Merge branch 'eugenp:master' into master

algorithms-modules/algorithms-miscellaneous-4/README.md

@@ -11,4 +11,5 @@ This module contains articles about algorithms. Some classes of algorithms, e.g.
 - [Find the Longest Substring without Repeating Characters](https://www.baeldung.com/java-longest-substring-without-repeated-characters)
 - [Permutations of an Array in Java](https://www.baeldung.com/java-array-permutations)
 - [Find the Smallest Missing Integer in an Array](https://www.baeldung.com/java-smallest-missing-integer-in-array)
+- [Permutations of a String in Java](https://www.baeldung.com/java-string-permutations)
 - More articles: [[<-- prev]](/algorithms-miscellaneous-3) [[next -->]](/algorithms-miscellaneous-5)

algorithms-modules/algorithms-miscellaneous-4/src/main/java/com/baeldung/algorithms/stringpermutation/Helper.java

@@ -1,14 +1,20 @@
 package com.baeldung.algorithms.stringpermutation;
 
+import java.util.Collection;
 import java.util.List;
 import java.util.stream.Collectors;
 
-public class ArrayHelper {
+public class Helper {
 
-    private ArrayHelper() {
+    private Helper() {
     }
 
     static List<Character> toCharacterList(final String string) {
         return string.chars().mapToObj(s -> ((char) s)).collect(Collectors.toList());
     }
+
+    static String toString(Collection<Character> collection) {
+        return collection.stream().map(Object::toString).collect(Collectors.joining());
+    }
+
 }

algorithms-modules/algorithms-miscellaneous-4/src/main/java/com/baeldung/algorithms/stringpermutation/StringPermutationsApache.java

@@ -1,20 +1,29 @@
 package com.baeldung.algorithms.stringpermutation;
 
-import java.util.Collection;
+import java.util.ArrayList;
 import java.util.List;
+import java.util.stream.Collectors;
 import org.apache.commons.collections4.CollectionUtils;
 import org.apache.commons.collections4.iterators.PermutationIterator;
 
 public class StringPermutationsApache {
 
-    public Collection<List<Character>> eagerPermutationWithRepetitions(final String string) {
-        final List<Character> characters = ArrayHelper.toCharacterList(string);
-        return CollectionUtils.permutations(characters);
+    public List<String> eagerPermutationWithRepetitions(final String string) {
+        final List<Character> characters = Helper.toCharacterList(string);
+        return CollectionUtils.permutations(characters)
+            .stream()
+            .map(Helper::toString)
+            .collect(Collectors.toList());
     }
 
-    public PermutationIterator<Character> lazyPermutationWithoutRepetitions(final String string) {
-        final List<Character> characters = ArrayHelper.toCharacterList(string);
-        return new PermutationIterator<>(characters);
+    public List<String> lazyPermutationWithoutRepetitions(final String string) {
+        final List<Character> characters = Helper.toCharacterList(string);
+        final PermutationIterator<Character> permutationIterator = new PermutationIterator<>(characters);
+        final List<String> result = new ArrayList<>();
+        while (permutationIterator.hasNext()) {
+            result.add(Helper.toString(permutationIterator.next()));
+        }
+        return result;
     }
 
 }

algorithms-modules/algorithms-miscellaneous-4/src/main/java/com/baeldung/algorithms/stringpermutation/StringPermutationsCombinatoricsLib.java

@@ -7,19 +7,21 @@ import org.paukov.combinatorics3.PermutationGenerator.TreatDuplicatesAs;
 
 public class StringPermutationsCombinatoricsLib {
 
-    public List<List<Character>> permutationWithoutRepetitions(final String string) {
-        List<Character> chars = ArrayHelper.toCharacterList(string);
-        return Generator.permutation(chars)
-            .simple()
-            .stream()
-            .collect(Collectors.toList());
-    }
+public List<String> permutationWithoutRepetitions(final String string) {
+    List<Character> chars = Helper.toCharacterList(string);
+    return Generator.permutation(chars)
+        .simple()
+        .stream()
+        .map(Helper::toString)
+        .collect(Collectors.toList());
+}
 
-    public List<List<Character>> permutationWithRepetitions(final String string) {
-        List<Character> chars = ArrayHelper.toCharacterList(string);
+    public List<String> permutationWithRepetitions(final String string) {
+        List<Character> chars = Helper.toCharacterList(string);
         return Generator.permutation(chars)
             .simple(TreatDuplicatesAs.IDENTICAL)
             .stream()
+            .map(Helper::toString)
             .collect(Collectors.toList());
     }
 

algorithms-modules/algorithms-miscellaneous-4/src/main/java/com/baeldung/algorithms/stringpermutation/StringPermutationsGuava.java

@@ -1,18 +1,22 @@
 package com.baeldung.algorithms.stringpermutation;
 
 import com.google.common.collect.Collections2;
-import java.util.Collection;
 import java.util.List;
+import java.util.stream.Collectors;
 
 public class StringPermutationsGuava {
 
-    public Collection<List<Character>> permutationWithRepetitions(final String string) {
-        final List<Character> characters = ArrayHelper.toCharacterList(string);
-        return Collections2.permutations(characters);
+    public List<String> permutationWithRepetitions(final String string) {
+        final List<Character> characters = Helper.toCharacterList(string);
+        return Collections2.permutations(characters).stream()
+            .map(Helper::toString)
+            .collect(Collectors.toList());
+    }
+    public List<String> permutationWithoutRepetitions(final String string) {
+        final List<Character> characters = Helper.toCharacterList(string);
+        return Collections2.orderedPermutations(characters).stream()
+            .map(Helper::toString)
+            .collect(Collectors.toList());
     }
-public Collection<List<Character>> permutationWithoutRepetitions(final String string) {
-    final List<Character> characters = ArrayHelper.toCharacterList(string);
-    return Collections2.orderedPermutations(characters);
-}
 
 }

algorithms-modules/algorithms-miscellaneous-4/src/test/java/com/baeldung/algorithms/stringpermutation/HelperUnitTest.java

@@ -0,0 +1,36 @@
+package com.baeldung.algorithms.stringpermutation;
+
+import static org.assertj.core.api.AssertionsForClassTypes.assertThat;
+
+import java.util.Arrays;
+import java.util.List;
+import java.util.stream.Stream;
+import org.junit.jupiter.params.ParameterizedTest;
+import org.junit.jupiter.params.provider.Arguments;
+import org.junit.jupiter.params.provider.MethodSource;
+
+class HelperUnitTest {
+
+    @ParameterizedTest
+    @MethodSource("stringProvider")
+    void toListTest(String value, List<Character> expected) {
+        final List<Character> actual = Helper.toCharacterList(value);
+        assertThat(expected).isEqualTo(actual);
+    }
+
+    @ParameterizedTest
+    @MethodSource("stringProvider")
+    void toStringTest(String expected, List<Character> value) {
+        final String actual = Helper.toString(value);
+        assertThat(expected).isEqualTo(actual);
+    }
+
+    static Stream<Arguments> stringProvider() {
+        return Stream.of(
+            Arguments.of("hello", Arrays.asList('h', 'e', 'l', 'l', 'o')),
+            Arguments.of("abc", Arrays.asList('a','b','c')),
+            Arguments.of("12345", Arrays.asList('1', '2', '3', '4', '5'))
+        );
+    }
+
+}

algorithms-modules/algorithms-miscellaneous-4/src/test/java/com/baeldung/algorithms/stringpermutation/StringPermutationsApacheUnitTest.java

@@ -2,22 +2,19 @@ package com.baeldung.algorithms.stringpermutation;
 
 import static org.assertj.core.api.Assertions.assertThat;
 
-import java.util.Collection;
 import java.util.List;
-import org.apache.commons.collections4.iterators.PermutationIterator;
-import org.junit.jupiter.api.DisplayName;
 import org.junit.jupiter.params.ParameterizedTest;
 import org.junit.jupiter.params.provider.CsvSource;
 
 class StringPermutationsApacheUnitTest {
 
+    @ParameterizedTest
     @CsvSource({"abc, 6",
                 "hello, 120",
                 "aaaaaa, 720"})
-    @DisplayName("Apache permutation for ")
     void testPermutationsWithRepetitions(String string, int numberOfPermutations) {
         StringPermutationsApache permutationGenerator = new StringPermutationsApache();
-        final Collection<List<Character>> permutations = permutationGenerator.eagerPermutationWithRepetitions(string);
+        final List<String> permutations = permutationGenerator.eagerPermutationWithRepetitions(string);
         final int size = permutations.size();
         assertThat(permutations)
             .as("\"%s\" should have %d permutation, but had %d", string, numberOfPermutations, size)
@@ -30,12 +27,8 @@ class StringPermutationsApacheUnitTest {
         "aaaaaa, 720"})
     void testPermutationsWithoutRepetitions(String string, int numberOfPermutations) {
         StringPermutationsApache permutationGenerator = new StringPermutationsApache();
-        final PermutationIterator<Character> permutations = permutationGenerator.lazyPermutationWithoutRepetitions(string);
-        int size = 0;
-        while (permutations.hasNext()) {
-            permutations.next();
-            ++size;
-        }
+        final List<String> permutations = permutationGenerator.lazyPermutationWithoutRepetitions(string);
+        int size = permutations.size();
         assertThat(size)
             .as("\"%s\" should have %d permutation, but had %d", string, numberOfPermutations, size)
             .isEqualTo(numberOfPermutations);

algorithms-modules/algorithms-miscellaneous-4/src/test/java/com/baeldung/algorithms/stringpermutation/StringPermutationsCombinatoricsLibUnitTest.java

@@ -14,7 +14,7 @@ class StringPermutationsCombinatoricsLibUnitTest {
                 "aaaaaa, 720"})
     void testPermutationsWithRepetitions(String string, int numberOfPermutations) {
         StringPermutationsCombinatoricsLib permutationGenerator = new StringPermutationsCombinatoricsLib();
-        final List<List<Character>> permutations = permutationGenerator.permutationWithRepetitions(string);
+        final List<String> permutations = permutationGenerator.permutationWithRepetitions(string);
         final int size = permutations.size();
         assertThat(permutations)
             .as("\"%s\" should have %d permutation, but had %d", string, numberOfPermutations, size)
@@ -27,7 +27,7 @@ class StringPermutationsCombinatoricsLibUnitTest {
                 "aaaaaa, 1"})
     void testPermutationsWithoutRepetitions(String string, int numberOfPermutations) {
         StringPermutationsCombinatoricsLib permutationGenerator = new StringPermutationsCombinatoricsLib();
-        final List<List<Character>> permutations = permutationGenerator.permutationWithoutRepetitions(string);
+        final List<String> permutations = permutationGenerator.permutationWithoutRepetitions(string);
         final int size = permutations.size();
         assertThat(permutations)
             .as("\"%s\" should have %d permutation, but had %d", string, numberOfPermutations, size)

algorithms-modules/algorithms-miscellaneous-4/src/test/java/com/baeldung/algorithms/stringpermutation/StringPermutationsGuavaUnitTest.java

@@ -2,7 +2,6 @@ package com.baeldung.algorithms.stringpermutation;
 
 import static org.assertj.core.api.Assertions.assertThat;
 
-import java.util.Collection;
 import java.util.List;
 import org.junit.jupiter.params.ParameterizedTest;
 import org.junit.jupiter.params.provider.CsvSource;
@@ -15,7 +14,7 @@ class StringPermutationsGuavaUnitTest {
         "aaaaaa, 720"})
     void testPermutationsWithRepetitions(String string, int numberOfPermutations) {
         StringPermutationsGuava permutationGenerator = new StringPermutationsGuava();
-        final Collection<List<Character>> permutations = permutationGenerator.permutationWithRepetitions(string);
+        final List<String> permutations = permutationGenerator.permutationWithRepetitions(string);
         final int size = permutations.size();
         assertThat(permutations)
             .as("\"%s\" should have %d permutation, but had %d", string, numberOfPermutations, size)
@@ -28,7 +27,7 @@ class StringPermutationsGuavaUnitTest {
         "aaaaaa, 1"})
     void testPermutationsWithoutRepetitions(String string, int numberOfPermutations) {
         StringPermutationsGuava permutationGenerator = new StringPermutationsGuava();
-        final Collection<List<Character>> permutations = permutationGenerator.permutationWithoutRepetitions(string);
+        final List<String> permutations = permutationGenerator.permutationWithoutRepetitions(string);
         final int size = permutations.size();
         assertThat(permutations)
             .as("\"%s\" should have %d permutation, but had %d", string, numberOfPermutations, size)

algorithms-modules/algorithms-miscellaneous-7/README.md

@@ -0,0 +1,4 @@
+### Relevant Articles:
+
+- [Algorithm to Identify and Validate a Credit Card Number](https://www.baeldung.com/java-validate-cc-number)
+- More articles: [[<-- prev]](/algorithms-miscellaneous-6)

algorithms-modules/algorithms-miscellaneous-7/pom.xml

@@ -0,0 +1,16 @@
+<?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>algorithms-miscellaneous-7</artifactId>
+    <version>0.0.1-SNAPSHOT</version>
+    <name>algorithms-miscellaneous-7</name>
+
+    <parent>
+        <groupId>com.baeldung</groupId>
+        <artifactId>algorithms-modules</artifactId>
+        <version>1.0.0-SNAPSHOT</version>
+    </parent>
+
+</project>

algorithms-modules/algorithms-miscellaneous-7/src/main/java/com/baeldung/algorithms/luhn/LuhnChecker.java

@@ -0,0 +1,73 @@
+package com.baeldung.algorithms.luhn;
+
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+public class LuhnChecker {
+
+    private static final Logger LOGGER = LoggerFactory.getLogger(LuhnChecker.class);
+    
+    /*
+     * Starting from the rightmost digit, we add all the digits together, performing
+     * a special step for every second digit.
+     * 
+     * If the result is not divisible by 10, then the card number must not be valid.
+     * 
+     * We can form a number that passes the Luhn Check by subtracting the result of
+     * the Luhn algorithm from 10.
+     * 
+     * This is how the final digit of a credit card is calculated.
+     */
+    public static boolean checkLuhn(String cardNumber) {
+        int sum = 0;
+
+        try {
+            for (int i = cardNumber.length() - 1; i >= 0; i--) {
+                int digit = Integer.parseInt(cardNumber.substring(i, i + 1));
+
+                if ((cardNumber.length() - i) % 2 == 0) {
+                    digit = doubleAndSumDigits(digit);
+                }
+
+                sum += digit;
+            }
+            
+            LOGGER.info("Luhn Algorithm sum of digits is " + sum);
+            
+        } catch (NumberFormatException e) {
+            LOGGER.error("NumberFormatException - Card number probably contained some non-numeric characters, returning false");
+            return false;
+        } catch (NullPointerException e) {
+            LOGGER.error("Null pointer - Card number was probably null, returning false");
+            return false;
+        }
+        
+        boolean result = sum % 10 == 0;
+        
+        LOGGER.info("Luhn check result (sum divisible by 10): " + result);
+        
+        return result;
+    }
+
+    /*
+     * We apply this method to every second number from the right of the card
+     * number. First, we double the digit, then we sum the digits.
+     * 
+     * Note: subtracting 9 is equivalent to doubling and summing digits (when
+     * starting with a single digit) 0-4 -> produce single digit when doubled
+     * 5*2 = 10 -> 1+0 = 1 = 10-9 
+     * 6*2 = 12 -> 1+3 = 3 = 12-9 
+     * 7*2 = 14 -> 1+5 = 5 = 14-9
+     * 8*2 = 16 -> 1+7 = 7 = 16-9 
+     * 9*2 = 18 -> 1+9 = 9 = 18-9
+     */
+    public static int doubleAndSumDigits(int digit) {
+        int ret = digit * 2;
+
+        if (ret > 9) {
+            ret -= 9;
+        }
+
+        return ret;
+    }
+}

algorithms-modules/algorithms-miscellaneous-7/src/test/java/com/baeldung/algorithms/luhn/LuhnCheckerUnitTest.java

@@ -0,0 +1,63 @@
+package com.baeldung.algorithms.luhn;
+
+import org.junit.Assert;
+import org.junit.Test;
+
+public class LuhnCheckerUnitTest {
+
+    @Test
+    public void whenCardNumberDoesMeetLuhnCriteria_thenCheckLuhnReturnsTrue() {
+        String cardNumber = "8649";
+        boolean result = LuhnChecker.checkLuhn(cardNumber);
+        Assert.assertTrue(result);
+    }
+    
+    @Test
+    public void whenCardNumberDoesNotMeetLuhnCriteria_thenCheckLuhnReturnsFalse() {
+        String cardNumber = "8642";
+        boolean result = LuhnChecker.checkLuhn(cardNumber);
+        Assert.assertFalse(result);
+    }
+    
+    @Test
+    public void whenCardNumberHasNoSecondDigits_thenCheckLuhnCalculatesCorrectly() {
+        String cardNumber = "0505050505050505";
+        boolean result = LuhnChecker.checkLuhn(cardNumber);
+        Assert.assertTrue(result);
+    }
+
+    @Test
+    public void whenCardNumberHasSecondDigits_thenCheckLuhnCalculatesCorrectly() {
+        String cardNumber = "75757575757575";
+        boolean result = LuhnChecker.checkLuhn(cardNumber);
+        Assert.assertTrue(result);
+    }
+    
+    @Test
+    public void whenDoubleAndSumDigitsIsCalled_thenOutputIsCorrect() {
+        Assert.assertEquals(LuhnChecker.doubleAndSumDigits(0), 0);
+        Assert.assertEquals(LuhnChecker.doubleAndSumDigits(1), 2);
+        Assert.assertEquals(LuhnChecker.doubleAndSumDigits(2), 4);
+        Assert.assertEquals(LuhnChecker.doubleAndSumDigits(3), 6);
+        Assert.assertEquals(LuhnChecker.doubleAndSumDigits(4), 8);
+        Assert.assertEquals(LuhnChecker.doubleAndSumDigits(5), 1);
+        Assert.assertEquals(LuhnChecker.doubleAndSumDigits(6), 3);
+        Assert.assertEquals(LuhnChecker.doubleAndSumDigits(7), 5);
+        Assert.assertEquals(LuhnChecker.doubleAndSumDigits(8), 7);
+        Assert.assertEquals(LuhnChecker.doubleAndSumDigits(9), 9);
+    }
+    
+    @Test
+    public void whenCardNumberNonNumeric_thenCheckLuhnReturnsFalse() {
+        String cardNumber = "test";
+        boolean result = LuhnChecker.checkLuhn(cardNumber);
+        Assert.assertFalse(result);
+    }
+    
+    @Test
+    public void whenCardNumberIsNull_thenCheckLuhnReturnsFalse() {
+        String cardNumber = null;
+        boolean result = LuhnChecker.checkLuhn(cardNumber);
+        Assert.assertFalse(result);
+    }
+}

algorithms-modules/pom.xml

@@ -21,6 +21,7 @@
         <module>algorithms-miscellaneous-4</module>
         <module>algorithms-miscellaneous-5</module>
         <module>algorithms-miscellaneous-6</module>
+        <module>algorithms-miscellaneous-7</module>
         <module>algorithms-searching</module>
         <module>algorithms-sorting</module>
         <module>algorithms-sorting-2</module>

apache-cxf-modules/pom.xml

@@ -5,7 +5,7 @@
     <modelVersion>4.0.0</modelVersion>
     <artifactId>apache-cxf-modules</artifactId>
     <version>0.0.1-SNAPSHOT</version>
-    <name>apache-cxf</name>
+    <name>apache-cxf-modules</name>
     <packaging>pom</packaging>
 
     <parent>

apache-kafka-2/README.md

@@ -0,0 +1,9 @@
+## Apache Kafka
+
+This module contains articles about Apache Kafka.
+
+##### Building the project
+You can build the project from the command line using: *mvn clean install*, or in an IDE.
+
+### Relevant Articles:
+- [Guide to Check if Apache Kafka Server Is Running](https://www.baeldung.com/apache-kafka-check-server-is-running)

apache-kafka-2/log4j.properties

@@ -0,0 +1 @@
+log4j.rootLogger=INFO, stdout

apache-kafka-2/pom.xml

@@ -0,0 +1,68 @@
+<?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>apache-kafka-2</artifactId>
+    <name>apache-kafka-2</name>
+
+    <parent>
+        <groupId>com.baeldung</groupId>
+        <artifactId>parent-modules</artifactId>
+        <version>1.0.0-SNAPSHOT</version>
+    </parent>
+
+    <dependencies>
+        <dependency>
+            <groupId>org.apache.kafka</groupId>
+            <artifactId>kafka-clients</artifactId>
+            <version>${kafka.version}</version>
+        </dependency>
+        <dependency>
+            <groupId>org.slf4j</groupId>
+            <artifactId>slf4j-api</artifactId>
+            <version>${org.slf4j.version}</version>
+        </dependency>
+        <dependency>
+            <groupId>org.slf4j</groupId>
+            <artifactId>slf4j-log4j12</artifactId>
+            <version>${org.slf4j.version}</version>
+        </dependency>
+        <dependency>
+            <groupId>com.google.guava</groupId>
+            <artifactId>guava</artifactId>
+            <version>${guava.version}</version>
+        </dependency>
+        <dependency>
+            <groupId>org.testcontainers</groupId>
+            <artifactId>kafka</artifactId>
+            <version>${testcontainers-kafka.version}</version>
+            <scope>test</scope>
+        </dependency>
+        <dependency>
+            <groupId>org.testcontainers</groupId>
+            <artifactId>junit-jupiter</artifactId>
+            <version>${testcontainers-jupiter.version}</version>
+            <scope>test</scope>
+        </dependency>
+        <dependency>
+            <groupId>net.java.dev.jna</groupId>
+            <artifactId>jna</artifactId>
+            <version>5.7.0</version>
+            <scope>test</scope>
+        </dependency>
+        <dependency>
+            <groupId>org.projectlombok</groupId>
+            <artifactId>lombok</artifactId>
+            <version>${lombok.version}</version>
+            <scope>provided</scope>
+        </dependency>
+    </dependencies>
+
+    <properties>
+        <kafka.version>2.8.0</kafka.version>
+        <testcontainers-kafka.version>1.15.3</testcontainers-kafka.version>
+        <testcontainers-jupiter.version>1.15.3</testcontainers-jupiter.version>
+    </properties>
+
+</project>

apache-kafka-2/src/main/java/com/baeldung/kafka/KafkaAdminClient.java

@@ -0,0 +1,35 @@
+package com.baeldung.kafka;
+
+import java.util.Collection;
+import java.util.Properties;
+import java.util.concurrent.ExecutionException;
+
+import org.apache.kafka.clients.admin.AdminClient;
+import org.apache.kafka.common.Node;
+
+public class KafkaAdminClient {
+    private final AdminClient client;
+
+    public KafkaAdminClient(String bootstrap) {
+        Properties props = new Properties();
+        props.put("bootstrap.servers", bootstrap);
+        props.put("request.timeout.ms", 3000);
+        props.put("connections.max.idle.ms", 5000);
+
+        this.client = AdminClient.create(props);
+    }
+
+    public boolean verifyConnection() throws ExecutionException, InterruptedException {
+        Collection<Node> nodes = this.client.describeCluster()
+            .nodes()
+            .get();
+        return nodes != null && nodes.size() > 0;
+    }
+
+    public static void main(String[] args) throws ExecutionException, InterruptedException {
+        String defaultBootStrapServer = "localhost:9092";
+        KafkaAdminClient kafkaAdminClient = new KafkaAdminClient(defaultBootStrapServer);
+        System.out.println(kafkaAdminClient.verifyConnection());
+    }
+
+}

apache-kafka-2/src/test/java/com/baeldung/kafka/KafkaConnectionLiveTest.java

@@ -0,0 +1,39 @@
+package com.baeldung.kafka;
+
+import org.junit.jupiter.api.AfterEach;
+import org.junit.jupiter.api.BeforeEach;
+import org.junit.jupiter.api.Test;
+import org.testcontainers.containers.KafkaContainer;
+import org.testcontainers.junit.jupiter.Container;
+import org.testcontainers.junit.jupiter.Testcontainers;
+import org.testcontainers.utility.DockerImageName;
+
+import static org.assertj.core.api.Assertions.assertThat;
+
+// This live test needs a running Docker instance so that a kafka container can be created
+
+@Testcontainers
+class KafkaConnectionLiveTest {
+
+    @Container
+    private static final KafkaContainer KAFKA_CONTAINER = new KafkaContainer(DockerImageName.parse("confluentinc/cp-kafka:5.4.3"));
+    private KafkaAdminClient kafkaAdminClient;
+
+    @BeforeEach
+    void setup() {
+        KAFKA_CONTAINER.addExposedPort(9092);
+        this.kafkaAdminClient = new KafkaAdminClient(KAFKA_CONTAINER.getBootstrapServers());
+    }
+
+    @AfterEach
+    void destroy() {
+        KAFKA_CONTAINER.stop();
+    }
+
+    @Test
+    void givenKafkaIsRunning_whenCheckedForConnection_thenConnectionIsVerified() throws Exception {
+        boolean alive = kafkaAdminClient.verifyConnection();
+        assertThat(alive).isTrue();
+    }
+
+}

apache-kafka/pom.xml

@@ -173,7 +173,6 @@
         <graphframes.version>0.8.1-spark3.0-s_2.12</graphframes.version>
         <com.datastax.spark.spark-cassandra-connector.version>2.5.2</com.datastax.spark.spark-cassandra-connector.version>
         <com.datastax.spark.spark-cassandra-connector-java.version>1.6.0-M1</com.datastax.spark.spark-cassandra-connector-java.version>
-        <lombok.version>1.18.20</lombok.version>
     </properties>
 
 </project>

apache-olingo/src/main/resources/application.yml

@@ -1,16 +1,19 @@
 server:
   port: 8080
-  
+
 spring:
   jersey:
     application-path: /odata
-    
+
   jpa:
     defer-datasource-initialization: true
     show-sql: true
     open-in-view: false
     hibernate:
       ddl-auto: update
+    properties:
+      hibernate:
+        globally_quoted_identifiers: true
 
   sql:
     init:

apache-olingo/src/main/resources/data.sql

@@ -1,12 +1,10 @@
-insert into car_maker(id,name) values (1,'Special Motors');
-insert into car_maker(id,name) values (2,'BWM');
-insert into car_maker(id,name) values (3,'Dolores');
+insert into "car_maker"("id", "name") values (1,'Special Motors');
+insert into "car_maker"("id", "name") values (2,'BWM');
+insert into "car_maker"("id", "name") values (3,'Dolores');
 
-insert into car_model(id,maker_fk,name,sku,year) values(1,1,'Muze','SM001',2018);
-insert into car_model(id,maker_fk,name,sku,year) values(2,1,'Empada','SM002',2008);
+insert into "car_model"("id", "maker_fk", "name", "sku", "year") values(1,1,'Muze','SM001',2018);
+insert into "car_model"("id", "maker_fk", "name", "sku", "year") values(2,1,'Empada','SM002',2008);
 
-insert into car_model(id,maker_fk,name,sku,year) values(4,2,'BWM-100','BWM100',2008);
-insert into car_model(id,maker_fk,name,sku,year) values(5,2,'BWM-200','BWM200',2009);
-insert into car_model(id,maker_fk,name,sku,year) values(6,2,'BWM-300','BWM300',2008);
-
-alter sequence hibernate_sequence restart with 100;
+insert into "car_model"("id", "maker_fk", "name", "sku", "year") values(4,2,'BWM-100','BWM100',2008);
+insert into "car_model"("id", "maker_fk", "name", "sku", "year") values(5,2,'BWM-200','BWM200',2009);
+insert into "car_model"("id", "maker_fk", "name", "sku", "year") values(6,2,'BWM-300','BWM300',2008);

core-java-modules/core-java-collections-list-4/README.md

@@ -8,4 +8,5 @@ This module contains articles about the Java List collection
 - [Sort a List Alphabetically in Java](https://www.baeldung.com/java-sort-list-alphabetically)
 - [Arrays.asList() vs Collections.singletonList()](https://www.baeldung.com/java-aslist-vs-singletonlist)
 - [Replace Element at a Specific Index in a Java ArrayList](https://www.baeldung.com/java-arraylist-replace-at-index)
+- [Difference Between Arrays.asList() and List.of()](https://www.baeldung.com/java-arrays-aslist-vs-list-of)
 - [[<-- Prev]](/core-java-modules/core-java-collections-list-3)

core-java-modules/core-java-collections-list-4/pom.xml

@@ -64,6 +64,23 @@
         <colt.version>1.2.0</colt.version>
         <apache-commons.version>3.0</apache-commons.version>
         <assertj.version>3.22.0</assertj.version>
+        <maven.compiler.source.version>17</maven.compiler.source.version>
+        <maven.compiler.target.version>17</maven.compiler.target.version>
+       
     </properties>
+    
+    <build>
+        <plugins>
+            <plugin>
+                <groupId>org.apache.maven.plugins</groupId>
+                <artifactId>maven-compiler-plugin</artifactId>
+                <version>${maven-compiler-plugin.version}</version>
+                <configuration>
+                    <source>${maven.compiler.source.version}</source>
+                    <target>${maven.compiler.target.version}</target>
+                </configuration>
+            </plugin>
+        </plugins>
+    </build>
 
-</project>
+</project>

core-java-modules/core-java-collections-list-4/src/test/java/com/baeldung/list/creation/ArraysAsListUnitTest.java

@@ -0,0 +1,56 @@
+package com.baeldung.list.creation;
+
+import org.junit.jupiter.api.Test;
+
+import java.util.Arrays;
+import java.util.List;
+
+import static org.assertj.core.api.Assertions.assertThat;
+import static org.junit.jupiter.api.Assertions.assertThrows;
+
+class ArraysAsListUnitTest {
+
+    @Test
+    void givenAnArrayOfIntegersWhenCreatingAListUsingArraysAsListThenItWillHaveTheSameElementsInTheSameOrder() {
+        Integer[] array = new Integer[]{1, 2, 3, 4};
+        List<Integer> list = Arrays.asList(array);
+        assertThat(list).containsExactly(1, 2, 3, 4);
+    }
+
+    @Test
+    void givenAnListOfIntegersCreatedUsingArraysAsListWhenChangingTheOriginalArrayTheReturnListWillAlsoChange() {
+        Integer[] array = new Integer[]{1, 2, 3};
+        List<Integer> list = Arrays.asList(array);
+        array[0] = 1000;
+        assertThat(list.get(0)).isEqualTo(1000);
+    }
+
+    @Test
+    void givenAnListOfIntegersCreatedUsingArraysAsListWhenChangingTheReturnedListTheOriginalArrayWillAlsoChange() {
+        Integer[] array = new Integer[]{1, 2, 3};
+        List<Integer> list = Arrays.asList(array);
+        list.set(0, 1000);
+        assertThat(array[0]).isEqualTo(1000);
+    }
+
+    @Test
+    void givenAnArrayOfIntegersCreatedUsingArraysAsListWhenModifyingAnExistingElementThenModifyIt() {
+        List<Integer> list = Arrays.asList(1, 2, 3, 4);
+        list.set(1, 1000);
+        assertThat(list.get(1)).isEqualTo(1000);
+    }
+
+    @Test
+    void givenAnArrayCreatedWithArraysAsListWhenAddingANewElementThenUnsupportedOperationExceptionIsThrown() {
+        List<Integer> list = Arrays.asList(1, 2, 3, 4, 5);
+        assertThrows(UnsupportedOperationException.class, () -> list.add(6));
+    }
+
+    @Test
+    void givenAnArrayCreatedWithArraysAsListWhenRemovingAnExistingElementThenUnsupportedOperationExceptionIsThrown() {
+        List<Integer> list = Arrays.asList(1, 2, 3, 4, 5);
+        assertThrows(UnsupportedOperationException.class, () -> list.remove(1));
+    }
+
+
+}

core-java-modules/core-java-collections-list-4/src/test/java/com/baeldung/list/creation/ListOfUnitTest.java

@@ -0,0 +1,51 @@
+package com.baeldung.list.creation;
+
+import org.junit.jupiter.api.Test;
+
+import java.util.List;
+
+import static org.assertj.core.api.Assertions.assertThat;
+import static org.junit.jupiter.api.Assertions.assertThrows;
+
+class ListOfUnitTest {
+
+    @Test
+    void givenAnArrayOfStringWhenCreatingAListUsingItsValuesThenItWillHaveTheSameElementsInTheSameOrder() {
+        String[] array = new String[]{"one", "two", "three"};
+        List<String> list = List.of(array);
+        assertThat(list).containsExactly("one", "two", "three");
+    }
+
+    @Test
+    void givenAnListOfStringCreatedUsingListOfWhenChangingTheOriginalArrayTheReturnListWontChange() {
+        String[] array = new String[]{"one", "two", "three"};
+        List<String> list = List.of(array);
+        array[0] = "thousand";
+        assertThat(list.get(0)).isEqualTo("one");
+    }
+
+    @Test
+    void givenAnArrayCreatedWithListOfWhenAddingANewElementThenUnsupportedOperationExceptionIsThrown() {
+        List<String> list = List.of("one", "two", "three");
+        assertThrows(UnsupportedOperationException.class, () -> list.add("four"));
+    }
+
+    @Test
+    void givenAnArrayCreatedWithListOfWhenRemovingAnExistingElementThenUnsupportedOperationExceptionIsThrown() {
+        List<String> list = List.of("one", "two", "three");
+        assertThrows(UnsupportedOperationException.class, () -> list.remove("two"));
+    }
+
+    @Test
+    void givenAnArrayCreatedWithListOfWhenModifyingAnExistingElementThenUnsupportedOperationExceptionIsThrown() {
+        List<String> list = List.of("one", "two", "three");
+        assertThrows(UnsupportedOperationException.class, () -> list.set(1, "four"));
+    }
+
+    @Test
+    void givenAnArrayContainingNullElementWhenUsingItToCreateListThenNullPointerExceptionIsThrown() {
+        assertThrows(NullPointerException.class, () -> List.of("one", null, "two"));
+    }
+
+
+}

core-java-modules/core-java-concurrency-advanced-2/src/test/java/com/baeldung/concurrent/countdownlatch/CountdownLatchResetExampleManualTest.java

@@ -4,7 +4,7 @@ import static org.junit.Assert.assertTrue;
 
 import org.junit.Test;
 
-public class CountdownLatchResetExampleUnitTest {
+public class CountdownLatchResetExampleManualTest {
     
     @Test
     public void whenCountDownLatch_noReset() {

core-java-modules/core-java-concurrency-advanced-4/README.md

@@ -8,3 +8,4 @@
 - [Acquire a Lock by a Key in Java](https://www.baeldung.com/java-acquire-lock-by-key)
 - [Differences Between set() and lazySet() in Java Atomic Variables](https://www.baeldung.com/java-atomic-set-vs-lazyset)
 - [Volatile vs. Atomic Variables in Java](https://www.baeldung.com/java-volatile-vs-atomic)
+- [What Is “Locked Ownable Synchronizers” in Thread Dump?](https://www.baeldung.com/locked-ownable-synchronizers)

core-java-modules/core-java-concurrency-advanced-4/src/main/java/com/baeldung/ownablesynchronizers/Application.java

@@ -0,0 +1,45 @@
+package com.baeldung.ownablesynchronizers;
+
+import java.util.concurrent.locks.ReentrantLock;
+
+public class Application {
+
+    public static Thread createThread(ReentrantLock mainLock, ReentrantLock otherLock, String threadName) {
+        return new Thread(() -> {
+            try {
+                mainLock.lock();
+
+                // synchronized block here allows us to wait for other thread to lock,
+                // in order to simulate a deadlock
+                synchronized (Application.class) {
+                    Application.class.notify();
+                    if (!otherLock.isLocked()) {
+                        Application.class.wait();
+                    }
+                }
+
+                // thread will hang here
+                otherLock.lock();
+
+                System.out.println(threadName + ": Finished");
+                mainLock.unlock();
+                otherLock.unlock();
+            } catch (InterruptedException e) {
+                System.out.println(threadName + ": " + e.getMessage());
+            }
+        });
+    }
+
+    public static void main(String[] args) throws Exception {
+        ReentrantLock firstLock = new ReentrantLock(true);
+        ReentrantLock secondLock = new ReentrantLock(true);
+        Thread first = createThread(firstLock, secondLock, "Thread-0");
+        Thread second = createThread(secondLock, firstLock, "Thread-1");
+
+        first.start();
+        second.start();
+
+        first.join();
+        second.join();
+    }
+}

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

@@ -2,9 +2,9 @@
     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-concurrency-simple</artifactId>
+    <artifactId>core-java-concurrency-simple</artifactId>
     <version>0.1.0-SNAPSHOT</version>
-    <name>java-concurrency-simple</name>
+    <name>core-java-concurrency-simple</name>
     <packaging>jar</packaging>
 
     <parent>
@@ -14,7 +14,7 @@
     </parent>
 
     <build>
-        <finalName>java-concurrency-simple</finalName>
+        <finalName>core-java-concurrency-simple</finalName>
         <resources>
             <resource>
                 <directory>src/main/resources</directory>

core-java-modules/core-java-jar/src/test/java/com/baeldung/jar/JarAppUnitTest.java

@@ -7,6 +7,6 @@ public class JarAppUnitTest {
 
     @Test
     public void findClassTest(){
-        Assert.assertTrue(JarApp.findObjectMapperClass().endsWith("jackson-databind-2.13.0.jar"));
+        Assert.assertTrue(JarApp.findObjectMapperClass().endsWith("jackson-databind-2.13.3.jar"));
     }
 }

core-java-modules/core-java-lang-5/README.md

@@ -6,3 +6,4 @@ This module contains articles about core features in the Java language
 
 - [Difference Between == and equals() in Java](https://www.baeldung.com/java-equals-method-operator-difference)
 - [Advantages and Disadvantages of Using Java Wildcard Imports](https://www.baeldung.com/java-wildcard-imports)
+- [Toggle a Boolean Variable in Java](https://www.baeldung.com/java-toggle-boolean)

core-java-modules/core-java-lang-5/src/main/java/com/baeldung/toggleboolean/ToggleBoolean.java

@@ -0,0 +1,10 @@
+package com.baeldung.toggleboolean;
+
+public class ToggleBoolean {
+    public static Boolean toggle(Boolean b) {
+        if (b == null) {
+            return b;
+        }
+        return !b;
+    }
+}

core-java-modules/core-java-lang-5/src/test/java/com/baeldung/toggleboolean/ToggleBooleanUnitTest.java

@@ -0,0 +1,60 @@
+package com.baeldung.toggleboolean;
+
+import static org.assertj.core.api.AssertionsForClassTypes.assertThatThrownBy;
+import static org.junit.jupiter.api.Assertions.assertFalse;
+import static org.junit.jupiter.api.Assertions.assertNull;
+import static org.junit.jupiter.api.Assertions.assertTrue;
+
+import org.junit.jupiter.api.Test;
+
+class ToggleBooleanUnitTest {
+    @Test
+    void givenPrimitiveBoolean_whenUsingNotOperator_shouldToggleTheBoolean() {
+        boolean b = true;
+        b = !b;
+        assertFalse(b);
+
+        b = !b;
+        assertTrue(b);
+    }
+
+    @Test
+    void givenNullBoxedBoolean_whenUsingNotOperator_shouldThrowNPE() {
+        assertThatThrownBy(() -> {
+            Boolean b = null;
+            b = !b;
+        }).isInstanceOf(NullPointerException.class);
+    }
+
+    @Test
+    void givenPrimitiveBoolean_whenUsingXorOperator_shouldToggleTheBoolean() {
+        boolean b = true;
+        b ^= true;
+        assertFalse(b);
+
+        b ^= true;
+        assertTrue(b);
+    }
+
+    @Test
+    void givenBooleanObj_whenToggle_shouldGetExpectedResult() {
+        //boxed Boolean
+        Boolean b = true;
+        b = ToggleBoolean.toggle(b);
+        assertFalse(b);
+
+        b = ToggleBoolean.toggle(b);
+        assertTrue(b);
+
+        b = null;
+        b = ToggleBoolean.toggle(b);
+        assertNull(b);
+
+        //primitive boolean
+        boolean bb = true;
+        bb = ToggleBoolean.toggle(bb);
+        assertFalse(bb);
+        bb = ToggleBoolean.toggle(bb);
+        assertTrue(bb);
+    }
+}

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

@@ -33,7 +33,6 @@
     </dependencies>
 
     <properties>
-        <lombok.version>1.18.22</lombok.version>
         <commons-lang.version>2.6</commons-lang.version>
         <assertj-core.version>3.10.0</assertj-core.version>
         <equalsverifier.version>3.0.3</equalsverifier.version>

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

@@ -90,7 +90,6 @@
         <jgonian.commons-ip-math.version>1.32</jgonian.commons-ip-math.version>
         <googlecode.ipv6.version>0.17</googlecode.ipv6.version>
         <javax.mail.version>1.6.2</javax.mail.version>
-        <guava.version>31.0-jre</guava.version>
     </properties>
 
 </project>

core-java-modules/core-java-numbers-5/README.md

@@ -1,3 +1,5 @@
 ### Relevant Articles:
 - [Check if a Number Is Odd or Even](https://www.baeldung.com/java-check-number-parity)
 - [How to Check Whether an Integer Exists in a Range with Java](https://www.baeldung.com/java-interval-contains-integer)
+- [Check if a Number Is Positive or Negative in Java](https://www.baeldung.com/java-check-number-positive-negative)
+- [Armstrong Numbers in Java](https://www.baeldung.com/java-armstrong-numbers)

core-java-modules/core-java-numbers-5/src/main/java/com/baeldung/armstrong/ArmstrongNumberUtil.java

@@ -0,0 +1,44 @@
+package com.baeldung.armstrong;
+
+import java.util.ArrayList;
+import java.util.List;
+import java.util.stream.Collectors;
+import java.util.stream.IntStream;
+
+public class ArmstrongNumberUtil {
+
+    public static boolean isArmstrong(int n) {
+        if (n < 0) {
+            return false;
+        }
+        List<Integer> digitsList = digitsInList(n);
+        int len = digitsList.size();
+        int sum = digitsList.stream()
+            .mapToInt(d -> (int) Math.pow(d, len))
+            .sum();
+        // alternatively, we can use the reduce() method:
+        // int sum = digits.stream()
+        //     .reduce(0, (subtotal, digit) -> subtotal + (int) Math.pow(digit, len));
+        return n == sum;
+    }
+
+    private static List<Integer> digitsInList(int n) {
+        List<Integer> list = new ArrayList<>();
+        while (n > 0) {
+            list.add(n % 10);
+            n = n / 10;
+        }
+        return list;
+    }
+
+    public static List<Integer> getA005188Sequence(int limit) {
+        if (limit < 0) {
+            throw new IllegalArgumentException("The limit cannot be a negative number.");
+        }
+        return IntStream.range(0, limit)
+            .boxed()
+            .filter(ArmstrongNumberUtil::isArmstrong)
+            .collect(Collectors.toList());
+
+    }
+}

core-java-modules/core-java-numbers-5/src/main/java/com/baeldung/positivenegative/PositiveOrNegative.java

@@ -0,0 +1,38 @@
+package com.baeldung.positivenegative;
+
+public class PositiveOrNegative {
+    enum Result {
+        POSITIVE, NEGATIVE, ZERO
+    }
+
+    public static Result byOperator(Integer integer) {
+        if (integer > 0) {
+            return Result.POSITIVE;
+        } else if (integer < 0) {
+            return Result.NEGATIVE;
+        }
+        return Result.ZERO;
+    }
+
+    public static Result bySignum(Integer integer) {
+        int result = Integer.signum(integer);
+
+        if (result == 1) {
+            return Result.POSITIVE;
+        } else if (result == -1) {
+            return Result.NEGATIVE;
+        }
+        return Result.ZERO;
+    }
+
+    public static Result bySignum(Float floatNumber) {
+        float result = Math.signum(floatNumber);
+
+        if (result == 1.0f) {
+            return Result.POSITIVE;
+        } else if (result == -1.0f) {
+            return Result.NEGATIVE;
+        }
+        return Result.ZERO;
+    }
+}

core-java-modules/core-java-numbers-5/src/test/java/com/baeldung/armstrong/ArmstrongNumberUtilUnitTest.java

@@ -0,0 +1,40 @@
+package com.baeldung.armstrong;
+
+import static org.junit.jupiter.api.Assertions.assertEquals;
+
+import java.util.List;
+import java.util.Map;
+
+import org.junit.jupiter.api.Test;
+
+import com.google.common.collect.ImmutableList;
+import com.google.common.collect.ImmutableMap;
+
+class ArmstrongNumberUtilUnitTest {
+    // @formatter:off
+private static final Map<Integer, Boolean> ARMSTRONG_MAP = ImmutableMap.of(
+    0, true,
+    1, true,
+    2, true,
+    153, true,
+    370, true,
+    407, true,
+    42, false,
+    777, false,
+    12345, false);
+    // @formatter:on
+
+    private static final List<Integer> A005188_SEQ_1K = ImmutableList.of(0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 153, 370, 371, 407);
+    private static final List<Integer> A005188_SEQ_10K = ImmutableList.of(0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 153, 370, 371, 407, 1634, 8208, 9474);
+
+    @Test
+    void givenIntegers_whenCheckArmstrong_shouldReturnExpectedResult() {
+        ARMSTRONG_MAP.forEach((number, result) -> assertEquals(result, ArmstrongNumberUtil.isArmstrong(number)));
+    }
+
+    @Test
+    void givenALimit_whenFindArmstrong_shouldReturnExpectedResult() {
+        assertEquals(A005188_SEQ_1K, ArmstrongNumberUtil.getA005188Sequence(1000));
+        assertEquals(A005188_SEQ_10K, ArmstrongNumberUtil.getA005188Sequence(10000));
+    }
+}

core-java-modules/core-java-numbers-5/src/test/java/com/baeldung/positivenegative/PositiveOrNegativeUnitTest.java

@@ -0,0 +1,29 @@
+package com.baeldung.positivenegative;
+
+import org.junit.jupiter.api.Test;
+
+import static com.baeldung.positivenegative.PositiveOrNegative.Result.*;
+import static org.junit.jupiter.api.Assertions.assertEquals;
+
+class PositiveOrNegativeUnitTest {
+    @Test
+    void givenIntegers_whenChkPositiveOrNegativeByOperator_thenReturnExpectedResult() {
+        assertEquals(POSITIVE, PositiveOrNegative.byOperator(42));
+        assertEquals(ZERO, PositiveOrNegative.byOperator(0));
+        assertEquals(NEGATIVE, PositiveOrNegative.byOperator(-700));
+    }
+
+    @Test
+    void givenIntegers_whenChkPositiveOrNegativeBySignum_thenReturnExpectedResult() {
+        assertEquals(POSITIVE, PositiveOrNegative.bySignum(42));
+        assertEquals(ZERO, PositiveOrNegative.bySignum(0));
+        assertEquals(NEGATIVE, PositiveOrNegative.bySignum(-700));
+    }
+
+    @Test
+    void givenFloats_whenChkPositiveOrNegativeBySignum_thenReturnExpectedResult() {
+        assertEquals(POSITIVE, PositiveOrNegative.bySignum(4.2f));
+        assertEquals(ZERO, PositiveOrNegative.bySignum(0f));
+        assertEquals(NEGATIVE, PositiveOrNegative.bySignum(-7.7f));
+    }
+}

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

@@ -81,7 +81,6 @@
         <maven.compiler.target>1.9</maven.compiler.target>
         <unix4j.version>0.4</unix4j.version>
         <grep4j.version>1.8.7</grep4j.version>
-        <lombok.version>1.18.22</lombok.version>
     </properties>
 
 </project>

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

@@ -66,8 +66,4 @@
         </plugins>
     </build>
 
-    <properties>
-        <lombok.version>1.18.20</lombok.version>
-    </properties>
-
 </project>

core-java-modules/core-java-streams-4/README.md

@@ -3,3 +3,4 @@
 - [Count Occurrences Using Java groupingBy Collector](https://www.baeldung.com/java-groupingby-count)
 - [How to Split a Stream into Multiple Streams](https://www.baeldung.com/java-split-stream)
 - [Filter Java Stream to 1 and Only 1 Element](https://www.baeldung.com/java-filter-stream-unique-element)
+- [Java 8 Streams: Multiple Filters vs. Complex Condition](https://www.baeldung.com/java-streams-multiple-filters-vs-condition)

core-java-modules/core-java-streams-4/pom.xml

@@ -53,6 +53,12 @@
             <artifactId>jmh-generator-annprocess</artifactId>
             <version>${jmh-generator.version}</version>
         </dependency>
+        <dependency>
+            <groupId>org.apache.commons</groupId>
+            <artifactId>commons-lang3</artifactId>
+            <version>3.12.0</version>
+            <scope>test</scope>
+        </dependency>
     </dependencies>
 
     <build>

core-java-modules/core-java-streams-4/src/test/java/com/baeldung/streams/multiplefilters/MultipleFiltersVsComplexConditionFilterOrderUnitTest.java

@@ -0,0 +1,89 @@
+package com.baeldung.streams.multiplefilters;
+
+import static org.assertj.core.api.Assertions.assertThat;
+
+import java.util.concurrent.atomic.AtomicInteger;
+import java.util.stream.IntStream;
+
+import org.junit.Before;
+import org.junit.Test;
+
+public class MultipleFiltersVsComplexConditionFilterOrderUnitTest {
+
+    AtomicInteger numberOfOperations = new AtomicInteger();
+
+    @Before
+    public void beforeEach() {
+        numberOfOperations.set(0);
+    }
+
+    @Test
+    public void givenWrongFilterOrder_whenUsingMultipleFilters_shouldEvaluateManyConditions() {
+        long filteredStreamSize = IntStream.range(0, 100)
+            .boxed()
+            .filter(this::isEvenNumber)
+            .filter(this::isSmallerThanTwenty)
+            .count();
+
+        assertThat(filteredStreamSize).isEqualTo(10);
+        assertThat(numberOfOperations).hasValue(150);
+    }
+
+    @Test
+    public void givenWrongFilterOrder_whenUsingSingleFilters_shouldEvaluateManyConditions() {
+        long filteredStreamSize = IntStream.range(0, 100)
+            .boxed()
+            .filter(i -> isEvenNumber(i) && isSmallerThanTwenty(i))
+            .count();
+
+        assertThat(filteredStreamSize).isEqualTo(10);
+        assertThat(numberOfOperations).hasValue(150);
+    }
+
+    @Test
+    public void givenCorrectFilterOrder_whenUsingMultipleFilters_shouldEvaluateFewerConditions() {
+        long filteredStreamSize = IntStream.range(0, 100)
+            .boxed()
+            .filter(this::isSmallerThanTwenty)
+            .filter(this::isEvenNumber)
+            .count();
+
+        assertThat(filteredStreamSize).isEqualTo(10);
+        assertThat(numberOfOperations).hasValue(120);
+    }
+
+    @Test
+    public void givenCorrectFilterOrder_whenUsingHavingASlowCondition_shouldEvaluateFewerConditions() {
+        long filteredStreamSize = IntStream.range(0, 100)
+            .boxed()
+            .filter(this::isSmallerThanTwenty)
+            .filter(this::isEvenNumber)
+            .filter(this::verySlowFilter)
+            .count();
+
+        assertThat(filteredStreamSize).isEqualTo(10);
+        assertThat(numberOfOperations).hasValue(130);
+    }
+
+    private boolean isEvenNumber(int i) {
+        numberOfOperations.incrementAndGet();
+        return i % 2 == 0;
+    }
+
+    private boolean isSmallerThanTwenty(int i) {
+        numberOfOperations.incrementAndGet();
+        return i < 20;
+    }
+
+    private boolean verySlowFilter(int i) {
+        numberOfOperations.incrementAndGet();
+        //        commented the Thread.sleep() not to slow down the pipeline.
+        //        try {
+        //            Thread.sleep(1000);
+        //        } catch (InterruptedException e) {
+        //            throw new RuntimeException(e);
+        //        }
+        return true;
+    }
+
+}

core-java-modules/core-java-streams-4/src/test/java/com/baeldung/streams/multiplefilters/MultipleFiltersVsComplexConditionFilterPerformanceIntegrationTest.java

@@ -0,0 +1,130 @@
+package com.baeldung.streams.multiplefilters;
+
+import java.text.MessageFormat;
+import java.util.function.Function;
+import java.util.stream.IntStream;
+
+import org.apache.commons.lang3.time.StopWatch;
+import org.junit.Test;
+
+public class MultipleFiltersVsComplexConditionFilterPerformanceIntegrationTest {
+
+//    this test is slow, avoid running it on pipeline
+    @Test
+    public void measureProcessingTimeForEachSolution() {
+
+        averageMultipleMeasurements("Stream with Multiple Filters", this::measureTimeForMultipleFilters, 10_000);
+        averageMultipleMeasurements("Stream with Multiple Filters", this::measureTimeForMultipleFilters, 100_000);
+        averageMultipleMeasurements("Stream with Multiple Filters", this::measureTimeForMultipleFilters, 10_00_000);
+        averageMultipleMeasurements("Stream with Multiple Filters", this::measureTimeForMultipleFilters, 1_0000_000);
+
+        averageMultipleMeasurements("Stream with Complex Condition", this::measureTimeForComplexCondition, 10_000);
+        averageMultipleMeasurements("Stream with Complex Condition", this::measureTimeForComplexCondition, 100_000);
+        averageMultipleMeasurements("Stream with Complex Condition", this::measureTimeForComplexCondition, 10_00_000);
+        averageMultipleMeasurements("Stream with Complex Condition", this::measureTimeForComplexCondition, 1_0000_000);
+
+        averageMultipleMeasurements("Parallel Stream with Multiple Filters", this::measureTimeForParallelStreamWithMultipleFilters, 10_000);
+        averageMultipleMeasurements("Parallel Stream with Multiple Filters", this::measureTimeForParallelStreamWithMultipleFilters, 100_000);
+        averageMultipleMeasurements("Parallel Stream with Multiple Filters", this::measureTimeForParallelStreamWithMultipleFilters, 10_00_000);
+        averageMultipleMeasurements("Parallel Stream with Multiple Filters", this::measureTimeForParallelStreamWithMultipleFilters, 1_0000_000);
+
+        averageMultipleMeasurements("Parallel Stream with Complex Condition", this::measureTimeForParallelStreamWithComplexCondition, 10_000);
+        averageMultipleMeasurements("Parallel Stream with Complex Condition", this::measureTimeForParallelStreamWithComplexCondition, 100_000);
+        averageMultipleMeasurements("Parallel Stream with Complex Condition", this::measureTimeForParallelStreamWithComplexCondition, 10_00_000);
+        averageMultipleMeasurements("Parallel Stream with Complex Condition", this::measureTimeForParallelStreamWithComplexCondition, 1_0000_000);
+
+        averageMultipleMeasurements("Old For Loop with Complex Condition", this::measureTimeForOlfForLoopWithComplexCondition, 10_000);
+        averageMultipleMeasurements("Old For Loop with Complex Condition", this::measureTimeForOlfForLoopWithComplexCondition, 100_000);
+        averageMultipleMeasurements("Old For Loop with Complex Condition", this::measureTimeForOlfForLoopWithComplexCondition, 10_00_000);
+        averageMultipleMeasurements("Old For Loop with Complex Condition", this::measureTimeForOlfForLoopWithComplexCondition, 1_0000_000);
+
+    }
+
+    private void averageMultipleMeasurements(String measurementName, Function<Integer, Long> measurement, int range) {
+        double avgTime = IntStream.range(0, 100)
+            .mapToLong(i -> measurement.apply(range))
+            .average()
+            .orElseThrow();
+
+        System.out.println(MessageFormat.format("{0}; Stream size: {1}; Processing Time (ms): {2}", measurementName, range, avgTime));
+    }
+
+    public long measureTimeForMultipleFilters(int range) {
+        StopWatch watch = new StopWatch();
+        watch.start();
+
+        IntStream.range(0, range)
+            .boxed()
+            .filter(i -> i != 10)
+            .filter(i -> i != 20)
+            .filter(i -> i != 30)
+            .filter(i -> i != 40)
+            .filter(i -> i != 50)
+            .filter(i -> i != 60)
+            .count();
+
+        watch.stop();
+        return watch.getTime();
+    }
+
+    public long measureTimeForParallelStreamWithMultipleFilters(int range) {
+        StopWatch watch = new StopWatch();
+        watch.start();
+
+        IntStream.range(0, range)
+            .boxed()
+            .parallel()
+            .filter(i -> i != 10)
+            .filter(i -> i != 20)
+            .filter(i -> i != 30)
+            .filter(i -> i != 40)
+            .filter(i -> i != 50)
+            .filter(i -> i != 60)
+            .count();
+
+        watch.stop();
+        return watch.getTime();
+    }
+
+    public long measureTimeForComplexCondition(int range) {
+        StopWatch watch = new StopWatch();
+        watch.start();
+
+        IntStream.range(0, range)
+            .boxed()
+            .filter(i -> i != 10 && i != 20 && i != 30 && i != 40 && i != 50 && i != 60)
+            .count();
+
+        watch.stop();
+        return watch.getTime();
+    }
+
+    public long measureTimeForParallelStreamWithComplexCondition(int range) {
+        StopWatch watch = new StopWatch();
+        watch.start();
+
+        IntStream.range(0, range)
+            .boxed()
+            .parallel()
+            .filter(i -> i != 10 && i != 20 && i != 30 && i != 40 && i != 50 && i != 60)
+            .count();
+
+        watch.stop();
+        return watch.getTime();
+    }
+
+    public long measureTimeForOlfForLoopWithComplexCondition(int range) {
+        StopWatch watch = new StopWatch();
+        watch.start();
+
+        int count = 0;
+        for (int i = 0; i <= range; i++) {
+            if (i != 10 && i != 20 && i != 30 && i != 40 && i != 50 && i != 60) {
+                count++;
+            }
+        }
+
+        watch.stop();
+        return watch.getTime();
+    }
+}

core-java-modules/core-java-streams-4/src/test/java/com/baeldung/streams/multiplefilters/MultipleFiltersVsComplexConditionReadabilityUnitTest.java

@@ -0,0 +1,65 @@
+package com.baeldung.streams.multiplefilters;
+
+import static java.util.function.Predicate.not;
+import static org.assertj.core.api.Assertions.assertThat;
+
+import java.util.List;
+import java.util.stream.Collectors;
+
+import org.junit.Before;
+import org.junit.Test;
+
+public class MultipleFiltersVsComplexConditionReadabilityUnitTest {
+
+    private List<Student> students;
+    private Student mathStudent;
+
+    @Before
+    public void beforeEach() {
+        this.mathStudent = new Student();
+        mathStudent.setName("John Doe");
+        mathStudent.setYear(3);
+        mathStudent.setProfile(Student.Profile.MATH);
+        mathStudent.setMarks(List.of(80, 90, 77, 95, 100));
+
+        Student csStudent = new Student();
+        csStudent.setName("Paul Atreides");
+        csStudent.setYear(2);
+        csStudent.setProfile(Student.Profile.COMPUTER_SCIENCE);
+        csStudent.setMarks(List.of(30, 40, 60));
+
+        this.students = List.of(mathStudent, csStudent);
+    }
+
+    @Test
+    public void whenUsingMultipleFilters_dataShouldBeFiltered() {
+        List<Student> filteredStream = students.stream()
+            .filter(s -> s.getMarksAverage() > 50)
+            .filter(s -> s.getMarks().size() > 3)
+            .filter(not(s -> s.getProfile() == Student.Profile.PHYSICS))
+            .collect(Collectors.toList());
+
+        assertThat(filteredStream).containsExactly(mathStudent);
+    }
+
+    @Test
+    public void whenUsingSingleComplexFilter_dataShouldBeFiltered() {
+        List<Student> filteredStream = students.stream()
+            .filter(s -> s.getMarksAverage() > 50
+                && s.getMarks().size() > 3
+                && s.getProfile() != Student.Profile.PHYSICS)
+            .collect(Collectors.toList());
+
+        assertThat(filteredStream).containsExactly(mathStudent);
+    }
+
+    @Test
+    public void whenUsingSingleComplexFilterExtracted_dataShouldBeFiltered() {
+        List<Student> filteredStream = students.stream()
+            .filter(Student::isEligibleForScholarship)
+            .collect(Collectors.toList());
+
+        assertThat(filteredStream).containsExactly(mathStudent);
+    }
+
+}

core-java-modules/core-java-streams-4/src/test/java/com/baeldung/streams/multiplefilters/Student.java

@@ -0,0 +1,60 @@
+package com.baeldung.streams.multiplefilters;
+
+import java.util.List;
+import java.util.stream.Collectors;
+
+public class Student {
+
+    private String name;
+    private int year;
+    private List<Integer> marks;
+    private Profile profile;
+
+    public enum Profile {
+        COMPUTER_SCIENCE,
+        MATH,
+        PHYSICS
+    }
+
+    public double getMarksAverage() {
+        return marks.stream().collect(Collectors.averagingInt(m -> m));
+    }
+
+    public boolean isEligibleForScholarship() {
+        return getMarksAverage() > 50
+            && marks.size() > 3
+            && profile != Profile.PHYSICS;
+    }
+
+    public String getName() {
+        return name;
+    }
+
+    public void setName(String name) {
+        this.name = name;
+    }
+
+    public int getYear() {
+        return year;
+    }
+
+    public void setYear(int year) {
+        this.year = year;
+    }
+
+    public List<Integer> getMarks() {
+        return marks;
+    }
+
+    public void setMarks(List<Integer> marks) {
+        this.marks = marks;
+    }
+
+    public Profile getProfile() {
+        return profile;
+    }
+
+    public void setProfile(Profile profile) {
+        this.profile = profile;
+    }
+}

core-java-modules/core-java-string-conversions-2/README.md

@@ -12,4 +12,5 @@ This module contains articles about string conversions from/to another type.
 - [Convert a ByteBuffer to String in Java](https://www.baeldung.com/java-bytebuffer-to-string)
 - [Convert String to Float and Back in Java](https://www.baeldung.com/java-string-to-float)
 - [Difference Between parseInt() and valueOf() in Java](https://www.baeldung.com/java-integer-parseint-vs-valueof)
+- [Integer.toString() vs String.valueOf() in Java](https://www.baeldung.com/java-tostring-valueof)
 - More articles: [[<-- prev]](/core-java-modules/core-java-string-conversions)

core-java-modules/core-java-string-conversions-2/src/test/java/com/baeldung/inttostring/IntToStringUnitTest.java

@@ -1,4 +1,4 @@
-package com.baeldung.chararraytostring;
+package com.baeldung.inttostring;
 
 import static org.junit.Assert.assertEquals;
 
@@ -23,7 +23,8 @@ public class IntToStringUnitTest {
     @Test(expected = NullPointerException.class)
     public void whenNullIntegerObjectIsPassed_thenShouldThrowException() {
         Integer i = null;
-        System.out.println(String.valueOf(i)); // it prints "null"
-        System.out.println(i.toString()); 
+        // NOTE: primitive int can never be null, we are checking this example to check in what case the exception is thrown by these methods.
+        System.out.println(String.valueOf(i)); // prints "null" as the call goes to String.valueOf(Object obj) method
+        System.out.println(i.toString()); // throws NPE
     }
 }

core-java-modules/core-java-string-operations-4/README.md

@@ -9,3 +9,4 @@
 - [Check if a Character is a Vowel in Java](https://www.baeldung.com/java-check-character-vowel)
 - [How to Truncate a String in Java](https://www.baeldung.com/java-truncating-strings)
 - [Remove Whitespace From a String in Java](https://www.baeldung.com/java-string-remove-whitespace)
+- [Named Placeholders in String Formatting](https://www.baeldung.com/java-string-formatting-named-placeholders)

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

@@ -76,7 +76,6 @@
     <properties>
         <commons-math3.version>3.6.1</commons-math3.version>
         <joda.version>2.10</joda.version>
-        <lombok.version>1.18.22</lombok.version>
         <asspectj.version>1.8.9</asspectj.version>
         <jmockit.version>1.44</jmockit.version>
         <mockito-inline.version>4.1.0</mockito-inline.version>

core-java-modules/pom.xml

@@ -37,7 +37,6 @@
         <module>core-java-collections-list</module>
         <module>core-java-collections-list-2</module>
         <module>core-java-collections-list-3</module>
-        <module>core-java-collections-list-4</module>
         <module>core-java-collections-maps</module>
         <module>core-java-collections-maps-2</module>
         <module>core-java-collections-maps-3</module>

docker-modules/docker-caching/multi-module-caching/pom.xml

@@ -26,7 +26,7 @@
 
     <properties>
         <java.version>1.8</java.version>
-        <guava.version>31.0.1-jre</guava.version>
+        <guava.version>31.1-jre</guava.version>
     </properties>
 
 </project>

docker-modules/docker-caching/single-module-caching/pom.xml

@@ -48,7 +48,7 @@
     <properties>
         <maven.compiler.source>8</maven.compiler.source>
         <maven.compiler.target>8</maven.compiler.target>
-        <guava.version>31.0.1-jre</guava.version>
+        <guava.version>31.1-jre</guava.version>
     </properties>
 
 </project>

docker-modules/docker-compose/README.md

@@ -4,4 +4,5 @@
 - [How to Get Docker-Compose to Always Use the Latest Image](https://www.baeldung.com/ops/docker-compose-latest-image)
 - [Communication Between Multiple Docker Compose Projects](https://www.baeldung.com/ops/docker-compose-communication)
 - [Difference Between links and depends_on in Docker Compose](https://www.baeldung.com/ops/docker-compose-links-depends-on)
+- [Mounting Multiple Volumes on a Docker Container](https://www.baeldung.com/ops/docker-mounting-multiple-volumes)
 

gradle-modules/gradle-7/README.md

@@ -0,0 +1,4 @@
+
+### Relevant Articles:
+
+- [How to Configure Conditional Dependencies in Gradle](https://www.baeldung.com/gradle-conditional-dependencies)

graphql-modules/graphql-error-handling/pom.xml

@@ -36,12 +36,10 @@
         <dependency>
             <groupId>org.projectlombok</groupId>
             <artifactId>lombok</artifactId>
-            <version>${lombok.version}</version>
         </dependency>
         <dependency>
             <groupId>com.h2database</groupId>
             <artifactId>h2</artifactId>
-            <version>${h2.version}</version>
         </dependency>
         <dependency>
             <groupId>org.springframework.boot</groupId>
@@ -51,13 +49,12 @@
         <dependency>
             <groupId>com.graphql-java</groupId>
             <artifactId>graphql-spring-boot-starter-test</artifactId>
-            <scope>test</scope>
             <version>${graphql-spring-boot-starter.version}</version>
+            <scope>test</scope>
         </dependency>
         <dependency>
             <groupId>org.skyscreamer</groupId>
             <artifactId>jsonassert</artifactId>
-            <version>${jsonassert.version}</version>
             <scope>test</scope>
         </dependency>
     </dependencies>
@@ -65,7 +62,6 @@
     <properties>
         <graphql-spring-boot-starter.version>5.0.2</graphql-spring-boot-starter.version>
         <graphql-java-tools.version>5.2.4</graphql-java-tools.version>
-        <jsonassert.version>1.5.0</jsonassert.version>
     </properties>
 
 </project>

graphql-modules/graphql-error-handling/src/main/java/com/baeldung/graphql/error/handling/exception/GraphQLErrorAdapter.java

@@ -1,6 +1,6 @@
 package com.baeldung.graphql.error.handling.exception;
 
-import graphql.ErrorType;
+import graphql.ErrorClassification;
 import graphql.ExceptionWhileDataFetching;
 import graphql.GraphQLError;
 import graphql.language.SourceLocation;
@@ -27,7 +27,7 @@ public class GraphQLErrorAdapter implements GraphQLError {
     }
 
     @Override
-    public ErrorType getErrorType() {
+    public ErrorClassification getErrorType() {
         return error.getErrorType();
     }
 

jackson-modules/jackson-conversions-2/README.md

@@ -12,4 +12,5 @@ This module contains articles about Jackson conversions.
 - [Jackson: java.util.LinkedHashMap cannot be cast to X](https://www.baeldung.com/jackson-linkedhashmap-cannot-be-cast)
 - [Deserialize Snake Case to Camel Case With Jackson](https://www.baeldung.com/jackson-deserialize-snake-to-camel-case)
 - [Serialize and Deserialize Booleans as Integers With Jackson](https://www.baeldung.com/jackson-booleans-as-integers)
+- [Reading JSON From a URL in Java](https://www.baeldung.com/java-read-json-from-url)
 - More articles: [[<-- prev]](../jackson-conversions)

jackson-modules/jackson-conversions-2/pom.xml

@@ -32,6 +32,18 @@
             <artifactId>jackson-dataformat-csv</artifactId>
             <version>${jackson.version}</version>
         </dependency>
+
+        <dependency>
+            <groupId>org.mock-server</groupId>
+            <artifactId>mockserver-netty</artifactId>
+            <version>${mockserver-netty.version}</version>
+            <scope>test</scope>        
+        </dependency>
+        <dependency>
+            <groupId>org.json</groupId>
+            <artifactId>json</artifactId>
+            <version>${json.version}</version>
+        </dependency>
     </dependencies>
 
     <build>
@@ -44,4 +56,9 @@
         </resources>
     </build>
 
+    <properties>
+        <mockserver-netty.version>5.13.2</mockserver-netty.version>
+        <json.version>20220320</json.version>
+    </properties>
+
 </project>

jackson-modules/jackson-conversions-2/src/main/java/com/baeldung/jackson/jsonurlreader/JsonUrlReader.java

@@ -0,0 +1,62 @@
+package com.baeldung.jackson.jsonurlreader;
+
+import java.io.BufferedReader;
+import java.io.IOException;
+import java.io.InputStream;
+import java.io.InputStreamReader;
+import java.net.MalformedURLException;
+import java.net.URL;
+import java.nio.charset.Charset;
+
+import org.apache.commons.io.IOUtils;
+import org.json.JSONObject;
+
+import com.fasterxml.jackson.core.exc.StreamReadException;
+import com.fasterxml.jackson.databind.DatabindException;
+import com.fasterxml.jackson.databind.JsonNode;
+import com.fasterxml.jackson.databind.ObjectMapper;
+
+public class JsonUrlReader {
+
+    public static void main(String[] args) throws StreamReadException, DatabindException, MalformedURLException, IOException {
+        String url = args[0];
+
+        JsonNode node = JsonUrlReader.get(url);
+        System.out.println(node.toPrettyString());
+    }
+
+    public static String stream(String url) throws IOException {
+        try (InputStream input = new URL(url).openStream()) {
+            InputStreamReader isr = new InputStreamReader(input, Charset.forName("UTF-8"));
+            BufferedReader reader = new BufferedReader(isr);
+            StringBuilder json = new StringBuilder();
+            int c;
+            while ((c = reader.read()) != -1) {
+                json.append((char) c);
+            }
+            return json.toString();
+        }
+    }
+
+    public static JsonNode get(String url) throws StreamReadException, DatabindException, MalformedURLException, IOException {
+        ObjectMapper mapper = new ObjectMapper();
+        JsonNode json = mapper.readTree(new URL(url));
+        return json;
+    }
+
+    public static <T> T get(String url, Class<T> type) throws StreamReadException, DatabindException, MalformedURLException, IOException {
+        ObjectMapper mapper = new ObjectMapper();
+        T entity = mapper.readValue(new URL(url), type);
+        return entity;
+    }
+
+    public static String getString(String url) throws StreamReadException, DatabindException, MalformedURLException, IOException {
+        return get(url).toPrettyString();
+    }
+
+    public static JSONObject getJson(String url) throws MalformedURLException, IOException {
+        String json = IOUtils.toString(new URL(url), Charset.forName("UTF-8"));
+        JSONObject object = new JSONObject(json);
+        return object;
+    }
+}

jackson-modules/jackson-conversions-2/src/main/java/com/baeldung/jackson/jsonurlreader/data/Example.java

@@ -0,0 +1,40 @@
+package com.baeldung.jackson.jsonurlreader.data;
+
+public class Example {
+    private String name;
+    private Integer n;
+    private Boolean real;
+
+    public Example() {
+    }
+
+    public Example(String name, Integer n, Boolean real) {
+        this.name = name;
+        this.n = n;
+        this.real = real;
+    }
+
+    public String getName() {
+        return name;
+    }
+
+    public void setName(String name) {
+        this.name = name;
+    }
+
+    public Integer getN() {
+        return n;
+    }
+
+    public void setN(Integer n) {
+        this.n = n;
+    }
+
+    public Boolean getReal() {
+        return real;
+    }
+
+    public void setReal(Boolean real) {
+        this.real = real;
+    }
+}

jackson-modules/jackson-conversions-2/src/test/java/com/baeldung/jackson/jsonurlreader/JsonMockServer.java

@@ -0,0 +1,62 @@
+package com.baeldung.jackson.jsonurlreader;
+
+import static org.mockserver.integration.ClientAndServer.startClientAndServer;
+import static org.mockserver.model.HttpRequest.request;
+import static org.mockserver.model.HttpResponse.response;
+
+import java.io.IOException;
+import java.net.ServerSocket;
+
+import org.junit.jupiter.api.AfterAll;
+import org.junit.jupiter.api.BeforeAll;
+import org.mockserver.client.MockServerClient;
+import org.mockserver.integration.ClientAndServer;
+import org.mockserver.model.HttpStatusCode;
+
+import com.baeldung.jackson.jsonurlreader.data.Example;
+
+public class JsonMockServer {
+    protected static final String JSON_RESPONSE = "{ \"name\": \"A\", \"n\": 1, \"real\": true }";
+    protected static final Example OBJECT_RESPONSE = new Example("A", 1, true);
+
+    protected static String serviceUrl;
+
+    private static final String SERVER_ADDRESS = "127.0.0.1";
+    private static final String PATH = "/sample-json";
+
+    private static ClientAndServer mockServer;
+    private static int serverPort;
+
+    @BeforeAll
+    static void startServer() throws IOException {
+        serverPort = getFreePort();
+        serviceUrl = "http://" + SERVER_ADDRESS + ":" + serverPort + PATH;
+
+        mockServer = startClientAndServer(serverPort);
+
+        mockJsonRequest();
+    }
+
+    @AfterAll
+    static void stopServer() {
+        mockServer.stop();
+    }
+
+    @SuppressWarnings("resource")
+    private static void mockJsonRequest() {
+        new MockServerClient(SERVER_ADDRESS, serverPort)
+          .when(request()
+            .withPath(PATH)
+            .withMethod("GET"))
+          .respond(response()
+            .withStatusCode(HttpStatusCode.OK_200.code())
+            .withBody(JSON_RESPONSE)
+        );
+    }
+
+    private static int getFreePort() throws IOException {
+        try (ServerSocket serverSocket = new ServerSocket(0)) {
+            return serverSocket.getLocalPort();
+        }
+    }
+}

jackson-modules/jackson-conversions-2/src/test/java/com/baeldung/jackson/jsonurlreader/JsonUrlReaderIntegrationTest.java

@@ -0,0 +1,50 @@
+package com.baeldung.jackson.jsonurlreader;
+
+import static org.junit.Assert.assertEquals;
+
+import org.json.JSONObject;
+import org.junit.jupiter.api.Test;
+
+import com.baeldung.jackson.jsonurlreader.data.Example;
+import com.fasterxml.jackson.databind.JsonNode;
+
+public class JsonUrlReaderIntegrationTest extends JsonMockServer {
+
+    @Test
+    public void whenStreamUrl_thenJsonStringReturned() throws Exception {
+        String jsonNode = JsonUrlReader.stream(serviceUrl);
+
+        assertEquals(jsonNode, JSON_RESPONSE);
+    }
+
+    @Test
+    public void whenGetUrl_thenJsonNodeReturned() throws Exception {
+        JsonNode jsonNode = JsonUrlReader.get(serviceUrl);
+
+        assertEquals(jsonNode.get("name")
+            .textValue(), "A");
+        assertEquals(jsonNode.get("n")
+            .intValue(), 1);
+        assertEquals(jsonNode.get("real")
+            .booleanValue(), true);
+    }
+
+    @Test
+    public void givenType_whenGetUrl_thenTypeReturned() throws Exception {
+        Example object = JsonUrlReader.get(serviceUrl, Example.class);
+
+        Integer n = 1;
+        assertEquals(object.getName(), "A");
+        assertEquals(object.getN(), n);
+        assertEquals(object.getReal(), true);
+    }
+
+    @Test
+    public void whenGetJsonUrl_thenJsonObjectReturned() throws Exception {
+        JSONObject jsonObject = JsonUrlReader.getJson(serviceUrl);
+
+        assertEquals(jsonObject.getString("name"), "A");
+        assertEquals(jsonObject.getInt("n"), 1);
+        assertEquals(jsonObject.getBoolean("real"), true);
+    }
+}

jhipster-modules/jhipster-microservice/pom.xml

@@ -7,7 +7,7 @@
     <packaging>pom</packaging>
 
 	<parent>
-        <artifactId>jhipster</artifactId>
+        <artifactId>jhipster-modules</artifactId>
         <groupId>com.baeldung.jhipster</groupId>
         <version>1.0.0-SNAPSHOT</version>
     </parent>

jhipster-modules/jhipster-monolithic/pom.xml

@@ -7,7 +7,7 @@
     <description>JHipster Monolithic Application</description>
 
     <parent>
-        <artifactId>jhipster</artifactId>
+        <artifactId>jhipster-modules</artifactId>
         <groupId>com.baeldung.jhipster</groupId>
         <version>1.0.0-SNAPSHOT</version>
     </parent>

jhipster-modules/jhipster-uaa/pom.xml

@@ -7,7 +7,7 @@
     <packaging>pom</packaging>
 
 	<parent>
-        <artifactId>jhipster</artifactId>
+        <artifactId>jhipster-modules</artifactId>
         <groupId>com.baeldung.jhipster</groupId>
         <version>1.0.0-SNAPSHOT</version>
     </parent>

jhipster-modules/pom.xml

@@ -3,9 +3,9 @@
     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.jhipster</groupId>
-    <artifactId>jhipster</artifactId>
+    <artifactId>jhipster-modules</artifactId>
     <version>1.0.0-SNAPSHOT</version>
-    <name>jhipster</name>
+    <name>jhipster-modules</name>
     <packaging>pom</packaging>
 
     <parent>

json-modules/gson/pom.xml

@@ -67,7 +67,6 @@
     <properties>
         <gson.version>2.8.0</gson.version>
         <joda-time.version>2.9.6</joda-time.version>
-        <guava.version>11.0.2</guava.version>
     </properties>
 
 </project>

json-modules/json/pom.xml

@@ -15,17 +15,11 @@
     </parent>
 
     <dependencies>
-        <dependency>
-            <groupId>org.everit.json</groupId>
-            <artifactId>org.everit.json.schema</artifactId>
-            <version>${everit.json.schema.version}</version>
-            <exclusions>
-                <exclusion>
-                    <artifactId>commons-logging</artifactId>
-                    <groupId>commons-logging</groupId>
-                </exclusion>
-            </exclusions>
-        </dependency>
+		<dependency>
+			<groupId>com.networknt</groupId>
+			<artifactId>json-schema-validator</artifactId>
+			<version>${networknt.json.schema.version}</version>
+		</dependency>
         <dependency>
             <groupId>org.json</groupId>
             <artifactId>json</artifactId>
@@ -72,7 +66,7 @@
     </dependencies>
 
     <properties>
-        <everit.json.schema.version>1.4.1</everit.json.schema.version>
+        <networknt.json.schema.version>1.0.72</networknt.json.schema.version>
         <jsonb-api.version>1.0</jsonb-api.version>
         <yasson.version>1.0.1</yasson.version>
         <json.version>20211205</json.version>

json-modules/json/src/test/java/com/baeldung/json/schema/JSONSchemaUnitTest.java

@@ -1,32 +1,44 @@
 package com.baeldung.json.schema;
 
-import org.everit.json.schema.Schema;
-import org.everit.json.schema.ValidationException;
-import org.everit.json.schema.loader.SchemaLoader;
+import static org.assertj.core.api.Assertions.assertThat;
+
+import java.io.IOException;
+import java.util.Set;
 
-import org.json.JSONObject;
-import org.json.JSONTokener;
 import org.junit.Test;
 
+import com.fasterxml.jackson.databind.JsonNode;
+import com.fasterxml.jackson.databind.ObjectMapper;
+import com.networknt.schema.JsonSchema;
+import com.networknt.schema.JsonSchemaFactory;
+import com.networknt.schema.SpecVersion;
+import com.networknt.schema.ValidationMessage;
+
 public class JSONSchemaUnitTest {
 
-    @Test(expected = ValidationException.class)
-    public void givenInvalidInput_whenValidating_thenInvalid() {
+    private ObjectMapper mapper = new ObjectMapper();
 
-        JSONObject jsonSchema = new JSONObject(new JSONTokener(JSONSchemaUnitTest.class.getResourceAsStream("/schema.json")));
-        JSONObject jsonSubject = new JSONObject(new JSONTokener(JSONSchemaUnitTest.class.getResourceAsStream("/product_invalid.json")));
+    @Test
+    public void givenInvalidInput_whenValidating_thenInvalid() throws IOException {
 
-        Schema schema = SchemaLoader.load(jsonSchema);
-        schema.validate(jsonSubject);
+        JsonSchemaFactory factory = JsonSchemaFactory.getInstance(SpecVersion.VersionFlag.V4);
+        JsonSchema jsonSchema = factory.getSchema(JSONSchemaUnitTest.class.getResourceAsStream("/schema.json"));
+
+        JsonNode jsonNode = mapper.readTree(JSONSchemaUnitTest.class.getResourceAsStream("/product_invalid.json"));
+        Set<ValidationMessage> errors = jsonSchema.validate(jsonNode);
+        assertThat(errors).isNotEmpty()
+            .asString()
+            .contains("price: must have a minimum value of 0");
     }
 
     @Test
-    public void givenValidInput_whenValidating_thenValid() {
+    public void givenValidInput_whenValidating_thenValid() throws IOException {
 
-        JSONObject jsonSchema = new JSONObject(new JSONTokener(JSONSchemaUnitTest.class.getResourceAsStream("/schema.json")));
-        JSONObject jsonSubject = new JSONObject(new JSONTokener(JSONSchemaUnitTest.class.getResourceAsStream("/product_valid.json")));
+        JsonSchemaFactory factory = JsonSchemaFactory.getInstance(SpecVersion.VersionFlag.V4);
+        JsonSchema jsonSchema = factory.getSchema(JSONSchemaUnitTest.class.getResourceAsStream("/schema.json"));
 
-        Schema schema = SchemaLoader.load(jsonSchema);
-        schema.validate(jsonSubject);
+        JsonNode jsonNode = mapper.readTree(JSONSchemaUnitTest.class.getResourceAsStream("/product_valid.json"));
+        Set<ValidationMessage> errors = jsonSchema.validate(jsonNode);
+        assertThat(errors).isEmpty();
     }
 }

libraries-3/pom.xml

@@ -249,7 +249,6 @@
 
     <properties>
         <jcommander.version>1.78</jcommander.version>
-        <lombok.version>1.18.6</lombok.version>
         <cactoos.version>0.43</cactoos.version>
         <airline.version>2.7.2</airline.version>
         <cache2k.version>1.2.3.Final</cache2k.version>

libraries-data-db/pom.xml

@@ -159,7 +159,6 @@
                                     classname="com.gs.fw.common.mithra.generator.MithraGenerator" />
                                 <gen-reladomo
                                     xml="${project.basedir}/src/main/resources/reladomo/ReladomoClassList.xml"
-                                    generateGscListMethod="true"
                                     generatedDir="${project.build.directory}/generated-sources/reladomo"
                                     nonGeneratedDir="${project.basedir}/src/main/java" />
 
@@ -268,7 +267,7 @@
 
     <properties>
         <ebean.plugin.version>11.11.2</ebean.plugin.version>
-        <reladomo.version>16.5.1</reladomo.version>
+        <reladomo.version>18.1.0</reladomo.version>
         <build-helper-maven-plugin.version>3.0.0</build-helper-maven-plugin.version>
         <maven-antrun-plugin.version>1.8</maven-antrun-plugin.version>
         <ormlite.version>5.0</ormlite.version>

libraries-data-db/src/main/resources/db.sql

@@ -8,7 +8,7 @@ create table dept(
   loc    varchar(13),
   constraint pk_dept primary key (deptno)
 );
- 
+
 create table emp(
   empno    numeric,
   ename    varchar(10),
@@ -26,25 +26,25 @@ insert into dept values(10, 'ACCOUNTING', 'NEW YORK');
 insert into dept values(20, 'RESEARCH', 'DALLAS');
 insert into dept values(30, 'SALES', 'CHICAGO');
 insert into dept values(40, 'OPERATIONS', 'BOSTON');
- 
+
 insert into emp values(
  7839, 'KING', 'PRESIDENT', null,
- to_date('17-11-1981','dd-mm-yyyy'),
+ parsedatetime('17-11-1981','dd-MM-yyyy'),
  7698, null, 10
 );
 insert into emp values(
  7698, 'BLAKE', 'MANAGER', 7839,
- to_date('1-5-1981','dd-mm-yyyy'),
+ parsedatetime('01-05-1981','dd-MM-yyyy'),
  7782, null, 20
 );
 insert into emp values(
  7782, 'CLARK', 'MANAGER', 7839,
- to_date('9-6-1981','dd-mm-yyyy'),
+ parsedatetime('09-06-1981','dd-MM-yyyy'),
  7566, null, 30
 );
 insert into emp values(
  7566, 'JONES', 'MANAGER', 7839,
- to_date('2-4-1981','dd-mm-yyyy'),
+ parsedatetime('02-04-1981','dd-MM-yyyy'),
  7839, null, 40
 );
 

libraries-files/pom.xml

@@ -0,0 +1,48 @@
+<?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-files</artifactId>
+
+    <parent>
+        <artifactId>parent-modules</artifactId>
+        <groupId>com.baeldung</groupId>
+        <version>1.0.0-SNAPSHOT</version>
+    </parent>
+
+    <dependencies>
+        <dependency>
+            <groupId>org.ini4j</groupId>
+            <artifactId>ini4j</artifactId>
+            <version>${org.ini4j.version}</version>
+        </dependency>
+        <dependency>
+            <groupId>org.apache.commons</groupId>
+            <artifactId>commons-configuration2</artifactId>
+            <version>${commons-configuration2}</version>
+        </dependency>
+        <dependency>
+            <groupId>com.fasterxml.jackson.core</groupId>
+            <artifactId>jackson-annotations</artifactId>
+            <version>${jackson.version}</version>
+        </dependency>
+        <dependency>
+            <groupId>com.fasterxml.jackson.core</groupId>
+            <artifactId>jackson-core</artifactId>
+            <version>${jackson.version}</version>
+        </dependency>
+        <dependency>
+            <groupId>com.fasterxml.jackson.core</groupId>
+            <artifactId>jackson-databind</artifactId>
+            <version>${jackson.version}</version>
+        </dependency>
+    </dependencies>
+
+    <properties>
+        <org.ini4j.version>0.5.4</org.ini4j.version>
+        <commons-configuration2>2.8.0</commons-configuration2>
+        <jackson.version>2.13.1</jackson.version>
+    </properties>
+
+</project>

libraries-files/src/main/java/com/baeldung/ini/CommonsParser.java

@@ -0,0 +1,45 @@
+package com.baeldung.ini;
+
+import org.apache.commons.configuration2.INIConfiguration;
+import org.apache.commons.configuration2.SubnodeConfiguration;
+import org.apache.commons.configuration2.ex.ConfigurationException;
+
+import java.io.BufferedReader;
+import java.io.File;
+import java.io.FileReader;
+import java.io.IOException;
+import java.util.*;
+
+public class CommonsParser {
+    public static Map<String, Map<String, String>> parseIniFile(File fileToParse) throws IOException, ConfigurationException {
+        Map<String, Map<String, String>> iniFileContents = new HashMap<>();
+
+        INIConfiguration iniConfiguration = new INIConfiguration();
+        try (FileReader fileReader = new FileReader(fileToParse)) {
+            iniConfiguration.read(fileReader);
+        }
+
+        for (String section : iniConfiguration.getSections()) {
+            Map<String, String> subSectionMap = new HashMap<>();
+            SubnodeConfiguration confSection = iniConfiguration.getSection(section);
+            Iterator<String> keyIterator = confSection.getKeys();
+            while (keyIterator.hasNext()) {
+                String key = keyIterator.next();
+                String value = confSection.getProperty(key)
+                        .toString();
+                subSectionMap.put(key, value);
+            }
+            iniFileContents.put(section, subSectionMap);
+        }
+        return iniFileContents;
+    }
+
+    public static String readIniFileValue(File fileToParse, String section, String value) throws IOException, ConfigurationException {
+        INIConfiguration iniConfiguration = new INIConfiguration();
+        try (FileReader fileReader = new FileReader(fileToParse)) {
+            iniConfiguration.read(fileReader);
+        }
+
+        return iniConfiguration.getSection(section).getProperty(value).toString();
+    }
+}

libraries-files/src/main/java/com/baeldung/ini/Ini4JParser.java

@@ -0,0 +1,23 @@
+package com.baeldung.ini;
+
+import org.ini4j.Ini;
+
+import java.io.File;
+import java.io.IOException;
+import java.util.*;
+
+import static java.util.stream.Collectors.toMap;
+
+public class Ini4JParser {
+
+    public static Map<String, Map<String, String>> parseIniFile(File fileToParse) throws IOException {
+        Ini ini = new Ini(fileToParse);
+        return ini.entrySet().stream()
+                .collect(toMap(Map.Entry::getKey, Map.Entry::getValue));
+    }
+
+    public static String readIniFileValue(File fileToParse, String section, String key) throws IOException {
+        Ini ini = new Ini(fileToParse);
+        return ini.get(section, key);
+    }
+}

libraries-files/src/main/java/com/baeldung/ini/MyConfiguration.java

@@ -0,0 +1,109 @@
+package com.baeldung.ini;
+
+import com.fasterxml.jackson.annotation.JsonProperty;
+import com.fasterxml.jackson.databind.PropertyNamingStrategies;
+import com.fasterxml.jackson.databind.annotation.JsonNaming;
+
+public class MyConfiguration {
+
+    @JsonNaming(PropertyNamingStrategies.KebabCaseStrategy.class)
+    public static class Fonts {
+        private String letter;
+        private int textSize;
+
+        public String getLetter() {
+            return letter;
+        }
+
+        public void setLetter(String letter) {
+            this.letter = letter;
+        }
+
+        public int getTextSize() {
+            return textSize;
+        }
+
+        public void setTextSize(int textSize) {
+            this.textSize = textSize;
+        }
+    }
+
+    public static class Background {
+        private String color;
+
+        public String getColor() {
+            return color;
+        }
+
+        public void setColor(String color) {
+            this.color = color;
+        }
+    }
+
+    @JsonNaming(PropertyNamingStrategies.UpperCamelCaseStrategy.class)
+    public static class RequestResult {
+        private int requestCode;
+
+        public int getRequestCode() {
+            return requestCode;
+        }
+
+        public void setRequestCode(int requestCode) {
+            this.requestCode = requestCode;
+        }
+    }
+
+    @JsonNaming(PropertyNamingStrategies.UpperCamelCaseStrategy.class)
+    public static class ResponseResult {
+        private int resultCode;
+
+        public int getResultCode() {
+            return resultCode;
+        }
+
+        public void setResultCode(int resultCode) {
+            this.resultCode = resultCode;
+        }
+    }
+
+    private Fonts fonts;
+    private Background background;
+
+    @JsonProperty("RequestResult")
+    private RequestResult requestResult;
+
+    @JsonProperty("ResponseResult")
+    private ResponseResult responseResult;
+
+    public Fonts getFonts() {
+        return fonts;
+    }
+
+    public void setFonts(Fonts fonts) {
+        this.fonts = fonts;
+    }
+
+    public Background getBackground() {
+        return background;
+    }
+
+    public void setBackground(Background background) {
+        this.background = background;
+    }
+
+    public RequestResult getRequestResult() {
+        return requestResult;
+    }
+
+    public void setRequestResult(RequestResult requestResult) {
+        this.requestResult = requestResult;
+    }
+
+    public ResponseResult getResponseResult() {
+        return responseResult;
+    }
+
+    public void setResponseResult(ResponseResult responseResult) {
+        this.responseResult = responseResult;
+    }
+}

libraries-files/src/test/java/com/baeldung/ini/CommonsParserUnitTest.java

@@ -0,0 +1,32 @@
+package com.baeldung.ini;
+
+import org.junit.jupiter.api.Test;
+
+import java.io.File;
+import java.nio.file.Paths;
+import java.util.Map;
+
+import static com.baeldung.ini.CommonsParser.parseIniFile;
+import static com.baeldung.ini.CommonsParser.readIniFileValue;
+import static org.assertj.core.api.Assertions.assertThat;
+
+class CommonsParserUnitTest {
+
+    private static final File TEST_FILE = Paths.get("src", "test", "resources", "sample.ini").toFile();
+
+    @Test
+    void givenIniFileThenCanParseWithIni4j() throws Exception {
+        Map<String, Map<String, String>> result =
+                parseIniFile(TEST_FILE);
+
+        assertThat(result.get("fonts"))
+                .containsEntry("letter", "bold")
+                .containsEntry("text-size", "28");
+    }
+
+    @Test
+    void givenIniFileThenCanReadKeyWithIni4j() throws Exception {
+        assertThat(readIniFileValue(TEST_FILE, "fonts", "letter"))
+                .isEqualTo("bold");
+    }
+}

libraries-files/src/test/java/com/baeldung/ini/Ini4JParserUnitTest.java

@@ -0,0 +1,32 @@
+package com.baeldung.ini;
+
+import org.junit.jupiter.api.Test;
+
+import java.io.File;
+import java.nio.file.Paths;
+import java.util.Map;
+
+import static com.baeldung.ini.Ini4JParser.readIniFileValue;
+import static com.baeldung.ini.Ini4JParser.parseIniFile;
+import static org.assertj.core.api.Assertions.assertThat;
+
+class Ini4JParserUnitTest {
+
+    private static final File TEST_FILE = Paths.get("src", "test", "resources", "sample.ini").toFile();
+
+    @Test
+    void givenIniFileThenCanParseWithIni4j() throws Exception {
+        Map<String, Map<String, String>> result =
+          parseIniFile(TEST_FILE);
+
+        assertThat(result.get("fonts"))
+          .containsEntry("letter", "bold")
+          .containsEntry("text-size", "28");
+    }
+
+    @Test
+    void givenIniFileThenCanReadKeyFromIt() throws Exception {
+        assertThat(readIniFileValue(TEST_FILE, "fonts", "letter"))
+                .isEqualTo("bold");
+    }
+}

libraries-files/src/test/java/com/baeldung/ini/SerializeIntoPojoUnitTest.java

@@ -0,0 +1,31 @@
+package com.baeldung.ini;
+
+import com.fasterxml.jackson.databind.ObjectMapper;
+import org.junit.jupiter.api.Test;
+
+import java.io.File;
+import java.nio.file.Paths;
+import java.util.Map;
+
+import static com.baeldung.ini.Ini4JParser.parseIniFile;
+import static org.assertj.core.api.Assertions.assertThat;
+
+class SerializeIntoPojoUnitTest {
+
+    private static final File TEST_FILE = Paths.get("src", "test", "resources", "sample.ini").toFile();
+
+    @Test
+    void givenAnIniFileThenCanLoadAsPojo() throws Exception {
+        ObjectMapper objectMapper = new ObjectMapper();
+
+        Map<String, Map<String, String>> iniKeys = parseIniFile(TEST_FILE);
+
+        MyConfiguration config = objectMapper.convertValue(iniKeys, MyConfiguration.class);
+
+        assertThat(config.getFonts().getLetter()).isEqualTo("bold");
+        assertThat(config.getFonts().getTextSize()).isEqualTo(28);
+        assertThat(config.getBackground().getColor()).isEqualTo("white");
+        assertThat(config.getRequestResult().getRequestCode()).isEqualTo(1);
+        assertThat(config.getResponseResult().getResultCode()).isZero();
+    }
+}

libraries-files/src/test/resources/sample.ini

@@ -0,0 +1,14 @@
+; for 16-bit app support
+
+[fonts]
+letter=bold
+text-size=28
+
+[background]
+color=white
+
+[RequestResult]
+RequestCode=1
+
+[ResponseResult]
+ResultCode=0

logging-modules/log4j2/README.md

@@ -8,3 +8,4 @@
 - [System.out.println vs Loggers](https://www.baeldung.com/java-system-out-println-vs-loggers)
 - [Log4j 2 Plugins](https://www.baeldung.com/log4j2-plugins)
 - [Printing Thread Info in Log File Using Log4j2](https://www.baeldung.com/log4j2-print-thread-info)
+- [Log4j2 – Logging to Both File and Console](https://www.baeldung.com/java-log4j2-file-and-console)

logging-modules/log4j2/src/main/java/com/baeldung/logging/log4j2/consoleandfile/Log4j2ConsoleAndFile.java

@@ -0,0 +1,14 @@
+package com.baeldung.logging.log4j2.consoleandfile;
+
+import org.apache.logging.log4j.LogManager;
+import org.apache.logging.log4j.Logger;
+
+public class Log4j2ConsoleAndFile {
+
+    private static final Logger logger = LogManager.getLogger(Log4j2ConsoleAndFile.class);
+
+    public static void main(String[] args) {
+        logger.info("Hello World!");
+        logger.debug("Hello World!");
+    }
+}

logging-modules/log4j2/src/main/resources/log4j2.properties

@@ -0,0 +1,14 @@
+appender.console.type = Console
+appender.console.name = STDOUT
+appender.console.layout.type = PatternLayout
+appender.console.layout.pattern = [%-5level] %d{yyyy-MM-dd HH:mm:ss.SSS} [%t] %c{1} - %msg%n
+
+appender.file.type = File
+appender.file.name = LOGFILE
+appender.file.fileName=logs/log4j.log
+appender.file.layout.type=PatternLayout
+appender.file.layout.pattern=[%-5level] %d{yyyy-MM-dd HH:mm:ss.SSS} [%t] %c{1} - %msg%n
+appender.file.filter.threshold.type = ThresholdFilter
+appender.file.filter.threshold.level = info
+
+rootLogger=debug, STDOUT, LOGFILE

lombok-modules/pom.xml

@@ -32,8 +32,4 @@
         </pluginManagement>
     </build>
 
-    <properties>
-        <lombok.version>1.18.20</lombok.version>
-    </properties>
-
 </project>

maven-modules/maven-repositories/maven-download-artifacts/pom.xml

@@ -3,8 +3,8 @@
          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>maven-repository-download</artifactId>
-    <name>Maven Release Repository</name>
+    <artifactId>maven-download-artifacts</artifactId>
+    <name>maven-download-artifacts</name>
     <version>1.0.0-SNAPSHOT</version>
 
     <parent>

maven-modules/maven-repositories/maven-release-repository/pom.xml

@@ -4,7 +4,7 @@
     xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
     <modelVersion>4.0.0</modelVersion>
     <artifactId>maven-release-repository</artifactId>
-    <name>Maven Release Repository</name>
+    <name>maven-release-repository</name>
     <version>1.0.0</version>
 
     <parent>

maven-modules/maven-repositories/maven-snapshot-repository/pom.xml

@@ -4,7 +4,7 @@
          xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
     <modelVersion>4.0.0</modelVersion>
     <artifactId>maven-snapshot-repository</artifactId>
-    <name>Maven Snapshot Repository</name>
+    <name>maven-snapshot-repository</name>
     <version>1.0.0-SNAPSHOT</version>
 
     <parent>

maven-modules/maven-repositories/pom.xml

@@ -5,7 +5,7 @@
     <modelVersion>4.0.0</modelVersion>
     <artifactId>maven-repositories</artifactId>
     <version>1.0.0-SNAPSHOT</version>
-    <name>Maven Repositories</name>
+    <name>maven-repositories</name>
     <packaging>pom</packaging>
 
     <parent>