopyConstructor extends BankAccount {
         this.balance = 0.0f;
     }
 }
+
+class BankAccountChainedConstructors extends BankAccount {
+    public BankAccountChainedConstructors(String name, LocalDateTime opened, double balance) {
+        this.name = name;
+        this.opened = opened;
+        this.balance = balance;
+    }
+
+    public BankAccountChainedConstructors(String name) {
+        this(name, LocalDateTime.now(), 0.0f);
+    }
+}

core-java-modules/core-java-lang-oop/src/test/java/com/baeldung/constructors/ConstructorUnitTest.java

@@ -1,15 +1,14 @@
 package com.baeldung.constructors;
 
-import com.baeldung.constructors.*;
+import com.google.common.collect.Comparators;
+import org.junit.Test;
 
-import java.util.logging.Logger;
 import java.time.LocalDateTime;
 import java.time.Month;
+import java.util.ArrayList;
+import java.util.logging.Logger;
 
-import org.junit.Test;
-import static org.assertj.core.api.Assertions.assertThat;
-import static org.assertj.core.api.Assertions.assertThatCode;
-import static org.assertj.core.api.Assertions.assertThatThrownBy;
+import static org.assertj.core.api.Assertions.*;
 
 public class ConstructorUnitTest {
     final static Logger LOGGER = Logger.getLogger(ConstructorUnitTest.class.getName());
@@ -17,26 +16,28 @@ public class ConstructorUnitTest {
     @Test
     public void givenNoExplicitContructor_whenUsed_thenFails() {
         BankAccount account = new BankAccount();
-        assertThatThrownBy(() -> { account.toString(); }).isInstanceOf(Exception.class);
+        assertThatThrownBy(() -> {
+            account.toString();
+        }).isInstanceOf(Exception.class);
     }
 
     @Test
     public void givenNoArgumentConstructor_whenUsed_thenSucceeds() {
         BankAccountEmptyConstructor account = new BankAccountEmptyConstructor();
         assertThatCode(() -> {
-                account.toString();
-            }).doesNotThrowAnyException();
+            account.toString();
+        }).doesNotThrowAnyException();
     }
 
     @Test
     public void givenParameterisedConstructor_whenUsed_thenSucceeds() {
         LocalDateTime opened = LocalDateTime.of(2018, Month.JUNE, 29, 06, 30, 00);
         BankAccountParameterizedConstructor account =
-            new BankAccountParameterizedConstructor("Tom", opened, 1000.0f);
-        
+                new BankAccountParameterizedConstructor("Tom", opened, 1000.0f);
+
         assertThatCode(() -> {
-                account.toString();
-            }).doesNotThrowAnyException();
+            account.toString();
+        }).doesNotThrowAnyException();
     }
 
     @Test
@@ -47,7 +48,16 @@ public class ConstructorUnitTest {
 
         assertThat(account.getName()).isEqualTo(newAccount.getName());
         assertThat(account.getOpened()).isNotEqualTo(newAccount.getOpened());
-        
+
         assertThat(newAccount.getBalance()).isEqualTo(0.0f);
     }
+
+    @Test
+    public void givenChainedConstructor_whenUsed_thenMaintainsLogic() {
+        BankAccountChainedConstructors account = new BankAccountChainedConstructors("Tim");
+        BankAccountChainedConstructors newAccount = new BankAccountChainedConstructors("Tim", LocalDateTime.now(), 0.0f);
+
+        assertThat(account.getName()).isEqualTo(newAccount.getName());
+        assertThat(account.getBalance()).isEqualTo(newAccount.getBalance());
+    }
 }

core-java-modules/core-java-lang/README.md

@@ -18,7 +18,6 @@
 - [A Guide to Inner Interfaces in Java](http://www.baeldung.com/java-inner-interfaces)
 - [Recursion In Java](http://www.baeldung.com/java-recursion)
 - [A Guide to the finalize Method in Java](http://www.baeldung.com/java-finalize)
-- [A Guide to Java Enums](http://www.baeldung.com/a-guide-to-java-enums)
 - [Infinite Loops in Java](http://www.baeldung.com/infinite-loops-java)
 - [Quick Guide to java.lang.System](http://www.baeldung.com/java-lang-system)
 - [Using Java Assertions](http://www.baeldung.com/java-assert)

core-java-modules/core-java-lang/pom.xml

@@ -75,9 +75,6 @@
 
     <properties>
         <gson.version>2.8.2</gson.version>
-
-        <!-- util -->
-        <commons-lang3.version>3.5</commons-lang3.version>
         
         <javax.mail.version>1.5.0-b01</javax.mail.version>
         

core-java-modules/core-java-networking-2/.gitignore

@@ -0,0 +1,25 @@
+*.class
+
+0.*
+
+#folders#
+/target
+/neoDb*
+/data
+/src/main/webapp/WEB-INF/classes
+*/META-INF/*
+.resourceCache
+
+# Packaged files #
+*.jar
+*.war
+*.ear
+
+# Files generated by integration tests
+backup-pom.xml
+/bin/
+/temp
+
+#IntelliJ specific
+.idea/
+*.iml

core-java-modules/core-java-networking-2/pom.xml

@@ -0,0 +1,20 @@
+<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
+    <modelVersion>4.0.0</modelVersion>
+    <artifactId>core-java-networking-2</artifactId>
+    <name>core-java-networking-2</name>
+    <packaging>jar</packaging>
+
+    <parent>
+        <groupId>com.baeldung.core-java-modules</groupId>
+        <artifactId>core-java-modules</artifactId>
+        <version>1.0.0-SNAPSHOT</version>
+    </parent>
+
+    <dependencies>
+    </dependencies>
+
+    <build>
+        <finalName>core-java-networking-2</finalName>
+    </build>	
+</project>

core-java-modules/core-java-networking-2/src/main/java/com/baeldung/url/UrlChecker.java

@@ -0,0 +1,25 @@
+package com.baeldung.url;
+
+import java.io.IOException;
+import java.net.HttpURLConnection;
+import java.net.URL;
+
+public class UrlChecker {
+
+    public int getResponseCodeForURL(String address) throws IOException {
+        return getResponseCodeForURLUsing(address, "GET");
+    }
+
+    public int getResponseCodeForURLUsingHead(String address) throws IOException {
+        return getResponseCodeForURLUsing(address, "HEAD");
+    }
+
+    private int getResponseCodeForURLUsing(String address, String method) throws IOException {
+        HttpURLConnection.setFollowRedirects(false); // Set follow redirects to false
+        final URL url = new URL(address);
+        HttpURLConnection huc = (HttpURLConnection) url.openConnection();
+        huc.setRequestMethod(method);
+        return huc.getResponseCode();
+    }
+
+}

core-java-modules/core-java-networking-2/src/test/java/com/baeldung/url/UrlCheckerUnitTest.java

@@ -0,0 +1,39 @@
+package com.baeldung.url;
+
+import static org.junit.jupiter.api.Assertions.assertEquals;
+
+import java.io.IOException;
+
+import org.junit.Test;
+
+public class UrlCheckerUnitTest {
+
+    @Test
+    public void givenValidUrl_WhenUsingHEAD_ThenReturn200() throws IOException {
+        UrlChecker tester = new UrlChecker();
+        int responseCode = tester.getResponseCodeForURLUsingHead("http://www.example.com");
+        assertEquals(200, responseCode);
+    }
+    
+    @Test
+    public void givenInvalidIUrl_WhenUsingHEAD_ThenReturn404() throws IOException {
+        UrlChecker tester = new UrlChecker();
+        int responseCode = tester.getResponseCodeForURLUsingHead("http://www.example.com/unkownurl");
+        assertEquals(404, responseCode);
+    }
+    
+    @Test
+    public void givenValidUrl_WhenUsingGET_ThenReturn200() throws IOException {
+        UrlChecker tester = new UrlChecker();
+        int responseCode = tester.getResponseCodeForURL("http://www.example.com");
+        assertEquals(200, responseCode);
+    }
+    
+    @Test
+    public void givenInvalidIUrl_WhenUsingGET_ThenReturn404() throws IOException {
+        UrlChecker tester = new UrlChecker();
+        int responseCode = tester.getResponseCodeForURL("http://www.example.com/unkownurl");
+        assertEquals(404, responseCode);
+    }
+    
+}

core-java-modules/core-java-networking/pom.xml

@@ -42,8 +42,6 @@
 
     <properties>
         <javax.mail.version>1.5.0-b01</javax.mail.version>
-        <commons-io.version>2.5</commons-io.version>
-        <commons-lang3.version>3.5</commons-lang3.version>
         <springframework.spring-web.version>4.3.4.RELEASE</springframework.spring-web.version>
     </properties>	
 </project>

core-java-modules/core-java-optional/pom.xml

@@ -19,12 +19,12 @@
         <dependency>
             <groupId>com.h2database</groupId>
             <artifactId>h2</artifactId>
-            <version>${h2database.version}</version>
+            <version>${h2.version}</version>
         </dependency>
         <dependency>
             <groupId>com.fasterxml.jackson.core</groupId>
             <artifactId>jackson-databind</artifactId>
-            <version>${jackson.databind.version}</version>
+            <version>${jackson.version}</version>
         </dependency>
     </dependencies>
 
@@ -48,7 +48,5 @@
         <maven.compiler.source>1.8</maven.compiler.source>
         <maven.compiler.target>1.8</maven.compiler.target>
         <hibernate.core.version>5.4.0.Final</hibernate.core.version>
-        <h2database.version>1.4.197</h2database.version>
-        <jackson.databind.version>2.9.8</jackson.databind.version>
     </properties>
 </project>

core-java-modules/core-java-os/pom.xml

@@ -68,7 +68,6 @@
 
     <properties>
         <!-- util -->
-        <commons-lang3.version>3.5</commons-lang3.version>
         <commons-collections4.version>4.1</commons-collections4.version>
         <collections-generic.version>4.01</collections-generic.version>
     

core-java-modules/core-java-os/src/main/java/com/baeldung/core/pwd/CurrentDirectoryFetcher.java

@@ -0,0 +1,40 @@
+package com.baeldung.core.pwd;
+
+import java.io.File;
+import java.nio.file.FileSystems;
+import java.nio.file.Paths;
+
+public final class CurrentDirectoryFetcher {
+
+    public static void main(String[] args) {
+        System.out.printf("Current Directory Using Java System API: %s%n", currentDirectoryUsingSystemProperties());
+
+        System.out.printf("Current Directory Using Java IO File API: %s%n", currentDirectoryUsingFile());
+
+        System.out.printf("Current Directory Using Java NIO FileSystems API: %s%n", currentDirectoryUsingFileSystems());
+
+        System.out.printf("Current Directory Using Java NIO Paths API: %s%n", currentDirectoryUsingPaths());
+    }
+
+    public static String currentDirectoryUsingSystemProperties() {
+        return System.getProperty("user.dir");
+    }
+
+    public static String currentDirectoryUsingPaths() {
+        return Paths.get("")
+            .toAbsolutePath()
+            .toString();
+    }
+
+    public static String currentDirectoryUsingFileSystems() {
+        return FileSystems.getDefault()
+            .getPath("")
+            .toAbsolutePath()
+            .toString();
+    }
+
+    public static String currentDirectoryUsingFile() {
+        return new File("").getAbsolutePath();
+    }
+
+}

core-java-modules/core-java-os/src/test/java/com/baeldung/core/pwd/CurrentDirectoryFetcherTest.java

@@ -0,0 +1,34 @@
+package com.baeldung.core.pwd;
+
+import static org.junit.Assert.assertTrue;
+
+import org.junit.Test;
+
+public class CurrentDirectoryFetcherTest {
+
+    private static final String CURRENT_DIR = "core-java-os";
+
+    @Test
+    public void whenUsingSystemProperties_thenReturnCurrentDirectory() {
+        assertTrue(CurrentDirectoryFetcher.currentDirectoryUsingSystemProperties()
+            .endsWith(CURRENT_DIR));
+    }
+
+    @Test
+    public void whenUsingJavaNioPaths_thenReturnCurrentDirectory() {
+        assertTrue(CurrentDirectoryFetcher.currentDirectoryUsingPaths()
+            .endsWith(CURRENT_DIR));
+    }
+
+    @Test
+    public void whenUsingJavaNioFileSystems_thenReturnCurrentDirectory() {
+        assertTrue(CurrentDirectoryFetcher.currentDirectoryUsingFileSystems()
+            .endsWith(CURRENT_DIR));
+    }
+
+    @Test
+    public void whenUsingJavaIoFile_thenReturnCurrentDirectory() {
+        assertTrue(CurrentDirectoryFetcher.currentDirectoryUsingFile()
+            .endsWith(CURRENT_DIR));
+    }
+}

core-java-modules/core-java-perf/pom.xml

@@ -23,11 +23,4 @@
        
     </dependencies>
 
-    <properties>
-
-        <!-- util -->
-        <commons-lang3.version>3.8.1</commons-lang3.version>
-      
-    </properties>
-
 </project>

core-java-modules/core-java-security/pom.xml

@@ -43,7 +43,6 @@
     <properties>
 
         <!-- util -->
-        <commons-lang3.version>3.8.1</commons-lang3.version>
         <bouncycastle.version>1.60</bouncycastle.version>
         <commons-codec.version>1.11</commons-codec.version>
 

core-java-modules/core-java-sun/pom.xml

@@ -264,7 +264,6 @@
 
         <!-- util -->
         <guava.version>23.0</guava.version>
-        <commons-lang3.version>3.5</commons-lang3.version>
         <bouncycastle.version>1.55</bouncycastle.version>
         <commons-codec.version>1.10</commons-codec.version>
         <commons-math3.version>3.6.1</commons-math3.version>

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

@@ -37,7 +37,6 @@
 - [Common Java Exceptions](http://www.baeldung.com/java-common-exceptions)
 - [Throw Exception in Optional in Java 8](https://www.baeldung.com/java-optional-throw-exception)
 - [Merging java.util.Properties Objects](https://www.baeldung.com/java-merging-properties)
-- [Merging java.util.Properties Objects](https://www.baeldung.com/java-merging-properties)
 - [Java – Try with Resources](https://www.baeldung.com/java-try-with-resources)
 - [Abstract Classes in Java](https://www.baeldung.com/java-abstract-class)
 - [Guide to Character Encoding](https://www.baeldung.com/java-char-encoding)

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

@@ -113,7 +113,7 @@
         <dependency>
             <groupId>com.h2database</groupId>
             <artifactId>h2</artifactId>
-            <version>${h2database.version}</version>
+            <version>${h2.version}</version>
         </dependency>
         <!-- instrumentation -->
         <dependency>
@@ -453,8 +453,6 @@
         <gson.version>2.8.2</gson.version>
 
         <!-- util -->
-        <commons-lang3.version>3.9</commons-lang3.version>
-        <commons-io.version>2.5</commons-io.version>
         <commons-math3.version>3.6.1</commons-math3.version>
         <decimal4j.version>1.0.3</decimal4j.version>
         <unix4j.version>0.4</unix4j.version>
@@ -471,7 +469,6 @@
         <maven-surefire-plugin.version>2.21.0</maven-surefire-plugin.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>
        

core-java-modules/pom.xml

@@ -17,6 +17,7 @@
         <module>pre-jpms</module>
         <module>core-java-exceptions</module>
         <module>core-java-optional</module>
+        <module>core-java-networking-2</module>
     </modules>
     
 </project>

core-kotlin-io/pom.xml

@@ -22,7 +22,7 @@
         <dependency>
             <groupId>org.junit.jupiter</groupId>
             <artifactId>junit-jupiter</artifactId>
-            <version>${junit.jupiter.version}</version>
+            <version>${junit-jupiter.version}</version>
             <scope>test</scope>
         </dependency>
         <dependency>
@@ -88,7 +88,7 @@
 
     <properties>
         <kotlin.version>1.3.30</kotlin.version>
-        <junit.jupiter.version>5.4.2</junit.jupiter.version>
+        <junit-jupiter.version>5.4.2</junit-jupiter.version>
         <mockito.version>2.27.0</mockito.version>
         <byte-buddy.version>1.9.12</byte-buddy.version>
         <assertj.version>3.10.0</assertj.version>

core-kotlin/pom.xml

@@ -39,7 +39,7 @@
         <dependency>
             <groupId>com.h2database</groupId>
             <artifactId>h2</artifactId>
-            <version>${h2database.version}</version>
+            <version>${h2.version}</version>
         </dependency>
         <dependency>
             <groupId>com.github.kittinunf.fuel</groupId>
@@ -76,11 +76,9 @@
 
     <properties>
         <commons-math3.version>3.6.1</commons-math3.version>
-        <commons-lang3.version>3.8.1</commons-lang3.version>
         <junit.platform.version>1.1.1</junit.platform.version>
         <junit.vintage.version>5.2.0</junit.vintage.version>
         <assertj.version>3.10.0</assertj.version>
-        <h2database.version>1.4.197</h2database.version>
         <fuel.version>1.15.0</fuel.version>
 		<kovenant.version>3.3.0</kovenant.version>
 		<injekt-core.version>1.16.1</injekt-core.version>

couchbase/pom.xml

@@ -69,7 +69,6 @@
     <properties>
         <couchbase.client.version>2.5.0</couchbase.client.version>
         <spring-framework.version>4.3.5.RELEASE</spring-framework.version>
-        <commons-lang3.version>3.5</commons-lang3.version>
     </properties>
 
 </project>

custom-pmd/src/main/java/org/baeldung/pmd/UnitTestNamingConventionRule.java

@@ -22,6 +22,10 @@ public class UnitTestNamingConventionRule extends AbstractJavaRule {
         String className = node.getImage();
         Objects.requireNonNull(className);
 
+        if (className.endsWith("SpringContextTest")) {
+            return data;
+        }
+        
         if (className.endsWith("Tests")
                 || (className.endsWith("Test") && allowedEndings.stream().noneMatch(className::endsWith))) {
             addViolation(data, node);

disruptor/pom.xml

@@ -115,7 +115,6 @@
 
     <properties>
         <!-- util -->
-        <commons-lang3.version>3.5</commons-lang3.version>
         <disruptor.version>3.3.6</disruptor.version>
         <!-- testing -->
         <testng.version>6.10</testng.version>

dozer/pom.xml

@@ -26,7 +26,6 @@
     </dependencies>
 
     <properties>
-        <commons-lang3.version>3.5</commons-lang3.version>
         <dozer.version>5.5.1</dozer.version>
     </properties>
 

flyway-cdi-extension/pom.xml

@@ -58,6 +58,5 @@
 		<flyway-core.version>5.1.4</flyway-core.version>
 		<tomcat-jdbc.version>8.5.33</tomcat-jdbc.version>
 		<javax.annotation-api.version>1.3.2</javax.annotation-api.version>
-		<h2.version>1.4.197</h2.version>
     </properties>
 </project>

gson/pom.xml

@@ -64,7 +64,6 @@
         <!-- marshalling -->
         <gson.version>2.8.0</gson.version>
         <!-- util -->
-        <commons-lang3.version>3.5</commons-lang3.version>
         <commons-collections4.version>4.1</commons-collections4.version>
         <joda-time.version>2.9.6</joda-time.version>
     </properties>

guava-collections/pom.xml

@@ -55,7 +55,6 @@
     <properties>
         <!-- util -->
         <guava.version>24.0-jre</guava.version>
-        <commons-lang3.version>3.5</commons-lang3.version>
         <commons-collections4.version>4.1</commons-collections4.version>
 
         <!-- testing -->

guava/pom.xml

@@ -49,7 +49,6 @@
     <properties>
         <!-- util -->
         <guava.version>24.0-jre</guava.version>
-        <commons-lang3.version>3.5</commons-lang3.version>
 
         <!-- testing -->
         <assertj.version>3.6.1</assertj.version>

httpclient-simple/pom.xml

@@ -297,7 +297,6 @@
     <properties>
         <!-- util -->
         <guava.version>19.0</guava.version>
-        <commons-lang3.version>3.5</commons-lang3.version>
         <commons-codec.version>1.10</commons-codec.version>
         <httpasyncclient.version>4.1.4</httpasyncclient.version>
         <!-- testing -->
@@ -305,7 +304,6 @@
         <httpcore.version>4.4.11</httpcore.version>
         <httpclient.version>4.5.8</httpclient.version> <!-- 4.3.6 --> <!-- 4.4-beta1 -->
         <!-- maven plugins -->
-        <maven-war-plugin.version>2.6</maven-war-plugin.version>
         <cargo-maven2-plugin.version>1.6.1</cargo-maven2-plugin.version>
     </properties>
 

httpclient/pom.xml

@@ -120,7 +120,6 @@
     <properties>
         <!-- util -->
         <guava.version>19.0</guava.version>
-        <commons-lang3.version>3.5</commons-lang3.version>
         <commons-codec.version>1.10</commons-codec.version>
         <httpasyncclient.version>4.1.4</httpasyncclient.version>
         <!-- testing -->

hystrix/pom.xml

@@ -65,7 +65,6 @@
         <hystrix-core.version>1.5.8</hystrix-core.version>
         <rxjava-core.version>0.20.7</rxjava-core.version>
         <!-- maven plugins -->
-        <maven-war-plugin.version>2.6</maven-war-plugin.version>
         <maven-resources-plugin.version>2.7</maven-resources-plugin.version>
         <hystrix-metrics-event-stream.version>1.5.8</hystrix-metrics-event-stream.version>
         <hystrix-dashboard.version>1.5.8</hystrix-dashboard.version>

jackson-simple/pom.xml

@@ -118,7 +118,6 @@
 
     <properties>
         <!-- util -->
-        <commons-lang3.version>3.8</commons-lang3.version>
         <joda-time.version>2.10</joda-time.version>
         <gson.version>2.8.5</gson.version>
         <commons-collections4.version>4.2</commons-collections4.version>

jackson-simple/src/test/java/com/baeldung/jackson/test/JacksonSerializationIgnoreUnitTest.java

@@ -165,7 +165,7 @@ public class JacksonSerializationIgnoreUnitTest {
     }
 
     @Test
-    public final void givenIgnoringNullFieldsOnClass_whenWritingObjectWithNullField_thenFieldIsIgnored() throws JsonProcessingException {
+    public final void givenNullsIgnoredOnClass_whenWritingObjectWithNullField_thenIgnored() throws JsonProcessingException {
         final ObjectMapper mapper = new ObjectMapper();
         final MyDtoIgnoreNull dtoObject = new MyDtoIgnoreNull();
 
@@ -178,7 +178,7 @@ public class JacksonSerializationIgnoreUnitTest {
     }
 
     @Test
-    public final void givenIgnoringNullFieldsGlobally_whenWritingObjectWithNullField_thenIgnored() throws JsonProcessingException {
+    public final void givenNullsIgnoredGlobally_whenWritingObjectWithNullField_thenIgnored() throws JsonProcessingException {
         final ObjectMapper mapper = new ObjectMapper();
         mapper.setSerializationInclusion(Include.NON_NULL);
         final MyDto dtoObject = new MyDto();

jackson/pom.xml

@@ -118,7 +118,6 @@
 
     <properties>
         <!-- util -->
-        <commons-lang3.version>3.8</commons-lang3.version>
         <joda-time.version>2.10</joda-time.version>
         <gson.version>2.8.5</gson.version>
         <commons-collections4.version>4.2</commons-collections4.version>

java-collections-conversions/pom.xml

@@ -33,7 +33,6 @@
     </dependencies>
 
     <properties>
-        <commons-lang3.version>3.5</commons-lang3.version>
         <commons-collections4.version>4.1</commons-collections4.version>
         <assertj.version>3.6.1</assertj.version>
     </properties>

java-collections-maps-2/pom.xml

@@ -54,7 +54,6 @@
         <trove4j.version>3.0.2</trove4j.version>
         <fastutil.version>8.1.0</fastutil.version>
         <colt.version>1.2.0</colt.version>
-        <commons-lang3.version>3.8.1</commons-lang3.version>
         <assertj.version>3.11.1</assertj.version>
     </properties>
 

java-collections-maps/pom.xml

@@ -44,7 +44,6 @@
     </dependencies>
 
     <properties>
-        <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>

java-dates/pom.xml

@@ -74,8 +74,6 @@
     </build>
 
     <properties>
-        <!-- util -->
-        <commons-lang3.version>3.5</commons-lang3.version>
         <joda-time.version>2.10</joda-time.version>
         <!-- testing -->
         <assertj.version>3.6.1</assertj.version>

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

@@ -72,8 +72,6 @@
         <javaee-version>8.0</javaee-version>
         <liberty-maven-plugin.version>2.3</liberty-maven-plugin.version>
         <openliberty-runtime.version>18.0.0.1</openliberty-runtime.version>
-        
-        <maven-war-plugin.version>3.2.2</maven-war-plugin.version>
     </properties>
 
 </project>

java-numbers-2/.gitignore

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

java-numbers-2/pom.xml

@@ -0,0 +1,135 @@
+<project xmlns="http://maven.apache.org/POM/4.0.0"
+    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+    xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
+    <modelVersion>4.0.0</modelVersion>
+    <artifactId>java-numbers-2</artifactId>
+    <version>0.1.0-SNAPSHOT</version>
+    <name>java-numbers-2</name>
+    <packaging>jar</packaging>
+
+    <parent>
+        <groupId>com.baeldung</groupId>
+        <artifactId>parent-java</artifactId>
+        <version>0.0.1-SNAPSHOT</version>
+        <relativePath>../parent-java</relativePath>
+    </parent>
+
+    <dependencies>
+        <dependency>
+            <groupId>log4j</groupId>
+            <artifactId>log4j</artifactId>
+            <version>${log4j.version}</version>
+        </dependency>
+        <dependency>
+            <groupId>org.slf4j</groupId>
+            <artifactId>slf4j-api</artifactId>
+            <version>${org.slf4j.version}</version>
+        </dependency>
+        <dependency>
+            <groupId>ch.qos.logback</groupId>
+            <artifactId>logback-classic</artifactId>
+            <version>${logback.version}</version>
+        </dependency>
+        <dependency>
+            <groupId>org.openjdk.jmh</groupId>
+            <artifactId>jmh-core</artifactId>
+            <version>${jmh-core.version}</version>
+        </dependency>
+        <dependency>
+            <groupId>org.openjdk.jmh</groupId>
+            <artifactId>jmh-generator-annprocess</artifactId>
+            <version>${jmh-generator.version}</version>
+        </dependency>
+        <dependency>
+            <groupId>org.apache.commons</groupId>
+            <artifactId>commons-math3</artifactId>
+            <version>${commons-math3.version}</version>
+        </dependency>
+        <dependency>
+            <groupId>org.apache.commons</groupId>
+            <artifactId>commons-lang3</artifactId>
+            <version>${commons-lang3.version}</version>
+        </dependency>
+        <dependency>
+            <groupId>org.decimal4j</groupId>
+            <artifactId>decimal4j</artifactId>
+            <version>${decimal4j.version}</version>
+        </dependency>
+        <dependency>
+            <groupId>org.assertj</groupId>
+            <artifactId>assertj-core</artifactId>
+            <version>${assertj.version}</version>
+            <scope>test</scope>
+        </dependency>
+    </dependencies>
+
+    <build>
+        <finalName>java-numbers-2</finalName>
+        <resources>
+            <resource>
+                <directory>src/main/resources</directory>
+                <filtering>true</filtering>
+            </resource>
+        </resources>
+
+        <plugins>
+
+            <plugin>
+                <groupId>org.apache.maven.plugins</groupId>
+                <artifactId>maven-javadoc-plugin</artifactId>
+                <version>${maven-javadoc-plugin.version}</version>
+                <configuration>
+                    <source>1.8</source>
+                    <target>1.8</target>
+                </configuration>
+            </plugin>
+        </plugins>
+    </build>
+
+    <profiles>
+        <profile>
+            <id>integration</id>
+            <build>
+                <plugins>
+                    <plugin>
+                        <groupId>org.apache.maven.plugins</groupId>
+                        <artifactId>maven-surefire-plugin</artifactId>
+                        <executions>
+                            <execution>
+                                <phase>integration-test</phase>
+                                <goals>
+                                    <goal>test</goal>
+                                </goals>
+                                <configuration>
+                                    <includes>
+                                        <include>**/*IntegrationTest.java</include>
+                                    </includes>
+                                </configuration>
+                            </execution>
+                        </executions>
+                        <configuration>
+                            <systemPropertyVariables>
+                                <test.mime>json</test.mime>
+                            </systemPropertyVariables>
+                        </configuration>
+                    </plugin>
+                </plugins>
+            </build>
+        </profile>
+    </profiles>
+
+    <properties>
+        <commons-math3.version>3.6.1</commons-math3.version>
+        <decimal4j.version>1.0.3</decimal4j.version>
+        <commons-lang3.version>3.5</commons-lang3.version>
+
+        <assertj.version>3.6.1</assertj.version>
+
+        <org.slf4j.version>1.7.21</org.slf4j.version>
+        <logback.version>1.1.7</logback.version>
+
+        <maven-surefire-plugin.version>2.21.0</maven-surefire-plugin.version>
+        <maven-javadoc-plugin.version>3.0.0-M1</maven-javadoc-plugin.version>
+        <maven-jar-plugin.version>3.0.2</maven-jar-plugin.version>
+    </properties>
+</project>

java-numbers-2/src/test/java/com/baeldung/lossyconversion/ConversionTechniquesUnitTest.java

@@ -0,0 +1,68 @@
+package com.baeldung.lossyconversion;
+
+import static org.junit.Assert.assertEquals;
+import static org.junit.Assert.assertTrue;
+
+import org.junit.jupiter.api.Test;
+
+public class ConversionTechniquesUnitTest {
+
+    @Test
+    public void testPrimitiveConversion() {
+        
+        long longNum = 24;
+        short shortNum = (short) longNum;
+        assertEquals(24, shortNum);
+
+        double doubleNum = 15.6;
+        int integerNum = (int) doubleNum;
+        assertEquals(15, integerNum);
+        
+        long largeLongNum = 32768;
+        short minShortNum = (short) largeLongNum;
+        assertEquals(-32768, minShortNum);
+        
+        long smallLongNum = -32769;
+        short maxShortNum = (short) smallLongNum;
+        assertEquals(32767, maxShortNum);
+        
+        long maxLong = Long.MAX_VALUE;
+        int minInt = (int) maxLong;
+        assertEquals(-1, minInt);
+        
+        long minLong = Long.MIN_VALUE;
+        int maxInt = (int) minLong;
+        assertEquals(0, maxInt);
+    }
+
+    @Test
+    public void testWrapperToPrimitiveConversion() {
+
+        Float floatNum = 17.564f;
+        long longNum = floatNum.longValue();
+        assertEquals(17, longNum);
+
+        Double doubleNum = 15.9999;
+        longNum = doubleNum.longValue();
+        assertEquals(15, longNum);
+    }
+
+    @Test
+    public void testWrapperToPrimitiveConversionUsingMathRound() {
+
+        Double doubleNum = 15.9999;
+        long longNum = Math.round(doubleNum);
+        assertEquals(16, longNum);
+    }
+    
+    @Test
+    public void testWrapperConversion() {
+
+        Double doubleNum = 10.3;
+        double dbl = doubleNum.doubleValue(); //unboxing
+        int intgr = (int) dbl; //downcasting
+        Integer intNum = Integer.valueOf(intgr);
+        assertEquals(Integer.valueOf(10), intNum);
+    }
+    
+}

java-numbers/pom.xml

@@ -121,7 +121,6 @@
     <properties>
         <commons-math3.version>3.6.1</commons-math3.version>
         <decimal4j.version>1.0.3</decimal4j.version>
-        <commons-lang3.version>3.5</commons-lang3.version>
 
         <assertj.version>3.6.1</assertj.version>
 

java-streams/pom.xml

@@ -106,7 +106,6 @@
 
     <properties>
         <!-- util -->
-        <commons-lang3.version>3.5</commons-lang3.version>
         <vavr.version>0.9.0</vavr.version>
         <protonpack.version>1.15</protonpack.version>
         <streamex.version>0.6.5</streamex.version>

java-strings-2/README.MD

@@ -4,3 +4,4 @@
 - [Check If a String Contains a Substring](https://www.baeldung.com/java-string-contains-substring)
 - [Removing Stopwords from a String in Java](https://www.baeldung.com/java-string-remove-stopwords)
 - [Blank and Empty Strings in Java](https://www.baeldung.com/java-blank-empty-strings)
+- [String Initialization in Java](https://www.baeldung.com/java-string-initialization)

java-strings-2/src/test/java/com/baeldung/string/multiline/MultiLineStringUnitTest.java

@@ -1,4 +1,4 @@
-package com.baeldung.string;
+package com.baeldung.string.multiline;
 
 import org.junit.Test;
 import static org.junit.Assert.assertEquals;

javax-servlets/pom.xml

@@ -88,7 +88,6 @@
         <assertj.version>3.9.1</assertj.version>
         <mockito.version>2.21.0</mockito.version>
         <commons-fileupload.version>1.3.3</commons-fileupload.version>
-        <commons-io.version>2.6</commons-io.version>
         <javax.servlet-api.version>4.0.1</javax.servlet-api.version>
     </properties>
 </project>

jaxb/pom.xml

@@ -130,8 +130,6 @@
         <!-- maven plugins -->
         <jaxb2-maven-plugin.version>2.3</jaxb2-maven-plugin.version>
         <istack-commons-runtime.version>3.0.2</istack-commons-runtime.version>
-        <commons-io.version>2.5</commons-io.version>
-        <commons-lang3.version>3.5</commons-lang3.version>
         <lifecycle-mapping-plugin.version>1.0.0</lifecycle-mapping-plugin.version>
 
         <javax.activation.version>1.1</javax.activation.version>

jee-7/pom.xml

@@ -519,11 +519,9 @@
 		<tyrus.version>1.13</tyrus.version>
 		<jersey.version>2.25</jersey.version>
 		<arquillian-glassfish.version>1.0.0.Final</arquillian-glassfish.version>
-		<maven-war-plugin.version>2.6</maven-war-plugin.version>
 		<org.springframework.security.version>4.2.3.RELEASE</org.springframework.security.version>
 		<maven-surefire-plugin.version>2.21.0</maven-surefire-plugin.version>
 		<taglibs.standard.version>1.1.2</taglibs.standard.version>
-		<commons-io.version>2.4</commons-io.version>
 		<com.sun.faces.jsf.version>2.2.14</com.sun.faces.jsf.version>
 		<httpclient.version>4.5</httpclient.version>
 		<arquillian-drone-bom.version>2.0.1.Final</arquillian-drone-bom.version>

jee-kotlin/pom.xml

@@ -2,43 +2,16 @@
 <project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/maven-v4_0_0.xsd">
 
     <modelVersion>4.0.0</modelVersion>
+    <artifactId>jee-kotlin</artifactId>
+    <name>jee-kotlin</name>
+    <packaging>war</packaging>
+	
     <parent>
         <artifactId>parent-modules</artifactId>
         <groupId>com.baeldung</groupId>
         <version>1.0.0-SNAPSHOT</version>
     </parent>
 
-    <artifactId>jee-kotlin</artifactId>
-    <name>jee-kotlin</name>
-    <packaging>war</packaging>
-
-    <properties>
-        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
-        <failOnMissingWebXml>false</failOnMissingWebXml>
-        <javaee-api.version>8.0</javaee-api.version>
-
-
-        <kotlin.version>1.3.41</kotlin.version>
-        <kotlin.code.style>official</kotlin.code.style>
-        <kotlin.compiler.incremental>true</kotlin.compiler.incremental>
-
-
-        <wildfly.version>8.2.1.Final</wildfly.version>
-        <mvn-war-plugin.version>3.2.3</mvn-war-plugin.version>
-        <maven-surefire-plugin.version>2.21.0</maven-surefire-plugin.version>
-        <maven-dependency-plugin.version>3.1.1</maven-dependency-plugin.version>
-
-        <arquillian_core.version>1.4.1.Final</arquillian_core.version>
-        <arquillian-drone-bom.version>2.0.1.Final</arquillian-drone-bom.version>
-        <arquillian-rest-client.version>1.0.0.Alpha4</arquillian-rest-client.version>
-
-        <junit.version>4.12</junit.version>
-        <resteasy.version>3.8.0.Final</resteasy.version>
-        <jackson.version>2.9.8</jackson.version>
-        <shrinkwrap.version>3.1.3</shrinkwrap.version>
-
-    </properties>
-
     <dependencies>
         <dependency>
             <groupId>org.jetbrains.kotlin</groupId>
@@ -134,7 +107,7 @@
             <plugin>
                 <groupId>org.apache.maven.plugins</groupId>
                 <artifactId>maven-war-plugin</artifactId>
-                <version>${mvn-war-plugin.version}</version>
+                <version>${maven-war-plugin.version}</version>
                 <configuration>
                     <warSourceDirectory>webapp</warSourceDirectory>
                     <warName>kotlin</warName>
@@ -286,4 +259,28 @@
             </dependencies>
         </profile>
     </profiles>
+
+    <properties>
+        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
+        <failOnMissingWebXml>false</failOnMissingWebXml>
+        <javaee-api.version>8.0</javaee-api.version>
+
+
+        <kotlin.version>1.3.41</kotlin.version>
+        <kotlin.code.style>official</kotlin.code.style>
+        <kotlin.compiler.incremental>true</kotlin.compiler.incremental>
+
+
+        <wildfly.version>8.2.1.Final</wildfly.version>
+        <maven-surefire-plugin.version>2.21.0</maven-surefire-plugin.version>
+        <maven-dependency-plugin.version>3.1.1</maven-dependency-plugin.version>
+
+        <arquillian_core.version>1.4.1.Final</arquillian_core.version>
+        <arquillian-drone-bom.version>2.0.1.Final</arquillian-drone-bom.version>
+        <arquillian-rest-client.version>1.0.0.Alpha4</arquillian-rest-client.version>
+
+        <resteasy.version>3.8.0.Final</resteasy.version>
+        <shrinkwrap.version>3.1.3</shrinkwrap.version>
+
+    </properties>
 </project>

jersey/pom.xml

@@ -80,7 +80,6 @@
 
     <properties>
         <jersey.version>2.26</jersey.version>
-        <maven-war-plugin.version>3.2.0</maven-war-plugin.version>
     </properties>
 
 </project>

jhipster/README.md

@@ -1,6 +0,0 @@
-## Relevant articles:
-
-- [JHipster with a Microservice Architecture](http://www.baeldung.com/jhipster-microservices)
-- [Intro to JHipster](http://www.baeldung.com/jhipster)
-- [Building a Basic UAA-Secured JHipster Microservice](https://www.baeldung.com/jhipster-uaa-secured-micro-service)
-- [Creating New Roles and Authorities in JHipster](https://www.baeldung.com/jhipster-new-roles)

jsf/pom.xml

@@ -99,9 +99,6 @@
         <com.sun.faces.version>2.2.14</com.sun.faces.version>
         <javax.el.version>3.0.0</javax.el.version>
 
-        <!-- maven plugins -->
-        <maven-war-plugin.version>2.6</maven-war-plugin.version>
-
         <primefaces.version>6.2</primefaces.version>
     </properties>
 

jws/pom.xml

@@ -83,7 +83,6 @@
 
     <properties>
         <maven-jar-plugin.version>3.0.2</maven-jar-plugin.version>
-        <maven-war-plugin.version>3.0.0</maven-war-plugin.version>
         <jnlp-jardiff.version>1.6.0</jnlp-jardiff.version>
         <jnlp-servlet.version>1.6.0</jnlp-servlet.version>
     </properties>

kotlin-libraries/pom.xml

@@ -94,7 +94,7 @@
         <dependency>
             <groupId>com.h2database</groupId>
             <artifactId>h2</artifactId>
-            <version>${h2database.version}</version>
+            <version>${h2.version}</version>
         </dependency>
         <!-- https://mvnrepository.com/artifact/io.arrow-kt/arrow-core -->
         <dependency>
@@ -184,7 +184,6 @@
         <junit.platform.version>1.1.1</junit.platform.version>
         <junit.vintage.version>5.2.0</junit.vintage.version>
         <assertj.version>3.10.0</assertj.version>
-        <h2database.version>1.4.197</h2database.version>
         <exposed.version>0.10.4</exposed.version>
         <mockk.version>1.9.3</mockk.version>
     </properties>

libraries-apache-commons/pom.xml

@@ -25,7 +25,7 @@
         <dependency>
             <groupId>org.apache.commons</groupId>
             <artifactId>commons-lang3</artifactId>
-            <version>${commons-lang.version}</version>
+            <version>${commons-lang3.version}</version>
         </dependency>
         <dependency>
             <groupId>org.apache.commons</groupId>
@@ -35,7 +35,7 @@
         <dependency>
             <groupId>commons-io</groupId>
             <artifactId>commons-io</artifactId>
-            <version>${commons.io.version}</version>
+            <version>${commons-io.version}</version>
         </dependency>
         <dependency>
             <groupId>commons-chain</groupId>
@@ -87,13 +87,12 @@
     </dependencies>
 
     <properties>
-        <commons-lang.version>3.6</commons-lang.version>
+        <commons-lang3.version>3.6</commons-lang3.version>
         <commons-text.version>1.1</commons-text.version>
         <commons-beanutils.version>1.9.3</commons-beanutils.version>
         <commons-chain.version>1.2</commons-chain.version>
         <commons-csv.version>1.4</commons-csv.version>
         <assertj.version>3.6.2</assertj.version>
-        <commons.io.version>2.5</commons.io.version>
         <commons.dbutils.version>1.6</commons.dbutils.version>
         <commons.collections.version>4.1</commons.collections.version>
         <org.hamcrest.java-hamcrest.version>2.0.0.0</org.hamcrest.java-hamcrest.version>

libraries-data/pom.xml

@@ -449,7 +449,6 @@
         <gson.version>2.8.2</gson.version>
         <cache.version>1.1.0</cache.version>
         <flink.version>1.5.0</flink.version>
-        <jackson.version>2.9.7</jackson.version>
         <awaitility.version>3.0.0</awaitility.version>
         <assertj.version>3.6.2</assertj.version>
         <hazelcast.version>3.8.4</hazelcast.version>

libraries-io/README.md

@@ -0,0 +1,5 @@
+
+### Relevant Articles: 
+
+- [Transferring a File Through SFTP in Java](https://www.baeldung.com/java-file-sftp)
+

libraries-io/pom.xml

@@ -0,0 +1,40 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project xmlns="http://maven.apache.org/POM/4.0.0"
+    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+    xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
+    <modelVersion>4.0.0</modelVersion>
+    <artifactId>libraries-io</artifactId>
+    <name>libraries-io</name>
+
+    <parent>
+        <groupId>com.baeldung</groupId>
+        <artifactId>parent-modules</artifactId>
+        <version>1.0.0-SNAPSHOT</version>
+    </parent>
+
+    <dependencies>
+        <!-- sftp file transfer -->
+        <dependency>
+            <groupId>com.jcraft</groupId>
+            <artifactId>jsch</artifactId>
+            <version>${jsch.version}</version>
+        </dependency>
+        <dependency>
+            <groupId>com.hierynomus</groupId>
+            <artifactId>sshj</artifactId>
+            <version>${sshj.version}</version>
+        </dependency>
+        <dependency>
+            <groupId>org.apache.commons</groupId>
+            <artifactId>commons-vfs2</artifactId>
+            <version>${vfs.version}</version>
+        </dependency>
+    </dependencies>
+
+    <properties>
+        <!-- sftp -->
+        <jsch.version>0.1.55</jsch.version>
+        <sshj.version>0.27.0</sshj.version>
+        <vfs.version>2.4</vfs.version>
+    </properties>
+</project>

libraries-io/src/main/resources/input.txt

@@ -0,0 +1 @@
+This is a sample text content

libraries-io/src/test/java/org/baeldung/java/io/remote/SftpFileTransferLiveTest.java

@@ -0,0 +1,106 @@
+package org.baeldung.java.io.remote;
+
+import java.io.IOException;
+
+import org.apache.commons.vfs2.FileObject;
+import org.apache.commons.vfs2.FileSystemManager;
+import org.apache.commons.vfs2.Selectors;
+import org.apache.commons.vfs2.VFS;
+import org.junit.Test;
+
+import com.jcraft.jsch.ChannelSftp;
+import com.jcraft.jsch.JSch;
+import com.jcraft.jsch.JSchException;
+import com.jcraft.jsch.Session;
+import com.jcraft.jsch.SftpException;
+
+import net.schmizz.sshj.SSHClient;
+import net.schmizz.sshj.sftp.SFTPClient;
+import net.schmizz.sshj.transport.verification.PromiscuousVerifier;
+
+public class SftpFileTransferLiveTest {
+
+    private String remoteHost = "HOST_NAME_HERE";
+    private String username = "USERNAME_HERE";
+    private String password = "PASSWORD_HERE";
+    private String localFile = "src/main/resources/input.txt";
+    private String remoteFile = "welcome.txt";
+    private String localDir = "src/main/resources/";
+    private String remoteDir = "remote_sftp_test/";
+    private String knownHostsFileLoc = "/Users/USERNAME/known_hosts_sample";
+
+    @Test
+    public void whenUploadFileUsingJsch_thenSuccess() throws JSchException, SftpException {
+        ChannelSftp channelSftp = setupJsch();
+        channelSftp.connect();
+        channelSftp.put(localFile, remoteDir + "jschFile.txt");
+        channelSftp.exit();
+    }
+
+    @Test
+    public void whenDownloadFileUsingJsch_thenSuccess() throws JSchException, SftpException {
+        ChannelSftp channelSftp = setupJsch();
+        channelSftp.connect();
+        channelSftp.get(remoteFile, localDir + "jschFile.txt");
+        channelSftp.exit();
+    }
+
+    @Test
+    public void whenUploadFileUsingSshj_thenSuccess() throws IOException {
+        SSHClient sshClient = setupSshj();
+        SFTPClient sftpClient = sshClient.newSFTPClient();
+        sftpClient.put(localFile, remoteDir + "sshjFile.txt");
+        sftpClient.close();
+        sshClient.disconnect();
+    }
+
+    @Test
+    public void whenDownloadFileUsingSshj_thenSuccess() throws IOException {
+        SSHClient sshClient = setupSshj();
+        SFTPClient sftpClient = sshClient.newSFTPClient();
+        sftpClient.get(remoteFile, localDir + "sshjFile.txt");
+        sftpClient.close();
+        sshClient.disconnect();
+    }
+
+    @Test
+    public void whenUploadFileUsingApacheVfs_thenSuccess() throws IOException {
+        FileSystemManager manager = VFS.getManager();
+        FileObject local = manager.resolveFile(System.getProperty("user.dir") + "/" + localFile);
+        FileObject remote = manager.resolveFile("sftp://" + username + ":" + password + "@" + remoteHost + "/" + remoteDir + "vfsFile.txt");
+        remote.copyFrom(local, Selectors.SELECT_SELF);
+        local.close();
+        remote.close();
+    }
+
+    @Test
+    public void whenDownloadFileUsingApacheVfs_thenSuccess() throws IOException {
+        FileSystemManager manager = VFS.getManager();
+        FileObject local = manager.resolveFile(System.getProperty("user.dir") + "/" + localDir + "vfsFile.txt");
+        FileObject remote = manager.resolveFile("sftp://" + username + ":" + password + "@" + remoteHost + "/" + remoteFile);
+        local.copyFrom(remote, Selectors.SELECT_SELF);
+        local.close();
+        remote.close();
+    }
+
+    // ====== ssh-keyscan -H -t rsa remoteHost >> known_hosts_sample
+
+    private ChannelSftp setupJsch() throws JSchException {
+        JSch jsch = new JSch();
+        jsch.setKnownHosts(knownHostsFileLoc);
+        Session jschSession = jsch.getSession(username, remoteHost);
+        jschSession.setPassword(password);
+        //jschSession.setConfig("StrictHostKeyChecking", "no");
+        jschSession.connect();
+        return (ChannelSftp) jschSession.openChannel("sftp");
+    }
+
+    private SSHClient setupSshj() throws IOException {
+        SSHClient client = new SSHClient();
+        client.addHostKeyVerifier(new PromiscuousVerifier());
+        client.connect(remoteHost);
+        client.authPassword(username, password);
+        return client;
+    }
+
+}