Merge pull request #30 from eugenp/master

update

algorithms-miscellaneous-2/README.md

@@ -13,4 +13,5 @@ This module contains articles about algorithms. Some classes of algorithms, e.g.
 - [Create a Sudoku Solver in Java](https://www.baeldung.com/java-sudoku)
 - [Displaying Money Amounts in Words](https://www.baeldung.com/java-money-into-words)
 - [A Collaborative Filtering Recommendation System in Java](https://www.baeldung.com/java-collaborative-filtering-recommendations)
+- [Implementing A* Pathfinding in Java](https://www.baeldung.com/java-a-star-pathfinding)
 - More articles: [[<-- prev]](/../algorithms-miscellaneous-1) [[next -->]](/../algorithms-miscellaneous-3)

algorithms-miscellaneous-5/README.md

@@ -12,4 +12,5 @@ This module contains articles about algorithms. Some classes of algorithms, e.g.
 - [How to Determine if a Binary Tree is Balanced](https://www.baeldung.com/java-balanced-binary-tree)
 - [The Caesar Cipher in Java](https://www.baeldung.com/java-caesar-cipher)
 - [Overview of Combinatorial Problems in Java](https://www.baeldung.com/java-combinatorial-algorithms)
+- [Prim’s Algorithm](https://www.baeldung.com/java-prim-algorithm)
 - More articles: [[<-- prev]](/../algorithms-miscellaneous-4)

apache-spark/README.md

@@ -7,4 +7,4 @@ This module contains articles about Apache Spark
 - [Introduction to Apache Spark](https://www.baeldung.com/apache-spark)
 - [Building a Data Pipeline with Kafka, Spark Streaming and Cassandra](https://www.baeldung.com/kafka-spark-data-pipeline)
 - [Machine Learning with Spark MLlib](https://www.baeldung.com/spark-mlib-machine-learning)
-
+- [Introduction to Spark Graph Processing with GraphFrames](https://www.baeldung.com/spark-graph-graphframes)

apache-tapestry/README.md

@@ -0,0 +1,3 @@
+### Relevant Articles
+
+- [Intro to Apache Tapestry](https://www.baeldung.com/apache-tapestry)

core-groovy-2/pom.xml

@@ -77,7 +77,7 @@
                     <dependency>
                         <groupId>org.codehaus.groovy</groupId>
                         <artifactId>groovy-eclipse-compiler</artifactId>
-                        <version>3.3.0-01</version>
+                        <version>${groovy.compiler.version}</version>
                     </dependency>
                     <dependency>
                         <groupId>org.codehaus.groovy</groupId>

core-groovy-2/src/test/groovy/com/baeldung/category/CategoryUnitTest.groovy

@@ -28,17 +28,16 @@ class CategoryUnitTest extends GroovyTestCase {
         }
     }
 
-//	http://team.baeldung.com/browse/BAEL-20687
-//    void test_whenUsingTimeCategory_thenOperationOnNumber() {
-//        SimpleDateFormat sdf = new SimpleDateFormat("dd/MM/yyyy")
-//        use (TimeCategory) {
-//            assert sdf.format(5.days.from.now) == sdf.format(new Date() + 5.days)
-//
-//            sdf = new SimpleDateFormat("dd/MM/yyyy hh:mm:ss")
-//            assert sdf.format(10.minutes.from.now) == sdf.format(new Date() + 10.minutes)
-//            assert sdf.format(2.hours.ago) == sdf.format(new Date() - 2.hours)
-//        }
-//    }
+    void test_whenUsingTimeCategory_thenOperationOnNumber() {
+        SimpleDateFormat sdf = new SimpleDateFormat("dd/MM/yyyy")
+        use (TimeCategory) {
+            assert sdf.format(5.days.from.now) == sdf.format(new Date() + 5.days)
+
+            sdf = new SimpleDateFormat("dd/MM/yyyy hh:mm:ss")
+            assert sdf.format(10.minutes.from.now) == sdf.format(new Date() + 10.minutes)
+            assert sdf.format(2.hours.ago) == sdf.format(new Date() - 2.hours)
+        }
+    }
 
     void test_whenUsingDOMCategory_thenOperationOnXML() {
 

core-groovy-2/src/test/groovy/com/baeldung/webservice/WebserviceUnitTest.groovy

@@ -75,7 +75,6 @@ class WebserviceManualTest extends GroovyTestCase {
         assert stories.size() == 5
     }
     
-    /* see BAEL-3753
     void test_whenConsumingSoap_thenReceiveResponse() {
         def url = "http://www.dataaccess.com/webservicesserver/numberconversion.wso"
         def soapClient = new SOAPClient(url)
@@ -90,7 +89,6 @@ class WebserviceManualTest extends GroovyTestCase {
         def words = response.NumberToWordsResponse
         assert words == "one thousand two hundred and thirty four "
     }
-    */
 
     void test_whenConsumingRestGet_thenReceiveResponse() {
         def path = "/get"

core-groovy/src/test/groovy/com/baeldung/file/ReadFileUnitTest.groovy

@@ -33,7 +33,6 @@ class ReadFileUnitTest extends Specification {
             assert lines.size(), 3
     }
     
-    @Ignore
     def 'Should return file content in string using ReadFile.readFileString given filePath' () {
         given:
             def filePath = "src/main/resources/fileContent.txt"

core-java-modules/core-java-11/pom.xml

@@ -65,7 +65,7 @@
             <plugin>
                 <groupId>org.apache.maven.plugins</groupId>
                 <artifactId>maven-shade-plugin</artifactId>
-                <version>3.2.1</version>
+                <version>${shade.plugin.version}</version>
                 <executions>
                     <execution>
                         <phase>package</phase>
@@ -109,6 +109,7 @@
         <uberjar.name>benchmarks</uberjar.name>
         <jmh.version>1.22</jmh.version>
         <eclipse.collections.version>10.0.0</eclipse.collections.version>
+        <shade.plugin.version>10.0.0</shade.plugin.version>
     </properties>
 
 </project>

core-java-modules/core-java-13/README.md

@@ -0,0 +1,3 @@
+### Relevant articles:
+
+- [Java Switch Statement](https://www.baeldung.com/java-switch)

core-java-modules/core-java-9/README.md

@@ -9,6 +9,7 @@ This module contains articles about Java 9 core features
 - [Iterate Through a Range of Dates in Java](https://www.baeldung.com/java-iterate-date-range)
 - [Initialize a HashMap in Java](https://www.baeldung.com/java-initialize-hashmap)
 - [Immutable Set in Java](https://www.baeldung.com/java-immutable-set)
+- [Immutable ArrayList in Java](https://www.baeldung.com/java-immutable-list)
 
 Note: also contains part of the code for the article
 [How to Filter a Collection in Java](https://www.baeldung.com/java-collection-filtering).

core-java-modules/core-java-9/pom.xml

@@ -37,6 +37,11 @@
             <version>${junit.platform.version}</version>
             <scope>test</scope>
         </dependency>
+        <dependency>
+            <groupId>org.apache.commons</groupId>
+            <artifactId>commons-collections4</artifactId>
+            <version>${commons-collections4.version}</version>
+        </dependency>
     </dependencies>
 
     <build>
@@ -69,6 +74,7 @@
         <maven.compiler.source>1.9</maven.compiler.source>
         <maven.compiler.target>1.9</maven.compiler.target>
         <guava.version>25.1-jre</guava.version>
+        <commons-collections4.version>4.1</commons-collections4.version>
     </properties>
 
 </project>

core-java-modules/core-java-9/src/test/java/com/baeldung/java9/list/immutable/ImmutableArrayListUnitTest.java

@@ -0,0 +1,48 @@
+package com.baeldung.java9.list.immutable;
+
+import com.google.common.collect.ImmutableList;
+import org.apache.commons.collections4.ListUtils;
+import org.junit.Test;
+
+import java.util.ArrayList;
+import java.util.Arrays;
+import java.util.Collections;
+import java.util.List;
+
+public class ImmutableArrayListUnitTest {
+
+    @Test(expected = UnsupportedOperationException.class)
+    public final void givenUsingTheJdk_whenUnmodifiableListIsCreated_thenNotModifiable() {
+        final List<String> list = new ArrayList<>(Arrays.asList("one", "two", "three"));
+        final List<String> unmodifiableList = Collections.unmodifiableList(list);
+        unmodifiableList.add("four");
+    }
+
+    @Test(expected = UnsupportedOperationException.class)
+    public final void givenUsingTheJava9_whenUnmodifiableListIsCreated_thenNotModifiable() {
+        final List<String> list = new ArrayList<>(Arrays.asList("one", "two", "three"));
+        final List<String> unmodifiableList = List.of(list.toArray(new String[]{}));
+        unmodifiableList.add("four");
+    }
+
+    @Test(expected = UnsupportedOperationException.class)
+    public final void givenUsingGuava_whenUnmodifiableListIsCreated_thenNotModifiable() {
+        final List<String> list = new ArrayList<>(Arrays.asList("one", "two", "three"));
+        final List<String> unmodifiableList = ImmutableList.copyOf(list);
+        unmodifiableList.add("four");
+    }
+
+    @Test(expected = UnsupportedOperationException.class)
+    public final void givenUsingGuavaBuilder_whenUnmodifiableListIsCreated_thenNoLongerModifiable() {
+        final List<String> list = new ArrayList<>(Arrays.asList("one", "two", "three"));
+        final ImmutableList<String> unmodifiableList = ImmutableList.<String>builder().addAll(list).build();
+        unmodifiableList.add("four");
+    }
+
+    @Test(expected = UnsupportedOperationException.class)
+    public final void givenUsingCommonsCollections_whenUnmodifiableListIsCreated_thenNotModifiable() {
+        final List<String> list = new ArrayList<>(Arrays.asList("one", "two", "three"));
+        final List<String> unmodifiableList = ListUtils.unmodifiableList(list);
+        unmodifiableList.add("four");
+    }
+}

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

@@ -3,9 +3,8 @@
 This module contains articles about the Java ArrayList collection
 
 ### Relevant Articles: 
-- [Immutable ArrayList in Java](http://www.baeldung.com/java-immutable-list)
-- [Guide to the Java ArrayList](http://www.baeldung.com/java-arraylist)
-- [Add Multiple Items to an Java ArrayList](http://www.baeldung.com/java-add-items-array-list)
+- [Guide to the Java ArrayList](https://www.baeldung.com/java-arraylist)
+- [Add Multiple Items to an Java ArrayList](https://www.baeldung.com/java-add-items-array-list)
 - [ClassCastException: Arrays$ArrayList cannot be cast to ArrayList](https://www.baeldung.com/java-classcastexception-arrays-arraylist)
 - [Multi Dimensional ArrayList in Java](https://www.baeldung.com/java-multi-dimensional-arraylist)
 - [Removing an Element From an ArrayList](https://www.baeldung.com/java-arraylist-remove-element)

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

@@ -15,42 +15,11 @@ public class CoreJavaCollectionsUnitTest {
 
     private static final Logger LOG = LoggerFactory.getLogger(CoreJavaCollectionsUnitTest.class);
 
-
-    // tests -
-
     @Test
     public final void givenUsingTheJdk_whenArrayListIsSynchronized_thenCorrect() {
-        final List<String> list = new ArrayList<String>(Arrays.asList("one", "two", "three"));
+        final List<String> list = new ArrayList<>(Arrays.asList("one", "two", "three"));
         final List<String> synchronizedList = Collections.synchronizedList(list);
         LOG.debug("Synchronized List is: " + synchronizedList);
     }
 
-    @Test(expected = UnsupportedOperationException.class)
-    public final void givenUsingTheJdk_whenUnmodifiableListIsCreatedFromOriginal_thenNoLongerModifiable() {
-        final List<String> list = new ArrayList<String>(Arrays.asList("one", "two", "three"));
-        final List<String> unmodifiableList = Collections.unmodifiableList(list);
-        unmodifiableList.add("four");
-    }
-
-    @Test(expected = UnsupportedOperationException.class)
-    public final void givenUsingGuava_whenUnmodifiableListIsCreatedFromOriginal_thenNoLongerModifiable() {
-        final List<String> list = new ArrayList<String>(Arrays.asList("one", "two", "three"));
-        final List<String> unmodifiableList = ImmutableList.copyOf(list);
-        unmodifiableList.add("four");
-    }
-
-    @Test(expected = UnsupportedOperationException.class)
-    public final void givenUsingGuavaBuilder_whenUnmodifiableListIsCreatedFromOriginal_thenNoLongerModifiable() {
-        final List<String> list = new ArrayList<String>(Arrays.asList("one", "two", "three"));
-        final ImmutableList<String> unmodifiableList = ImmutableList.<String>builder().addAll(list).build();
-        unmodifiableList.add("four");
-    }
-
-    @Test(expected = UnsupportedOperationException.class)
-    public final void givenUsingCommonsCollections_whenUnmodifiableListIsCreatedFromOriginal_thenNoLongerModifiable() {
-        final List<String> list = new ArrayList<String>(Arrays.asList("one", "two", "three"));
-        final List<String> unmodifiableList = ListUtils.unmodifiableList(list);
-        unmodifiableList.add("four");
-    }
-
 }

core-java-modules/core-java-concurrency-advanced-2/src/main/java/com/baeldung/threadlocalrandom/ThreadLocalRandomBenchMarkRunner.java

@@ -1,22 +1,27 @@
 package com.baeldung.threadlocalrandom;
 
 import org.openjdk.jmh.runner.Runner;
-import org.openjdk.jmh.runner.options.Options;
+import org.openjdk.jmh.runner.options.ChainedOptionsBuilder;
 import org.openjdk.jmh.runner.options.OptionsBuilder;
 
+import com.google.common.collect.ImmutableList;
+
 public class ThreadLocalRandomBenchMarkRunner {
 
     public static void main(String[] args) throws Exception {
 
-        Options options = new OptionsBuilder().include(ThreadLocalRandomBenchMarker.class.getSimpleName())
-            .threads(1)
+        ChainedOptionsBuilder options = new OptionsBuilder().include(ThreadLocalRandomBenchMarker.class.getSimpleName())
             .forks(1)
             .shouldFailOnError(true)
             .shouldDoGC(true)
-            .jvmArgs("-server")
-            .build();
-
-        new Runner(options).run();
+            .jvmArgs("-server");
 
+        for (Integer i : ImmutableList.of(1, 2, 8, 32)) {
+            new Runner(
+                    options
+                            .threads(i)
+                            .build())
+                    .run();
+        }
     }
 }

core-java-modules/core-java-concurrency-advanced-2/src/main/java/com/baeldung/threadlocalrandom/ThreadLocalRandomBenchMarker.java

@@ -1,64 +1,34 @@
 package com.baeldung.threadlocalrandom;
 
-import java.util.ArrayList;
-import java.util.List;
 import java.util.Random;
-import java.util.concurrent.Callable;
-import java.util.concurrent.ExecutorService;
-import java.util.concurrent.Executors;
 import java.util.concurrent.ThreadLocalRandom;
 import java.util.concurrent.TimeUnit;
 
 import org.openjdk.jmh.annotations.Benchmark;
 import org.openjdk.jmh.annotations.BenchmarkMode;
-import org.openjdk.jmh.annotations.Level;
 import org.openjdk.jmh.annotations.Mode;
 import org.openjdk.jmh.annotations.OutputTimeUnit;
 import org.openjdk.jmh.annotations.Scope;
-import org.openjdk.jmh.annotations.Setup;
 import org.openjdk.jmh.annotations.State;
 import org.openjdk.jmh.annotations.Warmup;
 
-@BenchmarkMode(Mode.AverageTime)
+@BenchmarkMode(Mode.Throughput)
 @Warmup(iterations = 1)
 @OutputTimeUnit(TimeUnit.MICROSECONDS)
 @State(Scope.Benchmark)
 public class ThreadLocalRandomBenchMarker {
+    private final Random random = new Random();
 
-    List<Callable<Integer>> randomCallables = new ArrayList<>();
-    List<Callable<Integer>> threadLocalRandomCallables = new ArrayList<>();
-
-    @Setup(Level.Iteration)
-    public void init() {
-        Random random = new Random();
-        randomCallables = new ArrayList<>();
-        threadLocalRandomCallables = new ArrayList<>();
-        for (int i = 0; i < 1000; i++) {
-            randomCallables.add(() -> {
+    @Benchmark
+    public int randomValuesUsingRandom() {
         return random.nextInt();
-            });
     }
 
-        for (int i = 0; i < 1000; i++) {
-            threadLocalRandomCallables.add(() -> {
-                return ThreadLocalRandom.current()
+    @Benchmark
+    public int randomValuesUsingThreadLocalRandom() {
+        return ThreadLocalRandom
+                .current()
                 .nextInt();
-            });
-        }
-    }
-
-    @Benchmark
-    public void randomValuesUsingRandom() throws InterruptedException {
-        ExecutorService executor = Executors.newWorkStealingPool();
-        executor.invokeAll(randomCallables);
-        executor.shutdown();
-    }
-
-    @Benchmark
-    public void randomValuesUsingThreadLocalRandom() throws InterruptedException {
-        ExecutorService executor = Executors.newWorkStealingPool();
-        executor.invokeAll(threadLocalRandomCallables);
-        executor.shutdown();
     }
 
 }

core-java-modules/core-java-exceptions-2/README.md

@@ -2,4 +2,6 @@
 
 This module contains articles about core java exceptions
 
-###
+### Relevant Articles:
+
+- [Is It a Bad Practice to Catch Throwable?](https://www.baeldung.com/java-catch-throwable-bad-practice)

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

@@ -13,4 +13,5 @@ This module contains articles about core Java input and output (IO)
 - [Getting a File’s Mime Type in Java](https://www.baeldung.com/java-file-mime-type)
 - [How to Write to a CSV File in Java](https://www.baeldung.com/java-csv)
 - [How to Avoid the Java FileNotFoundException When Loading Resources](https://www.baeldung.com/java-classpath-resource-cannot-be-opened)
+- [Create a Directory in Java](https://www.baeldung.com/java-create-directory)
 - [[More -->]](/core-java-modules/core-java-io-2)

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

@@ -10,3 +10,5 @@ This module contains articles about working with the Java Virtual Machine (JVM).
 - [Class Loaders in Java](https://www.baeldung.com/java-classloaders)
 - [A Guide to System.exit()](https://www.baeldung.com/java-system-exit)
 - [Guide to System.gc()](https://www.baeldung.com/java-system-gc)
+- [Runtime.getRuntime().halt() vs System.exit() in Java](https://www.baeldung.com/java-runtime-halt-vs-system-exit)
+- [Adding Shutdown Hooks for JVM Applications](https://www.baeldung.com/jvm-shutdown-hooks)

core-java-modules/core-java-lang-oop-3/README.md

@@ -8,7 +8,7 @@ This module contains articles about Object-oriented programming (OOP) in Java
 - [Guide to the super Java Keyword](https://www.baeldung.com/java-super)
 - [Guide to the this Java Keyword](https://www.baeldung.com/java-this)
 - [Java ‘public’ Access Modifier](https://www.baeldung.com/java-public-keyword)
-- [Composition, Aggregation and Association in Java](https://www.baeldung.com/java-composition-aggregation-association)
+- [Composition, Aggregation, and Association in Java](https://www.baeldung.com/java-composition-aggregation-association)
 - [Nested Classes in Java](https://www.baeldung.com/java-nested-classes)
 - [A Guide to Inner Interfaces in Java](https://www.baeldung.com/java-inner-interfaces)
 - [Java Classes and Objects](https://www.baeldung.com/java-classes-objects)

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

@@ -9,3 +9,4 @@ This module contains articles about performance of Java applications
 - [OutOfMemoryError: GC Overhead Limit Exceeded](http://www.baeldung.com/java-gc-overhead-limit-exceeded)
 - [Basic Introduction to JMX](http://www.baeldung.com/java-management-extensions)
 - [Monitoring Java Applications with Flight Recorder](https://www.baeldung.com/java-flight-recorder-monitoring)
+- [Branch Prediction in Java](https://www.baeldung.com/java-branch-prediction)

core-java-modules/core-java-string-algorithms-3/README.md

@@ -3,3 +3,5 @@
 This module contains articles about string-related algorithms.
 
 ### Relevant Articles:
+
+- [Check if Two Strings are Anagrams in Java](https://www.baeldung.com/java-strings-anagrams)

data-structures/README.md

@@ -6,3 +6,4 @@ This module contains articles about data structures in Java
 
 - [The Trie Data Structure in Java](https://www.baeldung.com/trie-java)
 - [Implementing a Binary Tree in Java](https://www.baeldung.com/java-binary-tree)
+- [Circular Linked List Java Implementation](https://www.baeldung.com/java-circular-linked-list)

data-structures/pom.xml

@@ -23,7 +23,7 @@
         <dependency>
             <groupId>com.leansoft</groupId>
             <artifactId>bigqueue</artifactId>
-            <version>0.7.0</version>
+            <version>${bigqueue.version}</version>
         </dependency>
     </dependencies>
 
@@ -39,4 +39,8 @@
         </pluginManagement>
     </build>
 
+    <properties>
+        <bigqueue.version>0.7.0</bigqueue.version>
+    </properties>
+
 </project>

ethereum/pom.xml

@@ -177,8 +177,8 @@
                 <artifactId>maven-compiler-plugin</artifactId>
                 <version>${compiler.plugin.version}</version>
                 <configuration>
-                    <source>${source.version}</source>
-                    <target>${target.version}</target>
+                    <source>${java.version}</source>
+                    <target>${java.version}</target>
                 </configuration>
             </plugin>
             <plugin>
@@ -189,7 +189,7 @@
             <plugin>
                 <groupId>org.apache.maven.plugins</groupId>
                 <artifactId>maven-war-plugin</artifactId>
-                <version>3.0.0</version>
+                <version>${maven-war-plugin.version}</version>
                 <configuration>
                     <warSourceDirectory>src/main/webapp</warSourceDirectory>
                     <failOnMissingWebXml>false</failOnMissingWebXml>
@@ -216,7 +216,5 @@
         <slf4j.version>1.7.25</slf4j.version>
         <spring-boot-maven-plugin.version>2.0.4.RELEASE</spring-boot-maven-plugin.version>
         <compiler.plugin.version>3.1</compiler.plugin.version>
-        <source.version>1.8</source.version>
-        <target.version>1.8</target.version>
     </properties>
 </project>

intelliJ/remote-debugging/README.adoc

@@ -1,85 +0,0 @@
-:toc:
-:spring_version: current
-:icons: font
-:source-highlighter: prettify
-:project_id: gs-scheduling-tasks
-This guide walks you through the steps for scheduling tasks with Spring.
-
-== What you'll build
-
-You'll build an application that prints out the current time every five seconds using Spring's `@Scheduled` annotation.
-
-== What you'll need
-
-:java_version: 1.8
-include::https://raw.githubusercontent.com/spring-guides/getting-started-macros/master/prereq_editor_jdk_buildtools.adoc[]
-
-
-include::https://raw.githubusercontent.com/spring-guides/getting-started-macros/master/how_to_complete_this_guide.adoc[]
-
-
-include::https://raw.githubusercontent.com/spring-guides/getting-started-macros/master/hide-show-gradle.adoc[]
-
-include::https://raw.githubusercontent.com/spring-guides/getting-started-macros/master/hide-show-maven.adoc[]
-
-include::https://raw.githubusercontent.com/spring-guides/getting-started-macros/master/hide-show-sts.adoc[]
-
-
-
-[[initial]]
-== Create a scheduled task
-Now that you've set up your project, you can create a scheduled task.
-
-`src/main/java/hello/ScheduledTasks.java`
-[source,java]
-----
-include::complete/src/main/java/hello/ScheduledTasks.java[]
-----
-
-The `Scheduled` annotation defines when a particular method runs.
-NOTE: This example uses `fixedRate`, which specifies the interval between method invocations measured from the start time of each invocation. There are https://docs.spring.io/spring/docs/{spring_version}/spring-framework-reference/html/scheduling.html#scheduling-annotation-support-scheduled[other options], like `fixedDelay`, which specifies the interval between invocations measured from the completion of the task. You can also https://docs.spring.io/spring/docs/{spring_version}/javadoc-api/org/springframework/scheduling/support/CronSequenceGenerator.html[use `@Scheduled(cron=". . .")` expressions for more sophisticated task scheduling].
-
-== Enable Scheduling
-
-Although scheduled tasks can be embedded in web apps and WAR files, the simpler approach demonstrated below creates a standalone application. You package everything in a single, executable JAR file, driven by a good old Java `main()` method.
-
-`src/main/java/hello/Application.java`
-[source,java]
-----
-include::complete/src/main/java/hello/Application.java[]
-----
-
-include::https://raw.githubusercontent.com/spring-guides/getting-started-macros/master/spring-boot-application.adoc[]
-
-https://docs.spring.io/spring/docs/current/spring-framework-reference/htmlsingle/#scheduling-enable-annotation-support[`@EnableScheduling`] ensures that a background task executor is created. Without it, nothing gets scheduled.
-
-
-include::https://raw.githubusercontent.com/spring-guides/getting-started-macros/master/build_an_executable_jar_subhead.adoc[]
-
-include::https://raw.githubusercontent.com/spring-guides/getting-started-macros/master/build_an_executable_jar_with_both.adoc[]
-
-
-
-Logging output is displayed and you can see from the logs that it is on a background thread. You should see your scheduled task fire every 5 seconds:
-
-....
-[...]
-2016-08-25 13:10:00.143  INFO 31565 --- [pool-1-thread-1] hello.ScheduledTasks : The time is now 13:10:00
-2016-08-25 13:10:05.143  INFO 31565 --- [pool-1-thread-1] hello.ScheduledTasks : The time is now 13:10:05
-2016-08-25 13:10:10.143  INFO 31565 --- [pool-1-thread-1] hello.ScheduledTasks : The time is now 13:10:10
-2016-08-25 13:10:15.143  INFO 31565 --- [pool-1-thread-1] hello.ScheduledTasks : The time is now 13:10:15
-....
-
-== Summary
-
-Congratulations! You created an application with a scheduled task. Heck, the actual code was shorter than the build file! This technique works in any type of application.
-
-== See Also
-
-The following guides may also be helpful:
-
-* https://spring.io/guides/gs/spring-boot/[Building an Application with Spring Boot]
-* https://spring.io/guides/gs/batch-processing/[Creating a Batch Service]
-
-include::https://raw.githubusercontent.com/spring-guides/getting-started-macros/master/footer.adoc[]
-

intelliJ/remote-debugging/README.md

@@ -0,0 +1,3 @@
+### Relevant Articles:
+
+- [Remote Debugging with IntelliJ IDEA](https://www.baeldung.com/intellij-remote-debugging)

java-ee-8-security-api/README.md

@@ -4,4 +4,4 @@ This module contains articles about the Security API in Java EE 8.
 
 ### Relevant articles
  
- - [Java EE 8 Security API](https://www.baeldung.com/java-ee-8-security)
+ - [Jakarta EE 8 Security API](https://www.baeldung.com/java-ee-8-security)

java-numbers-2/README.md

@@ -15,4 +15,5 @@ This module contains articles about numbers in Java.
 - [Binary Numbers in Java](https://www.baeldung.com/java-binary-numbers)
 - [Generating Random Numbers in a Range in Java](https://www.baeldung.com/java-generating-random-numbers)
 - [Listing Numbers Within a Range in Java](https://www.baeldung.com/java-listing-numbers-within-a-range)
+- [Fibonacci Series in Java](https://www.baeldung.com/java-fibonacci)
 - More articles: [[<-- prev]](/../java-numbers)

java-numbers-3/pom.xml

@@ -17,7 +17,7 @@
     	<dependency>
             <groupId>it.unimi.dsi</groupId>
             <artifactId>dsiutils</artifactId>
-            <version>2.6.0</version>
+            <version>${dsiutils.version}</version>
         </dependency>
     </dependencies>
    
@@ -31,4 +31,8 @@
         </resources>
     </build>
 
+    <properties>
+        <dsiutils.version>2.6.0</dsiutils.version>
+    </properties>
+
 </project>

javax-servlets/README.md

@@ -9,6 +9,6 @@ This module contains articles about Servlets.
 - [Uploading Files with Servlets and JSP](https://www.baeldung.com/upload-file-servlet)
 - [Example of Downloading File in a Servlet](https://www.baeldung.com/servlet-download-file)
 - [Returning a JSON Response from a Servlet](https://www.baeldung.com/servlet-json-response)
-- [Java EE Servlet Exception Handling](https://www.baeldung.com/servlet-exceptions)
+- [Jakarta EE Servlet Exception Handling](https://www.baeldung.com/servlet-exceptions)
 - [Context and Servlet Initialization Parameters](https://www.baeldung.com/context-servlet-initialization-param)
 - [The Difference between getRequestURI and getPathInfo in HttpServletRequest](https://www.baeldung.com/http-servlet-request-requesturi-pathinfo)

jee-7-security/README.md

@@ -3,4 +3,4 @@
 This module contains articles about security in JEE 7.
 
 ### Relevant Articles:
-- [Securing Java EE with Spring Security](https://www.baeldung.com/java-ee-spring-security)
+- [Securing Jakarta EE with Spring Security](https://www.baeldung.com/java-ee-spring-security)

jee-7/README.md

@@ -3,7 +3,7 @@
 This module contains articles about JEE 7.
 
 ### Relevant Articles:
-- [Scheduling in Java EE](https://www.baeldung.com/scheduling-in-java-enterprise-edition)
+- [Scheduling in Jakarta EE](https://www.baeldung.com/scheduling-in-java-enterprise-edition)
 - [JSON Processing in Java EE 7](https://www.baeldung.com/jee7-json)
 - [Converters, Listeners and Validators in Java EE 7](https://www.baeldung.com/java-ee7-converter-listener-validator)
 - [Introduction to JAX-WS](https://www.baeldung.com/jax-ws)

jee-kotlin/README.md

@@ -3,4 +3,4 @@
 This module contains articles about Java EE with Kotlin. 
 
 ### Relevant Articles:
-- [Java EE Application with Kotlin](https://www.baeldung.com/java-ee-kotlin-app)
+- [Jakarta EE Application with Kotlin](https://www.baeldung.com/java-ee-kotlin-app)

jhipster/jhipster-uaa/quotes/pom.xml

@@ -232,7 +232,7 @@
         <dependency>
             <groupId>org.zalando</groupId>
             <artifactId>problem-spring-web</artifactId>
-            <version>0.24.0-RC.0</version>
+            <version>${zalando.version}</version>
         </dependency>
         <dependency>
             <groupId>org.springframework.security.oauth</groupId>
@@ -910,5 +910,6 @@
         <sonar.tests>${project.basedir}/src/test/</sonar.tests>
 
         <!-- jhipster-needle-maven-property -->
+        <zalando.version>0.24.0-RC.0</zalando.version>
     </properties>	
 </project>

jta/README.md

@@ -3,4 +3,4 @@
 This module contains articles about the Java Transaction API (JTA).
 
 ### Relevant Articles:
-- [Guide to Java EE JTA](https://www.baeldung.com/jee-jta)
+- [Guide to Jakarta EE JTA](https://www.baeldung.com/jee-jta)

kotlin-libraries-2/pom.xml

@@ -21,7 +21,7 @@
         <dependency>
             <groupId>io.reactivex.rxjava2</groupId>
             <artifactId>rxkotlin</artifactId>
-            <version>2.3.0</version>
+            <version>${rxkotlin.version}</version>
         </dependency>
         <dependency>
             <groupId>junit</groupId>
@@ -86,6 +86,7 @@
         <guava.version>27.1-jre</guava.version>
         <mockk.version>1.9.3</mockk.version>
         <kotlinx-collections-immutable.version>0.1</kotlinx-collections-immutable.version>
+        <rxkotlin.version>2.3.0</rxkotlin.version>
     </properties>
 
 </project>

kotlin-quasar/pom.xml

@@ -48,7 +48,7 @@
         <dependency>
             <groupId>junit</groupId>
             <artifactId>junit</artifactId>
-            <version>4.12</version>
+            <version>${junit.version}</version>
         </dependency>
         <!-- logging -->
         <dependency>
@@ -148,6 +148,7 @@
         <dependency.plugin.version>3.1.1</dependency.plugin.version> 
         <surefire.plugin.version>2.22.1</surefire.plugin.version>
         <exec.plugin.version>1.3.2</exec.plugin.version>
+        <junit.version>4.12</junit.version>
     </properties>
 
 </project>

libraries-http/README.md

@@ -12,3 +12,4 @@ This module contains articles about HTTP libraries.
 - [Introduction to Retrofit](https://www.baeldung.com/retrofit)
 - [A Guide to Unirest](https://www.baeldung.com/unirest)
 - [Creating REST Microservices with Javalin](https://www.baeldung.com/javalin-rest-microservices)
+- [A Quick Guide to Timeouts in OkHttp](https://www.baeldung.com/okhttp-timeouts)

libraries-security/README.md

@@ -9,4 +9,4 @@ This module contains articles about security libraries.
 - [Guide to Google Tink](https://www.baeldung.com/google-tink)
 - [Introduction to BouncyCastle with Java](https://www.baeldung.com/java-bouncy-castle)
 - [Intro to Jasypt](https://www.baeldung.com/jasypt)
-- [Digital Signature in Java](https://www.baeldung.com/java-digital-signature)
+- [Digital Signatures in Java](https://www.baeldung.com/java-digital-signature)

maven-all/maven-custom-plugin/README.md

@@ -0,0 +1,3 @@
+### Relevant Articles:
+
+- [How to Create a Maven Plugin](https://www.baeldung.com/maven-plugin)

maven-all/profiles/pom.xml

@@ -73,7 +73,7 @@
             <plugin>
                 <groupId>org.apache.maven.plugins</groupId>
                 <artifactId>maven-help-plugin</artifactId>
-                <version>3.2.0</version>
+                <version>${help.plugin.version}</version>
                 <executions>
                     <execution>
                         <id>show-profiles</id>
@@ -87,4 +87,8 @@
         </plugins>
     </build>
 
+    <properties>
+       <help.plugin.version>3.2.0</help.plugin.version>
+    </properties>
+
 </project>

maven-all/versions-maven-plugin/original/pom.xml

@@ -46,7 +46,7 @@
             <plugin>
                 <groupId>org.codehaus.mojo</groupId>
                 <artifactId>versions-maven-plugin</artifactId>
-                <version>2.7</version>
+                <version>${versions.plugin.version}</version>
                 <configuration>
                     <excludes>
                         <exclude>org.apache.commons:commons-collections4</exclude>
@@ -76,6 +76,7 @@
         <commons-collections4.version>4.0</commons-collections4.version>
         <commons-lang3.version>3.0</commons-lang3.version>
         <commons-beanutils.version>1.9.1</commons-beanutils.version>
+        <versions.plugin.version>2.7</versions.plugin.version>
     </properties>
     	
 </project>

ninja/pom.xml

@@ -16,6 +16,12 @@
         <bootstrap.version>3.3.4</bootstrap.version>
         <jquery.version>2.1.3</jquery.version>
         <h2.version>1.4.186</h2.version>
+        <compiler.plugin.version>3.2</compiler.plugin.version>
+        <source.version>1.8</source.version>
+        <target.version>1.8</target.version>
+        <enforcer.plugin.version>1.3.1</enforcer.plugin.version>
+        <deploy.plugin.version>2.8.2</deploy.plugin.version>
+        <shade.plugin.version>2.2</shade.plugin.version>
     </properties>
 
     <build>
@@ -23,16 +29,16 @@
             <plugin>
                 <groupId>org.apache.maven.plugins</groupId>
                 <artifactId>maven-compiler-plugin</artifactId>
-                <version>3.2</version>
+                <version>${compiler.plugin.version}</version>
                 <configuration>
-                    <source>1.8</source>
-                    <target>1.8</target>
+                    <source>${source.version}</source>
+                    <target>${target.version}</target>
                 </configuration>
             </plugin>
             <plugin>
                 <groupId>org.apache.maven.plugins</groupId>
                 <artifactId>maven-enforcer-plugin</artifactId>
-                <version>1.3.1</version>
+                <version>${enforcer.plugin.version}</version>
                 <executions>
                     <execution>
                         <id>enforce-banned-dependencies</id>
@@ -95,7 +101,7 @@
             <plugin>
                 <groupId>org.apache.maven.plugins</groupId>
                 <artifactId>maven-deploy-plugin</artifactId>
-                <version>2.8.2</version>
+                <version>${deploy.plugin.version}</version>
                 <configuration>
                     <skip>true</skip>
                 </configuration>
@@ -103,7 +109,7 @@
             <plugin>
                 <groupId>org.apache.maven.plugins</groupId>
                 <artifactId>maven-shade-plugin</artifactId>
-                <version>2.2</version>
+                <version>${shade.plugin.version}</version>
                 <configuration>
                     <createDependencyReducedPom>true</createDependencyReducedPom>
                     <filters>

oauth2-framework-impl/README.md

@@ -4,4 +4,4 @@ This module contains articles about the implementation of OAuth2 with Java EE.
 
 ### Relevant Articles
 
-- [Implementing The OAuth 2.0 Authorization Framework Using Java EE](https://www.baeldung.com/java-ee-oauth2-implementation)
+- [Implementing The OAuth 2.0 Authorization Framework Using Jakarta EE](https://www.baeldung.com/java-ee-oauth2-implementation)

parent-kotlin/pom.xml

@@ -45,7 +45,7 @@
             <dependency>
                 <groupId>org.springframework.boot</groupId>
                 <artifactId>spring-boot-dependencies</artifactId>
-                <version>2.2.0.M4</version>
+                <version>${boot.dependencies.version}</version>
                 <type>pom</type>
                 <scope>import</scope>
             </dependency>
@@ -215,6 +215,7 @@
         <ktor.io.version>0.9.5</ktor.io.version>
         <assertj.version>3.12.0</assertj.version>
         <junit.platform.version>1.3.2</junit.platform.version>
+        <boot.dependencies.version>2.2.0.M4</boot.dependencies.version>
     </properties>
 
 </project>

performance-tests/pom.xml

@@ -38,7 +38,7 @@
         <dependency>
             <groupId>org.mapstruct</groupId>
             <artifactId>mapstruct-processor</artifactId>
-            <version>1.2.0.Final</version>
+            <version>${mapstruct-jdk8.version}</version>
             <scope>provided</scope>
         </dependency>
 
@@ -93,6 +93,15 @@
             Name of the benchmark Uber-JAR to generate.
           -->
         <uberjar.name>benchmarks</uberjar.name>
+        <compiler.plugin.version>3.1</compiler.plugin.version>
+        <shade.plugin.version>2.2</shade.plugin.version>
+        <install.version>2.5.1</install.version>
+        <jar.plugin.version>2.4</jar.plugin.version>
+        <javadoc.plugin.version>2.9.1</javadoc.plugin.version>
+        <resources.plugin.version>2.6</resources.plugin.version>
+        <site.plugin.version>3.3</site.plugin.version>
+        <source.plugin.version>2.2.1</source.plugin.version>
+        <surefire.plugin.version>2.17</surefire.plugin.version>
     </properties>
 
     <build>
@@ -100,7 +109,7 @@
             <plugin>
                 <groupId>org.apache.maven.plugins</groupId>
                 <artifactId>maven-compiler-plugin</artifactId>
-                <version>3.1</version>
+                <version>${compiler.plugin.version}</version>
                 <configuration>
                     <compilerVersion>${javac.target}</compilerVersion>
                     <source>${javac.target}</source>
@@ -117,7 +126,7 @@
             <plugin>
                 <groupId>org.apache.maven.plugins</groupId>
                 <artifactId>maven-shade-plugin</artifactId>
-                <version>2.2</version>
+                <version>${shade.plugin.version}</version>
                 <executions>
                     <execution>
                         <phase>package</phase>
@@ -162,31 +171,31 @@
                 </plugin>
                 <plugin>
                     <artifactId>maven-install-plugin</artifactId>
-                    <version>2.5.1</version>
+                    <version>${install.version}</version>
                 </plugin>
                 <plugin>
                     <artifactId>maven-jar-plugin</artifactId>
-                    <version>2.4</version>
+                    <version>${jar.plugin.version}</version>
                 </plugin>
                 <plugin>
                     <artifactId>maven-javadoc-plugin</artifactId>
-                    <version>2.9.1</version>
+                    <version>${javadoc.plugin.version}</version>
                 </plugin>
                 <plugin>
                     <artifactId>maven-resources-plugin</artifactId>
-                    <version>2.6</version>
+                    <version>${resources.plugin.version}</version>
                 </plugin>
                 <plugin>
                     <artifactId>maven-site-plugin</artifactId>
-                    <version>3.3</version>
+                    <version>${site.plugin.version}</version>
                 </plugin>
                 <plugin>
                     <artifactId>maven-source-plugin</artifactId>
-                    <version>2.2.1</version>
+                    <version>${source.plugin.version}</version>
                 </plugin>
                 <plugin>
                     <artifactId>maven-surefire-plugin</artifactId>
-                    <version>2.17</version>
+                    <version>${surefire.plugin.version}</version>
                 </plugin>
             </plugins>
         </pluginManagement>

persistence-modules/hibernate5-2/README.md

@@ -6,4 +6,5 @@ This module contains articles about Hibernate 5.
 - [Hibernate Error “Not all named parameters have been set”](https://www.baeldung.com/hibernate-error-named-parameters-not-set)
 - [FetchMode in Spring Data JPA](https://www.baeldung.com/spring-data-jpa-fetchmode)
 - [JPA/Hibernate Persistence Context](https://www.baeldung.com/jpa-hibernate-persistence-context)
+- [FetchMode in Hibernate](https://www.baeldung.com/hibernate-fetchmode)
 - [[<-- Prev]](/hibernate5)

persistence-modules/hibernate5-2/pom.xml

@@ -56,7 +56,7 @@
         <dependency>
         	<groupId>org.apache.commons</groupId>
         	<artifactId>commons-lang3</artifactId>
-            <version>${commons-lang3.version}</version>
+        	<version>${commons.lang3.version}</version>
         </dependency>
     </dependencies>
 
@@ -66,6 +66,9 @@
         <commons-lang3.version>3.8.1</commons-lang3.version>
         <maven.deploy.skip>true</maven.deploy.skip>
         <spring-boot.version>2.1.7.RELEASE</spring-boot.version>
+        <hibernate.core.version>5.4.7.Final</hibernate.core.version>
+        <h2.version>1.4.200</h2.version>
+        <commons.lang3.version>3.8.1</commons.lang3.version>
     </properties>
 
 </project>

persistence-modules/jnosql/jnosql-diana/pom.xml

@@ -55,7 +55,7 @@
             <plugin>
                 <groupId>org.codehaus.mojo</groupId>
                 <artifactId>exec-maven-plugin</artifactId>
-                <version>1.6.0</version>
+                <version>${exec-maven-plugin.version}</version>
                 <executions>
                     <execution>
                         <id>document</id>

persistence-modules/sirix/README.md

@@ -1,4 +1,3 @@
 ## Relevant articles:
 
-- [Introduction to Sirix](https://www.baeldung.com/introduction-to-sirix)
 - [A Guide to SirixDB](https://www.baeldung.com/sirix)

persistence-modules/sirix/pom.xml

@@ -30,7 +30,7 @@
             <plugin>
                 <groupId>org.apache.maven.plugins</groupId>
                 <artifactId>maven-compiler-plugin</artifactId>
-                <version>3.8.0</version>
+                <version>${compiler.plugin.version}</version>
                 <configuration>
                     <release>${maven.release.version}</release>
                     <encoding>${project.build.sourceEncoding}</encoding>
@@ -39,7 +39,7 @@
                     <dependency>
                         <groupId>org.ow2.asm</groupId>
                         <artifactId>asm</artifactId>
-                        <version>6.1</version> <!-- Use newer version of ASM -->
+                        <version>${asm.version}</version> <!-- Use newer version of ASM -->
                     </dependency>
                 </dependencies>
             </plugin>
@@ -50,6 +50,8 @@
         <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
         <maven.release.version>11</maven.release.version>
         <sirix-core.version>0.9.3</sirix-core.version>
+        <compiler.plugin.version>3.8.0</compiler.plugin.version>
+        <asm.version>6.1</asm.version>
     </properties>
 
 </project>

persistence-modules/spring-boot-persistence-2/pom.xml

@@ -20,7 +20,7 @@
             <dependency>
                 <groupId>org.springframework.boot</groupId>
                 <artifactId>spring-boot-dependencies</artifactId>
-                <version>2.1.8.RELEASE</version>
+                <version>${spring.boot.dependencies}</version>
                 <type>pom</type>
                 <scope>import</scope>
             </dependency>
@@ -95,6 +95,7 @@
 
     <properties>
         <jdbi.version>3.9.1</jdbi.version>
+        <spring.boot.dependencies>2.1.8.RELEASE</spring.boot.dependencies>
     </properties>
 
 </project>

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

@@ -17,7 +17,7 @@
         <dependency>
             <groupId>org.springframework.boot</groupId>
             <artifactId>spring-boot-starter</artifactId>
-            <version>${spring-boot-version}</version>
+            <version>${spring.boot.starter.version}</version>
             <exclusions>
                 <exclusion>
                     <groupId>org.springframework.boot</groupId>
@@ -88,6 +88,7 @@
         <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
         <start-class>com.baeldung.springdatageode.app.ClientCacheApp</start-class>
         <spring-geode-starter-version>1.1.1.RELEASE</spring-geode-starter-version>
+        <spring.boot.starter.version>2.1.9.RELEASE</spring.boot.starter.version>
     </properties>
 
 </project>

pom.xml

@@ -641,27 +641,21 @@
                 <module>spring-boot</module>
                 <module>spring-boot-modules</module>
                 <module>spring-boot-angular</module>
-                <module>spring-boot-autoconfiguration</module>
                 <module>spring-boot-bootstrap</module>
-                <module>spring-boot-camel</module>
                 <!-- <module>spring-boot-cli</module> --> <!-- Not a maven project -->
                 <module>spring-boot-client</module>
                 <module>spring-boot-config-jpa-error</module>
-                <module>spring-boot-crud</module>
                 <module>spring-boot-ctx-fluent</module>
-                <module>spring-boot-custom-starter</module>
                 <module>spring-boot-deployment</module>
                 <module>spring-boot-di</module>
                 <module>spring-boot-environment</module>
                 <module>spring-boot-flowable</module>
-                <!-- <module>spring-boot-gradle</module> --> <!-- Not a maven project -->
                 <module>spring-boot-jasypt</module>
                 <module>spring-boot-kotlin</module>
                 <module>spring-boot-libraries</module>
-                <module>spring-boot-logging-log4j2</module>
                 <module>spring-boot-mvc-2</module>
-                <module>spring-boot-nashorn</module>
                 <module>spring-boot-parent</module>
+                <module>spring-boot-performance</module>
                 <module>spring-boot-property-exp</module>
 
                 <module>spring-boot-rest</module>
@@ -1171,28 +1165,22 @@
                 <module>spring-boot</module>
                 <module>spring-boot-modules</module>
                 <module>spring-boot-angular</module>
-                <module>spring-boot-autoconfiguration</module>
                 <module>spring-boot-bootstrap</module>
-                <module>spring-boot-camel</module>
                 <!-- <module>spring-boot-cli</module> --> <!-- Not a maven project -->
                 <module>spring-boot-client</module>
                 <module>spring-boot-config-jpa-error</module>
-                <module>spring-boot-crud</module>
                 <module>spring-boot-ctx-fluent</module>
-                <module>spring-boot-custom-starter</module>
                 <module>spring-boot-deployment</module>
                 <module>spring-boot-di</module>
                 <module>spring-boot-environment</module>
                 <module>spring-boot-flowable</module>
-                <!-- <module>spring-boot-gradle</module> --> <!-- Not a maven project -->
                 <module>spring-boot-jasypt</module>
                 <module>spring-boot-kotlin</module>
                 <module>spring-boot-libraries</module>
-                <module>spring-boot-logging-log4j2</module>
                 <module>spring-boot-mvc</module>
                 <module>spring-boot-mvc-2</module>
-                <module>spring-boot-nashorn</module>
                 <module>spring-boot-parent</module>
+                <module>spring-boot-performance</module>
                 <module>spring-boot-property-exp</module>
 
                 <module>spring-boot-rest</module>

quarkus-extension/README.md

@@ -0,0 +1,3 @@
+### Relevant Articles:
+
+- [How to Implement a Quarkus Extension](https://www.baeldung.com/quarkus-extension-java)

quarkus-extension/quarkus-liquibase/deployment/pom.xml

@@ -40,7 +40,7 @@
             <plugin>
                 <groupId>org.apache.maven.plugins</groupId>
                 <artifactId>maven-compiler-plugin</artifactId>
-                <version>3.8.1</version>
+                <version>${compiler.plugin.version}</version>
                 <configuration>
                     <annotationProcessorPaths>
                         <path>
@@ -54,4 +54,8 @@
         </plugins>
     </build>
 
+    <properties>
+        <compiler.plugin.version>3.8.1</compiler.plugin.version>
+    </properties>
+
 </project>

quarkus-extension/quarkus-liquibase/runtime/pom.xml

@@ -50,7 +50,7 @@
             <plugin>
                 <groupId>org.apache.maven.plugins</groupId>
                 <artifactId>maven-compiler-plugin</artifactId>
-                <version>3.8.1</version>
+                <version>${compiler.plugin.version}</version>
                 <configuration>
                     <annotationProcessorPaths>
                         <path>
@@ -66,6 +66,8 @@
 
     <properties>
         <liquibase-core.version>3.8.1</liquibase-core.version>
+        <compiler.plugin.version>3.8.1</compiler.plugin.version>
+        <liquibase.version>3.8.1</liquibase.version>
     </properties>
 
 </project>

rxjava-core/README.md

@@ -13,4 +13,5 @@ This module contains articles about RxJava.
 - [RxJava Maybe](https://www.baeldung.com/rxjava-maybe)
 - [Combining RxJava Completables](https://www.baeldung.com/rxjava-completable)
 - [RxJava Hooks](https://www.baeldung.com/rxjava-hooks)
+- [Introduction to rxjava-jdbc](https://www.baeldung.com/rxjava-jdbc)
 - More articles: [[next -->]](/rxjava-2)

spf4j/spf4j-aspects-app/pom.xml

@@ -39,16 +39,16 @@
             <plugin>
                 <groupId>org.apache.maven.plugins</groupId>
                 <artifactId>maven-compiler-plugin</artifactId>
-                <version>3.8.0</version>
+                <version>${compiler.plugin.version}</version>
                 <configuration>
-                    <source>1.8</source>
-                    <target>1.8</target>
+                    <source>${java.version}</source>
+                    <target>${java.version}</target>
                 </configuration>
             </plugin>
             <plugin>
                 <groupId>org.apache.maven.plugins</groupId>
                 <artifactId>maven-dependency-plugin</artifactId>
-                <version>3.1.1</version>
+                <version>${dependency.plugin.version}</version>
                 <executions>
                     <execution>
                         <id>copy-dependencies</id>
@@ -84,6 +84,8 @@
         <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
         <spf4j.version>8.6.10</spf4j.version>
         <org.slf4j.version>1.7.21</org.slf4j.version>
+        <compiler.plugin.version>3.8.0</compiler.plugin.version>
+        <dependency.plugin.version>3.1.1</dependency.plugin.version>
     </properties>
 
 </project>

spf4j/spf4j-core-app/pom.xml

@@ -39,16 +39,16 @@
             <plugin>
                 <groupId>org.apache.maven.plugins</groupId>
                 <artifactId>maven-compiler-plugin</artifactId>
-                <version>3.8.0</version>
+                <version>${compiler.plugin.version}</version>
                 <configuration>
-                    <source>1.8</source>
-                    <target>1.8</target>
+                    <source>${java.version}</source>
+                    <target>${java.version}</target>
                 </configuration>
             </plugin>
             <plugin>
                 <groupId>org.apache.maven.plugins</groupId>
                 <artifactId>maven-dependency-plugin</artifactId>
-                <version>3.1.1</version>
+                <version>${dependency.plugin.version}</version>
                 <executions>
                     <execution>
                         <id>copy-dependencies</id>
@@ -84,6 +84,8 @@
         <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
         <spf4j.version>8.6.10</spf4j.version>
         <org.slf4j.version>1.7.21</org.slf4j.version>
+        <compiler.plugin.version>3.8.0</compiler.plugin.version>
+        <dependency.plugin.version>3.1.1</dependency.plugin.version>
     </properties>
 
 </project>

spring-amqp/README.md

@@ -6,3 +6,4 @@ This module contains articles about Spring with the AMQP messaging system
 
 - [Messaging With Spring AMQP](https://www.baeldung.com/spring-amqp)
 - [RabbitMQ Message Dispatching with Spring AMQP](https://www.baeldung.com/rabbitmq-spring-amqp)
+- [Error Handling with Spring AMQP](https://www.baeldung.com/spring-amqp-error-handling)

spring-boot-kotlin/README.md

@@ -3,4 +3,4 @@
 This module contains articles about Kotlin in Spring Boot projects.
 
 ### Relevant Articles:
-- [Non-blocking Spring Boot with Kotlin Coroutines](https://www.baeldung.com/non-blocking-spring-boot-with-kotlin-coroutines)
+- [Non-blocking Spring Boot with Kotlin Coroutines](https://www.baeldung.com/spring-boot-kotlin-coroutines)

spring-boot-modules/pom.xml

@@ -16,10 +16,16 @@
     <modules>
         <module>spring-boot-admin</module>
         <module>spring-boot-artifacts</module>
+        <module>spring-boot-autoconfiguration</module>
+        <module>spring-boot-camel</module>
+        <module>spring-boot-custom-starter</module>
+        <module>spring-boot-crud</module>
         <module>spring-boot-data</module>
+        <!-- <module>spring-boot-gradle</module> --> <!-- Not a maven project -->
         <module>spring-boot-keycloak</module>
+        <module>spring-boot-logging-log4j2</module>
         <module>spring-boot-mvc-birt</module>
-        <module>spring-boot-performance</module>
+        <module>spring-boot-nashorn</module>
         <module>spring-boot-properties</module>
         <module>spring-boot-springdoc</module>
         <module>spring-boot-testing</module>

spring-boot-modules/spring-boot-autoconfiguration/pom.xml

@@ -12,7 +12,7 @@
         <groupId>com.baeldung</groupId>
         <artifactId>parent-boot-2</artifactId>
         <version>0.0.1-SNAPSHOT</version>
-        <relativePath>../parent-boot-2</relativePath>
+        <relativePath>../../parent-boot-2</relativePath>
     </parent>
 
     <dependencies>

spring-boot-modules/spring-boot-camel/pom.xml

@@ -8,8 +8,8 @@
 	<name>spring-boot-camel</name>
 	
     <parent>
-        <groupId>com.baeldung</groupId>
-        <artifactId>parent-modules</artifactId>
+        <groupId>com.baeldung.spring-boot-modules</groupId>
+        <artifactId>spring-boot-modules</artifactId>
         <version>1.0.0-SNAPSHOT</version>
     </parent>