Merge branch 'master' of https://github.com/eugenp/tutorials into BAEL-10897

algorithms-miscellaneous-2/src/main/java/com/baeldung/algorithms/relativelyprime/RelativelyPrime.java

@@ -0,0 +1,45 @@
+package com.baeldung.algorithms.relativelyprime;
+
+import java.math.BigInteger;
+
+class RelativelyPrime {
+
+    static boolean iterativeRelativelyPrime(int a, int b) {
+        return iterativeGCD(a, b) == 1;
+    }
+
+    static boolean recursiveRelativelyPrime(int a, int b) {
+        return recursiveGCD(a, b) == 1;
+    }
+
+    static boolean bigIntegerRelativelyPrime(int a, int b) {
+        return BigInteger.valueOf(a).gcd(BigInteger.valueOf(b)).equals(BigInteger.ONE);
+    }
+
+    private static int iterativeGCD(int a, int b) {
+        int tmp;
+        while (b != 0) {
+            if (a < b) {
+                tmp = a;
+                a = b;
+                b = tmp;
+            }
+            tmp = b;
+            b = a % b;
+            a = tmp;
+        }
+        return a;
+    }
+
+    private static int recursiveGCD(int a, int b) {
+        if (b == 0) {
+            return a;
+        }
+        if (a < b) {
+            return recursiveGCD(b, a);
+        }
+        return recursiveGCD(b, a % b);
+    }
+
+
+}

algorithms-miscellaneous-2/src/test/java/com/baeldung/algorithms/relativelyprime/RelativelyPrimeUnitTest.java

@@ -0,0 +1,51 @@
+package com.baeldung.algorithms.relativelyprime;
+
+import org.junit.Test;
+
+import static com.baeldung.algorithms.relativelyprime.RelativelyPrime.*;
+import static org.assertj.core.api.Assertions.assertThat;
+
+public class RelativelyPrimeUnitTest {
+
+    @Test
+    public void givenNonRelativelyPrimeNumbers_whenCheckingIteratively_shouldReturnFalse() {
+
+        boolean result = iterativeRelativelyPrime(45, 35);
+        assertThat(result).isFalse();
+    }
+
+    @Test
+    public void givenRelativelyPrimeNumbers_whenCheckingIteratively_shouldReturnTrue() {
+
+        boolean result = iterativeRelativelyPrime(500, 501);
+        assertThat(result).isTrue();
+    }
+
+    @Test
+    public void givenNonRelativelyPrimeNumbers_whenCheckingRecursively_shouldReturnFalse() {
+
+        boolean result = recursiveRelativelyPrime(45, 35);
+        assertThat(result).isFalse();
+    }
+
+    @Test
+    public void givenRelativelyPrimeNumbers_whenCheckingRecursively_shouldReturnTrue() {
+
+        boolean result = recursiveRelativelyPrime(500, 501);
+        assertThat(result).isTrue();
+    }
+
+    @Test
+    public void givenNonRelativelyPrimeNumbers_whenCheckingUsingBigIntegers_shouldReturnFalse() {
+
+        boolean result = bigIntegerRelativelyPrime(45, 35);
+        assertThat(result).isFalse();
+    }
+
+    @Test
+    public void givenRelativelyPrimeNumbers_whenCheckingBigIntegers_shouldReturnTrue() {
+
+        boolean result = bigIntegerRelativelyPrime(500, 501);
+        assertThat(result).isTrue();
+    }
+}

core-groovy/README.md

@@ -9,3 +9,5 @@
 - [A Quick Guide to Iterating a Map in Groovy](https://www.baeldung.com/groovy-map-iterating)
 - [An Introduction to Traits in Groovy](https://www.baeldung.com/groovy-traits)
 - [Lists in Groovy](https://www.baeldung.com/groovy-lists)
+- [Converting a String to a Date in Groovy](https://www.baeldung.com/groovy-string-to-date)
+- [Guide to I/O in Groovy](https://www.baeldung.com/groovy-io)

core-java-11/README.md

@@ -5,3 +5,4 @@
 - [Java 11 String API Additions](https://www.baeldung.com/java-11-string-api)
 - [Java 11 Nest Based Access Control](https://www.baeldung.com/java-nest-based-access-control)
 - [Exploring the New HTTP Client in Java 9 and 11](https://www.baeldung.com/java-9-http-client)
+- [An Introduction to Epsilon GC: A No-Op Experimental Garbage Collector](https://www.baeldung.com/jvm-epsilon-gc-garbage-collector)

core-java-9/README.md

@@ -27,3 +27,6 @@
 - [Immutable Set in Java](https://www.baeldung.com/java-immutable-set)
 - [Multi-Release Jar Files](https://www.baeldung.com/java-multi-release-jar)
 - [Ahead of Time Compilation (AoT)](https://www.baeldung.com/ahead-of-time-compilation)
+- [Java 9 Process API Improvements](https://www.baeldung.com/java-9-process-api)
+- [Guide to java.lang.Process API](https://www.baeldung.com/java-process-api)
+

core-java-collections/README.md

@@ -33,3 +33,4 @@
 - [Differences Between HashMap and Hashtable](https://www.baeldung.com/hashmap-hashtable-differences)
 - [Java ArrayList vs Vector](https://www.baeldung.com/java-arraylist-vs-vector)
 - [Defining a Char Stack in Java](https://www.baeldung.com/java-char-stack)
+- [Time Comparison of Arrays.sort(Object[]) and Arrays.sort(int[])](https://www.baeldung.com/arrays-sortobject-vs-sortint)

core-java-concurrency-basic/README.md

@@ -16,3 +16,4 @@
 - [Life Cycle of a Thread in Java](http://www.baeldung.com/java-thread-lifecycle)
 - [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)

core-java-os/README.md

@@ -6,3 +6,5 @@ This module uses Java 9, so make sure to have the JDK 9 installed to run it.
 ### Relevant Articles: 
 - [Java 9 Process API Improvements](http://www.baeldung.com/java-9-process-api)
 - [Guide to java.lang.Process API](https://www.baeldung.com/java-process-api)
+- [Guide to java.lang.ProcessBuilder API](https://www.baeldung.com/java-lang-processbuilder-api)
+

core-java/README.md

@@ -50,3 +50,4 @@
 - [Finding Leap Years in Java](https://www.baeldung.com/java-leap-year)
 - [Java Bitwise Operators](https://www.baeldung.com/java-bitwise-operators)
 - [Guide to Creating and Running a Jar File in Java](https://www.baeldung.com/java-create-jar)
+- [Making a JSON POST Request With HttpURLConnection](https://www.baeldung.com/httpurlconnection-post)

core-kotlin-2/README.md

@@ -3,4 +3,4 @@
 - [Void Type in Kotlin](https://www.baeldung.com/kotlin-void-type)
 - [How to use Kotlin Range Expressions](https://www.baeldung.com/kotlin-ranges)
 - [Split a List into Parts in Kotlin](https://www.baeldung.com/kotlin-split-list-into-parts)
-
+- [String Comparison in Kotlin](https://www.baeldung.com/kotlin-string-comparison)

core-kotlin-2/pom.xml

@@ -13,4 +13,66 @@
         <relativePath>../parent-kotlin</relativePath>
     </parent>
 
+    <dependencies>
+        <dependency>
+            <groupId>org.jetbrains.kotlin</groupId>
+            <artifactId>kotlin-stdlib-jdk8</artifactId>
+            <version>${kotlin.version}</version>
+        </dependency>
+        <dependency>
+            <groupId>org.junit.platform</groupId>
+            <artifactId>junit-platform-runner</artifactId>
+            <version>${junit.platform.version}</version>
+            <scope>test</scope>
+        </dependency>
+        <dependency>
+            <groupId>org.assertj</groupId>
+            <artifactId>assertj-core</artifactId>
+            <version>${assertj.version}</version>
+            <scope>test</scope>
+        </dependency>
+        <dependency>
+            <groupId>org.jetbrains.kotlin</groupId>
+            <artifactId>kotlin-test</artifactId>
+            <version>${kotlin.version}</version>
+            <scope>test</scope>
+        </dependency>
+    </dependencies>
+
+    <build>
+        <plugins>
+            <plugin>
+                <groupId>org.jetbrains.kotlin</groupId>
+                <artifactId>kotlin-maven-plugin</artifactId>
+                <version>${kotlin.version}</version>
+                <executions>
+                    <execution>
+                        <id>compile</id>
+                        <phase>compile</phase>
+                        <goals>
+                            <goal>compile</goal>
+                        </goals>
+                    </execution>
+                    <execution>
+                        <id>test-compile</id>
+                        <phase>test-compile</phase>
+                        <goals>
+                            <goal>test-compile</goal>
+                        </goals>
+                    </execution>
+                </executions>
+                <configuration>
+                    <jvmTarget>1.8</jvmTarget>
+                </configuration>
+            </plugin>
+        </plugins>
+    </build>
+
+    <properties>
+        <kotlin.version>1.2.71</kotlin.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>
+    </properties>
+
 </project>

core-kotlin-2/src/main/kotlin/com/baeldung/range/CharRange.kt

@@ -0,0 +1,13 @@
+package com.baeldung.range
+
+fun main(args: Array<String>) {
+
+    for (ch in 'a'..'f') {
+        print(ch)
+    }
+    println()
+
+    for (ch in 'f' downTo 'a') {
+        print(ch)
+    }
+}

core-kotlin-2/src/main/kotlin/com/baeldung/range/Color.kt

@@ -0,0 +1,21 @@
+package com.baeldung.range
+
+enum class Color(val rgb: Int) {
+    BLUE(0x0000FF),
+    GREEN(0x008000),
+    RED(0xFF0000),
+    MAGENTA(0xFF00FF),
+    YELLOW(0xFFFF00);
+}
+
+fun main(args: Array<String>) {
+
+    println(Color.values().toList());
+    val red = Color.RED
+    val yellow = Color.YELLOW
+    val range = red..yellow
+
+    println(range.contains(Color.MAGENTA))
+    println(range.contains(Color.BLUE))
+    println(range.contains(Color.GREEN))
+}

core-kotlin-2/src/main/kotlin/com/baeldung/range/Filter.kt

@@ -0,0 +1,18 @@
+package com.baeldung.range
+
+fun main(args: Array<String>) {
+    val r = 1..10
+
+    //Apply filter
+    val f = r.filter { it -> it % 2 == 0 }
+    println(f)
+
+    //Map
+    val m = r.map { it -> it * it }
+    println(m)
+
+    //Reduce
+    val rdc = r.reduce { a, b -> a + b }
+    println(rdc)
+
+}

core-kotlin-2/src/main/kotlin/com/baeldung/range/FirstLast.kt

@@ -0,0 +1,8 @@
+package com.baeldung.range
+
+fun main(args: Array<String>) {
+
+    println((1..9).first)
+    println((1..9 step 2).step)
+    println((3..9).reversed().last)
+}

core-kotlin-2/src/main/kotlin/com/baeldung/range/OtherRangeFunctions.kt

@@ -0,0 +1,14 @@
+package com.baeldung.range
+
+fun main(args: Array<String>) {
+
+    val r = 1..20
+    println(r.min())
+    println(r.max())
+    println(r.sum())
+    println(r.average())
+    println(r.count())
+
+    val repeated = listOf(1, 1, 2, 4, 4, 6, 10)
+    println(repeated.distinct())
+}

core-kotlin-2/src/main/kotlin/com/baeldung/range/Range.kt

@@ -0,0 +1,28 @@
+package com.baeldung.range
+
+fun main(args: Array<String>) {
+
+    for (i in 1..9) {
+        print(i)
+    }
+    println()
+
+    for (i in 9 downTo 1) {
+        print(i)
+    }
+    println()
+
+    for (i in 1.rangeTo(9)) {
+        print(i)
+    }
+    println()
+
+    for (i in 9.downTo(1)) {
+        print(i)
+    }
+    println()
+
+    for (i in 1 until 9) {
+        print(i)
+    }
+}

core-kotlin-2/src/main/kotlin/com/baeldung/range/ReverseRange.kt

@@ -0,0 +1,14 @@
+package com.baeldung.range
+
+fun main(args: Array<String>) {
+
+    (1..9).reversed().forEach {
+        print(it)
+    }
+
+    println()
+
+    (1..9).reversed().step(3).forEach {
+        print(it)
+    }
+}

core-kotlin-2/src/main/kotlin/com/baeldung/range/Step.kt

@@ -0,0 +1,15 @@
+package com.baeldung.range
+
+fun main(args: Array<String>) {
+
+    for(i in 1..9 step 2){
+        print(i)
+    }
+
+    println()
+
+    for (i in 9 downTo 1 step 2){
+        print(i)
+    }
+
+}

core-kotlin-2/src/main/kotlin/com/baeldung/range/UntilRange.kt

@@ -0,0 +1,8 @@
+package com.baeldung.range
+
+fun main(args: Array<String>) {
+
+    for (i in 1 until 9) {
+        print(i)
+    }
+}

core-kotlin-2/src/test/kotlin/com/baeldung/range/CharRangeTest.kt

@@ -0,0 +1,17 @@
+package com.baeldung.range
+
+import org.junit.Test
+import kotlin.test.assertEquals
+
+class CharRangeTest {
+
+    @Test
+    fun testCharRange() {
+        assertEquals(listOf('a', 'b', 'c'), ('a'..'c').toList())
+    }
+
+    @Test
+    fun testCharDownRange() {
+        assertEquals(listOf('c', 'b', 'a'), ('c'.downTo('a')).toList())
+    }
+}

core-kotlin-2/src/test/kotlin/com/baeldung/range/ColorTest.kt

@@ -0,0 +1,20 @@
+package com.baeldung.range
+
+import org.junit.Test
+import kotlin.test.assertFalse
+import kotlin.test.assertTrue
+
+class ColorTest {
+
+    @Test
+    fun testEnumRange() {
+
+        println(Color.values().toList());
+        val red = Color.RED
+        val yellow = Color.YELLOW
+        val range = red..yellow
+
+        assertTrue { range.contains(Color.MAGENTA) }
+        assertFalse { range.contains(Color.BLUE) }
+    }
+}

core-kotlin-2/src/test/kotlin/com/baeldung/range/FilterTest.kt

@@ -0,0 +1,24 @@
+package com.baeldung.range
+
+import org.junit.Test
+import kotlin.test.assertEquals
+
+class FilterTest {
+
+    val r = 1..10
+
+    @Test
+    fun filterTest() {
+        assertEquals(listOf(2, 4, 6, 8, 10), r.filter { it -> it % 2 == 0 }.toList())
+    }
+
+    @Test
+    fun mapTest() {
+        assertEquals(listOf(1, 4, 9, 16, 25, 36, 49, 64, 81, 100), r.map { it -> it * it }.toList())
+    }
+
+    @Test
+    fun reduceTest() {
+        assertEquals(55, r.reduce { a, b -> a + b })
+    }
+}

core-kotlin-2/src/test/kotlin/com/baeldung/range/FirstLastTest.kt

@@ -0,0 +1,22 @@
+package com.baeldung.range
+
+import org.junit.Test
+import kotlin.test.assertEquals
+
+class FirstLastTest {
+
+    @Test
+    fun testFirst() {
+        assertEquals(1, (1..9).first)
+    }
+
+    @Test
+    fun testLast() {
+        assertEquals(9, (1..9).last)
+    }
+
+    @Test
+    fun testStep() {
+        assertEquals(2, (1..9 step 2).step)
+    }
+}

core-kotlin-2/src/test/kotlin/com/baeldung/range/OtherRangeFunctionsTest.kt

@@ -0,0 +1,40 @@
+package com.baeldung.range
+
+import org.junit.Test
+import kotlin.test.assertEquals
+
+class OtherRangeFunctionsTest {
+
+    val r = 1..20
+    val repeated = listOf(1, 1, 2, 4, 4, 6, 10)
+
+    @Test
+    fun testMin() {
+        assertEquals(1, r.min())
+    }
+
+    @Test
+    fun testMax() {
+        assertEquals(20, r.max())
+    }
+
+    @Test
+    fun testSum() {
+        assertEquals(210, r.sum())
+    }
+
+    @Test
+    fun testAverage() {
+        assertEquals(10.5, r.average())
+    }
+
+    @Test
+    fun testCount() {
+        assertEquals(20, r.count())
+    }
+
+    @Test
+    fun testDistinct() {
+        assertEquals(listOf(1, 2, 4, 6, 10), repeated.distinct())
+    }
+}

core-kotlin-2/src/test/kotlin/com/baeldung/range/RangeTest.kt

@@ -0,0 +1,22 @@
+package com.baeldung.range
+
+import org.junit.Test
+import kotlin.test.assertEquals
+
+class RangeTest {
+
+    @Test
+    fun testRange() {
+        assertEquals(listOf(1,2,3), (1.rangeTo(3).toList()))
+    }
+
+    @Test
+    fun testDownTo(){
+        assertEquals(listOf(3,2,1), (3.downTo(1).toList()))
+    }
+
+    @Test
+    fun testUntil(){
+        assertEquals(listOf(1,2), (1.until(3).toList()))
+    }
+}

core-kotlin-2/src/test/kotlin/com/baeldung/range/ReverseRangeTest.kt

@@ -0,0 +1,12 @@
+package com.baeldung.range
+
+import org.junit.Test
+import kotlin.test.assertEquals
+
+class ReverseRangeTest {
+
+    @Test
+    fun reversedTest() {
+        assertEquals(listOf(9, 6, 3), (1..9).reversed().step(3).toList())
+    }
+}

core-kotlin-2/src/test/kotlin/com/baeldung/range/StepTest.kt

@@ -0,0 +1,17 @@
+package com.baeldung.range
+
+import org.junit.Test
+import kotlin.test.assertEquals
+
+class StepTest {
+
+    @Test
+    fun testStep() {
+        assertEquals(listOf(1, 3, 5, 7, 9), (1..9 step 2).toList())
+    }
+
+    @Test
+    fun testStepDown() {
+        assertEquals(listOf(9, 7, 5, 3, 1), (9 downTo 1 step 2).toList())
+    }
+}

core-kotlin-2/src/test/kotlin/com/baeldung/range/UntilRangeTest.kt

@@ -0,0 +1,12 @@
+package com.baeldung.range
+
+import org.junit.Test
+import kotlin.test.assertEquals
+
+class UntilRangeTest {
+
+    @Test
+    fun testUntil() {
+        assertEquals(listOf(1, 2, 3, 4), (1 until 5).toList())
+    }
+}

core-kotlin/README.md

@@ -55,3 +55,4 @@
 - [Building DSLs in Kotlin](https://www.baeldung.com/kotlin-dsl)
 - [Static Methods Behavior in Kotlin](https://www.baeldung.com/kotlin-static-methods)
 - [Inline Functions in Kotlin](https://www.baeldung.com/kotlin-inline-functions)
+- [Delegation Pattern in Kotlin](https://www.baeldung.com/kotlin-delegation-pattern)

gson/README.md

@@ -12,4 +12,5 @@
 - [Working with Primitive Values in Gson](https://www.baeldung.com/java-gson-primitives)
 - [Convert String to JsonObject with Gson](https://www.baeldung.com/gson-string-to-jsonobject)
 - [Mapping Multiple JSON Fields to One Java Field](https://www.baeldung.com/json-multiple-fields-single-java-field)
+- [Serializing and Deserializing a List with Gson](https://www.baeldung.com/gson-list)
 

jackson-2/README.md

@@ -6,4 +6,4 @@
 The "REST With Spring" Classes: http://bit.ly/restwithspring
 
 ### Relevant Articles: 
-- [Mapping Multiple JSON Fields to One Java Field](https://www.baeldung.com/json-multiple-fields-single-java-field)
+- [Mapping Multiple JSON Fields to a Single Java Field](https://www.baeldung.com/json-multiple-fields-single-java-field)

java-collections-maps-2/pom.xml

@@ -0,0 +1,45 @@
+<?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>java-collections-maps-2</artifactId>
+    <version>0.1.0-SNAPSHOT</version>
+    <name>java-collections-maps-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>org.eclipse.collections</groupId>
+            <artifactId>eclipse-collections</artifactId>
+            <version>${eclipse-collections.version}</version>
+        </dependency>
+        <dependency>
+            <groupId>net.sf.trove4j</groupId>
+            <artifactId>trove4j</artifactId>
+            <version>3.0.2</version>
+        </dependency>
+        <dependency>
+            <groupId>it.unimi.dsi</groupId>
+            <artifactId>fastutil</artifactId>
+            <version>8.1.0</version>
+        </dependency>
+        <dependency>
+            <groupId>colt</groupId>
+            <artifactId>colt</artifactId>
+            <version>1.2.0</version>
+        </dependency>
+    </dependencies>
+
+    <properties>
+        <eclipse-collections.version>8.2.0</eclipse-collections.version>
+    </properties>
+
+</project>

java-collections-maps-2/src/main/java/com/baeldung/map/PrimitiveMaps.java

@@ -0,0 +1,69 @@
+package com.baeldung.map;
+
+import cern.colt.map.AbstractIntDoubleMap;
+import cern.colt.map.OpenIntDoubleHashMap;
+import gnu.trove.map.TDoubleIntMap;
+import gnu.trove.map.hash.TDoubleIntHashMap;
+import it.unimi.dsi.fastutil.ints.Int2BooleanMap;
+import it.unimi.dsi.fastutil.ints.Int2BooleanOpenHashMap;
+import it.unimi.dsi.fastutil.ints.Int2BooleanSortedMap;
+import it.unimi.dsi.fastutil.ints.Int2BooleanSortedMaps;
+import org.eclipse.collections.api.map.primitive.ImmutableIntIntMap;
+import org.eclipse.collections.api.map.primitive.MutableIntIntMap;
+import org.eclipse.collections.api.map.primitive.MutableObjectDoubleMap;
+import org.eclipse.collections.impl.factory.primitive.IntIntMaps;
+import org.eclipse.collections.impl.factory.primitive.ObjectDoubleMaps;
+
+public class PrimitiveMaps {
+
+    public static void main(String[] args) {
+
+        eclipseCollectionsMap();
+        troveMap();
+        coltMap();
+        fastutilMap();
+    }
+
+    private static void fastutilMap() {
+        Int2BooleanMap int2BooleanMap = new Int2BooleanOpenHashMap();
+        int2BooleanMap.put(1, true);
+        int2BooleanMap.put(7, false);
+        int2BooleanMap.put(4, true);
+
+        boolean value = int2BooleanMap.get(1);
+
+        Int2BooleanSortedMap int2BooleanSorted = Int2BooleanSortedMaps.EMPTY_MAP;
+    }
+
+    private static void coltMap() {
+        AbstractIntDoubleMap map = new OpenIntDoubleHashMap();
+        map.put(1, 4.5);
+        double value = map.get(1);
+    }
+
+    private static void eclipseCollectionsMap() {
+        MutableIntIntMap mutableIntIntMap = IntIntMaps.mutable.empty();
+        mutableIntIntMap.addToValue(1, 1);
+
+        ImmutableIntIntMap immutableIntIntMap = IntIntMaps.immutable.empty();
+
+        MutableObjectDoubleMap<String> dObject = ObjectDoubleMaps.mutable.empty();
+        dObject.addToValue("price", 150.5);
+        dObject.addToValue("quality", 4.4);
+        dObject.addToValue("stability", 0.8);
+    }
+
+    private static void troveMap() {
+        double[] doubles = new double[] {1.2, 4.5, 0.3};
+        int[] ints = new int[] {1, 4, 0};
+
+        TDoubleIntMap doubleIntMap = new TDoubleIntHashMap(doubles, ints);
+
+        doubleIntMap.put(1.2, 22);
+        doubleIntMap.put(4.5, 16);
+
+        doubleIntMap.adjustValue(1.2, 1);
+        doubleIntMap.adjustValue(4.5, 4);
+        doubleIntMap.adjustValue(0.3, 7);
+    }
+}

java-streams/README.md

@@ -17,3 +17,4 @@
 - [Java Stream Filter with Lambda Expression](https://www.baeldung.com/java-stream-filter-lambda)
 - [Counting Matches on a Stream Filter](https://www.baeldung.com/java-stream-filter-count)
 - [Java 8 Streams peek() API](https://www.baeldung.com/java-streams-peek-api)
+- [Working With Maps Using Streams](https://www.baeldung.com/java-maps-streams)

lombok/README.md

@@ -6,4 +6,5 @@
 - [Lombok Builder with Default Value](https://www.baeldung.com/lombok-builder-default-value)
 - [Lombok Builder with Custom Setter](https://www.baeldung.com/lombok-builder-custom-setter)
 - [Setting up Lombok with Eclipse and Intellij](https://www.baeldung.com/lombok-ide)
+- [Using the @Singular Annotation with Lombok Builders](https://www.baeldung.com/lombok-builder-singular)
 

lombok/src/main/java/com/baeldung/lombok/builder/singular/Person.java

@@ -0,0 +1,25 @@
+package com.baeldung.lombok.builder.singular;
+
+import lombok.Builder;
+import lombok.Getter;
+import lombok.Singular;
+
+import java.time.LocalDate;
+import java.util.Date;
+import java.util.List;
+import java.util.Map;
+import java.util.Set;
+
+@Getter
+@Builder
+public class Person {
+
+    private final String givenName;
+    private final String additionalName;
+    private final String familyName;
+
+    private final List<String> tags;
+    @Singular private final List<String> interests;
+    @Singular private final Set<String> skills;
+    @Singular private final Map<String, LocalDate> awards;
+}

lombok/src/main/java/com/baeldung/lombok/builder/singular/Sea.java

@@ -0,0 +1,14 @@
+package com.baeldung.lombok.builder.singular;
+
+import java.util.List;
+import lombok.Builder;
+import lombok.Getter;
+import lombok.Singular;
+
+@Getter
+@Builder
+public class Sea {
+
+    @Singular private final List<String> grasses;
+    @Singular("oneFish") private final List<String> fish;
+}

lombok/src/test/java/com/baeldung/lombok/builder/singular/BuilderWithSingularSupportForCollectionsUnitTest.java

@@ -0,0 +1,192 @@
+package com.baeldung.lombok.builder.singular;
+
+import org.junit.Test;
+
+import java.time.LocalDate;
+import java.util.ArrayList;
+import java.util.Arrays;
+import java.util.List;
+
+import static org.hamcrest.MatcherAssert.assertThat;
+import static org.hamcrest.Matchers.*;
+
+public class BuilderWithSingularSupportForCollectionsUnitTest {
+
+    @Test
+    public void canAddMultipleElementsAsNewCollection() throws Exception {
+        Person person = Person.builder()
+            .givenName("Aaron")
+            .additionalName("A")
+            .familyName("Aardvark")
+            .tags(Arrays.asList("fictional", "incidental"))
+            .build();
+
+        assertThat(person.getTags(), containsInAnyOrder("fictional", "incidental"));
+    }
+
+    @Test
+    public void canUpdateCollectionAfterBuildIfMutableCollectionPassedToBuilder() throws Exception {
+
+        List<String> tags = new ArrayList();
+        tags.add("fictional");
+        tags.add("incidental");
+        Person person = Person.builder()
+            .givenName("Aaron")
+            .additionalName("A")
+            .familyName("Aardvark")
+            .tags(tags)
+            .build();
+        person.getTags()
+            .clear();
+        person.getTags()
+            .add("non-fictional");
+        person.getTags()
+            .add("important");
+
+        assertThat(person.getTags(), containsInAnyOrder("non-fictional", "important"));
+    }
+
+    @Test(expected = UnsupportedOperationException.class)
+    public void cannotUpdateCollectionAfterBuildIfImmutableCollectionPassedToBuilder() throws Exception {
+        List<String> tags = Arrays.asList("fictional", "incidental");
+        Person person = Person.builder()
+            .givenName("Aaron")
+            .additionalName("A")
+            .familyName("Aardvark")
+            .tags(tags)
+            .build();
+        person.getTags()
+            .clear();
+    }
+
+    @Test
+    public void canAssignToSingularAnnotatedCollectionOneByOne() throws Exception {
+
+        Person person = Person.builder()
+            .givenName("Aaron")
+            .additionalName("A")
+            .familyName("Aardvark")
+            .interest("history")
+            .interest("sport")
+            .build();
+
+        assertThat(person.getInterests(), containsInAnyOrder("sport", "history"));
+    }
+
+    @Test(expected = UnsupportedOperationException.class)
+    public void singularAnnotatedBuilderCreatesImmutableCollection() throws Exception {
+
+        Person person = Person.builder()
+            .givenName("Aaron")
+            .additionalName("A")
+            .familyName("Aardvark")
+            .interest("history")
+            .interest("sport")
+            .build();
+        person.getInterests()
+            .clear();
+    }
+
+    @Test
+    public void unpopulatedListsCreatedAsNullIfNotSingularButEmptyArrayIfSingular() throws Exception {
+
+        Person person = Person.builder()
+            .givenName("Aaron")
+            .additionalName("A")
+            .familyName("Aardvark")
+            .build();
+        assertThat(person.getInterests(), hasSize(0));
+        assertThat(person.getSkills(), hasSize(0));
+        assertThat(person.getAwards()
+            .keySet(), hasSize(0));
+        assertThat(person.getTags(), is(nullValue()));
+    }
+
+    @Test
+    public void singularSupportsSetsToo() throws Exception {
+
+        Person person = Person.builder()
+            .givenName("Aaron")
+            .additionalName("A")
+            .familyName("Aardvark")
+            .skill("singing")
+            .skill("dancing")
+            .build();
+        assertThat(person.getSkills(), contains("singing", "dancing"));
+    }
+
+    @Test
+    public void singularSetsAreLenientWithDuplicates() throws Exception {
+
+        Person person = Person.builder()
+            .givenName("Aaron")
+            .additionalName("A")
+            .familyName("Aardvark")
+            .interest("singing")
+            .interest("singing")
+            .skill("singing")
+            .skill("singing")
+            .build();
+        assertThat(person.getInterests(), contains("singing", "singing"));
+        assertThat(person.getSkills(), contains("singing"));
+    }
+
+    @Test
+    public void singularSupportsMapsToo() throws Exception {
+
+        Person person = Person.builder()
+            .givenName("Aaron")
+            .additionalName("A")
+            .familyName("Aardvark")
+            .award("Singer of the Year", LocalDate.now()
+                .minusYears(5))
+            .award("Best Dancer", LocalDate.now()
+                .minusYears(2))
+            .build();
+        assertThat(person.getAwards()
+            .keySet(), contains("Singer of the Year", "Best Dancer"));
+        assertThat(person.getAwards()
+            .get("Best Dancer"),
+            is(LocalDate.now()
+                .minusYears(2)));
+    }
+
+    @Test
+    public void singularIsLenientWithMapKeys() throws Exception {
+
+        Person person = Person.builder()
+            .givenName("Aaron")
+            .additionalName("A")
+            .familyName("Aardvark")
+            .award("Best Dancer", LocalDate.now()
+                .minusYears(5))
+            .award("Best Dancer", LocalDate.now()
+                .minusYears(4))
+            .award("Best Dancer", LocalDate.now()
+                .minusYears(3))
+            .award("Best Dancer", LocalDate.now()
+                .minusYears(2))
+            .award("Best Dancer", LocalDate.now()
+                .minusYears(1))
+            .build();
+        assertThat(person.getAwards()
+            .keySet(), hasSize(1));
+        assertThat(person.getAwards()
+            .get("Best Dancer"),
+            is(LocalDate.now()
+                .minusYears(1)));
+    }
+
+    @Test
+    public void wordsWithNonStandardPlurals() throws Exception {
+        Sea sea = Sea.builder()
+            .grass("Dulse")
+            .grass("Kelp")
+            .oneFish("Cod")
+            .oneFish("Mackerel")
+            .build();
+        assertThat(sea.getGrasses(), contains("Dulse", "Kelp"));
+        assertThat(sea.getFish(), contains("Cod", "Mackerel"));
+    }
+
+}

maven/README.md

@@ -15,3 +15,4 @@
 - [Use the Latest Version of a Dependency in Maven](https://www.baeldung.com/maven-dependency-latest-version)
 - [Multi-Module Project with Maven](https://www.baeldung.com/maven-multi-module)
 - [Maven Enforcer Plugin](https://www.baeldung.com/maven-enforcer-plugin)
+- [Eclipse Error: web.xml is missing and failOnMissingWebXml is set to true](https://www.baeldung.com/eclipse-error-web-xml-missing)

patterns/README.md

@@ -1,3 +1,4 @@
 ### Relevant Articles:
 - [A Guide to the Front Controller Pattern in Java](http://www.baeldung.com/java-front-controller-pattern)
 - [Introduction to Intercepting Filter Pattern in Java](http://www.baeldung.com/intercepting-filter-pattern-in-java)
+- [Introduction to the Null Object Pattern](https://www.baeldung.com/java-null-object-pattern)

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

@@ -7,3 +7,4 @@
 - [Batch Processing in JDBC](http://www.baeldung.com/jdbc-batch-processing)
 - [Introduction to the JDBC RowSet Interface in Java](http://www.baeldung.com/java-jdbc-rowset)
 - [A Simple Guide to Connection Pooling in Java](https://www.baeldung.com/java-connection-pooling)
+- [Guide to the JDBC ResultSet Interface](https://www.baeldung.com/jdbc-resultset)

persistence-modules/java-jpa/README.md

@@ -6,3 +6,4 @@
 - [JPA Entity Graph](https://www.baeldung.com/jpa-entity-graph)
 - [JPA 2.2 Support for Java 8 Date/Time Types](https://www.baeldung.com/jpa-java-time)
 - [Converting Between LocalDate and SQL Date](https://www.baeldung.com/java-convert-localdate-sql-date)
+- [Combining JPA And/Or Criteria Predicates](https://www.baeldung.com/jpa-and-or-criteria-predicates)

persistence-modules/spring-boot-persistence-mongodb/README.md

@@ -1,3 +1,4 @@
 # Relevant Articles
 
 - [Auto-Generated Field for MongoDB using Spring Boot](https://www.baeldung.com/spring-boot-mongodb-auto-generated-field)
+- [Spring Boot Integration Testing with Embedded MongoDB](http://www.baeldung.com/spring-boot-embedded-mongodb)

persistence-modules/spring-boot-persistence-mongodb/pom.xml

@@ -25,6 +25,11 @@
             <groupId>org.springframework.boot</groupId>
             <artifactId>spring-boot-starter-data-mongodb</artifactId>
         </dependency>
+        <dependency>
+            <groupId>de.flapdoodle.embed</groupId>
+            <artifactId>de.flapdoodle.embed.mongo</artifactId>
+            <scope>test</scope>
+        </dependency>
         <!-- JUnit Jupiter dependencies -->
         <dependency>
             <groupId>org.junit.jupiter</groupId>

persistence-modules/spring-boot-persistence-mongodb/src/test/java/com/baeldung/mongodb/MongoDbSpringIntegrationTest.java

@@ -2,7 +2,6 @@ package com.baeldung.mongodb;
 
 import static org.assertj.core.api.Assertions.assertThat;
 
-import org.baeldung.boot.Application;
 import org.junit.jupiter.api.DisplayName;
 import org.junit.jupiter.api.Test;
 import org.junit.jupiter.api.extension.ExtendWith;
@@ -12,10 +11,11 @@ import org.springframework.data.mongodb.core.MongoTemplate;
 import org.springframework.test.context.ContextConfiguration;
 import org.springframework.test.context.junit.jupiter.SpringExtension;
 
+import com.baeldung.SpringBootPersistenceApplication;
 import com.mongodb.BasicDBObjectBuilder;
 import com.mongodb.DBObject;
 
-@ContextConfiguration(classes = Application.class)
+@ContextConfiguration(classes = SpringBootPersistenceApplication.class)
 @DataMongoTest
 @ExtendWith(SpringExtension.class)
 public class MongoDbSpringIntegrationTest {

persistence-modules/spring-boot-persistence/src/main/java/com/baeldung/exists/Car.java

@@ -0,0 +1,48 @@
+package com.baeldung.exists;
+
+import javax.persistence.Entity;
+import javax.persistence.GeneratedValue;
+import javax.persistence.Id;
+
+/**
+ * @author paullatzelsperger
+ * @since 2019-03-20
+ */
+@Entity
+public class Car {
+
+    @Id
+    @GeneratedValue
+    private int id;
+    private Integer power;
+    private String model;
+
+    Car() {
+
+    }
+
+    public Car(int power, String model) {
+        this.power = power;
+        this.model = model;
+    }
+
+    public Integer getPower() {
+        return power;
+    }
+
+    public void setPower(Integer power) {
+        this.power = power;
+    }
+
+    public String getModel() {
+        return model;
+    }
+
+    public void setModel(String model) {
+        this.model = model;
+    }
+
+    public int getId() {
+        return id;
+    }
+}

persistence-modules/spring-boot-persistence/src/main/java/com/baeldung/exists/CarRepository.java

@@ -0,0 +1,24 @@
+package com.baeldung.exists;
+
+import org.springframework.data.jpa.repository.JpaRepository;
+import org.springframework.data.jpa.repository.Query;
+import org.springframework.data.repository.query.Param;
+import org.springframework.stereotype.Repository;
+
+/**
+ * @author paullatzelsperger
+ * @since 2019-03-20
+ */
+@Repository
+public interface CarRepository extends JpaRepository<Car, Integer> {
+
+    boolean existsCarByPower(int power);
+
+    boolean existsCarByModel(String model);
+
+    @Query("select case when count(c)> 0 then true else false end from Car c where c.model = :model")
+    boolean existsCarExactCustomQuery(@Param("model") String model);
+
+    @Query("select case when count(c)> 0 then true else false end from Car c where lower(c.model) like lower(:model)")
+    boolean existsCarLikeCustomQuery(@Param("model") String model);
+}

persistence-modules/spring-boot-persistence/src/test/java/com/baeldung/exists/CarRepositoryIntegrationTest.java

@@ -0,0 +1,86 @@
+package com.baeldung.exists;
+
+import static org.assertj.core.api.Assertions.assertThat;
+import static org.springframework.data.domain.ExampleMatcher.GenericPropertyMatchers.ignoreCase;
+
+import org.junit.After;
+import org.junit.Before;
+import org.junit.Test;
+import org.junit.runner.RunWith;
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.boot.test.context.SpringBootTest;
+import org.springframework.data.domain.Example;
+import org.springframework.data.domain.ExampleMatcher;
+import org.springframework.test.context.junit4.SpringRunner;
+
+import java.util.Arrays;
+import java.util.List;
+
+@RunWith(SpringRunner.class)
+@SpringBootTest
+public class CarRepositoryIntegrationTest {
+
+    @Autowired
+    private CarRepository repository;
+    private int searchId;
+
+    @Before
+    public void setup() {
+        List<Car> cars = repository.saveAll(Arrays.asList(new Car(200, "BMW"), new Car(300, "Audi")));
+        searchId = cars.get(0).getId();
+    }
+
+    @After
+    public void teardown() {
+        repository.deleteAll();
+    }
+
+    @Test
+    public void whenIdIsCorrect_thenExistsShouldReturnTrue() {
+        assertThat(repository.existsById(searchId)).isTrue();
+    }
+
+    @Test
+    public void givenExample_whenExists_thenIsTrue() {
+        ExampleMatcher modelMatcher = ExampleMatcher.matching()
+                .withIgnorePaths("id") // must explicitly ignore -> PK
+                .withMatcher("model", ignoreCase());
+        Car probe = new Car();
+        probe.setModel("bmw");
+
+        Example<Car> example = Example.of(probe, modelMatcher);
+
+        assertThat(repository.exists(example)).isTrue();
+    }
+
+    @Test
+    public void givenPower_whenExists_thenIsFalse() {
+        assertThat(repository.existsCarByPower(200)).isTrue();
+        assertThat(repository.existsCarByPower(800)).isFalse();
+    }
+
+    @Test
+    public void existsByDerivedQuery_byModel() {
+        assertThat(repository.existsCarByModel("Audi")).isTrue();
+        assertThat(repository.existsCarByModel("audi")).isFalse();
+        assertThat(repository.existsCarByModel("AUDI")).isFalse();
+        assertThat(repository.existsCarByModel("")).isFalse();
+    }
+
+    @Test
+    public void givenModelName_whenExistsExact_thenIsTrue() {
+        assertThat(repository.existsCarExactCustomQuery("BMW")).isTrue();
+        assertThat(repository.existsCarExactCustomQuery("Bmw")).isFalse();
+        assertThat(repository.existsCarExactCustomQuery("bmw")).isFalse();
+        assertThat(repository.existsCarExactCustomQuery("")).isFalse();
+    }
+
+    @Test
+    public void givenModelName_whenExistsLike_thenIsTrue() {
+        assertThat(repository.existsCarLikeCustomQuery("BMW")).isTrue();
+        assertThat(repository.existsCarLikeCustomQuery("Bmw")).isTrue();
+        assertThat(repository.existsCarLikeCustomQuery("bmw")).isTrue();
+        assertThat(repository.existsCarLikeCustomQuery("")).isFalse();
+    }
+
+}

persistence-modules/spring-data-jpa/README.md

@@ -22,6 +22,7 @@
 - [Spring Data JPA Query by Example](https://www.baeldung.com/spring-data-query-by-example)
 - [DB Integration Tests with Spring Boot and Testcontainers](https://www.baeldung.com/spring-boot-testcontainers-integration-test)
 - [Spring Data JPA @Modifying Annotation](https://www.baeldung.com/spring-data-jpa-modifying-annotation)
+- [Spring Data JPA Batch Inserts](https://www.baeldung.com/spring-data-jpa-batch-inserts)
 
 ### Eclipse Config 
 After importing the project into Eclipse, you may see the following error:  

persistence-modules/spring-data-jpa/pom.xml

@@ -53,6 +53,15 @@
             <artifactId>spring-security-test</artifactId>
             <scope>test</scope>
         </dependency>
+        <dependency>
+            <groupId>org.springframework.boot</groupId>
+            <artifactId>spring-boot-starter-web</artifactId>
+        </dependency>
+        <dependency>
+        <groupId>org.springframework.boot</groupId>
+           <artifactId>spring-boot-starter-test</artifactId>
+           <scope>test</scope>
+        </dependency>
 
         <dependency>
             <groupId>com.google.guava</groupId>

persistence-modules/spring-data-jpa/src/main/java/com/baeldung/batchinserts/CustomerController.java

@@ -0,0 +1,43 @@
+package com.baeldung.batchinserts;
+
+import java.net.URISyntaxException;
+import java.util.Arrays;
+import java.util.List;
+
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.http.ResponseEntity;
+import org.springframework.web.bind.annotation.PostMapping;
+import org.springframework.web.bind.annotation.RestController;
+
+import com.baeldung.batchinserts.model.Customer;
+import com.baeldung.batchinserts.repository.CustomerRepository;
+
+/**
+ * A simple controller to test the JPA CrudRepository operations
+ * controllers
+ * 
+ * @author ysharma2512
+ *
+ */
+@RestController
+public class CustomerController {
+
+    @Autowired
+    CustomerRepository customerRepository;
+
+    public CustomerController(CustomerRepository customerRepository2) {
+        this.customerRepository = customerRepository2;
+    }
+
+    @PostMapping("/customers")
+    public ResponseEntity<List<Customer>> insertCustomers() throws URISyntaxException {
+        Customer c1 = new Customer("James", "Gosling");
+        Customer c2 = new Customer("Doug", "Lea");
+        Customer c3 = new Customer("Martin", "Fowler");
+        Customer c4 = new Customer("Brian", "Goetz");
+        List<Customer> customers = Arrays.asList(c1, c2, c3, c4);
+        customerRepository.saveAll(customers);
+        return ResponseEntity.ok(customers);
+    }
+
+}

persistence-modules/spring-data-jpa/src/main/java/com/baeldung/batchinserts/model/Customer.java

@@ -0,0 +1,56 @@
+package com.baeldung.batchinserts.model;
+
+import javax.persistence.Entity;
+import javax.persistence.GeneratedValue;
+import javax.persistence.GenerationType;
+import javax.persistence.Id;
+
+/**
+ * Customer Entity class
+ * @author ysharma2512
+ *
+ */
+@Entity
+public class Customer {
+
+    @Id
+    @GeneratedValue(strategy = GenerationType.AUTO)
+    private Long id;
+    private String firstName;
+    private String lastName;
+
+    public Customer(String firstName, String lastName) {
+        this.firstName = firstName;
+        this.lastName = lastName;
+    }
+
+    public Long getId() {
+        return id;
+    }
+
+    public void setId(Long id) {
+        this.id = id;
+    }
+
+    public String getFirstName() {
+        return firstName;
+    }
+
+    public void setFirstName(String firstName) {
+        this.firstName = firstName;
+    }
+
+    public String getLastName() {
+        return lastName;
+    }
+
+    public void setLastName(String lastName) {
+        this.lastName = lastName;
+    }
+
+    @Override
+    public String toString() {
+        return String.format("Customer[id=%d, firstName='%s', lastName='%s']", id, firstName, lastName);
+    }
+
+}

persistence-modules/spring-data-jpa/src/main/java/com/baeldung/batchinserts/repository/CustomerRepository.java

@@ -0,0 +1,15 @@
+package com.baeldung.batchinserts.repository;
+
+import org.springframework.data.repository.CrudRepository;
+
+import com.baeldung.batchinserts.model.Customer;
+
+/**
+ * JPA CrudRepository interface
+ * 
+ * @author ysharma2512
+ *
+ */
+public interface CustomerRepository extends CrudRepository<Customer, Long>{
+
+}

persistence-modules/spring-data-jpa/src/main/resources/application.properties

@@ -15,3 +15,8 @@ hibernate.cache.region.factory_class=org.hibernate.cache.ehcache.EhCacheRegionFa
 spring.datasource.data=import_entities.sql
 
 spring.main.allow-bean-definition-overriding=true
+
+spring.jpa.properties.hibernate.jdbc.batch_size=4
+spring.jpa.properties.hibernate.order_inserts=true
+spring.jpa.properties.hibernate.order_updates=true
+spring.jpa.properties.hibernate.generate_statistics=true

persistence-modules/spring-data-jpa/src/test/java/com/baeldung/batchinserts/BatchInsertIntegrationTest.java

@@ -0,0 +1,44 @@
+package com.baeldung.batchinserts;
+
+import static org.springframework.test.web.servlet.request.MockMvcRequestBuilders.post;
+import static org.springframework.test.web.servlet.result.MockMvcResultMatchers.status;
+
+import org.junit.Before;
+import org.junit.Test;
+import org.junit.runner.RunWith;
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.boot.test.autoconfigure.web.servlet.AutoConfigureMockMvc;
+import org.springframework.boot.test.context.SpringBootTest;
+import org.springframework.test.context.ContextConfiguration;
+import org.springframework.test.context.junit4.SpringRunner;
+import org.springframework.test.web.servlet.MockMvc;
+import org.springframework.test.web.servlet.setup.MockMvcBuilders;
+
+import com.baeldung.batchinserts.CustomerController;
+import com.baeldung.batchinserts.repository.CustomerRepository;
+import com.baeldung.config.PersistenceConfiguration;
+import com.baeldung.config.PersistenceProductConfiguration;
+import com.baeldung.config.PersistenceUserConfiguration;
+
+@RunWith(SpringRunner.class)
+@SpringBootTest
+@AutoConfigureMockMvc
+@ContextConfiguration(classes = { PersistenceConfiguration.class, PersistenceProductConfiguration.class, PersistenceUserConfiguration.class })
+public class BatchInsertIntegrationTest {
+
+    @Autowired
+    private CustomerRepository customerRepository;
+    private MockMvc mockMvc;
+    @Before
+    public void setUp() throws Exception {
+        mockMvc = MockMvcBuilders.standaloneSetup( new CustomerController(customerRepository))
+            .build();
+    }
+
+    @Test
+    public void whenInsertingCustomers_thenCustomersAreCreated() throws Exception {
+        this.mockMvc.perform(post("/customers"))
+            .andExpect(status().isOk());
+    }    
+   
+}

pom.xml

@@ -577,12 +577,12 @@
                 <module>spring-4</module>
                 
                 <module>spring-5</module>
+                <module>spring-5-webflux</module>
                 <module>spring-5-mvc</module>
                 <module>spring-5-reactive</module>
                 <module>spring-5-reactive-client</module>
                 <module>spring-5-reactive-oauth</module>
                 <module>spring-5-reactive-security</module>
-                <module>spring-5-reactive-netty</module>
                 <module>spring-5-security</module>
                 <module>spring-5-security-oauth</module>
                 

reactor-core/README.md

@@ -2,3 +2,4 @@
 
 - [Intro To Reactor Core](http://www.baeldung.com/reactor-core)
 - [Combining Publishers in Project Reactor](http://www.baeldung.com/reactor-combine-streams)
+- [Programmatically Creating Sequences with Project Reactor](https://www.baeldung.com/flux-sequences-reactor)

spring-5-reactive-netty/.gitignore

@@ -1,11 +0,0 @@
-# Folders #
-**/.idea
-**/target
-
-# Files #
-*.log
-
-# Packaged files #
-*.jar
-*.war
-*.ear

spring-5-reactive-netty/README.md

@@ -1,3 +0,0 @@
-## Spring 5 Reactive Project With Netty Server
-
-Includes configuration options for Netty server.

spring-5-reactive-netty/pom.xml

@@ -1,51 +0,0 @@
-<?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</groupId>
-    <artifactId>spring-5-reactive-netty</artifactId>
-    <version>0.0.1-SNAPSHOT</version>
-    <name>spring-5-reactive-netty</name>
-    <packaging>jar</packaging>
-    <description>Spring 5 sample project about reactive web with Netty server</description>
-
-    <parent>
-        <groupId>com.baeldung</groupId>
-        <artifactId>parent-boot-2</artifactId>
-        <version>0.0.1-SNAPSHOT</version>
-        <relativePath>../parent-boot-2</relativePath>
-    </parent>
-
-    <dependencies>
-        <dependency>
-            <groupId>org.springframework.boot</groupId>
-            <artifactId>spring-boot-starter-webflux</artifactId>
-        </dependency>
-
-        <dependency>
-            <groupId>org.projectlombok</groupId>
-            <artifactId>lombok</artifactId>
-        </dependency>
-
-        <dependency>
-            <groupId>org.springframework.boot</groupId>
-            <artifactId>spring-boot-devtools</artifactId>
-            <scope>runtime</scope>
-        </dependency>
-
-        <dependency>
-            <groupId>org.springframework.boot</groupId>
-            <artifactId>spring-boot-starter-test</artifactId>
-            <scope>test</scope>
-        </dependency>
-    </dependencies>
-
-    <build>
-        <plugins>
-            <plugin>
-                <groupId>org.springframework.boot</groupId>
-                <artifactId>spring-boot-maven-plugin</artifactId>
-            </plugin>
-        </plugins>
-    </build>
-</project>

spring-5-reactive/README.md

@@ -19,3 +19,4 @@ The "REST With Spring" Classes: http://bit.ly/restwithspring
 - [Logging a Reactive Sequence](https://www.baeldung.com/spring-reactive-sequence-logging)
 - [Testing Reactive Streams Using StepVerifier and TestPublisher](https://www.baeldung.com/reactive-streams-step-verifier-test-publisher)
 - [Debugging Reactive Streams in Spring 5](https://www.baeldung.com/spring-debugging-reactive-streams)
+- [Static Content in Spring WebFlux](https://www.baeldung.com/spring-webflux-static-content)

spring-5-webflux/.gitignore

@@ -0,0 +1,2 @@
+# Files #
+*.log

spring-5-webflux/pom.xml

@@ -1,23 +1,20 @@
 <?xml version="1.0" encoding="UTF-8"?>
 
 <project xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://maven.apache.org/POM/4.0.0"
-         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>spring-5-webflux</artifactId>
     <version>1.0-SNAPSHOT</version>
-
     <name>spring-5-webflux</name>
-
     <url>http://www.baeldung.com</url>
 
-    <properties>
-        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
-        <maven.compiler.source>1.8</maven.compiler.source>
-        <maven.compiler.target>1.8</maven.compiler.target>
-        <spring-boot.version>2.0.2.RELEASE</spring-boot.version>
-    </properties>
+    <parent>
+        <groupId>com.baeldung</groupId>
+        <artifactId>parent-boot-2</artifactId>
+        <version>0.0.1-SNAPSHOT</version>
+        <relativePath>../parent-boot-2</relativePath>
+    </parent>
 
     <dependencyManagement>
         <dependencies>
@@ -58,12 +55,8 @@
     <build>
         <plugins>
             <plugin>
-                <artifactId>maven-compiler-plugin</artifactId>
-                <version>3.8.0</version>
-            </plugin>
-            <plugin>
-                <artifactId>maven-surefire-plugin</artifactId>
-                <version>2.22.1</version>
+                <groupId>org.springframework.boot</groupId>
+                <artifactId>spring-boot-maven-plugin</artifactId>
             </plugin>
         </plugins>
     </build>

spring-5-webflux/src/main/java/com/baeldung/spring/serverconfig/CustomNettyWebServerFactory.java

@@ -1,4 +1,4 @@
-package com.baeldung.serverconfig;
+package com.baeldung.spring.serverconfig;
 
 import io.netty.channel.EventLoopGroup;
 import io.netty.channel.nio.NioEventLoopGroup;

spring-5-webflux/src/main/java/com/baeldung/spring/serverconfig/GreetingController.java

@@ -1,4 +1,4 @@
-package com.baeldung.serverconfig;
+package com.baeldung.spring.serverconfig;
 
 import org.springframework.web.bind.annotation.GetMapping;
 import org.springframework.web.bind.annotation.PathVariable;

spring-5-webflux/src/main/java/com/baeldung/spring/serverconfig/GreetingService.java

@@ -1,4 +1,4 @@
-package com.baeldung.serverconfig;
+package com.baeldung.spring.serverconfig;
 
 import org.springframework.stereotype.Service;
 import reactor.core.publisher.Mono;

spring-5-webflux/src/main/java/com/baeldung/spring/serverconfig/NettyWebServerFactoryPortCustomizer.java

@@ -1,4 +1,4 @@
-package com.baeldung.serverconfig;
+package com.baeldung.spring.serverconfig;
 
 import org.springframework.boot.web.embedded.netty.NettyReactiveWebServerFactory;
 import org.springframework.boot.web.embedded.netty.NettyServerCustomizer;

spring-5-webflux/src/main/java/com/baeldung/spring/serverconfig/NettyWebServerFactorySslCustomizer.java

@@ -1,4 +1,4 @@
-package com.baeldung.serverconfig;
+package com.baeldung.spring.serverconfig;
 
 import org.springframework.boot.web.embedded.netty.NettyReactiveWebServerFactory;
 import org.springframework.boot.web.embedded.netty.SslServerCustomizer;

spring-5-webflux/src/main/java/com/baeldung/spring/serverconfig/ServerConfigApplication.java

@@ -1,4 +1,4 @@
-package com.baeldung.serverconfig;
+package com.baeldung.spring.serverconfig;
 
 import org.springframework.boot.SpringApplication;
 import org.springframework.boot.autoconfigure.SpringBootApplication;

spring-5-webflux/src/test/java/com/baeldung/spring/responsestatus/ResponseStatusControllerLiveTest.java

@@ -9,7 +9,7 @@ import org.springframework.test.web.reactive.server.WebTestClient;
 
 @RunWith(SpringRunner.class)
 @SpringBootTest(webEnvironment = SpringBootTest.WebEnvironment.RANDOM_PORT)
-public class ResponseStatusControllerTests {
+public class ResponseStatusControllerLiveTest {
 
     @Autowired
     private WebTestClient testClient;

spring-5-webflux/src/test/java/com/baeldung/spring/serverconfig/GreetingControllerIntegrationTest.java

@@ -1,4 +1,4 @@
-package com.baeldung.serverconfig;
+package com.baeldung.spring.serverconfig;
 
 import static org.mockito.Mockito.when;
 

spring-5-webflux/src/test/java/com/baeldung/spring/serverconfig/GreetingLiveTest.java

@@ -1,4 +1,4 @@
-package com.baeldung.serverconfig;
+package com.baeldung.spring.serverconfig;
 
 import io.netty.handler.ssl.SslContext;
 import io.netty.handler.ssl.SslContextBuilder;
@@ -10,7 +10,7 @@ import org.junit.runner.RunWith;
 import org.springframework.boot.test.context.SpringBootTest;
 import org.springframework.boot.test.context.SpringBootTest.WebEnvironment;
 import org.springframework.http.client.reactive.ReactorClientHttpConnector;
-import org.springframework.test.context.ActiveProfiles;
+import org.springframework.test.annotation.DirtiesContext;
 import org.springframework.test.context.junit4.SpringRunner;
 import org.springframework.test.web.reactive.server.WebTestClient;
 import org.springframework.test.web.reactive.server.WebTestClient.ResponseSpec;
@@ -18,6 +18,7 @@ import reactor.netty.http.client.HttpClient;
 
 @RunWith(SpringRunner.class)
 @SpringBootTest(webEnvironment = WebEnvironment.DEFINED_PORT)
+@DirtiesContext
 public class GreetingLiveTest {
 
     private static final String BASE_URL = "https://localhost:8443";

spring-5-webflux/src/test/java/com/baeldung/spring/serverconfig/GreetingSkipAutoConfigLiveTest.java

@@ -1,4 +1,4 @@
-package com.baeldung.serverconfig;
+package com.baeldung.spring.serverconfig;
 
 import org.springframework.test.context.ActiveProfiles;
 

spring-boot-angular-ecommerce/src/main/frontend/package.json

@@ -7,7 +7,7 @@
     "build": "ng build",
     "postbuild": "npm run deploy",
     "predeploy": "rimraf ../resources/static/ && mkdirp ../resources/static",
-    "deploy": "copyfiles -f dist/** ../resources/static",
+    "deploy": "copyfiles -f dist/frontend/** ../resources/static",
     "test": "ng test",
     "lint": "ng lint",
     "e2e": "ng e2e"

spring-boot-ops/README.md

@@ -10,3 +10,5 @@
  - [Spring Boot Console Application](http://www.baeldung.com/spring-boot-console-app)
  - [Comparing Embedded Servlet Containers in Spring Boot](http://www.baeldung.com/spring-boot-servlet-containers)
  - [Programmatically Restarting a Spring Boot Application](https://www.baeldung.com/java-restart-spring-boot-app)
+ - [Spring Properties File Outside jar](https://www.baeldung.com/spring-properties-file-outside-jar)
+ 

spring-boot-rest/README.md

@@ -10,3 +10,4 @@ Module for the articles that are part of the Spring REST E-book:
 8. [Http Message Converters with the Spring Framework](http://www.baeldung.com/spring-httpmessageconverter-rest)
 9. [ETags for REST with Spring](http://www.baeldung.com/etags-for-rest-with-spring)
 10. [Testing REST with multiple MIME types](http://www.baeldung.com/testing-rest-api-with-multiple-media-types)
+11. [Testing Web APIs with Postman Collections](https://www.baeldung.com/postman-testing-collections)

spring-boot/README.MD

@@ -28,7 +28,6 @@ The "REST With Spring" Classes: http://bit.ly/restwithspring
 - [Spring Boot Exit Codes](http://www.baeldung.com/spring-boot-exit-codes)
 - [Guide to the Favicon in Spring Boot](http://www.baeldung.com/spring-boot-favicon)
 - [Spring Shutdown Callbacks](http://www.baeldung.com/spring-shutdown-callbacks)
-- [Spring Boot Integration Testing with Embedded MongoDB](http://www.baeldung.com/spring-boot-embedded-mongodb)
 - [Container Configuration in Spring Boot 2](http://www.baeldung.com/embeddedservletcontainercustomizer-configurableembeddedservletcontainer-spring-boot)
 - [Introduction to Chaos Monkey](https://www.baeldung.com/spring-boot-chaos-monkey)
 - [Spring Component Scanning](https://www.baeldung.com/spring-component-scanning)
@@ -37,3 +36,4 @@ The "REST With Spring" Classes: http://bit.ly/restwithspring
 - [Injecting Git Information Into Spring](https://www.baeldung.com/spring-git-information)
 - [Validation in Spring Boot](https://www.baeldung.com/spring-boot-bean-validation)
 - [Entity To DTO Conversion for a Spring REST API](https://www.baeldung.com/entity-to-and-from-dto-for-a-java-spring-application)
+- [Guide to Creating and Running a Jar File in Java](https://www.baeldung.com/java-create-jar)

spring-boot/pom.xml

@@ -15,16 +15,7 @@
     </parent>
 
     <dependencies>
-        <!-- MongoDB -->
-        <dependency>
-            <groupId>org.springframework.boot</groupId>
-            <artifactId>spring-boot-starter-data-mongodb</artifactId>
-        </dependency>
-        <dependency>
-            <groupId>de.flapdoodle.embed</groupId>
-            <artifactId>de.flapdoodle.embed.mongo</artifactId>
-            <scope>test</scope>
-        </dependency>
+      
         <!-- JUnit Jupiter dependencies -->
         <dependency>
             <groupId>org.junit.jupiter</groupId>

spring-cloud/README.md

@@ -17,4 +17,5 @@
 - [Dockerizing a Spring Boot Application](http://www.baeldung.com/dockerizing-spring-boot-application)
 - [Instance Profile Credentials using Spring Cloud](http://www.baeldung.com/spring-cloud-instance-profiles)
 - [Running Spring Boot Applications With Minikube](http://www.baeldung.com/spring-boot-minikube)
+- [Introduction to Spring Cloud OpenFeign](https://www.baeldung.com/spring-cloud-openfeign)
 

spring-cloud/pom.xml

@@ -32,6 +32,7 @@
         <module>spring-cloud-zuul-eureka-integration</module>
         <module>spring-cloud-contract</module>
         <module>spring-cloud-kubernetes</module>
+        <module>spring-cloud-kubernetes-2</module>
         <module>spring-cloud-archaius</module>
         <module>spring-cloud-functions</module>        
         <module>spring-cloud-vault</module>

spring-cloud/spring-cloud-kubernetes-2/client-service/.gitignore

@@ -0,0 +1,24 @@
+target/
+!.mvn/wrapper/maven-wrapper.jar
+
+### STS ###
+.apt_generated
+.classpath
+.factorypath
+.project
+.settings
+.springBeans
+
+### IntelliJ IDEA ###
+.idea
+*.iws
+*.iml
+*.ipr
+
+### NetBeans ###
+nbproject/private/
+build/
+nbbuild/
+dist/
+nbdist/
+.nb-gradle/

spring-cloud/spring-cloud-kubernetes-2/client-service/Dockerfile

@@ -0,0 +1,5 @@
+FROM openjdk:8-jdk-alpine
+VOLUME /tmp
+COPY target/client-service-1.0-SNAPSHOT.jar app.jar
+ENV JAVA_OPTS=""
+ENTRYPOINT exec java -agentlib:jdwp=transport=dt_socket,server=y,suspend=n,address=9999 -jar /app.jar

spring-cloud/spring-cloud-kubernetes-2/client-service/client-config.yaml

@@ -0,0 +1,8 @@
+apiVersion: v1
+kind: ConfigMap
+metadata:
+  name: client-service
+data:
+  application.properties: |-
+    bean.message=Testing reload ! Message from backend is: %s <br/> Services : %s
+

spring-cloud/spring-cloud-kubernetes-2/client-service/client-service-deployment.yaml

@@ -0,0 +1,33 @@
+kind: Service
+apiVersion: v1
+metadata:
+  name: client-service
+spec:
+  selector:
+    app: client-service
+  ports:
+  - protocol: TCP
+    port: 8080
+    nodePort: 30083
+  type: NodePort
+---
+apiVersion: apps/v1
+kind: Deployment
+metadata:
+  name: client-service
+spec:
+  selector:
+      matchLabels:
+        app: client-service
+  replicas: 1
+  template:
+    metadata:
+      labels:
+        app: client-service
+    spec:
+      containers:
+        - name: client-service
+          image: client-service:latest
+          imagePullPolicy: Never
+          ports:
+            - containerPort: 8080

spring-cloud/spring-cloud-kubernetes-2/client-service/pom.xml

@@ -0,0 +1,96 @@
+<?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>client-service</artifactId>
+    <name>client-service</name>
+    <version>1.0-SNAPSHOT</version>
+
+    <parent>
+        <groupId>com.baeldung.spring.cloud</groupId>
+        <artifactId>spring-cloud-kubernetes-2</artifactId>
+        <version>1.0-SNAPSHOT</version>
+    </parent>
+
+    <properties>
+        <java.version>1.8</java.version>
+        <spring-cloud-dependencies.version>Finchley.SR2</spring-cloud-dependencies.version>
+        <spring.cloud.k8s.version>1.0.0.RELEASE</spring.cloud.k8s.version>
+    </properties>
+
+    <dependencyManagement>
+        <dependencies>
+            <dependency>
+                <groupId>org.springframework.cloud</groupId>
+                <artifactId>spring-cloud-dependencies</artifactId>
+                <version>${spring-cloud-dependencies.version}</version>
+                <type>pom</type>
+                <scope>import</scope>
+            </dependency>
+            <dependency>
+                <groupId>org.springframework.cloud</groupId>
+                <artifactId>spring-cloud-kubernetes-dependencies</artifactId>
+                <version>${spring.cloud.k8s.version}</version>
+                <type>pom</type>
+                <scope>import</scope>
+            </dependency>
+        </dependencies>
+    </dependencyManagement>
+
+    <dependencies>
+        <dependency>
+            <groupId>org.springframework.cloud</groupId>
+            <artifactId>spring-cloud-kubernetes-discovery</artifactId>
+        </dependency>
+        <dependency>
+            <groupId>org.springframework.cloud</groupId>
+            <artifactId>spring-cloud-starter-kubernetes-config</artifactId>
+        </dependency>
+        <dependency>
+            <groupId>org.springframework.boot</groupId>
+            <artifactId>spring-boot-starter-web</artifactId>
+        </dependency>
+        <dependency>
+            <groupId>org.springframework.boot</groupId>
+            <artifactId>spring-boot-starter-actuator</artifactId>
+        </dependency>
+        <dependency>
+            <groupId>org.springframework.boot</groupId>
+            <artifactId>spring-boot-starter-test</artifactId>
+            <scope>test</scope>
+        </dependency>
+        <dependency>
+            <groupId>org.springframework.cloud</groupId>
+            <artifactId>spring-cloud-starter-netflix-hystrix</artifactId>
+        </dependency>
+        <dependency>
+            <groupId>org.springframework.cloud</groupId>
+            <artifactId>spring-cloud-starter-kubernetes-ribbon</artifactId>
+        </dependency>
+        <dependency>
+            <groupId>org.springframework.cloud</groupId>
+            <artifactId>spring-cloud-starter-netflix-ribbon</artifactId>
+        </dependency>
+    </dependencies>
+
+    <build>
+        <plugins>
+            <plugin>
+                <groupId>org.springframework.boot</groupId>
+                <artifactId>spring-boot-maven-plugin</artifactId>
+                <configuration>
+                    <mainClass>com.baeldung.spring.cloud.kubernetes.client.Application</mainClass>
+                    <layout>JAR</layout>
+                </configuration>
+                <executions>
+                    <execution>
+                        <goals>
+                            <goal>repackage</goal>
+                        </goals>
+                    </execution>
+                </executions>
+            </plugin>
+        </plugins>
+    </build>
+
+</project>

spring-cloud/spring-cloud-kubernetes-2/client-service/src/main/java/com/baeldung/spring/cloud/kubernetes/client/Application.java

@@ -0,0 +1,27 @@
+package com.baeldung.spring.cloud.kubernetes.client;
+
+import org.springframework.boot.SpringApplication;
+import org.springframework.boot.autoconfigure.SpringBootApplication;
+import org.springframework.cloud.client.circuitbreaker.EnableCircuitBreaker;
+import org.springframework.cloud.client.loadbalancer.LoadBalanced;
+import org.springframework.cloud.netflix.ribbon.RibbonClient;
+import org.springframework.context.annotation.Bean;
+import org.springframework.web.client.RestTemplate;
+import org.springframework.cloud.client.discovery.EnableDiscoveryClient;
+
+@SpringBootApplication
+@EnableDiscoveryClient
+@EnableCircuitBreaker
+@RibbonClient(name = "travel-agency-service", configuration = RibbonConfiguration.class)
+public class Application {
+
+    @LoadBalanced
+    @Bean
+    RestTemplate restTemplate() {
+        return new RestTemplate();
+    }
+
+    public static void main(String[] args) {
+        SpringApplication.run(Application.class, args);
+    }
+}

spring-cloud/spring-cloud-kubernetes-2/client-service/src/main/java/com/baeldung/spring/cloud/kubernetes/client/ClientConfig.java

@@ -0,0 +1,19 @@
+package com.baeldung.spring.cloud.kubernetes.client;
+
+import org.springframework.boot.context.properties.ConfigurationProperties;
+import org.springframework.context.annotation.Configuration;
+
+@Configuration
+@ConfigurationProperties(prefix = "bean")
+public class ClientConfig {
+
+    private String message = "Message from backend is: %s <br/> Services : %s";
+
+    public String getMessage() {
+        return message;
+    }
+
+    public void setMessage(String message) {
+        this.message = message;
+    }
+}

spring-cloud/spring-cloud-kubernetes-2/client-service/src/main/java/com/baeldung/spring/cloud/kubernetes/client/ClientController.java

@@ -0,0 +1,54 @@
+package com.baeldung.spring.cloud.kubernetes.client;
+
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.cloud.client.ServiceInstance;
+import org.springframework.cloud.client.discovery.DiscoveryClient;
+import org.springframework.http.ResponseEntity;
+import org.springframework.util.CollectionUtils;
+import org.springframework.web.bind.annotation.GetMapping;
+import org.springframework.web.bind.annotation.RequestMapping;
+import org.springframework.web.bind.annotation.RestController;
+import org.springframework.web.client.RestTemplate;
+
+import java.net.UnknownHostException;
+import java.util.List;
+
+@RestController
+public class ClientController {
+
+    @Autowired
+    private DiscoveryClient discoveryClient;
+
+    @Autowired
+    private ClientConfig config;
+
+    @Autowired
+    private TravelAgencyService travelAgencyService;
+
+    @RequestMapping("/deals")
+    public String getDeals() {
+        return travelAgencyService.getDeals();
+    }
+
+    @GetMapping
+    public String load() {
+
+        RestTemplate restTemplate = new RestTemplate();
+        String resourceUrl = "http://travel-agency-service:8080";
+        ResponseEntity<String> response = restTemplate.getForEntity(resourceUrl, String.class);
+
+        String serviceList = "";
+        if (discoveryClient != null) {
+            List<String> services = this.discoveryClient.getServices();
+
+            for (String service : services) {
+
+                List<ServiceInstance> instances = this.discoveryClient.getInstances(service);
+
+                serviceList += ("[" + service + " : " + ((!CollectionUtils.isEmpty(instances)) ? instances.size() : 0) + " instances ]");
+            }
+        }
+
+        return String.format(config.getMessage(), response.getBody(), serviceList);
+    }
+}

spring-cloud/spring-cloud-kubernetes-2/client-service/src/main/java/com/baeldung/spring/cloud/kubernetes/client/RibbonConfiguration.java

@@ -0,0 +1,55 @@
+/*
+ *   Copyright (C) 2016 to the original authors.
+ *
+ *   Licensed under the Apache License, Version 2.0 (the "License");
+ *   you may not use this file except in compliance with the License.
+ *   You may obtain a copy of the License at
+ *
+ *           http://www.apache.org/licenses/LICENSE-2.0
+ *
+ *   Unless required by applicable law or agreed to in writing, software
+ *   distributed under the License is distributed on an "AS IS" BASIS,
+ *   WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ *   See the License for the specific language governing permissions and
+ *   limitations under the License.
+ */
+
+package com.baeldung.spring.cloud.kubernetes.client;
+
+import com.netflix.client.config.IClientConfig;
+import com.netflix.loadbalancer.AvailabilityFilteringRule;
+import com.netflix.loadbalancer.IPing;
+import com.netflix.loadbalancer.IRule;
+import com.netflix.loadbalancer.PingUrl;
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.context.annotation.Bean;
+
+public class RibbonConfiguration {
+
+    @Autowired
+    IClientConfig ribbonClientConfig;
+
+    /**
+     *  PingUrl will ping a URL to check the status of each server.
+     *  Say Hello has, as you’ll recall, a method mapped to the /path; that means that Ribbon will get an HTTP 200 response when it pings a running Backend Server
+     *
+     * @param  config Client configuration
+     * @return The URL to be used for the Ping
+     */
+    @Bean
+    public IPing ribbonPing(IClientConfig config) {
+        return new PingUrl();
+    }
+
+    /**
+     * AvailabilityFilteringRule will use Ribbon’s built-in circuit breaker functionality to filter out any servers in an “open-circuit” state:
+     * if a ping fails to connect to a given server, or if it gets a read failure for the server, Ribbon will consider that server “dead” until it begins to respond normally.
+     *
+     * @param  config Client configuration
+     * @return The Load Balancer rule
+     */
+    @Bean
+    public IRule ribbonRule(IClientConfig config) {
+        return new AvailabilityFilteringRule();
+    }
+}

spring-cloud/spring-cloud-kubernetes-2/client-service/src/main/java/com/baeldung/spring/cloud/kubernetes/client/TravelAgencyService.java

@@ -0,0 +1,26 @@
+package com.baeldung.spring.cloud.kubernetes.client;
+
+import com.netflix.hystrix.contrib.javanica.annotation.HystrixCommand;
+import com.netflix.hystrix.contrib.javanica.annotation.HystrixProperty;
+import org.springframework.stereotype.Service;
+import org.springframework.web.client.RestTemplate;
+
+@Service
+public class TravelAgencyService {
+
+    private final RestTemplate restTemplate;
+
+    public TravelAgencyService(RestTemplate restTemplate) {
+        this.restTemplate = restTemplate;
+    }
+
+    @HystrixCommand(fallbackMethod = "getFallbackName", commandProperties = {
+            @HystrixProperty(name = "execution.isolation.thread.timeoutInMilliseconds", value = "1000") })
+    public String getDeals() {
+        return this.restTemplate.getForObject("http://travel-agency-service:8080/deals", String.class);
+    }
+
+    private String getFallbackName() {
+        return "Fallback";
+    }
+}

spring-cloud/spring-cloud-kubernetes-2/client-service/src/main/resources/application.yaml

@@ -0,0 +1,16 @@
+spring:
+  application.name: client-service
+  cloud.kubernetes.reload.enabled: true
+server.port: 8080
+management:
+  endpoint:
+    restart:
+      enabled: true
+    health:
+      enabled: true
+    info:
+      enabled: true
+ribbon:
+  http:
+    client:
+      enabled: true

spring-cloud/spring-cloud-kubernetes-2/client-service/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>%d{HH:mm:ss.SSS} [%thread] %-5level %logger{36} - %msg%n
+            </pattern>
+        </encoder>
+    </appender>
+
+    <root level="INFO">
+        <appender-ref ref="STDOUT" />
+    </root>
+</configuration>

spring-cloud/spring-cloud-kubernetes-2/client-service/src/test/java/org/baeldung/SpringContextIntegrationTest.java

@@ -0,0 +1,17 @@
+package org.baeldung;
+
+import org.junit.Test;
+import org.junit.runner.RunWith;
+import org.springframework.boot.test.context.SpringBootTest;
+import org.springframework.test.context.junit4.SpringRunner;
+
+import com.baeldung.spring.cloud.kubernetes.client.Application;
+
+@RunWith(SpringRunner.class)
+@SpringBootTest(classes = Application.class)
+public class SpringContextIntegrationTest {
+
+    @Test
+    public void contextLoads() {
+    }
+}

spring-cloud/spring-cloud-kubernetes-2/deployment-all.sh

@@ -0,0 +1,34 @@
+### build the repository
+mvn clean  install
+
+### set docker env
+eval $(minikube docker-env)
+
+### build the docker images on minikube
+cd travel-agency-service
+docker build -t travel-agency-service .
+cd ../client-service
+docker build -t client-service .
+cd ..
+
+### secret and mongodb
+kubectl delete -f secret.yaml
+kubectl delete -f mongo-deployment.yaml
+
+kubectl create -f secret.yaml
+kubectl create -f mongo-deployment.yaml
+
+### travel-agency-service
+kubectl delete -f travel-agency-service/travel-agency-deployment.yaml
+kubectl create -f travel-agency-service/travel-agency-deployment.yaml
+
+
+### client-service
+kubectl delete configmap client-service
+kubectl delete -f client-service/client-service-deployment.yaml
+
+kubectl create -f client-service/client-config.yaml
+kubectl create -f client-service/client-service-deployment.yaml
+
+# Check that the pods are running
+kubectl get pods

spring-cloud/spring-cloud-kubernetes-2/mongo-deployment.yaml

@@ -0,0 +1,45 @@
+apiVersion: v1
+kind: Service
+metadata:
+  labels:
+    app: mongo
+  name: mongodb-service
+spec:
+  type: NodePort
+  ports:
+  - name: "http"
+    port: 27017
+    protocol: TCP
+    targetPort: 27017
+  selector:
+    service: mongo
+---
+apiVersion: extensions/v1beta1
+kind: Deployment
+metadata:
+  name: mongo
+spec:
+  replicas: 1
+  template:
+    metadata:
+      labels:
+        service: mongo
+      name: mongodb-service
+    spec:
+      containers:
+      - args:
+        - mongod
+        - --smallfiles
+        image: mongo:latest
+        name: mongo
+        env:
+          - name: MONGO_INITDB_ROOT_USERNAME
+            valueFrom:
+              secretKeyRef:
+                name: db-secret
+                key: username
+          - name: MONGO_INITDB_ROOT_PASSWORD
+            valueFrom:
+              secretKeyRef:
+                name: db-secret
+                key: password