Merge branch 'eugenp:master' into master

apache-kafka/README.md

@@ -12,7 +12,8 @@ This module contains articles about Apache Kafka.
 - [Kafka Connect Example with MQTT and MongoDB](https://www.baeldung.com/kafka-connect-mqtt-mongodb)
 - [Building a Data Pipeline with Flink and Kafka](https://www.baeldung.com/kafka-flink-data-pipeline)
 - [Exactly Once Processing in Kafka with Java](https://www.baeldung.com/kafka-exactly-once)
+- [Custom Serializers in Apache Kafka](https://www.baeldung.com/kafka-custom-serializer)
 
 
 ##### Building the project
-You can build the project from the command line using: *mvn clean install*, or in an IDE.
+You can build the project from the command line using: *mvn clean install*, or in an IDE.

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

@@ -2,3 +2,4 @@
 
 - [String API Updates in Java 12](https://www.baeldung.com/java12-string-api)
 - [New Features in Java 12](https://www.baeldung.com/java-12-new-features)
+- [Compare the Content of Two Files in Java](https://www.baeldung.com/java-compare-files)

core-java-modules/core-java-16/src/main/java/com/baeldung/java_16_features/mapmulti/Album.java

@@ -0,0 +1,49 @@
+package com.baeldung.java_16_features.mapmulti;
+
+import java.util.List;
+import java.util.function.Consumer;
+import java.util.stream.Collectors;
+
+import org.apache.commons.lang3.tuple.ImmutablePair;
+import org.apache.commons.lang3.tuple.Pair;
+
+public class Album {
+
+    private String albumName;
+    private int albumCost;
+    private List<Artist> artists;
+
+    Album(String name, int albumCost, List<Artist> artists) {
+        this.albumName = name;
+        this.artists = artists;
+        this.albumCost = albumCost;
+    }
+
+    public void artistAlbumPairsToMajorLabels(Consumer<Pair<String, String>> consumer) {
+
+        for (Artist artist : artists) {
+            if (artist.isAssociatedMajorLabels()) {
+                String concatLabels = artist.getMajorLabels()
+                    .stream()
+                    .collect(Collectors.joining(","));
+                consumer.accept(new ImmutablePair<>(artist.getName() + ":" + albumName, concatLabels));
+            }
+        }
+    }
+
+    public String getAlbumName() {
+        return albumName;
+    }
+
+    public int getAlbumCost() {
+        return albumCost;
+    }
+
+    List<Artist> getArtists() {
+        return artists;
+    }
+
+    public String toString() {
+        return albumName;
+    }
+}

core-java-modules/core-java-16/src/main/java/com/baeldung/java_16_features/mapmulti/Artist.java

@@ -0,0 +1,50 @@
+package com.baeldung.java_16_features.mapmulti;
+
+import java.util.List;
+import java.util.Objects;
+
+public class Artist {
+
+    private final String name;
+    private boolean associatedMajorLabels;
+    private List<String> majorLabels;
+
+    Artist(String name, boolean associatedMajorLabels, List<String> majorLabels) {
+        this.name = name;
+        this.associatedMajorLabels = associatedMajorLabels;
+        this.majorLabels = majorLabels;
+    }
+
+    public String getName() {
+        return name;
+    }
+
+    public boolean isAssociatedMajorLabels() {
+        return associatedMajorLabels;
+    }
+
+    public List<String> getMajorLabels() {
+        return majorLabels;
+    }
+
+    @Override
+    public int hashCode() {
+        return Objects.hash(name);
+    }
+
+    @Override
+    public boolean equals(Object obj) {
+        if (this == obj)
+            return true;
+        if (obj == null)
+            return false;
+        if (getClass() != obj.getClass())
+            return false;
+        Artist other = (Artist) obj;
+        return Objects.equals(name, other.name);
+    }
+
+    public String toString() {
+        return name;
+    }
+}

core-java-modules/core-java-16/src/test/java/com/baeldung/java_16_features/mapmulti/JavaStreamMapMultiUnitTest.java

@@ -0,0 +1,134 @@
+package com.baeldung.java_16_features.mapmulti;
+
+import static java.util.stream.Collectors.toList;
+import static org.assertj.core.api.Assertions.assertThat;
+import static org.assertj.core.api.Assertions.offset;
+import static org.junit.jupiter.api.Assertions.assertTrue;
+
+import java.util.Arrays;
+import java.util.List;
+
+import org.apache.commons.lang3.tuple.ImmutablePair;
+import org.apache.commons.lang3.tuple.Pair;
+import org.junit.jupiter.api.Test;
+
+public class JavaStreamMapMultiUnitTest {
+
+    private static final List<Album> albums = Arrays.asList(new Album("album1", 10, Arrays.asList(new Artist("bob", true, Arrays.asList("label1", "label3")), new Artist("tom", true, Arrays.asList("label2", "label3")))),
+        new Album("album2", 20, Arrays.asList(new Artist("bill", true, Arrays.asList("label2", "label3")), new Artist("tom", true, Arrays.asList("label2", "label4")))));
+
+    @Test
+    public void givenAListOfintegers_whenMapMulti_thenGetListOfOfEvenDoublesPlusPercentage() {
+
+        List<Integer> integers = Arrays.asList(1, 2, 3, 4, 5);
+        double percentage = .01;
+        List<Double> evenDoubles = integers.stream()
+            .<Double> mapMulti((integer, consumer) -> {
+                if (integer % 2 == 0) {
+                    consumer.accept((double) integer * (1 + percentage));
+                }
+            })
+            .collect(toList());
+
+        assertThat(evenDoubles).containsAll(Arrays.asList(2.02D, 4.04D));
+    }
+
+    @Test
+    public void givenAListOfintegers_whenFilterMap_thenGetListOfOfEvenDoublesPlusPercentage() {
+
+        List<Integer> integers = Arrays.asList(1, 2, 3, 4, 5);
+        double percentage = .01;
+        List<Double> evenDoubles = integers.stream()
+            .filter(integer -> integer % 2 == 0)
+            .<Double> map(integer -> ((double) integer * (1 + percentage)))
+            .collect(toList());
+
+        assertThat(evenDoubles).containsAll(Arrays.asList(2.02D, 4.04D));
+    }
+
+    @Test
+    public void givenAListOfintegers_whenMapMultiToDouble_thenGetSumOfEvenNumbersAfterApplyPercentage() {
+
+        List<Integer> integers = Arrays.asList(1, 2, 3, 4, 5, 6, 7);
+        double percentage = .01;
+        double sum = integers.stream()
+            .mapMultiToDouble((integer, consumer) -> {
+                if (integer % 2 == 0) {
+                    consumer.accept(integer * (1 + percentage));
+                }
+            })
+            .sum();
+
+        assertThat(sum).isEqualTo(12.12, offset(0.001d));
+    }
+
+    @Test
+    public void givenAListOfAlbums_whenFlatMap_thenGetListOfArtistAlbumPairs() {
+
+        List<Pair<String, String>> artistAlbum = albums.stream()
+            .flatMap(album -> album.getArtists()
+                .stream()
+                .map(artist -> new ImmutablePair<String, String>(artist.getName(), album.getAlbumName())))
+            .collect(toList());
+
+        assertThat(artistAlbum).contains(new ImmutablePair<String, String>("bob", "album1"), new ImmutablePair<String, 
+            String>("tom", "album1"), new ImmutablePair<String, String>("bill", "album2"), new ImmutablePair<String, String>("tom", "album2"));
+    }
+
+    @Test
+    public void givenAListOfAlbums_whenMapMulti_thenGetListOfPairsOfArtistAlbum() {
+
+        List<Pair<String, String>> artistAlbum = albums.stream()
+            .<Pair<String, String>> mapMulti((album, consumer) -> {
+                for (Artist artist : album.getArtists()) {
+                    consumer.accept(new ImmutablePair<String, String>(artist.getName(), album.getAlbumName()));
+                }
+            })
+            .collect(toList());
+
+        assertThat(artistAlbum).contains(new ImmutablePair<String, String>("bob", "album1"), new ImmutablePair<String, String>("tom", "album1"), 
+            new ImmutablePair<String, String>("bill", "album2"), new ImmutablePair<String, String>("tom", "album2"));
+    }
+
+    @Test
+    public void givenAListOfAlbums_whenFlatMap_thenGetListOfArtistAlbumjPairsBelowGivenCost() {
+
+        int upperCost = 9;
+        List<Pair<String, String>> artistAlbum = albums.stream()
+            .flatMap(album -> album.getArtists()
+                .stream()
+                .filter(artist -> upperCost > album.getAlbumCost())
+                .map(artist -> new ImmutablePair<String, String>(artist.getName(), album.getAlbumName())))
+            .collect(toList());
+
+        assertTrue(artistAlbum.isEmpty());
+    }
+
+    @Test
+    public void givenAListOfAlbums_whenMapMulti_thenGetListOfArtistAlbumPairsBelowGivenCost() {
+
+        int upperCost = 9;
+        List<Pair<String, String>> artistAlbum = albums.stream()
+            .<Pair<String, String>> mapMulti((album, consumer) -> {
+                if (album.getAlbumCost() < upperCost) {
+                    for (Artist artist : album.getArtists()) {
+                        consumer.accept(new ImmutablePair<String, String>(artist.getName(), album.getAlbumName()));
+                    }
+                }
+            })
+            .collect(toList());
+
+        assertTrue(artistAlbum.isEmpty());
+    }
+
+    @Test
+    public void givenAListOfAlbums_whenMapMulti_thenGetPairsOfArtistMajorLabelsUsingMethodReference() {
+
+        List<Pair<String, String>> artistLabels = albums.stream()
+            .mapMulti(Album::artistAlbumPairsToMajorLabels)
+            .collect(toList());
+
+        assertThat(artistLabels).contains(new ImmutablePair<String, String>("bob:album1", "label1,label3"), new ImmutablePair<String, String>("tom:album1", "label2,label3"), 
+            new ImmutablePair<String, String>("bill:album2", "label2,label3"), new ImmutablePair<String, String>("tom:album2", "label2,label4"));
+    }
+}

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

@@ -11,3 +11,4 @@ This module contains articles about parsing and formatting Java date and time ob
 - [Display All Time Zones With GMT And UTC in Java](http://www.baeldung.com/java-time-zones)
 - [Convert between String and Timestamp](https://www.baeldung.com/java-string-to-timestamp)
 - [Convert String to Date in Java](http://www.baeldung.com/java-string-to-date)
+- [Format a Milliseconds Duration to HH:MM:SS](https://www.baeldung.com/java-ms-to-hhmmss)

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

@@ -75,7 +75,7 @@
 
     <properties>
         <commons-validator.version>1.6</commons-validator.version>
-        <joda-time.version>2.10</joda-time.version>
+        <joda-time.version>2.10.10</joda-time.version>
         <!-- testing -->
         <assertj.version>3.6.1</assertj.version>
         <maven.compiler.source>1.9</maven.compiler.source>

core-java-modules/core-java-datetime-string/src/test/java/com/baeldung/formatduration/FormatDurationUnitTest.java

@@ -0,0 +1,54 @@
+package com.baeldung.formatduration;
+
+import org.apache.commons.lang3.time.DurationFormatUtils;
+import org.joda.time.Period;
+import org.junit.Test;
+
+import java.time.Duration;
+import java.util.concurrent.TimeUnit;
+
+import static org.assertj.core.api.Assertions.assertThat;
+
+public class FormatDurationUnitTest {
+
+
+    @Test
+    public void givenInterval_WhenFormatInterval_formatDuration() {
+        long HH = TimeUnit.MILLISECONDS.toHours(38114000);
+        long MM = TimeUnit.MILLISECONDS.toMinutes(38114000) % 60;
+        long SS = TimeUnit.MILLISECONDS.toSeconds(38114000) % 60;
+        String timeInHHMMSS = String.format("%02d:%02d:%02d", HH, MM, SS);
+
+        assertThat(timeInHHMMSS).isEqualTo("10:35:14");
+    }
+
+    @Test
+    public void givenInterval_WhenFormatUsingDuration_formatDuration() {
+        Duration duration = Duration.ofMillis(38114000);
+        long seconds = duration.getSeconds();
+        long HH = seconds / 3600;
+        long MM = (seconds % 3600) / 60;
+        long SS = seconds % 60;
+        String timeInHHMMSS =  String.format("%02d:%02d:%02d", HH, MM, SS);
+        assertThat(timeInHHMMSS).isEqualTo("10:35:14");
+    }
+
+
+    @Test
+    public void givenInterval_WhenFormatDurationUsingApacheCommons_formatDuration() {
+        assertThat(DurationFormatUtils.formatDuration(38114000, "HH:mm:ss"))
+          .isEqualTo("10:35:14");
+    }
+
+    @Test
+    public void givenInterval_WhenFormatDurationUsingJodaTime_formatDuration() {
+        org.joda.time.Duration duration = new org.joda.time.Duration(38114000);
+        Period period = duration.toPeriod();
+        long HH = period.getHours();
+        long MM = period.getMinutes();
+        long SS = period.getSeconds();
+
+        String timeInHHMMSS = String.format("%02d:%02d:%02d", HH, MM, SS);
+        assertThat(timeInHHMMSS).isEqualTo("10:35:14");
+    }
+}

javafx/README.md

@@ -3,5 +3,6 @@
 This module contains articles about JavaFX.
 
 ### Relevant Articles:
--[Introduction to JavaFX](https://www.baeldung.com/javafx)
+- [Introduction to JavaFX](https://www.baeldung.com/javafx)
+- [Display Custom Items in JavaFX ListView](https://www.baeldung.com/javafx-listview-display-custom-items)
 

jhipster/jhipster-microservice/car-app/pom.xml

@@ -17,7 +17,6 @@
     </prerequisites>
 
     <properties>
-        <lifecycle.mapping.version>1.0.0</lifecycle.mapping.version>
         <argLine>-Djava.security.egd=file:/dev/./urandom -Xmx256m</argLine>
         <assertj.version>3.6.2</assertj.version>
         <awaitility.version>2.0.0</awaitility.version>
@@ -31,6 +30,7 @@
         <jcache.version>1.0.0</jcache.version>
         <jhipster.server.version>1.1.0</jhipster.server.version>
         <jjwt.version>0.7.0</jjwt.version>
+        <lifecycle.mapping.version>1.0.0</lifecycle.mapping.version>
         <liquibase-hibernate5.version>3.6</liquibase-hibernate5.version>
         <liquibase-slf4j.version>2.0.0</liquibase-slf4j.version>
         <liquibase.version>3.6.2</liquibase.version>
@@ -59,14 +59,14 @@
 
         <sonar.issue.ignore.multicriteria>S3437,UndocumentedApi,BoldAndItalicTagsCheck</sonar.issue.ignore.multicriteria>
 
-        <!-- Rule https://sonarqube.com/coding_rules#rule_key=Web%3ABoldAndItalicTagsCheck is ignored. Even if we agree that using the "i" tag is an awful practice, this is what is 
+        <!-- Rule https://sonarqube.com/coding_rules#rule_key=Web%3ABoldAndItalicTagsCheck is ignored. Even if we agree that using the "i" tag is an awful practice, this is what is
             recommended by http://fontawesome.io/examples/ -->
         <sonar.issue.ignore.multicriteria.BoldAndItalicTagsCheck.resourceKey>src/main/webapp/app/**/*.*</sonar.issue.ignore.multicriteria.BoldAndItalicTagsCheck.resourceKey>
         <sonar.issue.ignore.multicriteria.BoldAndItalicTagsCheck.ruleKey>Web:BoldAndItalicTagsCheck</sonar.issue.ignore.multicriteria.BoldAndItalicTagsCheck.ruleKey>
         <!-- Rule https://sonarqube.com/coding_rules#rule_key=squid%3AS3437 is ignored, as a JPA-managed field cannot be transient -->
         <sonar.issue.ignore.multicriteria.S3437.resourceKey>src/main/java/**/*</sonar.issue.ignore.multicriteria.S3437.resourceKey>
         <sonar.issue.ignore.multicriteria.S3437.ruleKey>squid:S3437</sonar.issue.ignore.multicriteria.S3437.ruleKey>
-        <!-- Rule http://sonarqube.com/coding_rules#rule_key=squid%3AUndocumentedApi is ignored, as we want to follow "clean code" guidelines and classes, methods and arguments names 
+        <!-- Rule http://sonarqube.com/coding_rules#rule_key=squid%3AUndocumentedApi is ignored, as we want to follow "clean code" guidelines and classes, methods and arguments names
             should be self-explanatory -->
         <sonar.issue.ignore.multicriteria.UndocumentedApi.resourceKey>src/main/java/**/*</sonar.issue.ignore.multicriteria.UndocumentedApi.resourceKey>
         <sonar.issue.ignore.multicriteria.UndocumentedApi.ruleKey>squid:UndocumentedApi</sonar.issue.ignore.multicriteria.UndocumentedApi.ruleKey>
@@ -349,7 +349,6 @@
         <dependency>
             <groupId>org.springframework.boot</groupId>
             <artifactId>spring-boot-starter-test</artifactId>
-            <scope>test</scope>
         </dependency>
         <dependency>
             <groupId>org.springframework.boot</groupId>
@@ -365,11 +364,6 @@
                 </exclusion>
             </exclusions>
         </dependency>
-        <dependency>
-            <groupId>org.springframework.boot</groupId>
-            <artifactId>spring-boot-test</artifactId>
-            <scope>test</scope>
-        </dependency>
         <!-- Spring Cloud -->
         <dependency>
             <groupId>org.springframework.cloud</groupId>
@@ -427,7 +421,7 @@
         <defaultGoal>spring-boot:run</defaultGoal>
         <pluginManagement>
             <plugins>
-                <!-- This plugin's configuration is used to store Eclipse m2e settings only. It has no influence on the Maven build itself. Remove when the m2e plugin can correctly 
+                <!-- This plugin's configuration is used to store Eclipse m2e settings only. It has no influence on the Maven build itself. Remove when the m2e plugin can correctly
                     bind to Maven lifecycle -->
                 <plugin>
                     <groupId>org.eclipse.m2e</groupId>
@@ -580,14 +574,6 @@
                     </execution>
                 </executions>
             </plugin>
-            <plugin>
-                <groupId>org.apache.maven.plugins</groupId>
-                <artifactId>maven-surefire-plugin</artifactId>
-                <configuration>
-                    <!-- Force alphabetical order to have a reproducible build -->
-                    <runOrder>alphabetical</runOrder>
-                </configuration>
-            </plugin>
             <plugin>
                 <groupId>org.jacoco</groupId>
                 <artifactId>jacoco-maven-plugin</artifactId>
@@ -768,8 +754,8 @@
             </dependencies>
         </profile>
         <profile>
-            <!-- Profile for doing "continuous compilation" with the Scala Maven plugin. It allows automatic compilation of Java classes as soon as they are saved. To use it, run in 
-                3 terminals: - './mvnw -Pcc scala:cc' for continous compilation of your classes - './mvnw -Pcc' for hot reload of Spring boot - 'gulp' for hot reload of the HTML/JavaScript assets Everything 
+            <!-- Profile for doing "continuous compilation" with the Scala Maven plugin. It allows automatic compilation of Java classes as soon as they are saved. To use it, run in
+                3 terminals: - './mvnw -Pcc scala:cc' for continous compilation of your classes - './mvnw -Pcc' for hot reload of Spring boot - 'gulp' for hot reload of the HTML/JavaScript assets Everything
                 should hot reload automatically! -->
             <id>cc</id>
             <build>

jhipster/jhipster-microservice/car-app/src/test/resources/config/application.yml

@@ -21,6 +21,8 @@ eureka:
         instanceId: carapp:${spring.application.instance_id:${random.value}}
 
 spring:
+    main:
+        banner-mode: "off"
     application:
         name: carapp
     jackson:
@@ -37,7 +39,7 @@ spring:
         database-platform: io.github.jhipster.domain.util.FixedH2Dialect
         database: H2
         open-in-view: false
-        show-sql: true
+        show-sql: false
         hibernate:
             ddl-auto: none
             naming:

jhipster/jhipster-microservice/car-app/src/test/resources/logback-test.xml

@@ -3,7 +3,7 @@
 <configuration scan="true">
     <include resource="org/springframework/boot/logging/logback/base.xml"/>
 
-    <logger name="com.car.app" level="DEBUG"/>
+    <logger name="com.car.app" level="INFO"/>
     <logger name="org.hibernate" level="WARN"/>
     <logger name="org.hibernate.ejb.HibernatePersistence" level="OFF"/>
     <logger name="org.apache.catalina.startup.DigesterFactory" level="OFF"/>

jhipster/jhipster-microservice/dealer-app/pom.xml

@@ -29,6 +29,7 @@
         <jcache.version>1.0.0</jcache.version>
         <jhipster.server.version>1.1.0</jhipster.server.version>
         <jjwt.version>0.7.0</jjwt.version>
+        <lifecycle.mapping.version>1.0.0</lifecycle.mapping.version>
         <liquibase-hibernate5.version>3.6</liquibase-hibernate5.version>
         <liquibase-slf4j.version>2.0.0</liquibase-slf4j.version>
         <liquibase.version>3.6.2</liquibase.version>
@@ -57,14 +58,14 @@
 
         <sonar.issue.ignore.multicriteria>S3437,UndocumentedApi,BoldAndItalicTagsCheck</sonar.issue.ignore.multicriteria>
 
-        <!-- Rule https://sonarqube.com/coding_rules#rule_key=Web%3ABoldAndItalicTagsCheck is ignored. Even if we agree that using the "i" tag is an awful practice, this is what is 
+        <!-- Rule https://sonarqube.com/coding_rules#rule_key=Web%3ABoldAndItalicTagsCheck is ignored. Even if we agree that using the "i" tag is an awful practice, this is what is
             recommended by http://fontawesome.io/examples/ -->
         <sonar.issue.ignore.multicriteria.BoldAndItalicTagsCheck.resourceKey>src/main/webapp/app/**/*.*</sonar.issue.ignore.multicriteria.BoldAndItalicTagsCheck.resourceKey>
         <sonar.issue.ignore.multicriteria.BoldAndItalicTagsCheck.ruleKey>Web:BoldAndItalicTagsCheck</sonar.issue.ignore.multicriteria.BoldAndItalicTagsCheck.ruleKey>
         <!-- Rule https://sonarqube.com/coding_rules#rule_key=squid%3AS3437 is ignored, as a JPA-managed field cannot be transient -->
         <sonar.issue.ignore.multicriteria.S3437.resourceKey>src/main/java/**/*</sonar.issue.ignore.multicriteria.S3437.resourceKey>
         <sonar.issue.ignore.multicriteria.S3437.ruleKey>squid:S3437</sonar.issue.ignore.multicriteria.S3437.ruleKey>
-        <!-- Rule http://sonarqube.com/coding_rules#rule_key=squid%3AUndocumentedApi is ignored, as we want to follow "clean code" guidelines and classes, methods and arguments names 
+        <!-- Rule http://sonarqube.com/coding_rules#rule_key=squid%3AUndocumentedApi is ignored, as we want to follow "clean code" guidelines and classes, methods and arguments names
             should be self-explanatory -->
         <sonar.issue.ignore.multicriteria.UndocumentedApi.resourceKey>src/main/java/**/*</sonar.issue.ignore.multicriteria.UndocumentedApi.resourceKey>
         <sonar.issue.ignore.multicriteria.UndocumentedApi.ruleKey>squid:UndocumentedApi</sonar.issue.ignore.multicriteria.UndocumentedApi.ruleKey>
@@ -90,7 +91,6 @@
         <undertow.version>1.4.10.Final</undertow.version>
         <validation-api.version>1.1.0.Final</validation-api.version>
         <yarn.version>v0.21.3</yarn.version>
-        <lifecycle.mapping.version>1.0.0</lifecycle.mapping.version>
     </properties>
 
     <dependencyManagement>
@@ -345,6 +345,10 @@
             <groupId>org.springframework.boot</groupId>
             <artifactId>spring-boot-starter-security</artifactId>
         </dependency>
+        <dependency>
+            <groupId>org.springframework.boot</groupId>
+            <artifactId>spring-boot-starter-test</artifactId>
+        </dependency>
         <dependency>
             <groupId>org.springframework.boot</groupId>
             <artifactId>spring-boot-starter-thymeleaf</artifactId>
@@ -359,11 +363,6 @@
                 </exclusion>
             </exclusions>
         </dependency>
-        <dependency>
-            <groupId>org.springframework.boot</groupId>
-            <artifactId>spring-boot-test</artifactId>
-            <scope>test</scope>
-        </dependency>
         <!-- Spring Cloud -->
         <dependency>
             <groupId>org.springframework.cloud</groupId>
@@ -421,7 +420,7 @@
         <defaultGoal>spring-boot:run</defaultGoal>
         <pluginManagement>
             <plugins>
-                <!-- This plugin's configuration is used to store Eclipse m2e settings only. It has no influence on the Maven build itself. Remove when the m2e plugin can correctly 
+                <!-- This plugin's configuration is used to store Eclipse m2e settings only. It has no influence on the Maven build itself. Remove when the m2e plugin can correctly
                     bind to Maven lifecycle -->
                 <plugin>
                     <groupId>org.eclipse.m2e</groupId>
@@ -574,14 +573,6 @@
                     </execution>
                 </executions>
             </plugin>
-            <plugin>
-                <groupId>org.apache.maven.plugins</groupId>
-                <artifactId>maven-surefire-plugin</artifactId>
-                <configuration>
-                    <!-- Force alphabetical order to have a reproducible build -->
-                    <runOrder>alphabetical</runOrder>
-                </configuration>
-            </plugin>
             <plugin>
                 <groupId>org.jacoco</groupId>
                 <artifactId>jacoco-maven-plugin</artifactId>
@@ -762,8 +753,8 @@
             </dependencies>
         </profile>
         <profile>
-            <!-- Profile for doing "continuous compilation" with the Scala Maven plugin. It allows automatic compilation of Java classes as soon as they are saved. To use it, run in 
-                3 terminals: - './mvnw -Pcc scala:cc' for continous compilation of your classes - './mvnw -Pcc' for hot reload of Spring boot - 'gulp' for hot reload of the HTML/JavaScript assets Everything 
+            <!-- Profile for doing "continuous compilation" with the Scala Maven plugin. It allows automatic compilation of Java classes as soon as they are saved. To use it, run in
+                3 terminals: - './mvnw -Pcc scala:cc' for continous compilation of your classes - './mvnw -Pcc' for hot reload of Spring boot - 'gulp' for hot reload of the HTML/JavaScript assets Everything
                 should hot reload automatically! -->
             <id>cc</id>
             <build>

jhipster/jhipster-microservice/dealer-app/src/test/resources/config/application.yml

@@ -21,6 +21,8 @@ eureka:
         instanceId: dealerapp:${spring.application.instance_id:${random.value}}
 
 spring:
+    main:
+        banner-mode: "off"
     application:
         name: dealerapp
     jackson:
@@ -37,7 +39,7 @@ spring:
         database-platform: io.github.jhipster.domain.util.FixedH2Dialect
         database: H2
         open-in-view: false
-        show-sql: true
+        show-sql: false
         hibernate:
             ddl-auto: none
             naming:

jhipster/jhipster-microservice/dealer-app/src/test/resources/logback-test.xml

@@ -3,7 +3,7 @@
 <configuration scan="true">
     <include resource="org/springframework/boot/logging/logback/base.xml"/>
 
-    <logger name="com.dealer.app" level="DEBUG"/>
+    <logger name="com.dealer.app" level="INFO"/>
     <logger name="org.hibernate" level="WARN"/>
     <logger name="org.hibernate.ejb.HibernatePersistence" level="OFF"/>
     <logger name="org.apache.catalina.startup.DigesterFactory" level="OFF"/>

jhipster/jhipster-microservice/gateway-app/pom.xml

@@ -32,6 +32,7 @@
         <jcache.version>1.0.0</jcache.version>
         <jhipster.server.version>1.1.0</jhipster.server.version>
         <jjwt.version>0.7.0</jjwt.version>
+        <lifecycle.mapping.version>1.0.0</lifecycle.mapping.version>
         <liquibase-hibernate5.version>3.6</liquibase-hibernate5.version>
         <liquibase-slf4j.version>2.0.0</liquibase-slf4j.version>
         <liquibase.version>3.6.2</liquibase.version>
@@ -61,14 +62,14 @@
 
         <sonar.issue.ignore.multicriteria>S3437,UndocumentedApi,BoldAndItalicTagsCheck</sonar.issue.ignore.multicriteria>
 
-        <!-- Rule https://sonarqube.com/coding_rules#rule_key=Web%3ABoldAndItalicTagsCheck is ignored. Even if we agree that using the "i" tag is an awful practice, this is what is 
+        <!-- Rule https://sonarqube.com/coding_rules#rule_key=Web%3ABoldAndItalicTagsCheck is ignored. Even if we agree that using the "i" tag is an awful practice, this is what is
             recommended by http://fontawesome.io/examples/ -->
         <sonar.issue.ignore.multicriteria.BoldAndItalicTagsCheck.resourceKey>src/main/webapp/app/**/*.*</sonar.issue.ignore.multicriteria.BoldAndItalicTagsCheck.resourceKey>
         <sonar.issue.ignore.multicriteria.BoldAndItalicTagsCheck.ruleKey>Web:BoldAndItalicTagsCheck</sonar.issue.ignore.multicriteria.BoldAndItalicTagsCheck.ruleKey>
         <!-- Rule https://sonarqube.com/coding_rules#rule_key=squid%3AS3437 is ignored, as a JPA-managed field cannot be transient -->
         <sonar.issue.ignore.multicriteria.S3437.resourceKey>src/main/java/**/*</sonar.issue.ignore.multicriteria.S3437.resourceKey>
         <sonar.issue.ignore.multicriteria.S3437.ruleKey>squid:S3437</sonar.issue.ignore.multicriteria.S3437.ruleKey>
-        <!-- Rule http://sonarqube.com/coding_rules#rule_key=squid%3AUndocumentedApi is ignored, as we want to follow "clean code" guidelines and classes, methods and arguments names 
+        <!-- Rule http://sonarqube.com/coding_rules#rule_key=squid%3AUndocumentedApi is ignored, as we want to follow "clean code" guidelines and classes, methods and arguments names
             should be self-explanatory -->
         <sonar.issue.ignore.multicriteria.UndocumentedApi.resourceKey>src/main/java/**/*</sonar.issue.ignore.multicriteria.UndocumentedApi.resourceKey>
         <sonar.issue.ignore.multicriteria.UndocumentedApi.ruleKey>squid:UndocumentedApi</sonar.issue.ignore.multicriteria.UndocumentedApi.ruleKey>
@@ -94,7 +95,6 @@
         <undertow.version>1.4.10.Final</undertow.version>
         <validation-api.version>1.1.0.Final</validation-api.version>
         <yarn.version>v0.21.3</yarn.version>
-        <lifecycle.mapping.version>1.0.0</lifecycle.mapping.version>
     </properties>
 
     <dependencyManagement>
@@ -383,6 +383,10 @@
             <artifactId>spring-boot-starter-test</artifactId>
             <scope>test</scope>
         </dependency>
+        <dependency>
+            <groupId>org.springframework.boot</groupId>
+            <artifactId>spring-boot-starter-test</artifactId>
+        </dependency>
         <dependency>
             <groupId>org.springframework.boot</groupId>
             <artifactId>spring-boot-starter-thymeleaf</artifactId>
@@ -397,11 +401,6 @@
                 </exclusion>
             </exclusions>
         </dependency>
-        <dependency>
-            <groupId>org.springframework.boot</groupId>
-            <artifactId>spring-boot-test</artifactId>
-            <scope>test</scope>
-        </dependency>
         <dependency>
             <groupId>org.springframework.cloud</groupId>
             <artifactId>spring-cloud-starter</artifactId>
@@ -463,7 +462,7 @@
         <defaultGoal>spring-boot:run</defaultGoal>
         <pluginManagement>
             <plugins>
-                <!-- This plugin's configuration is used to store Eclipse m2e settings only. It has no influence on the Maven build itself. Remove when the m2e plugin can correctly 
+                <!-- This plugin's configuration is used to store Eclipse m2e settings only. It has no influence on the Maven build itself. Remove when the m2e plugin can correctly
                     bind to Maven lifecycle -->
                 <plugin>
                     <groupId>org.eclipse.m2e</groupId>
@@ -632,14 +631,6 @@
                     </execution>
                 </executions>
             </plugin>
-            <plugin>
-                <groupId>org.apache.maven.plugins</groupId>
-                <artifactId>maven-surefire-plugin</artifactId>
-                <configuration>
-                    <!-- Force alphabetical order to have a reproducible build -->
-                    <runOrder>alphabetical</runOrder>
-                </configuration>
-            </plugin>
             <plugin>
                 <groupId>org.jacoco</groupId>
                 <artifactId>jacoco-maven-plugin</artifactId>
@@ -878,8 +869,8 @@
             </dependencies>
         </profile>
         <profile>
-            <!-- Profile for doing "continuous compilation" with the Scala Maven plugin. It allows automatic compilation of Java classes as soon as they are saved. To use it, run in 
-                3 terminals: - './mvnw -Pcc scala:cc' for continous compilation of your classes - './mvnw -Pcc' for hot reload of Spring boot - 'gulp' for hot reload of the HTML/JavaScript assets Everything 
+            <!-- Profile for doing "continuous compilation" with the Scala Maven plugin. It allows automatic compilation of Java classes as soon as they are saved. To use it, run in
+                3 terminals: - './mvnw -Pcc scala:cc' for continous compilation of your classes - './mvnw -Pcc' for hot reload of Spring boot - 'gulp' for hot reload of the HTML/JavaScript assets Everything
                 should hot reload automatically! -->
             <id>cc</id>
             <build>

jhipster/jhipster-microservice/gateway-app/src/test/java/com/gateway/web/rest/LogsResourceIntegrationTest.java

@@ -49,7 +49,7 @@ public class LogsResourceIntegrationTest {
     public void changeLogs()throws Exception {
         LoggerVM logger = new LoggerVM();
         logger.setLevel("INFO");
-        logger.setName("ROOT");
+        logger.setName("some.test.logger");
 
         restLogsMockMvc.perform(put("/management/logs")
             .contentType(TestUtil.APPLICATION_JSON_UTF8)

jhipster/jhipster-microservice/gateway-app/src/test/resources/config/application.yml

@@ -21,6 +21,8 @@ eureka:
         instanceId: gateway:${spring.application.instance_id:${random.value}}
 
 spring:
+    main:
+        banner-mode: "off"
     application:
         name: gateway
     autoconfigure:
@@ -39,7 +41,7 @@ spring:
         database-platform: io.github.jhipster.domain.util.FixedH2Dialect
         database: H2
         open-in-view: false
-        show-sql: true
+        show-sql: false
         hibernate:
             ddl-auto: none
             naming:

jhipster/jhipster-microservice/gateway-app/src/test/resources/logback-test.xml

@@ -3,7 +3,7 @@
 <configuration scan="true">
     <include resource="org/springframework/boot/logging/logback/base.xml"/>
 
-    <logger name="com.gateway" level="DEBUG"/>
+    <logger name="com.gateway" level="INFO"/>
     <logger name="org.hibernate" level="WARN"/>
     <logger name="org.hibernate.ejb.HibernatePersistence" level="OFF"/>
     <logger name="org.apache.catalina.startup.DigesterFactory" level="OFF"/>

jhipster/jhipster-microservice/pom.xml

@@ -11,7 +11,7 @@
         <groupId>com.baeldung.jhipster</groupId>
         <version>1.0.0-SNAPSHOT</version>
     </parent>
-    
+
     <modules>
         <module>car-app</module>
         <module>dealer-app</module>

jhipster/jhipster-monolithic/pom.xml

@@ -277,8 +277,7 @@
         </dependency>
         <dependency>
             <groupId>org.springframework.boot</groupId>
-            <artifactId>spring-boot-test</artifactId>
-            <scope>test</scope>
+            <artifactId>spring-boot-starter-test</artifactId>
         </dependency>
         <!-- security -->
         <dependency>
@@ -297,7 +296,7 @@
         <defaultGoal>spring-boot:run</defaultGoal>
         <pluginManagement>
             <plugins>
-                <!-- This plugin's configuration is used to store Eclipse m2e settings only. It has no influence on the Maven build itself. Remove when the m2e plugin can correctly 
+                <!-- This plugin's configuration is used to store Eclipse m2e settings only. It has no influence on the Maven build itself. Remove when the m2e plugin can correctly
                     bind to Maven lifecycle -->
                 <plugin>
                     <groupId>org.eclipse.m2e</groupId>
@@ -751,8 +750,8 @@
             </dependencies>
         </profile>
         <profile>
-            <!-- Profile for doing "continuous compilation" with the Scala Maven plugin. It allows automatic compilation of Java classes as soon as they are saved. To use it, run in 
-                3 terminals: - './mvnw -Pcc scala:cc' for continous compilation of your classes - './mvnw -Pcc' for hot reload of Spring boot - 'gulp' for hot reload of the HTML/JavaScript assets Everything 
+            <!-- Profile for doing "continuous compilation" with the Scala Maven plugin. It allows automatic compilation of Java classes as soon as they are saved. To use it, run in
+                3 terminals: - './mvnw -Pcc scala:cc' for continous compilation of your classes - './mvnw -Pcc' for hot reload of Spring boot - 'gulp' for hot reload of the HTML/JavaScript assets Everything
                 should hot reload automatically! -->
             <id>cc</id>
             <build>
@@ -931,14 +930,14 @@
 
         <sonar.issue.ignore.multicriteria>S3437,UndocumentedApi,BoldAndItalicTagsCheck</sonar.issue.ignore.multicriteria>
 
-        <!-- Rule https://sonarqube.com/coding_rules#rule_key=Web%3ABoldAndItalicTagsCheck is ignored. Even if we agree that using the "i" tag is an awful practice, this is what is 
+        <!-- Rule https://sonarqube.com/coding_rules#rule_key=Web%3ABoldAndItalicTagsCheck is ignored. Even if we agree that using the "i" tag is an awful practice, this is what is
             recommended by http://fontawesome.io/examples/ -->
         <sonar.issue.ignore.multicriteria.BoldAndItalicTagsCheck.resourceKey>src/main/webapp/app/**/*.*</sonar.issue.ignore.multicriteria.BoldAndItalicTagsCheck.resourceKey>
         <sonar.issue.ignore.multicriteria.BoldAndItalicTagsCheck.ruleKey>Web:BoldAndItalicTagsCheck</sonar.issue.ignore.multicriteria.BoldAndItalicTagsCheck.ruleKey>
         <!-- Rule https://sonarqube.com/coding_rules#rule_key=squid%3AS3437 is ignored, as a JPA-managed field cannot be transient -->
         <sonar.issue.ignore.multicriteria.S3437.resourceKey>src/main/java/**/*</sonar.issue.ignore.multicriteria.S3437.resourceKey>
         <sonar.issue.ignore.multicriteria.S3437.ruleKey>squid:S3437</sonar.issue.ignore.multicriteria.S3437.ruleKey>
-        <!-- Rule http://sonarqube.com/coding_rules#rule_key=squid%3AUndocumentedApi is ignored, as we want to follow "clean code" guidelines and classes, methods and arguments names 
+        <!-- Rule http://sonarqube.com/coding_rules#rule_key=squid%3AUndocumentedApi is ignored, as we want to follow "clean code" guidelines and classes, methods and arguments names
             should be self-explanatory -->
         <sonar.issue.ignore.multicriteria.UndocumentedApi.resourceKey>src/main/java/**/*</sonar.issue.ignore.multicriteria.UndocumentedApi.resourceKey>
         <sonar.issue.ignore.multicriteria.UndocumentedApi.ruleKey>squid:UndocumentedApi</sonar.issue.ignore.multicriteria.UndocumentedApi.ruleKey>

jhipster/jhipster-monolithic/src/test/java/com/baeldung/web/rest/LogsResourceIntegrationTest.java

@@ -49,7 +49,7 @@ public class LogsResourceIntegrationTest {
     public void changeLogs()throws Exception {
         LoggerVM logger = new LoggerVM();
         logger.setLevel("INFO");
-        logger.setName("ROOT");
+        logger.setName("some.test.logger");
 
         restLogsMockMvc.perform(put("/management/logs")
             .contentType(TestUtil.APPLICATION_JSON_UTF8)

jhipster/jhipster-monolithic/src/test/resources/config/application.yml

@@ -15,6 +15,8 @@
 
 
 spring:
+    main:
+        banner-mode: "off"
     application:
         name: baeldung
     jackson:
@@ -31,7 +33,7 @@ spring:
         database-platform: io.github.jhipster.domain.util.FixedH2Dialect
         database: H2
         open-in-view: false
-        show-sql: true
+        show-sql: false
         hibernate:
             ddl-auto: none
             naming:

jhipster/jhipster-monolithic/src/test/resources/logback-test.xml

@@ -3,7 +3,7 @@
 <configuration scan="true">
     <include resource="org/springframework/boot/logging/logback/base.xml"/>
 
-    <logger name="com.baeldung" level="DEBUG"/>
+    <logger name="com.baeldung" level="INFO"/>
     <logger name="org.hibernate" level="WARN"/>
     <logger name="org.hibernate.ejb.HibernatePersistence" level="OFF"/>
     <logger name="org.apache.catalina.startup.DigesterFactory" level="OFF"/>

jhipster/jhipster-uaa/gateway/pom.xml

@@ -1,6 +1,13 @@
 <?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/maven-v4_0_0.xsd">
     <modelVersion>4.0.0</modelVersion>
+
+    <parent>
+        <artifactId>jhipster-uaa</artifactId>
+        <groupId>com.baeldung.jhipster</groupId>
+        <version>1.0.0-SNAPSHOT</version>
+    </parent>
+
     <groupId>com.baeldung.jhipster.gateway</groupId>
     <artifactId>gateway</artifactId>
     <version>0.0.1-SNAPSHOT</version>
@@ -415,15 +422,6 @@
                     </execution>
                 </executions>
             </plugin>
-            <plugin>
-                <groupId>org.apache.maven.plugins</groupId>
-                <artifactId>maven-surefire-plugin</artifactId>
-                <version>${maven-surefire-plugin.version}</version>
-                <configuration>
-                    <!-- Force alphabetical order to have a reproducible build -->
-                    <runOrder>alphabetical</runOrder>
-                </configuration>
-            </plugin>
             <plugin>
                 <groupId>org.jacoco</groupId>
                 <artifactId>jacoco-maven-plugin</artifactId>
@@ -1010,7 +1008,7 @@
         </profile>
         <!-- jhipster-needle-maven-add-profile -->
     </profiles>
-	
+
     <properties>
         <lifecycle.mapping.version>1.0.0</lifecycle.mapping.version>
         <spring.web.version>0.24.0</spring.web.version>
@@ -1090,5 +1088,5 @@
         <sonar.tests>${project.basedir}/src/test/</sonar.tests>
 
         <!-- jhipster-needle-maven-property -->
-    </properties>	
+    </properties>
 </project>

jhipster/jhipster-uaa/gateway/src/test/java/com/baeldung/jhipster/gateway/config/WebConfigurerUnitTest.java

@@ -40,7 +40,7 @@ import static org.springframework.test.web.servlet.result.MockMvcResultMatchers.
  *
  * @see WebConfigurer
  */
-public class WebConfigurerTest {
+public class WebConfigurerUnitTest {
 
     private WebConfigurer webConfigurer;
 

jhipster/jhipster-uaa/gateway/src/test/java/com/baeldung/jhipster/gateway/gateway/responserewriting/SwaggerBasePathRewritingFilterUnitTest.java

@@ -18,7 +18,7 @@ import static springfox.documentation.swagger2.web.Swagger2Controller.DEFAULT_UR
 /**
  * Tests SwaggerBasePathRewritingFilter class.
  */
-public class SwaggerBasePathRewritingFilterTest {
+public class SwaggerBasePathRewritingFilterUnitTest {
 
     private SwaggerBasePathRewritingFilter filter = new SwaggerBasePathRewritingFilter();
 

jhipster/jhipster-uaa/gateway/src/test/java/com/baeldung/jhipster/gateway/security/oauth2/CookieCollectionUnitTest.java

@@ -16,7 +16,7 @@ import java.util.List;
  *
  * @see CookieCollection
  */
-public class CookieCollectionTest {
+public class CookieCollectionUnitTest {
     public static final String COOKIE_NAME = "chocolate";
     public static final String COOKIE_VALUE = "yummy";
     public static final String BROWNIE_NAME = "brownie";

jhipster/jhipster-uaa/gateway/src/test/java/com/baeldung/jhipster/gateway/security/oauth2/CookieTokenExtractorUnitTest.java

@@ -12,7 +12,7 @@ import org.springframework.security.oauth2.common.OAuth2AccessToken;
  * Test whether the CookieTokenExtractor can properly extract access tokens from
  * Cookies and Headers.
  */
-public class CookieTokenExtractorTest {
+public class CookieTokenExtractorUnitTest {
     private CookieTokenExtractor cookieTokenExtractor;
 
     @Before
@@ -22,24 +22,24 @@ public class CookieTokenExtractorTest {
 
     @Test
     public void testExtractTokenCookie() {
-        MockHttpServletRequest request = OAuth2AuthenticationServiceTest.createMockHttpServletRequest();
+        MockHttpServletRequest request = OAuth2AuthenticationServiceUnitTest.createMockHttpServletRequest();
         Authentication authentication = cookieTokenExtractor.extract(request);
-        Assert.assertEquals(OAuth2AuthenticationServiceTest.ACCESS_TOKEN_VALUE, authentication.getPrincipal().toString());
+        Assert.assertEquals(OAuth2AuthenticationServiceUnitTest.ACCESS_TOKEN_VALUE, authentication.getPrincipal().toString());
     }
 
     @Test
     public void testExtractTokenHeader() {
         MockHttpServletRequest request = new MockHttpServletRequest(HttpMethod.GET.name(), "http://www.test.com");
-        request.addHeader("Authorization", OAuth2AccessToken.BEARER_TYPE + " " + OAuth2AuthenticationServiceTest.ACCESS_TOKEN_VALUE);
+        request.addHeader("Authorization", OAuth2AccessToken.BEARER_TYPE + " " + OAuth2AuthenticationServiceUnitTest.ACCESS_TOKEN_VALUE);
         Authentication authentication = cookieTokenExtractor.extract(request);
-        Assert.assertEquals(OAuth2AuthenticationServiceTest.ACCESS_TOKEN_VALUE, authentication.getPrincipal().toString());
+        Assert.assertEquals(OAuth2AuthenticationServiceUnitTest.ACCESS_TOKEN_VALUE, authentication.getPrincipal().toString());
     }
 
     @Test
     public void testExtractTokenParam() {
         MockHttpServletRequest request = new MockHttpServletRequest(HttpMethod.GET.name(), "http://www.test.com");
-        request.addParameter(OAuth2AccessToken.ACCESS_TOKEN, OAuth2AuthenticationServiceTest.ACCESS_TOKEN_VALUE);
+        request.addParameter(OAuth2AccessToken.ACCESS_TOKEN, OAuth2AuthenticationServiceUnitTest.ACCESS_TOKEN_VALUE);
         Authentication authentication = cookieTokenExtractor.extract(request);
-        Assert.assertEquals(OAuth2AuthenticationServiceTest.ACCESS_TOKEN_VALUE, authentication.getPrincipal().toString());
+        Assert.assertEquals(OAuth2AuthenticationServiceUnitTest.ACCESS_TOKEN_VALUE, authentication.getPrincipal().toString());
     }
 }

jhipster/jhipster-uaa/gateway/src/test/java/com/baeldung/jhipster/gateway/security/oauth2/OAuth2AuthenticationServiceUnitTest.java

@@ -39,7 +39,7 @@ import static org.mockito.Mockito.when;
  * @see OAuth2AuthenticationService
  */
 @RunWith(MockitoJUnitRunner.class)
-public class OAuth2AuthenticationServiceTest {
+public class OAuth2AuthenticationServiceUnitTest {
     public static final String CLIENT_AUTHORIZATION = "Basic d2ViX2FwcDpjaGFuZ2VpdA==";
     public static final String ACCESS_TOKEN_VALUE = "eyJhbGciOiJSUzI1NiIsInR5cCI6IkpXVCJ9.eyJleHAiOjE0OTQyNzI4NDQsInVzZXJfbmFtZSI6InVzZXIiLCJhdXRob3JpdGllcyI6WyJST0xFX1VTRVIiXSwianRpIjoiNzc1ZTJkYWUtYWYzZi00YTdhLWExOTktNzNiZTU1MmIxZDVkIiwiY2xpZW50X2lkIjoid2ViX2FwcCIsInNjb3BlIjpbIm9wZW5pZCJdfQ.gEK0YcX2IpkpxnkxXXHQ4I0xzTjcy7edqb89ukYE0LPe7xUcZVwkkCJF_nBxsGJh2jtA6NzNLfY5zuL6nP7uoAq3fmvsyrcyR2qPk8JuuNzGtSkICx3kPDRjAT4ST8SZdeh7XCbPVbySJ7ZmPlRWHyedzLA1wXN0NUf8yZYS4ELdUwVBYIXSjkNoKqfWm88cwuNr0g0teypjPtjDqCnXFt1pibwdfIXn479Y1neNAdvSpHcI4Ost-c7APCNxW2gqX-0BItZQearxRgKDdBQ7CGPAIky7dA0gPuKUpp_VCoqowKCXqkE9yKtRQGIISewtj2UkDRZePmzmYrUBXRzfYw";
     public static final String REFRESH_TOKEN_VALUE = "eyJhbGciOiJSUzI1NiIsInR5cCI6IkpXVCJ9.eyJ1c2VyX25hbWUiOiJ1c2VyIiwic2NvcGUiOlsib3BlbmlkIl0sImF0aSI6Ijc3NWUyZGFlLWFmM2YtNGE3YS1hMTk5LTczYmU1NTJiMWQ1ZCIsImV4cCI6MTQ5Njg2NDc0MywiYXV0aG9yaXRpZXMiOlsiUk9MRV9VU0VSIl0sImp0aSI6IjhmYjI2YTllLTdjYzQtNDFlMi1hNzBjLTk4MDc0N2U2YWFiOSIsImNsaWVudF9pZCI6IndlYl9hcHAifQ.q1-Df9_AFO6TJNiLKV2YwTjRbnd7qcXv52skXYnog5siHYRoR6cPtm6TNQ04iDAoIHljTSTNnD6DS3bHk41mV55gsSVxGReL8VCb_R8ZmhVL4-5yr90sfms0wFp6lgD2bPmZ-TXiS2Oe9wcbNWagy5RsEplZ-sbXu3tjmDao4FN35ojPsXmUs84XnNQH3Y_-PY9GjZG0JEfLQIvE0J5BkXS18Z015GKyA6GBIoLhAGBQQYyG9m10ld_a9fD5SmCyCF72Jad_pfP1u8Z_WyvO-wrlBvm2x-zBthreVrXU5mOb9795wJEP-xaw3dXYGjht_grcW4vKUFtj61JgZk98CQ";

jhipster/jhipster-uaa/gateway/src/test/java/com/baeldung/jhipster/gateway/security/oauth2/OAuth2CookieHelperUnitTest.java

@@ -12,7 +12,7 @@ import org.springframework.test.util.ReflectionTestUtils;
  *
  * @see OAuth2CookieHelper
  */
-public class OAuth2CookieHelperTest {
+public class OAuth2CookieHelperUnitTest {
     public static final String GET_COOKIE_DOMAIN_METHOD = "getCookieDomain";
     private OAuth2Properties oAuth2Properties;
     private OAuth2CookieHelper cookieHelper;

jhipster/jhipster-uaa/gateway/src/test/java/com/baeldung/jhipster/gateway/web/rest/LogsResourceIntTest.java

@@ -51,7 +51,7 @@ public class LogsResourceIntTest {
     public void changeLogs() throws Exception {
         LoggerVM logger = new LoggerVM();
         logger.setLevel("INFO");
-        logger.setName("ROOT");
+        logger.setName("some.test.logger");
 
         restLogsMockMvc.perform(put("/management/logs")
             .contentType(TestUtil.APPLICATION_JSON_UTF8)

jhipster/jhipster-uaa/gateway/src/test/resources/config/application.yml

@@ -21,6 +21,8 @@ eureka:
         instanceId: gateway:${spring.application.instance-id:${random.value}}
 
 spring:
+    main:
+        banner-mode: "off"
     application:
         name: gateway
     cache:
@@ -93,7 +95,7 @@ jhipster:
         authentication:
             jwt:
                 # This token must be encoded using Base64 (you can type `echo 'secret-key'|base64` on your command line)
-                base64-secret: 
+                base64-secret:
                 # Token is valid 24 hours
                 token-validity-in-seconds: 86400
     metrics: # DropWizard Metrics configuration, used by MetricsConfiguration

jhipster/jhipster-uaa/quotes/pom.xml

@@ -1,6 +1,13 @@
 <?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/maven-v4_0_0.xsd">
     <modelVersion>4.0.0</modelVersion>
+
+    <parent>
+        <artifactId>jhipster-uaa</artifactId>
+        <groupId>com.baeldung.jhipster</groupId>
+        <version>1.0.0-SNAPSHOT</version>
+    </parent>
+
     <groupId>com.baeldung.jhipster.quotes</groupId>
     <artifactId>quotes</artifactId>
     <version>0.0.1-SNAPSHOT</version>
@@ -399,15 +406,6 @@
                     </execution>
                 </executions>
             </plugin>
-            <plugin>
-                <groupId>org.apache.maven.plugins</groupId>
-                <artifactId>maven-surefire-plugin</artifactId>
-                <version>${maven-surefire-plugin.version}</version>
-                <configuration>
-                    <!-- Force alphabetical order to have a reproducible build -->
-                    <runOrder>alphabetical</runOrder>
-                </configuration>
-            </plugin>
             <plugin>
                 <groupId>org.jacoco</groupId>
                 <artifactId>jacoco-maven-plugin</artifactId>
@@ -832,7 +830,7 @@
         </profile>
         <!-- jhipster-needle-maven-add-profile -->
     </profiles>
-	
+
     <properties>
         <!-- Build properties -->
         <maven.version>3.0.0</maven.version>
@@ -909,5 +907,5 @@
 
         <!-- jhipster-needle-maven-property -->
         <zalando.version>0.24.0</zalando.version>
-    </properties>	
+    </properties>
 </project>

jhipster/jhipster-uaa/quotes/src/test/java/com/baeldung/jhipster/quotes/config/WebConfigurerUnitTest.java

@@ -38,7 +38,7 @@ import static org.springframework.test.web.servlet.result.MockMvcResultMatchers.
  *
  * @see WebConfigurer
  */
-public class WebConfigurerTest {
+public class WebConfigurerUnitTest {
 
     private WebConfigurer webConfigurer;
 

jhipster/jhipster-uaa/quotes/src/test/java/com/baeldung/jhipster/quotes/web/rest/LogsResourceIntTest.java

@@ -51,7 +51,7 @@ public class LogsResourceIntTest {
     public void changeLogs() throws Exception {
         LoggerVM logger = new LoggerVM();
         logger.setLevel("INFO");
-        logger.setName("ROOT");
+        logger.setName("some.test.logger");
 
         restLogsMockMvc.perform(put("/management/logs")
             .contentType(TestUtil.APPLICATION_JSON_UTF8)

jhipster/jhipster-uaa/quotes/src/test/resources/config/application.yml

@@ -21,6 +21,8 @@ eureka:
         instanceId: quotes:${spring.application.instance-id:${random.value}}
 
 spring:
+    main:
+        banner-mode: "off"
     application:
         name: quotes
     cache:

jhipster/jhipster-uaa/uaa/pom.xml

@@ -1,6 +1,12 @@
 <?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/maven-v4_0_0.xsd">
     <modelVersion>4.0.0</modelVersion>
+    <parent>
+        <artifactId>jhipster-uaa</artifactId>
+        <groupId>com.baeldung.jhipster</groupId>
+        <version>1.0.0-SNAPSHOT</version>
+    </parent>
+
     <groupId>com.baeldung.jhipster.uaa</groupId>
     <artifactId>uaa</artifactId>
     <version>0.0.1-SNAPSHOT</version>
@@ -399,15 +405,6 @@
                     </execution>
                 </executions>
             </plugin>
-            <plugin>
-                <groupId>org.apache.maven.plugins</groupId>
-                <artifactId>maven-surefire-plugin</artifactId>
-                <version>${maven-surefire-plugin.version}</version>
-                <configuration>
-                    <!-- Force alphabetical order to have a reproducible build -->
-                    <runOrder>alphabetical</runOrder>
-                </configuration>
-            </plugin>
             <plugin>
                 <groupId>org.jacoco</groupId>
                 <artifactId>jacoco-maven-plugin</artifactId>
@@ -832,7 +829,7 @@
         </profile>
         <!-- jhipster-needle-maven-add-profile -->
     </profiles>
-	
+
     <properties>
         <lifecycle.mapping.version>1.0.0</lifecycle.mapping.version>
         <spring.web.version>0.24.0</spring.web.version>
@@ -911,5 +908,5 @@
 
         <!-- jhipster-needle-maven-property -->
     </properties>
-	
+
 </project>

jhipster/jhipster-uaa/uaa/src/test/java/com/baeldung/jhipster/uaa/config/WebConfigurerUnitTest.java

@@ -38,7 +38,7 @@ import static org.springframework.test.web.servlet.result.MockMvcResultMatchers.
  *
  * @see WebConfigurer
  */
-public class WebConfigurerTest {
+public class WebConfigurerUnitTest {
 
     private WebConfigurer webConfigurer;
 

jhipster/jhipster-uaa/uaa/src/test/java/com/baeldung/jhipster/uaa/web/rest/LogsResourceIntTest.java

@@ -51,7 +51,7 @@ public class LogsResourceIntTest {
     public void changeLogs() throws Exception {
         LoggerVM logger = new LoggerVM();
         logger.setLevel("INFO");
-        logger.setName("ROOT");
+        logger.setName("some.test.logger");
 
         restLogsMockMvc.perform(put("/management/logs")
             .contentType(TestUtil.APPLICATION_JSON_UTF8)

jhipster/jhipster-uaa/uaa/src/test/resources/config/application.yml

@@ -21,6 +21,8 @@ eureka:
         instanceId: uaa:${spring.application.instance-id:${random.value}}
 
 spring:
+    main:
+        banner-mode: "off"
     application:
         name: uaa
     cache:

jhipster/pom.xml

@@ -9,7 +9,7 @@
     <packaging>pom</packaging>
 
     <parent>
-    <!-- Jhipster project is autogenerated and upgrading it will need a newly generated project. 
+    <!-- Jhipster project is autogenerated and upgrading it will need a newly generated project.
         Also, we already have jhipster-5 which has new version of boot-2. So, this project should be left as a legacy version. -->
         <artifactId>parent-boot-1</artifactId>
         <groupId>com.baeldung</groupId>
@@ -17,11 +17,39 @@
         <relativePath>../parent-boot-1</relativePath>
     </parent>
 
+    <dependencyManagement>
+        <dependencies>
+            <dependency>
+                <groupId>org.springframework.boot</groupId>
+                <artifactId>spring-boot-starter-test</artifactId>
+                <version>${spring-boot.version}</version>
+                <exclusions>
+                    <exclusion>
+                        <groupId>com.vaadin.external.google</groupId>
+                        <artifactId>android-json</artifactId>
+                    </exclusion>
+                    <exclusion>
+                        <groupId>org.json</groupId>
+                        <artifactId>json</artifactId>
+                    </exclusion>
+                </exclusions>
+                <scope>test</scope>
+            </dependency>
+        </dependencies>
+    </dependencyManagement>
+
     <dependencies>
         <dependency>
             <groupId>org.hibernate</groupId>
             <artifactId>hibernate-java8</artifactId>
         </dependency>
+
+        <dependency>
+            <groupId>net.bytebuddy</groupId>
+            <artifactId>byte-buddy</artifactId>
+            <version>${byte-buddy.version}</version>
+            <scope>test</scope>
+        </dependency>
     </dependencies>
 
     <modules>
@@ -29,5 +57,5 @@
         <module>jhipster-microservice</module>
 		<module>jhipster-uaa</module>
 	</modules>
-	
+
 </project>

ksqldb/README.md

@@ -0,0 +1,3 @@
+### Relevant Articles:
+
+- [Introduction to ksqlDB](https://www.baeldung.com/ksqldb)

libraries-security/pom.xml

@@ -78,6 +78,29 @@
             <artifactId>sshd-core</artifactId>
             <version>${apache-mina.version}</version>
         </dependency>
+        <dependency>
+            <groupId>org.xacml4j</groupId>
+            <artifactId>xacml-core</artifactId>
+            <version>${xacml4j.version}</version>
+            <exclusions>
+                <exclusion>
+                    <groupId>org.slf4j</groupId>
+                    <artifactId>slf4j-log4j12</artifactId>
+                </exclusion>
+            </exclusions>
+        </dependency>
+        <dependency>
+            <groupId>org.xacml4j</groupId>
+            <artifactId>xacml-test</artifactId>
+            <version>${xacml4j.version}</version>
+            <scope>test</scope>
+            <exclusions>
+                <exclusion>
+                    <groupId>org.slf4j</groupId>
+                    <artifactId>slf4j-log4j12</artifactId>
+                </exclusion>
+            </exclusions>
+        </dependency>
     </dependencies>
 
     <properties>
@@ -90,6 +113,7 @@
         <jsch.version>0.1.55</jsch.version>
         <apache-mina.version>2.5.1</apache-mina.version>
         <spring-security-oauth2.version>2.4.0.RELEASE</spring-security-oauth2.version>
+        <xacml4j.version>1.4.0</xacml4j.version>
     </properties>
 
 </project>

libraries-security/src/main/java/com/baeldung/scribejava/ScribejavaApplication.java

@@ -2,9 +2,11 @@ package com.baeldung.scribejava;
 
 import org.springframework.boot.SpringApplication;
 import org.springframework.boot.autoconfigure.SpringBootApplication;
+import org.springframework.boot.web.servlet.ServletComponentScan;
 
 
 @SpringBootApplication
+@ServletComponentScan
 public class ScribejavaApplication {
 
     public static void main(String[] args) {

libraries-security/src/main/java/com/baeldung/scribejava/controller/RBACController.java

@@ -0,0 +1,27 @@
+package com.baeldung.scribejava.controller;
+
+import java.io.IOException;
+
+import javax.annotation.security.DeclareRoles;
+import javax.annotation.security.RolesAllowed;
+import javax.servlet.ServletException;
+import javax.servlet.annotation.HttpConstraint;
+import javax.servlet.annotation.ServletSecurity;
+import javax.servlet.annotation.WebServlet;
+import javax.servlet.http.HttpServlet;
+import javax.servlet.http.HttpServletRequest;
+import javax.servlet.http.HttpServletResponse;
+
+@WebServlet(name="rbac", urlPatterns = {"/protected"})
+@DeclareRoles("USER")
+@ServletSecurity(
+    @HttpConstraint(rolesAllowed = "USER")
+)
+public class RBACController  extends HttpServlet {
+
+    private static final long serialVersionUID = 1L;
+
+    protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
+        resp.getWriter().println("Hello, USER");
+    }
+}

libraries-security/src/test/java/com/baeldung/xacml4j/NightlyWithdrawalPolicyUnitTest.java

@@ -0,0 +1,233 @@
+package com.baeldung.xacml4j;
+
+import static org.junit.Assert.assertEquals;
+import static org.junit.Assert.assertNotNull;
+import static org.junit.Assert.assertTrue;
+
+import java.util.ArrayList;
+import java.util.List;
+
+import org.junit.Test;
+import org.xacml4j.v20.Xacml20TestUtility;
+import org.xacml4j.v30.Attribute;
+import org.xacml4j.v30.Categories;
+import org.xacml4j.v30.Category;
+import org.xacml4j.v30.CompositeDecisionRule;
+import org.xacml4j.v30.Decision;
+import org.xacml4j.v30.Entity;
+import org.xacml4j.v30.RequestContext;
+import org.xacml4j.v30.ResponseContext;
+import org.xacml4j.v30.Result;
+import org.xacml4j.v30.XacmlPolicyTestSupport;
+import org.xacml4j.v30.pdp.PolicyDecisionPoint;
+import org.xacml4j.v30.pdp.PolicyDecisionPointBuilder;
+import org.xacml4j.v30.spi.combine.DecisionCombiningAlgorithmProviderBuilder;
+import org.xacml4j.v30.spi.function.FunctionProviderBuilder;
+import org.xacml4j.v30.spi.pip.PolicyInformationPointBuilder;
+import org.xacml4j.v30.spi.repository.InMemoryPolicyRepository;
+import org.xacml4j.v30.spi.repository.PolicyRepository;
+import org.xacml4j.v30.types.DoubleExp;
+import org.xacml4j.v30.types.StringExp;
+import org.xacml4j.v30.types.TimeExp;
+
+public class NightlyWithdrawalPolicyUnitTest extends XacmlPolicyTestSupport {
+    
+    private static final String POLICY_SET = "xacml4j/NightlyWithdrawalsPolicy.xml";
+
+    @Test
+    public void testWhenNightlyWithdrawalOver500_thenFail() throws Exception {
+
+        PolicyDecisionPoint pdp = buildPDP(POLICY_SET);
+
+        // Action category
+        Attribute actionAttribute = Attribute.builder("urn:oasis:names:tc:xacml:1.0:action:action-id")
+            .value(StringExp.of("withdrawal"))
+            .build();
+        Entity actionEntity = Entity.builder()
+            .attribute(actionAttribute)
+            .build();
+        Category actionCategory = Category.builder(Categories.ACTION)
+            .entity(actionEntity)
+            .build();
+
+        // Environment Category
+        Attribute timeAttribute = Attribute.builder("urn:oasis:names:tc:xacml:1.0:environment:current-time")
+            .includeInResult(false)
+            .value(TimeExp.of("21:00:00"))
+            .build();
+        Entity timeEntity = Entity.builder()
+            .attribute(timeAttribute)
+            .build();
+
+        Category environmentCategory = Category.builder(Categories.ENVIRONMENT)
+            .entity(timeEntity)
+            .build();
+
+        // ATM category
+        Attribute amountAttribute = Attribute.builder("urn:baeldung:atm:withdrawal:amount")
+            .value(DoubleExp.of("1200.00"))
+            .build();
+        Entity atmEntity = Entity.builder()
+            .attribute(amountAttribute)
+            .build();
+
+        Category atmCategory = Category.builder(Categories.parse("urn:baeldung:atm:withdrawal"))
+            .entity(atmEntity)
+            .build();
+
+        RequestContext request = RequestContext.builder()
+            .attributes(actionCategory, environmentCategory, atmCategory)
+            .build();
+
+        ResponseContext response = pdp.decide(request);
+        assertNotNull(response);
+        assertTrue("Shoud have at least one result", response.getResults() != null && !response.getResults()
+            .isEmpty());
+
+        Result result = response.getResults()
+            .iterator()
+            .next();
+        assertTrue("Evaluation should succeed", result.getStatus()
+            .isSuccess());
+        assertEquals("Should DENY withdrawal", Decision.DENY, result.getDecision());
+
+    }
+
+    @Test
+    public void testWhenNightlyWithdrawalUnder500_thenSuccess() throws Exception {
+
+        PolicyDecisionPoint pdp = buildPDP(POLICY_SET);
+
+        // Action category
+        Attribute actionAttribute = Attribute.builder("urn:oasis:names:tc:xacml:1.0:action:action-id")
+            .includeInResult(false)
+            .value(StringExp.of("withdrawal"))
+            .build();
+        Entity actionEntity = Entity.builder()
+            .attribute(actionAttribute)
+            .build();
+        Category actionCategory = Category.builder(Categories.ACTION)
+            .entity(actionEntity)
+            .build();
+
+        // Environment Category
+        Attribute timeAttribute = Attribute.builder("urn:oasis:names:tc:xacml:1.0:environment:current-time")
+            .includeInResult(false)
+            .value(TimeExp.of("21:00:00"))
+            .build();
+        Entity timeEntity = Entity.builder()
+            .attribute(timeAttribute)
+            .build();
+        Category environmentCategory = Category.builder(Categories.ENVIRONMENT)
+            .entity(timeEntity)
+            .build();
+
+        // ATM category
+        Attribute amountAttribute = Attribute.builder("urn:baeldung:atm:withdrawal:amount")
+            .value(DoubleExp.of("499.00"))
+            .build();
+        Entity atmEntity = Entity.builder()
+          .attribute(amountAttribute)
+          .build();
+        Category atmCategory = Category.builder(Categories.parse("urn:baeldung:atm:withdrawal"))
+          .entity(atmEntity)
+          .build();
+
+        RequestContext request = RequestContext.builder()
+          .attributes(actionCategory, environmentCategory, atmCategory)
+          .build();
+
+        ResponseContext response = pdp.decide(request);
+        assertNotNull(response);
+        assertTrue("Shoud have at least one result", 
+          response.getResults() != null && !response.getResults().isEmpty());
+
+        Result result = response.getResults().iterator().next();
+        assertTrue("Evaluation should succeed", result.getStatus().isSuccess());
+        assertEquals("Should PERMIT withdrawal", Decision.PERMIT, result.getDecision());
+
+    }
+
+    @Test
+    public void testWhenBusinessHoursWithdrawalOver500_thenSuccess() throws Exception {
+
+        PolicyDecisionPoint pdp = buildPDP(POLICY_SET);
+
+        // Action category
+        Attribute actionAttribute = Attribute.builder("urn:oasis:names:tc:xacml:1.0:action:action-id")
+          .includeInResult(false)
+          .value(StringExp.of("withdrawal"))
+          .build();
+        Entity actionEntity = Entity.builder()
+          .attribute(actionAttribute)
+          .build();
+        Category actionCategory = Category.builder(Categories.ACTION)
+          .entity(actionEntity)
+          .build();
+
+        // Environment Category
+        Attribute timeAttribute = Attribute.builder("urn:oasis:names:tc:xacml:1.0:environment:current-time")
+          .includeInResult(false)
+          .value(TimeExp.of("12:00:00"))
+          .build();
+        Entity timeEntity = Entity.builder()
+          .attribute(timeAttribute)
+          .build();
+        Category environmentCategory = Category.builder(Categories.ENVIRONMENT)
+          .entity(timeEntity)
+          .build();
+
+        // ATM category
+        Attribute amountAttribute = Attribute.builder("urn:baeldung:atm:withdrawal:amount")
+          .value(DoubleExp.of("2000.00"))
+          .build();
+        Entity atmEntity = Entity.builder()
+          .attribute(amountAttribute)
+          .build();
+
+        Category atmCategory = Category.builder(Categories.parse("urn:baeldung:atm:withdrawal"))
+          .entity(atmEntity)
+          .build();
+
+        RequestContext request = RequestContext.builder()
+          .attributes(actionCategory, environmentCategory, atmCategory)
+          .build();
+
+        ResponseContext response = pdp.decide(request);
+        assertNotNull(response);
+        assertTrue("Shoud have at least one result", response.getResults() != null && !response.getResults()
+          .isEmpty());
+
+        Result result = response.getResults()
+          .iterator()
+          .next();
+        assertTrue("Evaluation should succeed", result.getStatus().isSuccess());
+        assertEquals("Should PERMIT withdrawal", Decision.PERMIT, result.getDecision());
+
+    }
+
+    private PolicyDecisionPoint buildPDP(String... policyResources) throws Exception {
+        PolicyRepository repository = new InMemoryPolicyRepository("tes-repository", FunctionProviderBuilder.builder()
+          .defaultFunctions()
+          .build(),
+        DecisionCombiningAlgorithmProviderBuilder.builder()
+            .withDefaultAlgorithms()
+            .create());
+
+        List<CompositeDecisionRule> policies = new ArrayList<CompositeDecisionRule>(policyResources.length);
+        for (String policyResource : policyResources) {
+            CompositeDecisionRule policy = repository.importPolicy(Xacml20TestUtility.getClasspathResource(policyResource));
+            log.info("Policy: {}", policy);
+            policies.add(policy);
+        }
+
+        return PolicyDecisionPointBuilder.builder("testPdp")
+          .policyRepository(repository)
+          .pip(PolicyInformationPointBuilder.builder("testPip")
+          .defaultResolvers()
+          .build())
+          .rootPolicy(policies.get(0))
+          .build();
+    }
+
+}

libraries-security/src/test/resources/xacml4j/NightlyWithdrawalsPolicy.xml

@@ -0,0 +1,137 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<Policy xmlns="urn:oasis:names:tc:xacml:3.0:core:schema:wd-17" 
+  xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" 
+  xsi:schemaLocation="urn:oasis:names:tc:xacml:3.0:core:schema:wd-17 http://docs.oasis-open.org/xacml/3.0/xacml-core-v3-schema-wd-17.xsd" 
+  PolicyId="urn:baeldung:atm:WithdrawalPolicy"
+  Version="1.0" 
+  RuleCombiningAlgId="urn:oasis:names:tc:xacml:1.0:rule-combining-algorithm:deny-overrides">
+    <Description>
+       Withdrawal policy example
+    </Description>
+    <Target/>
+    <Rule RuleId="urn:oasis:names:tc:baeldung:WithDrawalPolicy:Rule1" Effect="Deny">
+        <Description>
+Deny withdrawals over $500 between 20:00 and 08:00
+        </Description>
+        <Target>
+            <AnyOf>
+                <AllOf>
+                    <Match MatchId="urn:oasis:names:tc:xacml:1.0:function:string-equal">
+                        <AttributeValue DataType="http://www.w3.org/2001/XMLSchema#string">withdrawal</AttributeValue>
+                        <AttributeDesignator 
+                            DataType="http://www.w3.org/2001/XMLSchema#string" 
+                            MustBePresent="true" 
+                            Category="urn:oasis:names:tc:xacml:3.0:attribute-category:action" 
+                            AttributeId="urn:oasis:names:tc:xacml:1.0:action:action-id"/>
+                    </Match>
+                </AllOf>
+            </AnyOf>
+        </Target>
+        <Condition>
+            <Apply FunctionId="urn:oasis:names:tc:xacml:1.0:function:and">
+                <Apply FunctionId="urn:oasis:names:tc:xacml:1.0:function:not">
+                    <Apply FunctionId="urn:oasis:names:tc:xacml:1.0:function:time-in-range">
+                        <Apply FunctionId="urn:oasis:names:tc:xacml:1.0:function:time-one-and-only">
+                            <AttributeDesignator
+                                DataType="http://www.w3.org/2001/XMLSchema#time"
+                                MustBePresent="true"
+                                Category="urn:oasis:names:tc:xacml:3.0:attribute-category:environment"
+                                AttributeId="urn:oasis:names:tc:xacml:1.0:environment:current-time"/>
+                        </Apply>
+                        <AttributeValue DataType="http://www.w3.org/2001/XMLSchema#time">08:00:00</AttributeValue>
+                        <AttributeValue DataType="http://www.w3.org/2001/XMLSchema#time">20:00:00</AttributeValue>
+                    </Apply>
+                </Apply>
+                <Apply FunctionId="urn:oasis:names:tc:xacml:1.0:function:double-greater-than">
+                    <Apply FunctionId="urn:oasis:names:tc:xacml:1.0:function:double-one-and-only">
+                        <AttributeDesignator
+                            DataType="http://www.w3.org/2001/XMLSchema#double"
+                            MustBePresent="true"
+                            Category="urn:baeldung:atm:withdrawal"
+                            AttributeId="urn:baeldung:atm:withdrawal:amount"/>
+                    </Apply>
+                    <AttributeValue DataType="http://www.w3.org/2001/XMLSchema#double">500.00</AttributeValue>
+                </Apply>
+            </Apply>
+        </Condition>
+    </Rule>
+    <Rule RuleId="urn:oasis:names:tc:baeldung:WithDrawalPolicy:Rule2" Effect="Permit">
+        <Description>
+Permit withdrawals under $500 between 20:00 and 08:00
+        </Description>
+        <Target>
+            <AnyOf>
+                <AllOf>
+                    <Match MatchId="urn:oasis:names:tc:xacml:1.0:function:string-equal">
+                        <AttributeValue DataType="http://www.w3.org/2001/XMLSchema#string">withdrawal</AttributeValue>
+                        <AttributeDesignator 
+                            DataType="http://www.w3.org/2001/XMLSchema#string" 
+                            MustBePresent="true" 
+                            Category="urn:oasis:names:tc:xacml:3.0:attribute-category:action" 
+                            AttributeId="urn:oasis:names:tc:xacml:1.0:action:action-id"/>
+                    </Match>
+                </AllOf>
+            </AnyOf>
+        </Target>
+        <Condition>
+            <Apply FunctionId="urn:oasis:names:tc:xacml:1.0:function:and">
+                <Apply FunctionId="urn:oasis:names:tc:xacml:1.0:function:not">
+                    <Apply FunctionId="urn:oasis:names:tc:xacml:1.0:function:time-in-range">
+                        <Apply FunctionId="urn:oasis:names:tc:xacml:1.0:function:time-one-and-only">
+                            <AttributeDesignator
+                                DataType="http://www.w3.org/2001/XMLSchema#time"
+                                MustBePresent="true"
+                                Category="urn:oasis:names:tc:xacml:3.0:attribute-category:environment"
+                                AttributeId="urn:oasis:names:tc:xacml:1.0:environment:current-time"/>
+                        </Apply>
+                        <AttributeValue DataType="http://www.w3.org/2001/XMLSchema#time">08:00:00</AttributeValue>
+                        <AttributeValue DataType="http://www.w3.org/2001/XMLSchema#time">20:00:00</AttributeValue>
+                    </Apply>
+                </Apply>
+                <Apply FunctionId="urn:oasis:names:tc:xacml:1.0:function:double-less-than-or-equal">
+                    <Apply FunctionId="urn:oasis:names:tc:xacml:1.0:function:double-one-and-only">
+                        <AttributeDesignator
+                            DataType="http://www.w3.org/2001/XMLSchema#double"
+                            MustBePresent="true"
+                            Category="urn:baeldung:atm:withdrawal"
+                            AttributeId="urn:baeldung:atm:withdrawal:amount"/>
+                    </Apply>
+                    <AttributeValue DataType="http://www.w3.org/2001/XMLSchema#double">500.00</AttributeValue>
+                </Apply>
+            </Apply>
+        </Condition>
+    </Rule>
+    <Rule RuleId="urn:oasis:names:tc:baeldung:WithDrawalPolicy:Rule3" Effect="Permit">
+        <Description>
+Permit withdrawals of any value between 08:00 and 20:00
+        </Description>
+        <Target>
+            <AnyOf>
+                <AllOf>
+                    <Match MatchId="urn:oasis:names:tc:xacml:1.0:function:string-equal">
+                        <AttributeValue DataType="http://www.w3.org/2001/XMLSchema#string">withdrawal</AttributeValue>
+                        <AttributeDesignator 
+                            DataType="http://www.w3.org/2001/XMLSchema#string" 
+                            MustBePresent="true" 
+                            Category="urn:oasis:names:tc:xacml:3.0:attribute-category:action" 
+                            AttributeId="urn:oasis:names:tc:xacml:1.0:action:action-id"/>
+                    </Match>
+                </AllOf>
+            </AnyOf>
+        </Target>
+        <Condition>
+            <Apply FunctionId="urn:oasis:names:tc:xacml:1.0:function:time-in-range">
+                <Apply FunctionId="urn:oasis:names:tc:xacml:1.0:function:time-one-and-only">
+                    <AttributeDesignator
+                        DataType="http://www.w3.org/2001/XMLSchema#time"
+                        MustBePresent="true"
+                        Category="urn:oasis:names:tc:xacml:3.0:attribute-category:environment"
+                        AttributeId="urn:oasis:names:tc:xacml:1.0:environment:current-time"/>
+                </Apply>
+                <AttributeValue DataType="http://www.w3.org/2001/XMLSchema#time">08:00:00</AttributeValue>
+                <AttributeValue DataType="http://www.w3.org/2001/XMLSchema#time">20:00:00</AttributeValue>
+            </Apply>
+        </Condition>
+    </Rule>
+    
+</Policy>

libraries-security/src/test/resources/xacml4j/Request.xml

@@ -0,0 +1,30 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<Request 
+    xmlns="urn:oasis:names:tc:xacml:3.0:core:schema:wd-17"
+    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+    xsi:schemaLocation="urn:oasis:names:tc:xacml:3.0:core:schema:wd-17 http://docs.oasis-open.org/xacml/3.0/xacml-core-v3-schema-wd-17.xsd"
+    CombinedDecision="true"
+    ReturnPolicyIdList="false">
+    
+    <Attributes Category="urn:oasis:names:tc:xacml:3.0:attribute-category:action">
+        <Attribute 
+            IncludeInResult="false" 
+            AttributeId="urn:oasis:names:tc:xacml:3.0:attribute-category:action">
+            <AttributeValue DataType="http://www.w3.org/2001/XMLSchema#string">withdrawal</AttributeValue>
+        </Attribute>
+    </Attributes>
+    <Attributes Category="urn:oasis:names:tc:xacml:3.0:attribute-category:action">
+        <Attribute 
+            IncludeInResult="false" 
+            AttributeId="urn:oasis:names:tc:xacml:1.0:environment:current-time">
+            <AttributeValue DataType="http://www.w3.org/2001/XMLSchema#time">21:00:00</AttributeValue>
+        </Attribute>
+    </Attributes>
+    <Attributes Category="urn:baeldung:atm:withdrawal">
+        <Attribute 
+            IncludeInResult="false" 
+            AttributeId="urn:baeldung:atm:withdrawal:amount">
+            <AttributeValue DataType="http://www.w3.org/2001/XMLSchema#decimal">1200</AttributeValue>
+        </Attribute>
+    </Attributes>
+</Request>

libraries-security/src/test/resources/xacml4j/Response.xml

@@ -0,0 +1,9 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<Response xmlns="urn:oasis:names:tc:xacml:2.0:context:schema:os" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="urn:oasis:names:tc:xacml:2.0:context:schema:os http://docs.oasis-open.org/xacml/access_control-xacml-2.0-context-schema-os.xsd">
+	<Result>
+		<Decision>NotApplicable</Decision>
+		<Status>
+			<StatusCode Value="urn:oasis:names:tc:xacml:1.0:status:ok"/>
+		</Status>
+	</Result>
+</Response>

libraries/pom.xml

@@ -40,6 +40,11 @@
             <artifactId>javatuples</artifactId>
             <version>${javatuples.version}</version>
         </dependency>
+        <dependency>
+            <groupId>org.javassist</groupId>
+            <artifactId>javassist</artifactId>
+            <version>${javaassist.version}</version>
+        </dependency>
         <!-- https://mvnrepository.com/artifact/org.assertj/assertj-core -->
         <dependency>
             <groupId>org.assertj</groupId>
@@ -51,42 +56,6 @@
             <artifactId>javers-core</artifactId>
             <version>${javers.version}</version>
         </dependency>
-        <dependency>
-            <groupId>net.serenity-bdd</groupId>
-            <artifactId>serenity-core</artifactId>
-            <version>${serenity.version}</version>
-            <scope>test</scope>
-            <exclusions>
-                <exclusion>
-                    <groupId>org.asciidoctor</groupId>
-                    <artifactId>asciidoctorj</artifactId>
-                </exclusion>
-            </exclusions>
-        </dependency>
-        <dependency>
-            <groupId>net.serenity-bdd</groupId>
-            <artifactId>serenity-junit</artifactId>
-            <version>${serenity.version}</version>
-            <scope>test</scope>
-        </dependency>
-        <dependency>
-            <groupId>net.serenity-bdd</groupId>
-            <artifactId>serenity-jbehave</artifactId>
-            <version>${serenity.jbehave.version}</version>
-            <scope>test</scope>
-        </dependency>
-        <dependency>
-            <groupId>net.serenity-bdd</groupId>
-            <artifactId>serenity-rest-assured</artifactId>
-            <version>${serenity.version}</version>
-            <scope>test</scope>
-        </dependency>
-        <dependency>
-            <groupId>net.serenity-bdd</groupId>
-            <artifactId>serenity-jira-requirements-provider</artifactId>
-            <version>${serenity.jira.version}</version>
-            <scope>test</scope>
-        </dependency>
         <!-- JDO -->
         <dependency>
             <groupId>org.datanucleus</groupId>
@@ -139,30 +108,6 @@
             <artifactId>spring-web</artifactId>
             <version>${spring.version}</version>
         </dependency>
-        <dependency>
-            <groupId>net.serenity-bdd</groupId>
-            <artifactId>serenity-spring</artifactId>
-            <version>${serenity.version}</version>
-            <scope>test</scope>
-            <exclusions>
-                <exclusion>
-                    <groupId>org.springframework</groupId>
-                    <artifactId>spring-test</artifactId>
-                </exclusion>
-            </exclusions>
-        </dependency>
-        <dependency>
-            <groupId>net.serenity-bdd</groupId>
-            <artifactId>serenity-screenplay</artifactId>
-            <version>${serenity.version}</version>
-            <scope>test</scope>
-        </dependency>
-        <dependency>
-            <groupId>net.serenity-bdd</groupId>
-            <artifactId>serenity-screenplay-webdriver</artifactId>
-            <version>${serenity.version}</version>
-            <scope>test</scope>
-        </dependency>
         <!-- JetS3t -->
         <dependency>
             <groupId>org.lucee</groupId>
@@ -253,29 +198,6 @@
 
     <build>
         <plugins>
-            <plugin>
-                <artifactId>maven-failsafe-plugin</artifactId>
-                <version>${maven-failsafe-plugin.version}</version>
-                <configuration>
-                    <systemProperties>
-                        <webdriver.chrome.driver>chromedriver</webdriver.chrome.driver>
-                    </systemProperties>
-                </configuration>
-            </plugin>
-            <plugin>
-                <groupId>net.serenity-bdd.maven.plugins</groupId>
-                <artifactId>serenity-maven-plugin</artifactId>
-                <version>${serenity.plugin.version}</version>
-                <executions>
-                    <execution>
-                        <id>serenity-reports</id>
-                        <phase>post-integration-test</phase>
-                        <goals>
-                            <goal>aggregate</goal>
-                        </goals>
-                    </execution>
-                </executions>
-            </plugin>
             <!-- JDO Plugin -->
             <plugin>
                 <groupId>org.datanucleus</groupId>
@@ -380,6 +302,7 @@
         <spring.version>4.3.8.RELEASE</spring.version>
         <spring-mock-mvc.version>3.0.3</spring-mock-mvc.version>
         <quartz.version>2.3.0</quartz.version>
+        <javaassist.version>3.21.0-GA</javaassist.version>
         <jool.version>0.9.12</jool.version>
         <maven-jar-plugin.version>3.0.2</maven-jar-plugin.version>
         <commons-net.version>3.6</commons-net.version>

libraries/serenity.properties

@@ -1,4 +0,0 @@
-jira.url=<jira-url>
-jira.project=<jira-project>
-jira.username=<jira-username>
-jira.password=<jira-password>

maven-modules/maven-parent-pom-resolution/README.md

@@ -0,0 +1,3 @@
+### Relevant Articles:
+
+- [Understanding the "relativePath" Tag - Maven Parent POM Resolution At A Glance](https://www.baeldung.com/maven-relativepath)

maven-modules/maven-parent-pom-resolution/pom.xml

@@ -0,0 +1,28 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project xmlns="http://maven.apache.org/POM/4.0.0"
+    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+    xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
+    <modelVersion>4.0.0</modelVersion>
+    <groupId>com.baeldung</groupId>
+    <artifactId>maven-parent-pom-resolution</artifactId>
+    <version>1.0-SNAPSHOT</version>
+    <packaging>pom</packaging>
+
+    <modules>
+        <module>project-a</module>
+    </modules>
+
+    <!-- to detect the POM hierarchy, just type "mvn dependency:display-ancestors" -->
+    <build>
+        <pluginManagement>
+            <plugins>
+                <plugin>
+                    <groupId>org.apache.maven.plugins</groupId>
+                    <artifactId>maven-dependency-plugin</artifactId>
+                    <version>3.2.0</version>
+                </plugin>
+            </plugins>
+        </pluginManagement>
+    </build>
+
+</project>

maven-modules/maven-parent-pom-resolution/project-a/pom.xml

@@ -0,0 +1,20 @@
+<?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>project-a</artifactId>
+    <parent>
+        <groupId>com.baeldung</groupId>
+        <artifactId>maven-parent-pom-resolution</artifactId>
+        <version>1.0-SNAPSHOT</version>
+        <!-- The parent pom is resolved to ../pom.xml -->
+    </parent>
+    <packaging>pom</packaging>
+
+    <modules>
+        <module>project-b</module>
+        <module>project-c</module>
+    </modules>
+
+</project>

maven-modules/maven-parent-pom-resolution/project-a/project-b/pom.xml

@@ -0,0 +1,15 @@
+<?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>project-b</artifactId>
+    <parent>
+        <groupId>com.baeldung</groupId>
+        <artifactId>project-a</artifactId>
+        <version>1.0-SNAPSHOT</version>
+        <!-- The parent pom is resolved to project a's pom.xml -->
+    </parent>
+    <packaging>pom</packaging>
+
+</project>

maven-modules/maven-parent-pom-resolution/project-a/project-c/pom.xml

@@ -0,0 +1,20 @@
+<?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>project-c</artifactId>
+    <parent>
+        <groupId>com.baeldung</groupId>
+        <artifactId>project-b</artifactId>
+        <version>1.0-SNAPSHOT</version>
+        <relativePath>../project-b/pom.xml</relativePath>
+        <!-- The parent pom is resolved to project a's pom.xml -->
+    </parent>
+    <packaging>pom</packaging>
+
+    <modules>
+        <module>project-d</module>
+    </modules>
+
+</project>

maven-modules/maven-parent-pom-resolution/project-a/project-c/project-d/pom.xml

@@ -0,0 +1,17 @@
+<?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>project-d</artifactId>
+    <parent>
+        <groupId>com.baeldung</groupId>
+        <artifactId>project-a</artifactId>
+        <version>1.0-SNAPSHOT</version>
+        <!-- removing relativePath won't work even if project-a is the aggregator project -->
+        <!-- it only works in IntelliJ IDEA when project-a is registered as a Maven Project -->
+        <relativePath>../../pom.xml</relativePath>
+    </parent>
+    <packaging>pom</packaging>
+
+</project>

maven-modules/maven-properties/pom.xml

@@ -13,12 +13,12 @@
         <version>1.0.0-SNAPSHOT</version>
         <relativePath>../..</relativePath>
     </parent>
-
+	    
     <dependencies>
         <dependency>
             <groupId>junit</groupId>
             <artifactId>junit</artifactId>
-            <version>4.13</version>
+	    <version>${junit.version}</version>
         </dependency>
     </dependencies>
 
@@ -46,6 +46,7 @@
     <properties>
         <name>${project.name}</name>
         <my.awesome.property>property-from-pom</my.awesome.property>
+        <junit.version>4.13</junit.version> 
     </properties>
 
-</project>
+</project>

maven-modules/maven-surefire-plugin/README.md

@@ -0,0 +1,3 @@
+## Relevant Articles:
+
+- [Running a Single Test or Method With Maven](https://www.baeldung.com/maven-run-single-test)

maven-modules/pom.xml

@@ -36,6 +36,7 @@
         <module>host-maven-repo-example</module>
         <module>plugin-management</module>
         <module>maven-surefire-plugin</module>
+        <module>maven-parent-pom-resolution</module>
     </modules>
 
 </project>

parent-spring-5/pom.xml

@@ -30,7 +30,7 @@
     </dependencies>
 
     <properties>
-        <spring.version>5.3.7</spring.version>
+        <spring.version>5.3.9</spring.version>
         <spring-security.version>5.2.3.RELEASE</spring-security.version>
         <spring-boot-starter-test.version>1.5.10.RELEASE</spring-boot-starter-test.version>
     </properties>

patterns/design-patterns-architectural/README.md

@@ -3,3 +3,4 @@
 - [The DAO Pattern in Java](https://www.baeldung.com/java-dao-pattern)
 - [DAO vs Repository Patterns](https://www.baeldung.com/java-dao-vs-repository)
 - [Difference Between MVC and MVP Patterns](https://www.baeldung.com/mvc-vs-mvp-pattern)
+- [The DTO Pattern (Data Transfer Object)](https://www.baeldung.com/java-dto-pattern)

patterns/design-patterns-architectural/pom.xml

@@ -15,6 +15,21 @@
     </parent>
 
     <dependencies>
+        <dependency>
+            <groupId>org.springframework.boot</groupId>
+            <artifactId>spring-boot-starter-web</artifactId>
+            <version>${spring-boot.version}</version>
+        </dependency>
+        <dependency>
+            <groupId>org.springframework.boot</groupId>
+            <artifactId>spring-boot-starter-test</artifactId>
+            <version>${spring-boot.version}</version>
+        </dependency>
+        <dependency>
+            <groupId>io.rest-assured</groupId>
+            <artifactId>rest-assured</artifactId>
+            <version>${rest-assured.version}</version>
+        </dependency>
         <dependency>
             <groupId>org.assertj</groupId>
             <artifactId>assertj-core</artifactId>
@@ -38,6 +53,9 @@
         <assertj-core.version>3.9.1</assertj-core.version>
         <hibernate-core.version>5.2.16.Final</hibernate-core.version>
         <mysql-connector.version>6.0.6</mysql-connector.version>
+        <spring-boot.version>2.5.3</spring-boot.version>
+        <rest-assured.version>3.3.0</rest-assured.version>
+
     </properties>
 
 </project>

patterns/design-patterns-architectural/src/main/java/com/baeldung/dtopattern/Main.java

@@ -0,0 +1,12 @@
+package com.baeldung.dtopattern;
+
+import org.springframework.boot.SpringApplication;
+import org.springframework.boot.autoconfigure.SpringBootApplication;
+
+@SpringBootApplication
+public class Main {
+    public static void main(String[] args) {
+        SpringApplication.run(Main.class, args);
+    }
+}
+

patterns/design-patterns-architectural/src/main/java/com/baeldung/dtopattern/api/Mapper.java

@@ -0,0 +1,28 @@
+package com.baeldung.dtopattern.api;
+
+import com.baeldung.dtopattern.domain.Role;
+import com.baeldung.dtopattern.domain.User;
+import org.springframework.stereotype.Component;
+
+import java.util.ArrayList;
+import java.util.List;
+
+import static java.util.stream.Collectors.toList;
+
+@Component
+class Mapper {
+    public UserDTO toDto(User user) {
+        String name = user.getName();
+        List<String> roles = user
+                .getRoles()
+                .stream()
+                .map(Role::getName)
+                .collect(toList());
+
+        return new UserDTO(name, roles);
+    }
+
+    public User toUser(UserCreationDTO userDTO) {
+        return new User(userDTO.getName(), userDTO.getPassword(), new ArrayList<>());
+    }
+}

patterns/design-patterns-architectural/src/main/java/com/baeldung/dtopattern/api/UserController.java

@@ -0,0 +1,51 @@
+package com.baeldung.dtopattern.api;
+
+import com.baeldung.dtopattern.domain.RoleService;
+import com.baeldung.dtopattern.domain.User;
+import com.baeldung.dtopattern.domain.UserService;
+import org.springframework.web.bind.annotation.*;
+
+import java.util.List;
+
+import static java.util.stream.Collectors.toList;
+
+@RestController
+@RequestMapping("/users")
+class UserController {
+
+    private UserService userService;
+    private RoleService roleService;
+    private Mapper mapper;
+
+    public UserController(UserService userService,  RoleService roleService, Mapper mapper) {
+        this.userService = userService;
+        this.roleService = roleService;
+        this.mapper = mapper;
+    }
+
+    @GetMapping
+    @ResponseBody
+    public List<UserDTO> getUsers() {
+        return userService.getAll()
+            .stream()
+            .map(mapper::toDto)
+            .collect(toList());
+    }
+
+
+    @PostMapping
+    @ResponseBody
+    public UserIdDTO create(@RequestBody UserCreationDTO userDTO) {
+        User user = mapper.toUser(userDTO);
+
+        userDTO.getRoles()
+                .stream()
+                .map(role -> roleService.getOrCreate(role))
+                .forEach(user::addRole);
+
+        userService.save(user);
+
+        return new UserIdDTO(user.getId());
+    }
+
+}

patterns/design-patterns-architectural/src/main/java/com/baeldung/dtopattern/api/UserCreationDTO.java

@@ -0,0 +1,36 @@
+package com.baeldung.dtopattern.api;
+
+import java.util.List;
+
+public class UserCreationDTO {
+
+    private String name;
+    private String password;
+    private List<String> roles;
+
+    UserCreationDTO() {}
+
+    public String getName() {
+        return name;
+    }
+
+    public String getPassword() {
+        return password;
+    }
+
+    public List<String> getRoles() {
+        return roles;
+    }
+
+    void setName(String name) {
+        this.name = name;
+    }
+
+    void setPassword(String password) {
+        this.password = password;
+    }
+
+    void setRoles(List<String> roles) {
+        this.roles = roles;
+    }
+}

patterns/design-patterns-architectural/src/main/java/com/baeldung/dtopattern/api/UserDTO.java

@@ -0,0 +1,22 @@
+package com.baeldung.dtopattern.api;
+
+import java.util.List;
+
+public class UserDTO {
+    private String name;
+    private List<String> roles;
+
+    public UserDTO(String name, List<String> roles) {
+        this.name = name;
+        this.roles = roles;
+    }
+
+    public String getName() {
+        return name;
+    }
+
+    public List<String> getRoles() {
+        return roles;
+    }
+
+}

patterns/design-patterns-architectural/src/main/java/com/baeldung/dtopattern/api/UserIdDTO.java

@@ -0,0 +1,14 @@
+package com.baeldung.dtopattern.api;
+
+public class UserIdDTO {
+
+    private String id;
+
+    public UserIdDTO(String id) {
+        this.id = id;
+    }
+
+    public String getId() {
+        return id;
+    }
+}

patterns/design-patterns-architectural/src/main/java/com/baeldung/dtopattern/domain/InMemoryRepository.java

@@ -0,0 +1,49 @@
+package com.baeldung.dtopattern.domain;
+
+import org.springframework.stereotype.Service;
+
+import java.util.*;
+
+@Service
+class InMemoryRepository implements UserRepository, RoleRepository {
+
+    private Map<String, User> users = new LinkedHashMap<>();
+    private Map<String, Role> roles = new LinkedHashMap<>();
+
+    @Override
+    public List<User> getAll() {
+        return new ArrayList<>(users.values());
+    }
+
+    @Override
+    public void save(User user) {
+        user.setId(UUID.randomUUID().toString());
+        users.put(user.getId(), user);
+    }
+
+    @Override
+    public void save(Role role) {
+        role.setId(UUID.randomUUID().toString());
+        roles.put(role.getId(), role);
+    }
+
+    @Override
+    public Role getRoleById(String id) {
+        return roles.get(id);
+    }
+
+    @Override
+    public Role getRoleByName(String name) {
+        return roles.values()
+            .stream()
+            .filter(role -> role.getName().equalsIgnoreCase(name))
+            .findFirst()
+            .orElse(null);
+    }
+
+    @Override
+    public void deleteAll() {
+        users.clear();
+        roles.clear();
+    }
+}

patterns/design-patterns-architectural/src/main/java/com/baeldung/dtopattern/domain/Role.java

@@ -0,0 +1,28 @@
+package com.baeldung.dtopattern.domain;
+
+import java.util.Objects;
+
+public class Role {
+    private String id;
+    private String name;
+
+    public Role(String name) {
+        this.name = Objects.requireNonNull(name);
+    }
+
+    public String getId() {
+        return id;
+    }
+
+    void setId(String id) {
+        this.id = Objects.requireNonNull(id);
+    }
+
+    public String getName() {
+        return name;
+    }
+
+    public void setName(String name) {
+        this.name = Objects.requireNonNull(name);
+    }
+}

patterns/design-patterns-architectural/src/main/java/com/baeldung/dtopattern/domain/RoleRepository.java

@@ -0,0 +1,7 @@
+package com.baeldung.dtopattern.domain;
+
+public interface RoleRepository {
+    Role getRoleById(String id);
+    Role getRoleByName(String name);
+    void save(Role role);
+}

patterns/design-patterns-architectural/src/main/java/com/baeldung/dtopattern/domain/RoleService.java

@@ -0,0 +1,32 @@
+package com.baeldung.dtopattern.domain;
+
+import org.springframework.stereotype.Service;
+
+import java.util.Objects;
+
+@Service
+public class RoleService {
+
+    private RoleRepository repository;
+
+    public RoleService(RoleRepository repository) {
+        this.repository = repository;
+    }
+
+    public Role getOrCreate(String name) {
+        Role role = repository.getRoleByName(name);
+
+        if (role == null) {
+            role = new Role(name);
+            repository.save(role);
+        }
+
+        return role;
+    }
+
+    public void save(Role role) {
+        Objects.requireNonNull(role);
+        repository.save(role);
+    }
+
+}

patterns/design-patterns-architectural/src/main/java/com/baeldung/dtopattern/domain/User.java

@@ -0,0 +1,80 @@
+package com.baeldung.dtopattern.domain;
+
+import javax.crypto.*;
+import javax.crypto.spec.SecretKeySpec;
+import java.nio.charset.StandardCharsets;
+import java.security.InvalidKeyException;
+import java.security.NoSuchAlgorithmException;
+import java.util.Collections;
+import java.util.List;
+import java.util.Objects;
+
+public class User {
+
+    private static SecretKeySpec KEY = initKey();
+
+    static SecretKeySpec initKey(){
+        try {
+            SecretKey secretKey = KeyGenerator.getInstance("AES").generateKey();
+            return new SecretKeySpec(secretKey.getEncoded(), "AES");
+        } catch (NoSuchAlgorithmException ex) {
+            return null;
+        }
+    }
+
+    private String id;
+    private String name;
+    private String password;
+    private List<Role> roles;
+
+    public User(String name, String password, List<Role> roles) {
+        this.name = Objects.requireNonNull(name);
+        this.password = this.encrypt(password);
+        this.roles = Objects.requireNonNull(roles);
+    }
+
+    public String getName() {
+        return name;
+    }
+
+    public void setName(String name) {
+        this.name = name;
+    }
+
+    public String getPassword() {
+        return password;
+    }
+
+    public void setPassword(String password) {
+        this.password = password;
+    }
+
+    public void addRole(Role role) {
+        roles.add(role);
+    }
+
+    public List<Role> getRoles() {
+        return Collections.unmodifiableList(roles);
+    }
+
+    public String getId() {
+        return id;
+    }
+
+    void setId(String id) {
+        this.id = id;
+    }
+
+    String encrypt(String password) {
+        Objects.requireNonNull(password);
+        try {
+            Cipher cipher = Cipher.getInstance("AES");
+            cipher.init(Cipher.ENCRYPT_MODE, KEY);
+            final byte[] encryptedBytes = cipher.doFinal(password.getBytes(StandardCharsets.UTF_8));
+            return new String(encryptedBytes, StandardCharsets.UTF_8);
+        } catch (NoSuchAlgorithmException | NoSuchPaddingException | InvalidKeyException | IllegalBlockSizeException | BadPaddingException e) {
+            // do nothing
+            return "";
+        }
+    }
+}

patterns/design-patterns-architectural/src/main/java/com/baeldung/dtopattern/domain/UserRepository.java

@@ -0,0 +1,9 @@
+package com.baeldung.dtopattern.domain;
+
+import java.util.List;
+
+public interface UserRepository {
+    List<User> getAll();
+    void save(User user);
+    void deleteAll();
+}

patterns/design-patterns-architectural/src/main/java/com/baeldung/dtopattern/domain/UserService.java

@@ -0,0 +1,25 @@
+package com.baeldung.dtopattern.domain;
+
+import org.springframework.stereotype.Service;
+
+import java.util.List;
+import java.util.Objects;
+
+@Service
+public class UserService {
+
+    private UserRepository repository;
+
+    public UserService(UserRepository repository) {
+        this.repository = repository;
+    }
+
+    public List<User> getAll() {
+        return repository.getAll();
+    }
+
+    public void save(User user) {
+        Objects.requireNonNull(user);
+        repository.save(user);
+    }
+}

patterns/design-patterns-architectural/src/test/java/com/baeldung/dtopattern/api/MapperUnitTest.java

@@ -0,0 +1,56 @@
+package com.baeldung.dtopattern.api;
+
+import com.baeldung.dtopattern.domain.Role;
+import com.baeldung.dtopattern.domain.User;
+import org.junit.jupiter.api.Test;
+
+import java.util.ArrayList;
+import java.util.Collections;
+import java.util.List;
+
+import static org.junit.jupiter.api.Assertions.*;
+
+class MapperUnitTest {
+
+    @Test
+    void toDto_shouldMapFromDomainToDTO() {
+        String name = "Test";
+        String password = "test";
+        Role admin = new Role("admin");
+        List<String> expectedRoles = Collections.singletonList("admin");
+
+        List<Role> roles = new ArrayList<>();
+        roles.add(admin);
+
+        User user = new User(name, password, roles);
+        Mapper mapper = new Mapper();
+
+        UserDTO dto = mapper.toDto(user);
+
+        assertEquals(name, dto.getName());
+        assertEquals(expectedRoles, dto.getRoles());
+    }
+
+    @Test
+    void toUser_shouldMapFromDTOToDomain() {
+        String name = "Test";
+        String password = "test";
+        String role = "admin";
+
+        UserCreationDTO dto = new UserCreationDTO();
+        dto.setName(name);
+        dto.setPassword(password);
+        dto.setRoles(Collections.singletonList("admin"));
+
+        User expectedUser = new User(name, password, new ArrayList<>());
+
+        Mapper mapper = new Mapper();
+
+        User user = mapper.toUser(dto);
+
+        assertEquals(name, user.getName());
+        assertEquals(expectedUser.getPassword(), user.getPassword());
+        assertEquals(Collections.emptyList(), user.getRoles());
+    }
+
+}

patterns/design-patterns-architectural/src/test/java/com/baeldung/dtopattern/api/UserControllerIntegrationTest.java

@@ -0,0 +1,80 @@
+package com.baeldung.dtopattern.api;
+
+import com.baeldung.dtopattern.domain.Role;
+import com.baeldung.dtopattern.domain.RoleRepository;
+import com.baeldung.dtopattern.domain.User;
+import com.baeldung.dtopattern.domain.UserRepository;
+import com.fasterxml.jackson.databind.ObjectMapper;
+import io.restassured.http.ContentType;
+import org.junit.jupiter.api.Test;
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.boot.test.context.SpringBootTest;
+import org.springframework.boot.test.web.client.TestRestTemplate;
+import org.springframework.boot.web.server.LocalServerPort;
+
+import java.util.Collections;
+
+import static io.restassured.RestAssured.given;
+import static org.hamcrest.CoreMatchers.*;
+import static org.springframework.http.HttpStatus.OK;
+
+@SpringBootTest(webEnvironment = SpringBootTest.WebEnvironment.RANDOM_PORT)
+class UserControllerIntegrationTest {
+
+    @Autowired
+    private TestRestTemplate restTemplate;
+
+    @Autowired
+    private UserRepository userRepository;
+
+    @Autowired
+    private RoleRepository roleRepository;
+
+    @LocalServerPort
+    int port;
+
+    @Autowired
+    private ObjectMapper objectMapper;
+
+    @Test
+    void create_shouldReturnUseId() throws Exception {
+        UserCreationDTO request = new UserCreationDTO();
+        request.setName("User 1");
+        request.setPassword("Test@123456");
+        request.setRoles(Collections.singletonList("admin"));
+
+        given()
+            .contentType(ContentType.JSON)
+            .body(objectMapper.writeValueAsString(request))
+        .when()
+            .port(port)
+            .post("/users")
+        .then()
+            .statusCode(OK.value())
+            .body("id", notNullValue());
+    }
+
+    @Test
+    void getAll_shouldReturnUseDTO() {
+
+        userRepository.deleteAll();
+
+        String roleName = "admin";
+        Role admin = new Role(roleName);
+        roleRepository.save(admin);
+
+        String name = "User 1";
+        User user = new User(name, "Test@123456", Collections.singletonList(admin));
+        userRepository.save(user);
+
+        given()
+            .port(port)
+        .when()
+            .get("/users")
+        .then()
+            .statusCode(OK.value())
+            .body("size()", is(1))
+            .body("[0].name", equalTo(name))
+            .body("[0].roles", hasItem(roleName));
+    }
+}

patterns/design-patterns-architectural/src/test/java/com/baeldung/dtopattern/domain/InMemoryRepositoryUnitTest.java

@@ -0,0 +1,83 @@
+package com.baeldung.dtopattern.domain;
+
+import org.junit.jupiter.api.Test;
+
+import java.util.ArrayList;
+import java.util.Collections;
+import java.util.List;
+
+import static org.junit.jupiter.api.Assertions.assertEquals;
+import static org.junit.jupiter.api.Assertions.assertNotNull;
+
+class InMemoryRepositoryUnitTest {
+
+    @Test
+    void getAll_shouldReturnAllUsers() {
+
+        String name = "Test";
+        String password = "test123";
+        List<Role> roles = new ArrayList<>();
+
+        User user = new User(name, password, roles);
+        List<User> expectedUsers = Collections.singletonList(user);
+
+        InMemoryRepository repository = new InMemoryRepository();
+        repository.save(user);
+
+        List<User> users = repository.getAll();
+
+        assertEquals(expectedUsers, users);
+    }
+
+    @Test
+    void save_whenSavingUser_shouldSetId() {
+        String name = "Test";
+        String password = "test123";
+        List<Role> roles = new ArrayList<>();
+
+        User user = new User(name, password, roles);
+
+        InMemoryRepository repository = new InMemoryRepository();
+        repository.save(user);
+
+        assertNotNull(user.getId());
+    }
+
+    @Test
+    void save_whenSavingRole_shouldSetId() {
+        String name = "Test";
+        Role role = new Role(name);
+
+        InMemoryRepository repository = new InMemoryRepository();
+        repository.save(role);
+
+        assertNotNull(role.getId());
+    }
+
+    @Test
+    void getRoleById_shouldReturnRoleById() {
+        String name = "Test";
+        Role expectedRole = new Role(name);
+
+        InMemoryRepository repository = new InMemoryRepository();
+        repository.save(expectedRole);
+
+        Role role = repository.getRoleById(expectedRole.getId());
+
+        assertEquals(expectedRole, role);
+    }
+
+    @Test
+    void getRoleByName_shouldReturnRoleByName() {
+        String name = "Test";
+        Role expectedRole = new Role(name);
+
+        InMemoryRepository repository = new InMemoryRepository();
+        repository.save(expectedRole);
+
+        Role role = repository.getRoleByName(name);
+
+        assertEquals(expectedRole, role);
+    }
+
+}

patterns/design-patterns-architectural/src/test/java/com/baeldung/dtopattern/domain/UserUnitTest.java

@@ -0,0 +1,38 @@
+package com.baeldung.dtopattern.domain;
+
+import org.junit.jupiter.api.Test;
+
+import java.util.ArrayList;
+
+import static org.junit.jupiter.api.Assertions.*;
+
+class UserUnitTest {
+
+
+    @Test
+    void whenUserIsCreated_shouldEncryptPassword() {
+        User user = new User("Test", "test", new ArrayList<>());
+
+        assertEquals(user.encrypt("test"), user.getPassword());
+        assertNotEquals(user.encrypt("Test"), user.getPassword());
+    }
+
+    @Test
+    void whenUserIsCreated_shouldFailIfNameIsNull() {
+        assertThrows(NullPointerException.class, () ->
+            new User(null, "test", new ArrayList<>()));
+    }
+
+    @Test
+    void whenUserIsCreated_shouldFailIfPasswordIsNull() {
+        assertThrows(NullPointerException.class, () ->
+            new User("Test", null, new ArrayList<>()));
+    }
+
+    @Test
+    void whenUserIsCreated_shouldFailIfRolesIsNull() {
+        assertThrows(NullPointerException.class, () ->
+            new User("Test", "Test", null));
+    }
+
+}

persistence-modules/java-jpa-3/README.md

@@ -13,3 +13,4 @@ This module contains articles about the Java Persistence API (JPA) in Java.
 - [Returning an Auto-Generated Id with JPA](https://www.baeldung.com/jpa-get-auto-generated-id)
 - [How to Return Multiple Entities In JPA Query](https://www.baeldung.com/jpa-return-multiple-entities)
 - [Defining Unique Constraints in JPA](https://www.baeldung.com/jpa-unique-constraints)
+- [How to Check Field Existence in MongoDB?](https://www.baeldung.com/mongodb-check-field-exists)

reactor-core/README.md

@@ -11,3 +11,4 @@ This module contains articles about Reactor Core.
 - [How to Convert Mono<List<T\>> Into Flux<T\>](https://www.baeldung.com/java-mono-list-to-flux)
 - [Project Reactor: map() vs flatMap()](https://www.baeldung.com/java-reactor-map-flatmap)
 - [What Does Mono.defer() Do?](https://www.baeldung.com/java-mono-defer)
+- [Handling Exceptions in Project Reactor](https://www.baeldung.com/reactor-exceptions)

reactor-core/pom.xml

@@ -41,8 +41,8 @@
     </dependencies>
 
     <properties>
-        <reactor.version>3.3.9.RELEASE</reactor.version>
+        <reactor.version>3.4.9</reactor.version>
         <assertj.version>3.6.1</assertj.version>
     </properties>
 
-</project>
+</project>

reactor-core/src/test/java/com/baeldung/reactor/exception/ExceptionUnitTest.java

@@ -0,0 +1,89 @@
+package com.baeldung.reactor.exception;
+
+import org.junit.Test;
+import org.reactivestreams.Publisher;
+import reactor.core.publisher.Flux;
+import reactor.core.publisher.Mono;
+import reactor.core.publisher.SynchronousSink;
+import reactor.test.StepVerifier;
+
+import java.util.function.BiConsumer;
+import java.util.function.Function;
+
+public class ExceptionUnitTest {
+    @Test
+    public void givenInvalidElement_whenPipelineThrowsException_thenErrorIsSentDownstream() {
+        Function<String, Integer> mapper = input -> {
+            if (input.matches("\\D")) {
+                throw new NumberFormatException();
+            } else {
+                return Integer.parseInt(input);
+            }
+        };
+
+        Flux<String> inFlux = Flux.just("1", "1.5", "2");
+        Flux<Integer> outFlux = inFlux.map(mapper);
+
+        StepVerifier.create(outFlux)
+                .expectNext(1)
+                .expectError(NumberFormatException.class)
+                .verify();
+    }
+
+    @Test
+    public void givenInvalidElement_whenHandleCallsSinkErrorMethod_thenErrorIsSentDownstream() {
+        BiConsumer<String, SynchronousSink<Integer>> handler = (input, sink) -> {
+            if (input.matches("\\D")) {
+                sink.error(new NumberFormatException());
+            } else {
+                sink.next(Integer.parseInt(input));
+            }
+        };
+
+        Flux<String> inFlux = Flux.just("1", "1.5", "2");
+        Flux<Integer> outFlux = inFlux.handle(handler);
+
+        StepVerifier.create(outFlux)
+                .expectNext(1)
+                .expectError(NumberFormatException.class)
+                .verify();
+    }
+
+    @Test
+    public void givenInvalidElement_whenFlatMapCallsMonoErrorMethod_thenErrorIsSentDownstream() {
+        Function<String, Publisher<Integer>> mapper = input -> {
+            if (input.matches("\\D")) {
+                return Mono.error(new NumberFormatException());
+            } else {
+                return Mono.just(Integer.parseInt(input));
+            }
+        };
+
+        Flux<String> inFlux = Flux.just("1", "1.5", "2");
+        Flux<Integer> outFlux = inFlux.flatMap(mapper);
+
+        StepVerifier.create(outFlux)
+                .expectNext(1)
+                .expectError(NumberFormatException.class)
+                .verify();
+    }
+
+    @Test
+    public void givenNullElement_whenPipelineOperatorExecutes_thenNpeIsSentDownstream() {
+        Function<String, Integer> mapper = input -> {
+            if (input == null) {
+                return 0;
+            } else {
+                return Integer.parseInt(input);
+            }
+        };
+
+        Flux<String> inFlux = Flux.just("1", null, "2");
+        Flux<Integer> outFlux = inFlux.map(mapper);
+
+        StepVerifier.create(outFlux)
+                .expectNext(1)
+                .expectError(NullPointerException.class)
+                .verify();
+    }
+}

spring-kafka/README.md

@@ -8,6 +8,7 @@ This module contains articles about Spring with Kafka
 - [Testing Kafka and Spring Boot](https://www.baeldung.com/spring-boot-kafka-testing)
 - [Monitor the Consumer Lag in Apache Kafka](https://www.baeldung.com/java-kafka-consumer-lag)
 - [Send Large Messages With Kafka](https://www.baeldung.com/java-kafka-send-large-message)
+- [Configuring Kafka SSL Using Spring Boot](https://www.baeldung.com/spring-boot-kafka-ssl)
 
 ### Intro
 

spring-kafka/pom.xml

@@ -28,6 +28,10 @@
             <groupId>com.fasterxml.jackson.core</groupId>
             <artifactId>jackson-databind</artifactId>
         </dependency>
+        <dependency>
+            <groupId>org.projectlombok</groupId>
+            <artifactId>lombok</artifactId>
+        </dependency>
         <dependency>
             <groupId>org.springframework.kafka</groupId>
             <artifactId>spring-kafka-test</artifactId>
@@ -41,9 +45,15 @@
             <scope>test</scope>
         </dependency>
         <dependency>
-            <groupId>commons-collections</groupId>
-            <artifactId>commons-collections</artifactId>
-            <version>3.2.1</version>
+            <groupId>org.testcontainers</groupId>
+            <artifactId>junit-jupiter</artifactId>
+            <version>${testcontainers-kafka.version}</version>
+            <scope>test</scope>
+        </dependency>
+        <dependency>
+            <groupId>org.awaitility</groupId>
+            <artifactId>awaitility</artifactId>
+            <scope>test</scope>
         </dependency>
     </dependencies>
 

spring-kafka/src/main/java/com/baeldung/kafka/ssl/KafkaConsumer.java

@@ -0,0 +1,25 @@
+package com.baeldung.kafka.ssl;
+
+import lombok.extern.slf4j.Slf4j;
+import org.apache.kafka.clients.consumer.ConsumerRecord;
+import org.springframework.kafka.annotation.KafkaListener;
+import org.springframework.stereotype.Component;
+
+import java.util.ArrayList;
+import java.util.List;
+
+@Component
+@Slf4j
+public class KafkaConsumer {
+
+    public static final String TOPIC = "test-topic";
+
+    public final List<String> messages = new ArrayList<>();
+
+    @KafkaListener(topics = TOPIC)
+    public void receive(ConsumerRecord<String, String> consumerRecord) {
+        log.info("Received payload: '{}'", consumerRecord.toString());
+        messages.add(consumerRecord.value());
+    }
+
+}

spring-kafka/src/main/java/com/baeldung/kafka/ssl/KafkaProducer.java

@@ -0,0 +1,23 @@
+package com.baeldung.kafka.ssl;
+
+import lombok.AllArgsConstructor;
+import lombok.extern.slf4j.Slf4j;
+import org.springframework.kafka.core.KafkaTemplate;
+import org.springframework.stereotype.Component;
+
+@Slf4j
+@AllArgsConstructor
+@Component
+public class KafkaProducer {
+
+    private final KafkaTemplate<String, String> kafkaTemplate;
+
+    public void sendMessage(String message, String topic) {
+        log.info("Producing message: {}", message);
+        kafkaTemplate.send(topic, "key", message)
+          .addCallback(
+            result -> log.info("Message sent to topic: {}", message),
+            ex -> log.error("Failed to send message", ex)
+          );
+    }
+}

spring-kafka/src/main/java/com/baeldung/kafka/ssl/KafkaSslApplication.java

@@ -0,0 +1,15 @@
+package com.baeldung.kafka.ssl;
+
+import org.springframework.boot.SpringApplication;
+import org.springframework.boot.autoconfigure.EnableAutoConfiguration;
+import org.springframework.boot.autoconfigure.SpringBootApplication;
+
+@SpringBootApplication
+@EnableAutoConfiguration
+public class KafkaSslApplication {
+
+    public static void main(String[] args) {
+        SpringApplication.run(KafkaSslApplication.class, args);
+    }
+
+}

spring-kafka/src/main/resources/application-ssl.yml

@@ -0,0 +1,18 @@
+spring:
+  kafka:
+    security:
+      protocol: "SSL"
+    bootstrap-servers: localhost:9093
+    ssl:
+      trust-store-location: classpath:/client-certs/kafka.client.truststore.jks
+      trust-store-password: password
+      key-store-location:  classpath:/client-certs/kafka.client.keystore.jks
+      key-store-password: password
+    consumer:
+      group-id: demo-group-id
+      auto-offset-reset: earliest
+      key-deserializer: org.apache.kafka.common.serialization.StringDeserializer
+      value-deserializer: org.apache.kafka.common.serialization.StringDeserializer
+    producer:
+      key-deserializer: org.apache.kafka.common.serialization.StringDeserializer
+      value-deserializer: org.apache.kafka.common.serialization.StringDeserializer

spring-kafka/src/test/java/com/baeldung/kafka/ssl/KafkaSslApplicationLiveTest.java

@@ -0,0 +1,54 @@
+package com.baeldung.kafka.ssl;
+
+import lombok.extern.slf4j.Slf4j;
+import org.junit.jupiter.api.Test;
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.boot.test.context.SpringBootTest;
+import org.springframework.test.context.ActiveProfiles;
+import org.testcontainers.containers.DockerComposeContainer;
+import org.testcontainers.containers.wait.strategy.Wait;
+import org.testcontainers.junit.jupiter.Container;
+import org.testcontainers.junit.jupiter.Testcontainers;
+
+import java.io.File;
+import java.time.Duration;
+import java.util.UUID;
+
+import static com.baeldung.kafka.ssl.KafkaConsumer.TOPIC;
+import static org.assertj.core.api.Assertions.assertThat;
+import static org.awaitility.Awaitility.await;
+
+@Slf4j
+@ActiveProfiles("ssl")
+@Testcontainers
+@SpringBootTest(classes = KafkaSslApplication.class)
+class KafkaSslApplicationLiveTest {
+
+    private static final File KAFKA_COMPOSE_FILE = new File("src/test/resources/docker/docker-compose.yml");
+    private static final String KAFKA_SERVICE = "kafka";
+    private static final int SSL_PORT = 9093;
+
+    @Container
+    public DockerComposeContainer<?> container =
+      new DockerComposeContainer<>(KAFKA_COMPOSE_FILE)
+        .withExposedService(KAFKA_SERVICE, SSL_PORT, Wait.forListeningPort());
+
+    @Autowired
+    private KafkaProducer kafkaProducer;
+
+    @Autowired
+    private KafkaConsumer kafkaConsumer;
+
+    @Test
+    void givenSslIsConfigured_whenProducerSendsMessageOverSsl_thenConsumerReceivesOverSsl() {
+        String message = generateSampleMessage();
+        kafkaProducer.sendMessage(message, TOPIC);
+
+        await().atMost(Duration.ofMinutes(2))
+          .untilAsserted(() -> assertThat(kafkaConsumer.messages).containsExactly(message));
+    }
+
+    private static String generateSampleMessage() {
+        return UUID.randomUUID().toString();
+    }
+}

spring-kafka/src/test/resources/docker/certs/kafka_keystore_credentials

@@ -0,0 +1 @@
+password

spring-kafka/src/test/resources/docker/certs/kafka_sslkey_credentials

@@ -0,0 +1 @@
+password

spring-kafka/src/test/resources/docker/certs/kafka_truststore_credentials

@@ -0,0 +1 @@
+password