Merge pull request #92 from eugenp/master

update

akka-http/pom.xml

@@ -1,8 +1,7 @@
 <?xml version="1.0" encoding="UTF-8"?>
-<project
+<project xmlns="http://maven.apache.org/POM/4.0.0"
-    xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd"
+    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
-    xmlns="http://maven.apache.org/POM/4.0.0"
+    xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
-    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
     <modelVersion>4.0.0</modelVersion>
     <artifactId>akka-http</artifactId>
     <name>akka-http</name>

akka-streams/pom.xml

@@ -1,6 +1,5 @@
 <?xml version="1.0" encoding="UTF-8"?>
-<project
+<project xmlns="http://maven.apache.org/POM/4.0.0"
-    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>

algorithms-genetic/pom.xml

@@ -1,6 +1,5 @@
 <?xml version="1.0" encoding="UTF-8"?>
-<project
+<project xmlns="http://maven.apache.org/POM/4.0.0"
-    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>

algorithms-miscellaneous-1/pom.xml

@@ -1,6 +1,5 @@
 <?xml version="1.0" encoding="UTF-8"?>
-<project
+<project xmlns="http://maven.apache.org/POM/4.0.0"
-    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>

algorithms-miscellaneous-2/pom.xml

@@ -1,6 +1,5 @@
 <?xml version="1.0" encoding="UTF-8"?>
-<project
+<project xmlns="http://maven.apache.org/POM/4.0.0"
-    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>

algorithms-miscellaneous-3/pom.xml

@@ -1,6 +1,5 @@
 <?xml version="1.0" encoding="UTF-8"?>
-<project
+<project xmlns="http://maven.apache.org/POM/4.0.0"
-    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>

algorithms-miscellaneous-4/pom.xml

@@ -1,6 +1,5 @@
 <?xml version="1.0" encoding="UTF-8"?>
-<project
+<project xmlns="http://maven.apache.org/POM/4.0.0"
-    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>

algorithms-miscellaneous-5/pom.xml

@@ -1,6 +1,5 @@
 <?xml version="1.0" encoding="UTF-8"?>
-<project
+<project xmlns="http://maven.apache.org/POM/4.0.0"
-    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>

algorithms-miscellaneous-6/pom.xml

@@ -1,5 +1,6 @@
 <?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"
+<project xmlns="http://maven.apache.org/POM/4.0.0"
+    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
     xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
     <modelVersion>4.0.0</modelVersion>
     <artifactId>algorithms-miscellaneous-6</artifactId>

algorithms-searching/pom.xml

@@ -1,6 +1,5 @@
 <?xml version="1.0" encoding="UTF-8"?>
-<project
+<project xmlns="http://maven.apache.org/POM/4.0.0"
-    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>

algorithms-sorting-2/pom.xml

@@ -1,5 +1,4 @@
-<project
+<project xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
-    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
     xmlns="http://maven.apache.org/POM/4.0.0"
     xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
     <modelVersion>4.0.0</modelVersion>

algorithms-sorting/pom.xml

@@ -1,6 +1,5 @@
 <?xml version="1.0" encoding="UTF-8"?>
-<project
+<project xmlns="http://maven.apache.org/POM/4.0.0"
-    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>

animal-sniffer-mvn-plugin/pom.xml

@@ -1,6 +1,5 @@
 <?xml version="1.0" encoding="UTF-8"?>
-<project
+<project xmlns="http://maven.apache.org/POM/4.0.0"
-    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>

annotations/annotation-processing/pom.xml

@@ -1,6 +1,5 @@
 <?xml version="1.0" encoding="UTF-8"?>
-<project
+<project xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
-    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
     xmlns="http://maven.apache.org/POM/4.0.0"
     xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
     <modelVersion>4.0.0</modelVersion>

annotations/annotation-user/pom.xml

@@ -1,6 +1,5 @@
 <?xml version="1.0" encoding="UTF-8"?>
-<project
+<project xmlns="http://maven.apache.org/POM/4.0.0"
-    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>

annotations/pom.xml

@@ -1,6 +1,5 @@
 <?xml version="1.0" encoding="UTF-8"?>
-<project
+<project xmlns="http://maven.apache.org/POM/4.0.0"
-    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>

antlr/pom.xml

@@ -1,6 +1,5 @@
 <?xml version="1.0" encoding="UTF-8"?>
-<project
+<project xmlns="http://maven.apache.org/POM/4.0.0"
-    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>

apache-cxf/cxf-aegis/pom.xml

@@ -1,6 +1,5 @@
 <?xml version="1.0" encoding="UTF-8"?>
-<project
+<project xmlns="http://maven.apache.org/POM/4.0.0"
-    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>

apache-cxf/cxf-introduction/pom.xml

@@ -1,6 +1,5 @@
 <?xml version="1.0" encoding="UTF-8"?>
-<project
+<project xmlns="http://maven.apache.org/POM/4.0.0"
-    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>

apache-cxf/cxf-jaxrs-implementation/pom.xml

@@ -1,6 +1,5 @@
 <?xml version="1.0" encoding="UTF-8"?>
-<project
+<project xmlns="http://maven.apache.org/POM/4.0.0"
-    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>

apache-cxf/cxf-spring/pom.xml

@@ -1,6 +1,5 @@
 <?xml version="1.0" encoding="UTF-8"?>
-<project
+<project xmlns="http://maven.apache.org/POM/4.0.0"
-    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>

apache-cxf/pom.xml

@@ -1,6 +1,5 @@
 <?xml version="1.0" encoding="UTF-8"?>
-<project
+<project xmlns="http://maven.apache.org/POM/4.0.0"
-    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>

apache-cxf/sse-jaxrs/pom.xml

@@ -1,6 +1,5 @@
 <?xml version="1.0" encoding="UTF-8"?>
-<project
+<project xmlns="http://maven.apache.org/POM/4.0.0"
-    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>

apache-cxf/sse-jaxrs/sse-jaxrs-client/pom.xml

@@ -1,6 +1,5 @@
 <?xml version="1.0" encoding="UTF-8"?>
-<project
+<project xmlns="http://maven.apache.org/POM/4.0.0"
-    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>

apache-cxf/sse-jaxrs/sse-jaxrs-server/pom.xml

@@ -1,6 +1,5 @@
 <?xml version="1.0" encoding="UTF-8"?>
-<project
+<project xmlns="http://maven.apache.org/POM/4.0.0"
-    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>

apache-libraries/pom.xml

@@ -1,5 +1,6 @@
 <?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"
+<project xmlns="http://maven.apache.org/POM/4.0.0"
+    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
     xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
     <modelVersion>4.0.0</modelVersion>
     <artifactId>apache-libraries</artifactId>
@@ -29,7 +30,6 @@
             <artifactId>avro-maven-plugin</artifactId>
             <version>${avro.version}</version>
         </dependency>
-
         <!-- beam -->
         <dependency>
             <groupId>org.apache.beam</groupId>
@@ -43,7 +43,6 @@
             <version>${beam.version}</version>
             <scope>runtime</scope>
         </dependency>
-
         <!-- bval -->
         <dependency>
             <groupId>org.apache.bval</groupId>
@@ -60,7 +59,6 @@
             <artifactId>bval-extras</artifactId>
             <version>${bval.version}</version>
         </dependency>
-
         <!-- meecrowave -->
         <dependency>
             <groupId>org.apache.meecrowave</groupId>
@@ -84,14 +82,12 @@
             <version>${meecrowave-junit.version}</version>
             <scope>test</scope>
         </dependency>
-        
         <!-- opennlp -->
         <dependency>
             <groupId>org.apache.opennlp</groupId>
             <artifactId>opennlp-tools</artifactId>
             <version>${opennlp.opennlp-tools.version}</version>
         </dependency>
-        
         <!-- pulsar -->
         <dependency>
             <groupId>org.apache.pulsar</groupId>
@@ -99,14 +95,12 @@
             <version>${pulsar-client.version}</version>
             <scope>compile</scope>
         </dependency>
-        
         <!-- zookeeper -->
         <dependency>
             <groupId>org.apache.zookeeper</groupId>
             <artifactId>zookeeper</artifactId>
             <version>${zookeeper.version}</version>
         </dependency>
-        
         <!-- curator -->
         <dependency>
             <groupId>org.apache.curator</groupId>
@@ -145,21 +139,18 @@
             <version>${avaitility.version}</version>
             <scope>test</scope>
         </dependency>
-        
         <!-- geode -->
         <dependency>
             <groupId>org.apache.geode</groupId>
             <artifactId>geode-core</artifactId>
             <version>${geode.core}</version>
         </dependency>
-        
         <!-- solr -->
         <dependency>
             <groupId>org.apache.solr</groupId>
             <artifactId>solr-solrj</artifactId>
             <version>${solr.solr-solrj.version}</version>
         </dependency>
-        
         <!-- common -->
         <dependency>
             <groupId>org.assertj</groupId>

apache-olingo/olingo2/pom.xml

@@ -1,6 +1,5 @@
 <?xml version="1.0" encoding="UTF-8"?>
-<project
+<project xmlns="http://maven.apache.org/POM/4.0.0"
-    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>
@@ -40,7 +39,6 @@
             <artifactId>spring-boot-starter-test</artifactId>
             <scope>test</scope>
         </dependency>
-
         <!-- Olingo 2 Dependencies -->
         <dependency>
             <groupId>org.apache.olingo</groupId>

apache-poi/pom.xml

@@ -1,6 +1,5 @@
 <?xml version="1.0" encoding="UTF-8"?>
-<project
+<project xmlns="http://maven.apache.org/POM/4.0.0"
-    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>

apache-rocketmq/pom.xml

@@ -1,6 +1,5 @@
 <?xml version="1.0" encoding="UTF-8"?>
-<project
+<project xmlns="http://maven.apache.org/POM/4.0.0"
-    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>

apache-shiro/pom.xml

@@ -1,6 +1,5 @@
 <?xml version="1.0" encoding="UTF-8"?>
-<project
+<project xmlns="http://maven.apache.org/POM/4.0.0"
-    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>

apache-spark/pom.xml

@@ -1,6 +1,5 @@
 <?xml version="1.0" encoding="UTF-8"?>
-<project
+<project xmlns="http://maven.apache.org/POM/4.0.0"
-    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>

apache-tapestry/pom.xml

@@ -1,8 +1,7 @@
 <?xml version="1.0" encoding="UTF-8"?>
-<project
+<project 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"
+    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">
-    xmlns="http://maven.apache.org/POM/4.0.0">
     <modelVersion>4.0.0</modelVersion>
     <groupId>com.baeldung</groupId>
     <artifactId>apache-tapestry</artifactId>
@@ -12,45 +11,43 @@
 
     <dependencies>
         <!-- To set up an application with a database, change the artifactId below to tapestry-hibernate, 
-        and add a dependency on your JDBC driver. You'll also need to add Hibernate configuration files, such as hibernate.cfg.xml. -->
+            and add a dependency on your JDBC driver. You'll also need to add Hibernate configuration files, such 
+            as hibernate.cfg.xml. -->
         <dependency>
             <groupId>org.apache.tapestry</groupId>
             <artifactId>tapestry-core</artifactId>
             <version>${tapestry-release-version}</version>
         </dependency>
-
         <!-- Include the Log4j implementation for the SLF4J logging framework -->
         <dependency>
             <groupId>org.slf4j</groupId>
             <artifactId>slf4j-log4j12</artifactId>
             <version>${slf4j-release-version}</version>
         </dependency>
-
         <dependency>
             <groupId>org.apache.tapestry</groupId>
             <artifactId>tapestry-webresources</artifactId>
             <version>${tapestry-release-version}</version>
         </dependency>
-
         <!-- Uncomment this to add support for file uploads: -->
-        <!-- <dependency> <groupId>org.apache.tapestry</groupId> <artifactId>tapestry-upload</artifactId> <version>${tapestry-release-version}</version> </dependency> -->
+        <!-- <dependency> <groupId>org.apache.tapestry</groupId> <artifactId>tapestry-upload</artifactId> 
+            <version>${tapestry-release-version}</version> </dependency> -->
 
-        <!-- A dependency on either JUnit or TestNG is required, or the surefire plugin (which runs the tests) will fail, preventing Maven from packaging the WAR. Tapestry includes 
+        <!-- A dependency on either JUnit or TestNG is required, or the surefire plugin (which runs the 
-            a large number of testing facilities designed for use with TestNG (http://testng.org/), so it's recommended. -->
+            tests) will fail, preventing Maven from packaging the WAR. Tapestry includes a large number of testing 
+            facilities designed for use with TestNG (http://testng.org/), so it's recommended. -->
         <dependency>
             <groupId>org.testng</groupId>
             <artifactId>testng</artifactId>
             <version>${testng-release-version}</version>
             <scope>test</scope>
         </dependency>
-
         <dependency>
             <groupId>org.apache.tapestry</groupId>
             <artifactId>tapestry-test</artifactId>
             <version>${tapestry-release-version}</version>
             <scope>test</scope>
         </dependency>
-
         <!-- Provided by the servlet container, but sometimes referenced in the application code. -->
         <dependency>
             <groupId>javax.servlet</groupId>
@@ -58,7 +55,6 @@
             <version>${servlet-api-release-version}</version>
             <scope>provided</scope>
         </dependency>
-
         <!-- Provide dependency to the Tapestry javadoc taglet which replaces the Maven component report -->
         <dependency>
             <groupId>org.apache.tapestry</groupId>
@@ -101,7 +97,8 @@
                 <configuration>
                     <!-- Log to the console. -->
                     <requestLog implementation="org.mortbay.jetty.NCSARequestLog">
-                        <!-- This doesn't do anything for Jetty, but is a workaround for a Maven bug that prevents the requestLog from being set. -->
+                        <!-- This doesn't do anything for Jetty, but is a workaround for a Maven bug 
+                            that prevents the requestLog from being set. -->
                         <append>true</append>
                     </requestLog>
                     <systemProperties>
@@ -123,7 +120,8 @@
             <url>http://repository.jboss.org/nexus/content/groups/public/</url>
         </repository>
 
-        <!-- This repository is only needed when the Tapestry version is a preview release, rather than a final release. -->
+        <!-- This repository is only needed when the Tapestry version is a preview release, rather than 
+            a final release. -->
         <repository>
             <id>apache-staging</id>
             <url>https://repository.apache.org/content/groups/staging/</url>

apache-thrift/pom.xml

@@ -1,6 +1,5 @@
 <?xml version="1.0" encoding="UTF-8"?>
-<project
+<project xmlns="http://maven.apache.org/POM/4.0.0"
-    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>
@@ -27,7 +26,6 @@
                 </exclusion>
             </exclusions>
         </dependency>
-
         <dependency>
             <groupId>org.slf4j</groupId>
             <artifactId>slf4j-simple</artifactId>

apache-tika/pom.xml

@@ -1,6 +1,5 @@
 <?xml version="1.0" encoding="UTF-8"?>
-<project
+<project xmlns="http://maven.apache.org/POM/4.0.0"
-    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>

apache-velocity/pom.xml

@@ -1,6 +1,5 @@
 <?xml version="1.0" encoding="UTF-8"?>
-<project
+<project xmlns="http://maven.apache.org/POM/4.0.0"
-    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>

asciidoctor/pom.xml

@@ -1,6 +1,5 @@
 <?xml version="1.0" encoding="UTF-8"?>
-<project
+<project xmlns="http://maven.apache.org/POM/4.0.0"
-    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>

asm/pom.xml

@@ -1,6 +1,5 @@
 <?xml version="1.0" encoding="UTF-8"?>
-<project
+<project xmlns="http://maven.apache.org/POM/4.0.0"
-    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>

atomix/pom.xml

@@ -1,6 +1,5 @@
 <?xml version="1.0" encoding="UTF-8"?>
-<project
+<project xmlns="http://maven.apache.org/POM/4.0.0"
-    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>

aws-app-sync/pom.xml

@@ -1,5 +1,6 @@
 <?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"
+<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 https://maven.apache.org/xsd/maven-4.0.0.xsd">
     <modelVersion>4.0.0</modelVersion>
     <artifactId>aws-app-sync</artifactId>
@@ -14,12 +15,10 @@
     </parent>
 
     <dependencies>
-
         <dependency>
             <groupId>org.springframework.boot</groupId>
             <artifactId>spring-boot-starter-web</artifactId>
         </dependency>
-
         <dependency>
             <groupId>org.springframework.boot</groupId>
             <artifactId>spring-boot-starter-test</artifactId>

aws-lambda/lambda/pom.xml

@@ -1,6 +1,5 @@
 <?xml version="1.0" encoding="UTF-8"?>
-<project
+<project xmlns="http://maven.apache.org/POM/4.0.0"
-    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>

aws-lambda/pom.xml

@@ -1,6 +1,5 @@
 <?xml version="1.0" encoding="UTF-8"?>
-<project
+<project xmlns="http://maven.apache.org/POM/4.0.0"
-    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>

aws-lambda/shipping-tracker/ShippingFunction/pom.xml

@@ -1,4 +1,5 @@
-<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+<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>
     <groupId>com.baeldung</groupId>
@@ -6,11 +7,6 @@
     <version>1.0</version>
     <packaging>jar</packaging>
     <name>ShippingFunction</name>
-    <properties>
-        <maven.compiler.source>1.8</maven.compiler.source>
-        <maven.compiler.target>1.8</maven.compiler.target>
-        <hibernate.version>5.4.21.Final</hibernate.version>
-    </properties>
 
     <dependencies>
         <dependency>
@@ -70,4 +66,11 @@
             </plugin>
         </plugins>
     </build>
+
+    <properties>
+        <maven.compiler.source>1.8</maven.compiler.source>
+        <maven.compiler.target>1.8</maven.compiler.target>
+        <hibernate.version>5.4.21.Final</hibernate.version>
+    </properties>
+
 </project>

aws-reactive/pom.xml

@@ -1,9 +1,12 @@
 <?xml version="1.0" encoding="UTF-8"?>
-<project
+<project xmlns="http://maven.apache.org/POM/4.0.0"
-    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 https://maven.apache.org/xsd/maven-4.0.0.xsd">
     <modelVersion>4.0.0</modelVersion>
+    <artifactId>aws-reactive</artifactId>
+    <version>0.0.1-SNAPSHOT</version>
+    <name>aws-reactive</name>
+    <description>AWS Reactive Sample</description>
 
     <parent>
         <groupId>com.baeldung</groupId>
@@ -11,14 +14,8 @@
         <version>1.0.0-SNAPSHOT</version>
     </parent>
 
-    <artifactId>aws-reactive</artifactId>
-    <version>0.0.1-SNAPSHOT</version>
-    <name>aws-reactive</name>
-    <description>AWS Reactive Sample</description>
-
     <dependencyManagement>
         <dependencies>
-
             <dependency>
                 <!-- Import dependency management from Spring Boot -->
                 <groupId>org.springframework.boot</groupId>
@@ -27,7 +24,6 @@
                 <type>pom</type>
                 <scope>import</scope>
             </dependency>
-
             <dependency>
                 <groupId>software.amazon.awssdk</groupId>
                 <artifactId>bom</artifactId>
@@ -43,20 +39,16 @@
             <groupId>org.springframework.boot</groupId>
             <artifactId>spring-boot-starter-webflux</artifactId>
         </dependency>
-
         <dependency>
             <groupId>software.amazon.awssdk</groupId>
             <artifactId>s3</artifactId>
             <scope>compile</scope>
         </dependency>
-
         <dependency>
             <artifactId>netty-nio-client</artifactId>
             <groupId>software.amazon.awssdk</groupId>
             <scope>compile</scope>
         </dependency>
-
-
         <dependency>
             <groupId>org.springframework.boot</groupId>
             <artifactId>spring-boot-starter-test</artifactId>
@@ -68,8 +60,6 @@
                 </exclusion>
             </exclusions>
         </dependency>
-
-
         <dependency>
             <groupId>io.projectreactor</groupId>
             <artifactId>reactor-test</artifactId>

aws/pom.xml

@@ -1,6 +1,5 @@
 <?xml version="1.0" encoding="UTF-8"?>
-<project
+<project xmlns="http://maven.apache.org/POM/4.0.0"
-    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>

axon/README.md

@@ -5,3 +5,4 @@ This module contains articles about Axon
 ### Relevant articles
 
 - [A Guide to the Axon Framework](https://www.baeldung.com/axon-cqrs-event-sourcing)
+- [Multi-Entity Aggregates in Axon](https://www.baeldung.com/java-axon-multi-entity-aggregates)

axon/pom.xml

@@ -1,6 +1,5 @@
 <?xml version="1.0" encoding="UTF-8"?>
-<project
+<project xmlns="http://maven.apache.org/POM/4.0.0"
-    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>
@@ -15,36 +14,41 @@
         <relativePath>../parent-boot-2</relativePath>
     </parent>
 
+    <dependencyManagement>
+        <dependencies>
+            <dependency>
+                <groupId>org.axonframework</groupId>
+                <artifactId>axon-bom</artifactId>
+                <version>4.5.0</version>
+                <type>pom</type>
+                <scope>import</scope>
+            </dependency>
+        </dependencies>
+    </dependencyManagement>
+
     <dependencies>
         <dependency>
             <groupId>org.axonframework</groupId>
             <artifactId>axon-spring-boot-starter</artifactId>
-            <version>${axon.version}</version>
         </dependency>
-
         <dependency>
             <groupId>org.axonframework</groupId>
             <artifactId>axon-test</artifactId>
-            <version>${axon.version}</version>
             <scope>test</scope>
         </dependency>
-
         <dependency>
             <groupId>org.springframework.boot</groupId>
             <artifactId>spring-boot-autoconfigure</artifactId>
             <scope>compile</scope>
         </dependency>
-
         <dependency>
             <groupId>org.springframework.boot</groupId>
             <artifactId>spring-boot-starter-web</artifactId>
         </dependency>
-
         <dependency>
             <groupId>org.springframework.boot</groupId>
             <artifactId>spring-boot-starter-data-jpa</artifactId>
         </dependency>
-
         <dependency>
             <groupId>com.h2database</groupId>
             <artifactId>h2</artifactId>
@@ -52,8 +56,4 @@
         </dependency>
     </dependencies>
 
-    <properties>
-        <axon.version>4.4.7</axon.version>
-    </properties>
-
 </project>

azure/pom.xml

@@ -1,6 +1,5 @@
 <?xml version="1.0" encoding="UTF-8"?>
-<project
+<project xmlns="http://maven.apache.org/POM/4.0.0"
-    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>
@@ -22,24 +21,20 @@
             <groupId>org.springframework.boot</groupId>
             <artifactId>spring-boot-starter-web</artifactId>
         </dependency>
-
         <dependency>
             <groupId>org.springframework.boot</groupId>
             <artifactId>spring-boot-starter-tomcat</artifactId>
             <scope>provided</scope>
         </dependency>
-
         <dependency>
             <groupId>org.springframework.boot</groupId>
             <artifactId>spring-boot-starter-data-jpa</artifactId>
         </dependency>
-
         <dependency>
             <groupId>com.h2database</groupId>
             <artifactId>h2</artifactId>
             <scope>runtime</scope>
         </dependency>
-
         <dependency>
             <groupId>mysql</groupId>
             <artifactId>mysql-connector-java</artifactId>

bazel/bazelapp/pom.xml

@@ -1,6 +1,5 @@
 <?xml version="1.0" encoding="UTF-8"?>
-<project
+<project xmlns="http://maven.apache.org/POM/4.0.0"
-    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>

bazel/bazelgreeting/pom.xml

@@ -1,6 +1,5 @@
 <?xml version="1.0" encoding="UTF-8"?>
-<project
+<project xmlns="http://maven.apache.org/POM/4.0.0"
-    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>

bazel/pom.xml

@@ -1,6 +1,5 @@
 <?xml version="1.0" encoding="UTF-8"?>
-<project
+<project xmlns="http://maven.apache.org/POM/4.0.0"
-    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>

blade/pom.xml

@@ -1,6 +1,5 @@
 <?xml version="1.0" encoding="UTF-8"?>
-<project
+<project xmlns="http://maven.apache.org/POM/4.0.0"
-    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>
@@ -19,19 +18,16 @@
             <artifactId>blade-mvc</artifactId>
             <version>${blade-mvc.version}</version>
         </dependency>
-
         <dependency>
             <groupId>org.webjars</groupId>
             <artifactId>bootstrap</artifactId>
             <version>${bootstrap.version}</version>
         </dependency>
-
         <dependency>
             <groupId>org.apache.commons</groupId>
             <artifactId>commons-lang3</artifactId>
             <version>${commons-lang3.version}</version>
         </dependency>
-
         <!-- PROVIDED -->
         <dependency>
             <groupId>org.projectlombok</groupId>
@@ -39,7 +35,6 @@
             <version>${lombok.version}</version>
             <scope>provided</scope>
         </dependency>
-
         <!-- TEST -->
         <dependency>
             <groupId>org.assertj</groupId>
@@ -111,7 +106,6 @@
                             </arguments>
                         </configuration>
                     </execution>
-
                     <!--Stop all processes in reverse order -->
                     <execution>
                         <id>stop-all</id>
@@ -122,7 +116,6 @@
                     </execution>
                 </executions>
             </plugin>
-
             <plugin>
                 <artifactId>maven-assembly-plugin</artifactId>
                 <version>${assembly.plugin.version}</version>

bootique/pom.xml

@@ -1,6 +1,5 @@
 <?xml version="1.0" encoding="UTF-8"?>
-<project
+<project xmlns="http://maven.apache.org/POM/4.0.0"
-    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>

cdi/pom.xml

@@ -1,6 +1,5 @@
 <?xml version="1.0" encoding="UTF-8"?>
-<project
+<project xmlns="http://maven.apache.org/POM/4.0.0"
-        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>

checker-plugin/pom.xml

@@ -1,6 +1,5 @@
 <?xml version="1.0" encoding="UTF-8"?>
-<project
+<project xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
-    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
     xmlns="http://maven.apache.org/POM/4.0.0"
     xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/maven-v4_0_0.xsd">
     <modelVersion>4.0.0</modelVersion>
@@ -69,7 +68,6 @@
                         <!-- location of the annotated JDK, which comes from a Maven dependency -->
                         <arg>-Xbootclasspath/p:${annotatedJdk}</arg>
                         <!-- -->
-
                         <!-- Uncomment the following line to use the type annotations compiler. -->
                         <!-- <arg>-J-Xbootclasspath/p:${typeAnnotationsJavac}</arg> -->
                         <!-- Uncomment the following line to turn type-checking warnings into errors. -->

cloud-foundry-uaa/cf-uaa-oauth2-client/pom.xml

@@ -1,6 +1,5 @@
 <?xml version="1.0" encoding="UTF-8"?>
-<project
+<project xmlns="http://maven.apache.org/POM/4.0.0"
-    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>

cloud-foundry-uaa/cf-uaa-oauth2-resource-server/pom.xml

@@ -1,6 +1,5 @@
 <?xml version="1.0" encoding="UTF-8"?>
-<project
+<project xmlns="http://maven.apache.org/POM/4.0.0"
-    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>

code-generation/pom.xml

@@ -1,6 +1,5 @@
 <?xml version="1.0" encoding="UTF-8"?>
-<project
+<project xmlns="http://maven.apache.org/POM/4.0.0"
-    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>
@@ -43,7 +42,6 @@
             <version>${auto-service.version}</version>
             <optional>true</optional>
         </dependency>
-
         <dependency>
             <groupId>com.google.inject</groupId>
             <artifactId>guice</artifactId>

core-groovy-2/pom.xml

@@ -1,6 +1,5 @@
 <?xml version="1.0" encoding="UTF-8"?>
-<project
+<project xmlns="http://maven.apache.org/POM/4.0.0"
-    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>
@@ -190,4 +189,3 @@
     </properties>
 
 </project>
-

core-groovy-collections/pom.xml

@@ -1,6 +1,5 @@
 <?xml version="1.0" encoding="UTF-8"?>
-<project
+<project xmlns="http://maven.apache.org/POM/4.0.0"
-    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>
@@ -130,4 +129,3 @@
     </properties>
 
 </project>
-

core-groovy-strings/pom.xml

@@ -1,6 +1,5 @@
 <?xml version="1.0" encoding="UTF-8"?>
-<project
+<project xmlns="http://maven.apache.org/POM/4.0.0"
-    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>

core-groovy/pom.xml

@@ -1,6 +1,5 @@
 <?xml version="1.0" encoding="UTF-8"?>
-<project
+<project xmlns="http://maven.apache.org/POM/4.0.0"
-    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>
@@ -120,4 +119,3 @@
     </properties>
 
 </project>
-

core-java-modules/core-java-10/pom.xml

@@ -1,6 +1,5 @@
 <?xml version="1.0" encoding="UTF-8"?>
-<project
+<project xmlns="http://maven.apache.org/POM/4.0.0"
-        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>

core-java-modules/core-java-11-2/pom.xml

@@ -1,6 +1,5 @@
 <?xml version="1.0" encoding="UTF-8"?>
-<project
+<project xmlns="http://maven.apache.org/POM/4.0.0"
-        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>
@@ -51,6 +50,11 @@
             <version>${junit.jupiter.version}</version>
             <scope>test</scope>
         </dependency>
+        <dependency>
+            <groupId>org.apache.commons</groupId>
+            <artifactId>commons-lang3</artifactId>
+            <version>${commons-lang3.version}</version>
+        </dependency>
     </dependencies>
 
     <build>
@@ -74,6 +78,7 @@
         <junit.jupiter.version>5.7.0</junit.jupiter.version>
         <assertj.version>3.17.2</assertj.version>
         <mockserver.version>5.11.1</mockserver.version>
+        <commons-lang3.version>3.12.0</commons-lang3.version>
     </properties>
 
 </project>

core-java-modules/core-java-11-2/src/test/java/com/baeldung/version/VersionUnitTest.java

@@ -0,0 +1,48 @@
+package com.baeldung.version;
+
+import org.apache.commons.lang3.SystemUtils;
+import org.assertj.core.api.Assertions;
+import org.junit.jupiter.api.Disabled;
+import org.junit.jupiter.api.Test;
+
+public class VersionUnitTest {
+
+    @Test
+    public void givenJava_whenUsingRuntime_thenGetVersion() {
+        String expectedVersion = "11";
+        Runtime.Version runtimeVersion = Runtime.version();
+        String version = String.valueOf(runtimeVersion.version().get(0));
+        Assertions.assertThat(version).isEqualTo(expectedVersion);
+    }
+
+    @Test
+    @Disabled("Only valid for Java 8 and lower")
+    public void givenJava_whenUsingCommonsLang_thenGetVersion() {
+        int expectedVersion = 8;
+        String[] versionElements = SystemUtils.JAVA_SPECIFICATION_VERSION.split("\\.");
+        int discard = Integer.parseInt(versionElements[0]);
+        int version;
+        if (discard == 1) {
+            version = Integer.parseInt(versionElements[1]);
+        } else {
+            version = discard;
+        }
+        Assertions.assertThat(version).isEqualTo(expectedVersion);
+    }
+
+    @Test
+    @Disabled("Only valid for Java 8 and lower")
+    public void givenJava_whenUsingSystemProp_thenGetVersion() {
+        int expectedVersion = 8;
+        String[] versionElements = System.getProperty("java.version").split("\\.");
+        int discard = Integer.parseInt(versionElements[0]);
+        int version;
+        if (discard == 1) {
+            version = Integer.parseInt(versionElements[1]);
+        } else {
+            version = discard;
+        }
+        Assertions.assertThat(version).isEqualTo(expectedVersion);
+    }
+}
+

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

@@ -1,6 +1,5 @@
 <?xml version="1.0" encoding="UTF-8"?>
-<project
+<project xmlns="http://maven.apache.org/POM/4.0.0"
-    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>
@@ -76,10 +75,12 @@
                         <configuration>
                             <finalName>${uberjar.name}</finalName>
                             <transformers>
-                                <transformer implementation="org.apache.maven.plugins.shade.resource.ManifestResourceTransformer">
+                                <transformer
+                                    implementation="org.apache.maven.plugins.shade.resource.ManifestResourceTransformer">
                                     <mainClass>org.openjdk.jmh.Main</mainClass>
                                 </transformer>
-                                <transformer implementation="org.apache.maven.plugins.shade.resource.ServicesResourceTransformer" />
+                                <transformer
+                                    implementation="org.apache.maven.plugins.shade.resource.ServicesResourceTransformer" />
                             </transformers>
                             <filters>
                                 <filter>

core-java-modules/core-java-12/pom.xml

@@ -1,6 +1,5 @@
 <?xml version="1.0" encoding="UTF-8"?>
-<project
+<project xmlns="http://maven.apache.org/POM/4.0.0"
-    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>

core-java-modules/core-java-13/pom.xml

@@ -1,6 +1,5 @@
 <?xml version="1.0" encoding="UTF-8"?>
-<project
+<project xmlns="http://maven.apache.org/POM/4.0.0"
-    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>

core-java-modules/core-java-14/pom.xml

@@ -1,6 +1,5 @@
 <?xml version="1.0" encoding="UTF-8"?>
-<project
+<project xmlns="http://maven.apache.org/POM/4.0.0"
-    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>
@@ -15,6 +14,7 @@
         <version>1.0.0-SNAPSHOT</version>
         <relativePath>../../</relativePath>
     </parent>
+    
     <dependencies>
         <dependency>
             <groupId>org.assertj</groupId>
@@ -35,6 +35,7 @@
             <scope>test</scope>
         </dependency>
     </dependencies>
+    
     <build>
         <plugins>
             <plugin>

core-java-modules/core-java-15/pom.xml

@@ -1,6 +1,5 @@
 <?xml version="1.0" encoding="UTF-8"?>
-<project
+<project xmlns="http://maven.apache.org/POM/4.0.0"
-    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>

core-java-modules/core-java-8-2/pom.xml

@@ -1,6 +1,5 @@
 <?xml version="1.0" encoding="UTF-8"?>
-<project
+<project xmlns="http://maven.apache.org/POM/4.0.0"
-    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>
@@ -8,6 +7,7 @@
     <version>0.1.0-SNAPSHOT</version>
     <name>core-java-8-2</name>
     <packaging>jar</packaging>
+    
     <parent>
         <groupId>com.baeldung.core-java-modules</groupId>
         <artifactId>core-java-modules</artifactId>

core-java-modules/core-java-8-datetime-2/pom.xml

@@ -1,6 +1,5 @@
 <?xml version="1.0" encoding="UTF-8"?>
-<project
+<project xmlns="http://maven.apache.org/POM/4.0.0"
-    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>
@@ -8,6 +7,7 @@
     <version>${project.parent.version}</version>
     <name>core-java-8-datetime-2</name>
     <packaging>jar</packaging>
+    
     <parent>
         <groupId>com.baeldung.core-java-modules</groupId>
         <artifactId>core-java-modules</artifactId>
@@ -47,7 +47,6 @@
                 <filtering>true</filtering>
             </resource>
         </resources>
-
         <plugins>
             <plugin>
                 <groupId>org.apache.maven.plugins</groupId>

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

@@ -1,6 +1,5 @@
 <?xml version="1.0" encoding="UTF-8"?>
-<project
+<project xmlns="http://maven.apache.org/POM/4.0.0"
-    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>
@@ -8,6 +7,7 @@
     <version>${project.parent.version}</version>
     <name>core-java-8-datetime</name>
     <packaging>jar</packaging>
+    
     <parent>
         <groupId>com.baeldung.core-java-modules</groupId>
         <artifactId>core-java-modules</artifactId>
@@ -41,14 +41,13 @@
     </dependencies>
 
     <build>
-        <finalName>core-java-datetime-java8</finalName>
+        <finalName>core-java-8-datetime</finalName>
         <resources>
             <resource>
                 <directory>src/main/resources</directory>
                 <filtering>true</filtering>
             </resource>
         </resources>
-
         <plugins>
             <plugin>
                 <groupId>org.apache.maven.plugins</groupId>

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

@@ -1,6 +1,5 @@
 <?xml version="1.0" encoding="UTF-8"?>
-<project
+<project xmlns="http://maven.apache.org/POM/4.0.0"
-    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>
@@ -8,6 +7,7 @@
     <version>0.1.0-SNAPSHOT</version>
     <name>core-java-8</name>
     <packaging>jar</packaging>
+    
     <parent>
         <groupId>com.baeldung.core-java-modules</groupId>
         <artifactId>core-java-modules</artifactId>

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

@@ -1,6 +1,5 @@
 <?xml version="1.0" encoding="UTF-8"?>
-<project
+<project xmlns="http://maven.apache.org/POM/4.0.0"
-    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>

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

@@ -1,6 +1,5 @@
 <?xml version="1.0" encoding="UTF-8"?>
-<project
+<project xmlns="http://maven.apache.org/POM/4.0.0"
-    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>

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

@@ -1,6 +1,5 @@
 <?xml version="1.0" encoding="UTF-8"?>
-<project
+<project xmlns="http://maven.apache.org/POM/4.0.0"
-    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>
@@ -40,6 +39,7 @@
             <scope>test</scope>
         </dependency>
     </dependencies>
+    
     <profiles>
         <profile>
             <id>incubator-features</id>
@@ -131,6 +131,7 @@
             </build>
         </profile>
     </profiles>
+    
     <build>
         <finalName>core-java-9-new-features</finalName>
         <plugins>

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

@@ -1,6 +1,5 @@
 <?xml version="1.0" encoding="UTF-8"?>
-<project
+<project xmlns="http://maven.apache.org/POM/4.0.0"
-    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>
@@ -8,6 +7,7 @@
     <version>0.1.0-SNAPSHOT</version>
     <name>core-java-9-streams</name>
     <packaging>jar</packaging>
+    
     <parent>
         <groupId>com.baeldung.core-java-modules</groupId>
         <artifactId>core-java-modules</artifactId>

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

@@ -1,6 +1,5 @@
 <?xml version="1.0" encoding="UTF-8"?>
-<project
+<project xmlns="http://maven.apache.org/POM/4.0.0"
-    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>

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

@@ -1,6 +1,5 @@
 <?xml version="1.0" encoding="UTF-8"?>
-<project
+<project xmlns="http://maven.apache.org/POM/4.0.0"
-    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>

core-java-modules/core-java-annotations/src/test/java/com/baeldung/customannotations/ObjectToJsonConverterUnitTest.java

@@ -5,7 +5,7 @@ import static org.junit.jupiter.api.Assertions.assertThrows;
 
 import org.junit.jupiter.api.Test;
 
-public class JsonSerializerUnitTest {
+public class ObjectToJsonConverterUnitTest {
 
     @Test
     public void givenObjectNotSerializedThenExceptionThrown() throws JsonSerializationException {

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

@@ -2,16 +2,16 @@
 <project xmlns="http://maven.apache.org/POM/4.0.0"
     xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
     xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
+    <modelVersion>4.0.0</modelVersion>
+    <artifactId>core-java-arrays-convert</artifactId>
+    <name>core-java-arrays-convert</name>
+    <packaging>jar</packaging>
+
     <parent>
         <artifactId>core-java-modules</artifactId>
         <groupId>com.baeldung.core-java-modules</groupId>
         <version>0.0.1-SNAPSHOT</version>
     </parent>
-    <modelVersion>4.0.0</modelVersion>
-
-    <artifactId>core-java-arrays-convert</artifactId>
-    <name>core-java-arrays-convert</name>
-    <packaging>jar</packaging>
 
     <dependencies>
         <dependency>
@@ -24,4 +24,5 @@
     <properties>
         <guava.version>28.2-jre</guava.version>
     </properties>
+
 </project>

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

@@ -2,16 +2,16 @@
 <project xmlns="http://maven.apache.org/POM/4.0.0"
     xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
     xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
+    <modelVersion>4.0.0</modelVersion>
+    <artifactId>core-java-arrays-guides</artifactId>
+    <name>core-java-arrays-guides</name>
+    <packaging>jar</packaging>
+
     <parent>
         <artifactId>core-java-modules</artifactId>
         <groupId>com.baeldung.core-java-modules</groupId>
         <version>0.0.1-SNAPSHOT</version>
     </parent>
-    <modelVersion>4.0.0</modelVersion>
-
-    <artifactId>core-java-arrays-guides</artifactId>
-    <name>core-java-arrays-guides</name>
-    <packaging>jar</packaging>
 
     <dependencies>
         <dependency>
@@ -31,4 +31,5 @@
             <scope>test</scope>
         </dependency>
     </dependencies>
+
 </project>

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

@@ -2,14 +2,15 @@
 <project xmlns="http://maven.apache.org/POM/4.0.0"
     xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
     xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
+    <modelVersion>4.0.0</modelVersion>
+    <artifactId>core-java-arrays-multidimensional</artifactId>
+    <name>core-java-arrays-multidimensional</name>
+    <packaging>jar</packaging>
+
     <parent>
         <artifactId>core-java-modules</artifactId>
         <groupId>com.baeldung.core-java-modules</groupId>
         <version>0.0.1-SNAPSHOT</version>
     </parent>
-    <modelVersion>4.0.0</modelVersion>
 
-    <artifactId>core-java-arrays-multidimensional</artifactId>
-    <name>core-java-arrays-multidimensional</name>
-    <packaging>jar</packaging>
 </project>

core-java-modules/core-java-arrays-operations-advanced/README.md

@@ -9,3 +9,4 @@ This module contains articles about advanced operations on arrays in Java. They
 - [Find Sum and Average in a Java Array](https://www.baeldung.com/java-array-sum-average)
 - [Intersection Between two Integer Arrays](https://www.baeldung.com/java-array-intersection)
 - [Comparing Arrays in Java](https://www.baeldung.com/java-comparing-arrays)
+- [Concatenate Two Arrays in Java](https://www.baeldung.com/java-concatenate-arrays)

core-java-modules/core-java-arrays-operations-advanced/pom.xml

@@ -2,16 +2,16 @@
 <project xmlns="http://maven.apache.org/POM/4.0.0"
     xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
     xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
+    <modelVersion>4.0.0</modelVersion>
+    <artifactId>core-java-arrays-operations-advanced</artifactId>
+    <name>core-java-arrays-operations-advanced</name>
+    <packaging>jar</packaging>
+
     <parent>
         <artifactId>core-java-modules</artifactId>
         <groupId>com.baeldung.core-java-modules</groupId>
         <version>0.0.1-SNAPSHOT</version>
     </parent>
-    <modelVersion>4.0.0</modelVersion>
-
-    <artifactId>core-java-arrays-operations-advanced</artifactId>
-    <name>core-java-arrays-operations-advanced</name>
-    <packaging>jar</packaging>
 
     <dependencies>
         <dependency>
@@ -31,4 +31,5 @@
     <properties>
         <assertj-core.version>3.10.0</assertj-core.version>
     </properties>
+
 </project>

core-java-modules/core-java-arrays-operations-advanced/src/main/java/com/baeldung/arrayconcat/ArrayConcatUtil.java

@@ -0,0 +1,65 @@
+package com.baeldung.arrayconcat;
+
+import java.lang.reflect.Array;
+import java.util.ArrayList;
+import java.util.Arrays;
+import java.util.Collections;
+import java.util.List;
+import java.util.stream.IntStream;
+import java.util.stream.Stream;
+
+public class ArrayConcatUtil {
+    private ArrayConcatUtil() {}
+
+    static <T> T[] concatWithCollection(T[] array1, T[] array2) {
+        List<T> resultList = new ArrayList<>(array1.length + array2.length);
+        Collections.addAll(resultList, array1);
+        Collections.addAll(resultList, array2);
+
+        @SuppressWarnings("unchecked")
+        //the type cast is safe as the array1 has the type T[]
+        T[] resultArray = (T[]) Array.newInstance(array1.getClass().getComponentType(), 0);
+        return resultList.toArray(resultArray);
+    }
+
+    static <T> T[] concatWithArrayCopy(T[] array1, T[] array2) {
+        T[] result = Arrays.copyOf(array1, array1.length + array2.length);
+        System.arraycopy(array2, 0, result, array1.length, array2.length);
+        return result;
+    }
+
+    static <T> T concatWithCopy2(T array1, T array2) {
+        if (!array1.getClass().isArray() || !array2.getClass().isArray()) {
+            throw new IllegalArgumentException("Only arrays are accepted.");
+        }
+
+        Class<?> compType1 = array1.getClass().getComponentType();
+        Class<?> compType2 = array2.getClass().getComponentType();
+
+        if (!compType1.equals(compType2)) {
+            throw new IllegalArgumentException("Two arrays have different types.");
+        }
+
+        int len1 = Array.getLength(array1);
+        int len2 = Array.getLength(array2);
+
+        @SuppressWarnings("unchecked")
+        //the cast is safe due to the previous checks
+        T result = (T) Array.newInstance(compType1, len1 + len2);
+
+        System.arraycopy(array1, 0, result, 0, len1);
+        System.arraycopy(array2, 0, result, len1, len2);
+
+        return result;
+    }
+
+    @SuppressWarnings("unchecked")
+    static <T> T[] concatWithStream(T[] array1, T[] array2) {
+        return Stream.concat(Arrays.stream(array1), Arrays.stream(array2))
+                     .toArray(size -> (T[]) Array.newInstance(array1.getClass().getComponentType(), size));
+    }
+
+    static int[] concatIntArraysWithIntStream(int[] array1, int[] array2) {
+        return IntStream.concat(Arrays.stream(array1), Arrays.stream(array2)).toArray();
+    }
+}

core-java-modules/core-java-arrays-operations-advanced/src/test/java/com/baeldung/arrayconcat/ArrayConcatUtilUnitTest.java

@@ -0,0 +1,99 @@
+package com.baeldung.arrayconcat;
+
+
+import com.google.common.collect.ObjectArrays;
+import com.google.common.primitives.Ints;
+import org.apache.commons.lang3.ArrayUtils;
+import org.junit.Test;
+
+import static org.assertj.core.api.Assertions.assertThat;
+import static org.assertj.core.api.Assertions.fail;
+
+public class ArrayConcatUtilUnitTest {
+    private final String[] strArray1 = { "element 1", "element 2", "element 3" };
+    private final String[] strArray2 = { "element 4", "element 5" };
+    private final String[] expectedStringArray = { "element 1", "element 2", "element 3", "element 4", "element 5" };
+
+    private final int[] intArray1 = { 0, 1, 2, 3 };
+    private final int[] intArray2 = { 4, 5, 6, 7 };
+    private final int[] expectedIntArray = { 0, 1, 2, 3, 4, 5, 6, 7 };
+
+    @Test
+    public void givenTwoStringArrays_whenConcatWithList_thenGetExpectedResult() {
+        String[] result = ArrayConcatUtil.concatWithCollection(strArray1, strArray2);
+        assertThat(result).isEqualTo(expectedStringArray);
+    }
+
+    @Test
+    public void givenTwoStringArrays_whenConcatWithCopy_thenGetExpectedResult() {
+        String[] result = ArrayConcatUtil.concatWithArrayCopy(strArray1, strArray2);
+        assertThat(result).isEqualTo(expectedStringArray);
+    }
+
+    @Test
+    public void givenTwoStrings_whenConcatWithCopy2_thenGetException() {
+        String exMsg = "Only arrays are accepted.";
+        try {
+            ArrayConcatUtil.concatWithCopy2("String Nr. 1", "String Nr. 2");
+            fail(String.format("IllegalArgumentException with message:'%s' should be thrown. But it didn't", exMsg));
+        } catch (IllegalArgumentException e) {
+            assertThat(e).hasMessage(exMsg);
+        }
+    }
+
+    @Test
+    public void givenTwoArraysInDifferentTypes_whenConcatWithCopy2_thenGetException() {
+        String[] strArray = new String[] { "test 1", "test 2" };
+        Integer[] integerArray = new Integer[] { 7, 11 };
+        String exMsg = "Two arrays have different types.";
+
+        try {
+            ArrayConcatUtil.concatWithCopy2(strArray, integerArray);
+            fail(String.format("IllegalArgumentException with message:'%s' should be thrown. But it didn't", exMsg));
+        } catch (IllegalArgumentException e) {
+            assertThat(e).hasMessage(exMsg);
+        }
+    }
+
+    @Test
+    public void givenTwoArrays_whenConcatWithCopy2_thenGetExpectedResult() {
+        String[] result = ArrayConcatUtil.concatWithCopy2(strArray1, strArray2);
+        assertThat(result).isEqualTo(expectedStringArray);
+
+        int[] intResult = ArrayConcatUtil.concatWithCopy2(intArray1, intArray2);
+        assertThat(intResult).isEqualTo(expectedIntArray);
+    }
+
+    @Test
+    public void givenTwoStringArrays_whenConcatWithStream_thenGetExpectedResult() {
+        String[] result = ArrayConcatUtil.concatWithStream(strArray1, strArray2);
+        assertThat(result).isEqualTo(expectedStringArray);
+    }
+
+    @Test
+    public void givenTwoIntArrays_whenConcatWithIntStream_thenGetExpectedResult() {
+        int[] intResult = ArrayConcatUtil.concatIntArraysWithIntStream(intArray1, intArray2);
+        assertThat(intResult).isEqualTo(expectedIntArray);
+    }
+
+    @Test
+    public void givenTwoArrays_whenConcatWithCommonsLang_thenGetExpectedResult() {
+        String[] result = ArrayUtils.addAll(strArray1, strArray2);
+        assertThat(result).isEqualTo(expectedStringArray);
+
+        int[] intResult = ArrayUtils.addAll(intArray1, intArray2);
+        assertThat(intResult).isEqualTo(expectedIntArray);
+    }
+
+    @Test
+    public void givenTwoStringArrays_whenConcatWithGuava_thenGetExpectedResult() {
+        String[] result = ObjectArrays.concat(strArray1, strArray2, String.class);
+        assertThat(result).isEqualTo(expectedStringArray);
+    }
+
+    @Test
+    public void givenTwoIntArrays_whenConcatWithGuava_thenGetExpectedResult() {
+        int[] intResult = Ints.concat(intArray1, intArray2);
+        assertThat(intResult).isEqualTo(expectedIntArray);
+    }
+}

core-java-modules/core-java-arrays-operations-basic/pom.xml

@@ -2,16 +2,16 @@
 <project xmlns="http://maven.apache.org/POM/4.0.0"
     xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
     xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
+    <modelVersion>4.0.0</modelVersion>
+    <artifactId>core-java-arrays-operations-basic</artifactId>
+    <name>core-java-arrays-operations-basic</name>
+    <packaging>jar</packaging>
+
     <parent>
         <artifactId>core-java-modules</artifactId>
         <groupId>com.baeldung.core-java-modules</groupId>
         <version>0.0.1-SNAPSHOT</version>
     </parent>
-    <modelVersion>4.0.0</modelVersion>
-
-    <artifactId>core-java-arrays-operations-basic</artifactId>
-    <name>core-java-arrays-operations-basic</name>
-    <packaging>jar</packaging>
 
     <dependencies>
         <dependency>
@@ -19,7 +19,6 @@
             <artifactId>commons-lang3</artifactId>
             <version>${commons-lang3.version}</version>
         </dependency>
-
         <!-- Benchmarking -->
         <dependency>
             <groupId>org.openjdk.jmh</groupId>
@@ -31,7 +30,6 @@
             <artifactId>jmh-generator-annprocess</artifactId>
             <version>${jmh-generator.version}</version>
         </dependency>
-
         <dependency>
             <groupId>org.assertj</groupId>
             <artifactId>assertj-core</artifactId>
@@ -55,7 +53,8 @@
                         <configuration>
                             <finalName>benchmarks</finalName>
                             <transformers>
-                                <transformer implementation="org.apache.maven.plugins.shade.resource.ManifestResourceTransformer">
+                                <transformer
+                                    implementation="org.apache.maven.plugins.shade.resource.ManifestResourceTransformer">
                                     <mainClass>org.openjdk.jmh.Main</mainClass>
                                 </transformer>
                             </transformers>
@@ -70,4 +69,5 @@
         <shade.plugin.version>3.2.0</shade.plugin.version>
         <assertj-core.version>3.10.0</assertj-core.version>
     </properties>
+
 </project>

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

@@ -2,17 +2,17 @@
 <project xmlns="http://maven.apache.org/POM/4.0.0"
     xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
     xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
+    <modelVersion>4.0.0</modelVersion>
+    <artifactId>core-java-arrays-sorting</artifactId>
+    <name>core-java-arrays-sorting</name>
+    <packaging>jar</packaging>
+
     <parent>
         <artifactId>core-java-modules</artifactId>
         <groupId>com.baeldung.core-java-modules</groupId>
         <version>0.0.1-SNAPSHOT</version>
         <relativePath>../</relativePath>
     </parent>
-    <modelVersion>4.0.0</modelVersion>
-
-    <artifactId>core-java-arrays-sorting</artifactId>
-    <name>core-java-arrays-sorting</name>
-    <packaging>jar</packaging>
 
     <dependencies>
         <!-- Utilities -->
@@ -26,7 +26,6 @@
             <artifactId>guava</artifactId>
             <version>${guava.version}</version>
         </dependency>
-
         <!-- Benchmarking -->
         <dependency>
             <groupId>org.openjdk.jmh</groupId>
@@ -38,7 +37,6 @@
             <artifactId>jmh-generator-annprocess</artifactId>
             <version>${jmh-generator.version}</version>
         </dependency>
-
         <!-- Testing -->
         <dependency>
             <groupId>org.assertj</groupId>
@@ -63,7 +61,8 @@
                         <configuration>
                             <finalName>benchmarks</finalName>
                             <transformers>
-                                <transformer implementation="org.apache.maven.plugins.shade.resource.ManifestResourceTransformer">
+                                <transformer
+                                    implementation="org.apache.maven.plugins.shade.resource.ManifestResourceTransformer">
                                     <mainClass>org.openjdk.jmh.Main</mainClass>
                                 </transformer>
                             </transformers>

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

@@ -1,6 +1,5 @@
 <?xml version="1.0" encoding="UTF-8"?>
-<project
+<project xmlns="http://maven.apache.org/POM/4.0.0"
-        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>
@@ -8,6 +7,7 @@
     <version>0.1.0-SNAPSHOT</version>
     <name>core-java-char</name>
     <packaging>jar</packaging>
+    
     <parent>
         <groupId>com.baeldung.core-java-modules</groupId>
         <artifactId>core-java-modules</artifactId>

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

@@ -1,12 +1,12 @@
 <?xml version="1.0" encoding="UTF-8"?>
-<project
+<project xmlns="http://maven.apache.org/POM/4.0.0"
-    xmlns="http://maven.apache.org/POM/4.0.0"
     xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
     xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
     <modelVersion>4.0.0</modelVersion>
     <artifactId>core-java-collections-2</artifactId>
     <name>core-java-collections-2</name>
     <packaging>jar</packaging>
+    
     <parent>
         <groupId>com.baeldung.core-java-modules</groupId>
         <artifactId>core-java-modules</artifactId>

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

@@ -1,6 +1,5 @@
 <?xml version="1.0" encoding="UTF-8"?>
-<project
+<project xmlns="http://maven.apache.org/POM/4.0.0"
-    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>
@@ -8,6 +7,7 @@
     <version>0.1.0-SNAPSHOT</version>
     <name>core-java-collections-3</name>
     <packaging>jar</packaging>
+    
     <parent>
         <groupId>com.baeldung.core-java-modules</groupId>
         <artifactId>core-java-modules</artifactId>

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

@@ -1,6 +1,5 @@
 <?xml version="1.0" encoding="UTF-8"?>
-<project
+<project xmlns="http://maven.apache.org/POM/4.0.0"
-    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>
@@ -8,6 +7,7 @@
     <version>0.1.0-SNAPSHOT</version>
     <name>core-java-collections-4</name>
     <packaging>jar</packaging>
+    
     <parent>
         <groupId>com.baeldung.core-java-modules</groupId>
         <artifactId>core-java-modules</artifactId>

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

@@ -1,6 +1,5 @@
 <?xml version="1.0" encoding="UTF-8"?>
-<project
+<project xmlns="http://maven.apache.org/POM/4.0.0"
-    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>
@@ -8,6 +7,7 @@
     <version>0.1.0-SNAPSHOT</version>
     <name>core-java-collections-array-list</name>
     <packaging>jar</packaging>
+
     <parent>
         <groupId>com.baeldung.core-java-modules</groupId>
         <artifactId>core-java-modules</artifactId>

core-java-modules/core-java-collections-list-2/pom.xml

@@ -1,6 +1,5 @@
 <?xml version="1.0" encoding="UTF-8"?>
-<project
+<project xmlns="http://maven.apache.org/POM/4.0.0"
-    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>
@@ -8,6 +7,7 @@
     <version>0.1.0-SNAPSHOT</version>
     <name>core-java-collections-list-2</name>
     <packaging>jar</packaging>
+
     <parent>
         <groupId>com.baeldung.core-java-modules</groupId>
         <artifactId>core-java-modules</artifactId>

core-java-modules/core-java-collections-list-3/pom.xml

@@ -1,6 +1,5 @@
 <?xml version="1.0" encoding="UTF-8"?>
-<project
+<project xmlns="http://maven.apache.org/POM/4.0.0"
-    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>
@@ -8,6 +7,7 @@
     <version>0.1.0-SNAPSHOT</version>
     <name>core-java-collections-list-3</name>
     <packaging>jar</packaging>
+
     <parent>
         <groupId>com.baeldung.core-java-modules</groupId>
         <artifactId>core-java-modules</artifactId>
@@ -33,7 +33,6 @@
             <version>${assertj.version}</version>
             <scope>test</scope>
         </dependency>
-
         <dependency>
             <groupId>net.sf.trove4j</groupId>
             <artifactId>trove4j</artifactId>
@@ -49,7 +48,6 @@
             <artifactId>colt</artifactId>
             <version>${colt.version}</version>
         </dependency>
-
         <dependency>
             <groupId>org.openjdk.jmh</groupId>
             <artifactId>jmh-core</artifactId>

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

@@ -1,6 +1,5 @@
 <?xml version="1.0" encoding="UTF-8"?>
-<project
+<project xmlns="http://maven.apache.org/POM/4.0.0"
-    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>
@@ -8,6 +7,7 @@
     <version>0.1.0-SNAPSHOT</version>
     <name>core-java-collections-list</name>
     <packaging>jar</packaging>
+
     <parent>
         <groupId>com.baeldung.core-java-modules</groupId>
         <artifactId>core-java-modules</artifactId>

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

@@ -1,11 +1,14 @@
 package com.baeldung.collections;
 
+import static org.hamcrest.Matchers.containsInAnyOrder;
+import static org.hamcrest.Matchers.containsInRelativeOrder;
 import static org.hamcrest.Matchers.hasSize;
 import static org.junit.Assert.assertThat;
 
 import java.util.ArrayList;
 import java.util.Collections;
 import java.util.HashSet;
+import java.util.LinkedHashSet;
 import java.util.List;
 
 import org.apache.commons.collections4.CollectionUtils;
@@ -22,7 +25,7 @@ public class JavaCollectionCleanupUnitTest {
     // tests - removing nulls
 
     @Test
-    public final void givenListContainsNulls_whenRemovingNullsWithPlainJava_thenCorrect() {
+    public void givenListContainsNulls_whenRemovingNullsWithPlainJava_thenCorrect() {
         final List<Integer> list = Lists.newArrayList(null, 1, null);
         while (list.remove(null))
             ;
@@ -31,7 +34,7 @@ public class JavaCollectionCleanupUnitTest {
     }
 
     @Test
-    public final void givenListContainsNulls_whenRemovingNullsWithPlainJavaAlternative_thenCorrect() {
+    public void givenListContainsNulls_whenRemovingNullsWithPlainJavaAlternative_thenCorrect() {
         final List<Integer> list = Lists.newArrayList(null, 1, null);
         list.removeAll(Collections.singleton(null));
 
@@ -39,7 +42,7 @@ public class JavaCollectionCleanupUnitTest {
     }
 
     @Test
-    public final void givenListContainsNulls_whenRemovingNullsWithGuavaV1_thenCorrect() {
+    public void givenListContainsNulls_whenRemovingNullsWithGuavaV1_thenCorrect() {
         final List<Integer> list = Lists.newArrayList(null, 1, null);
         Iterables.removeIf(list, Predicates.isNull());
 
@@ -47,7 +50,7 @@ public class JavaCollectionCleanupUnitTest {
     }
 
     @Test
-    public final void givenListContainsNulls_whenRemovingNullsWithGuavaV2_thenCorrect() {
+    public void givenListContainsNulls_whenRemovingNullsWithGuavaV2_thenCorrect() {
         final List<Integer> list = Lists.newArrayList(null, 1, null, 2, 3);
         final List<Integer> listWithoutNulls = Lists.newArrayList(Iterables.filter(list, Predicates.notNull()));
 
@@ -55,7 +58,7 @@ public class JavaCollectionCleanupUnitTest {
     }
 
     @Test
-    public final void givenListContainsNulls_whenRemovingNullsWithCommonsCollections_thenCorrect() {
+    public void givenListContainsNulls_whenRemovingNullsWithCommonsCollections_thenCorrect() {
         final List<Integer> list = Lists.newArrayList(null, 1, 2, null, 3, null);
         CollectionUtils.filter(list, PredicateUtils.notNullPredicate());
 
@@ -65,19 +68,38 @@ public class JavaCollectionCleanupUnitTest {
     // tests - remove duplicates
 
     @Test
-    public final void givenListContainsDuplicates_whenRemovingDuplicatesWithPlainJava_thenCorrect() {
+    public void givenListContainsDuplicates_whenRemovingDuplicatesWithPlainJava_thenCorrect() {
-        final List<Integer> listWithDuplicates = Lists.newArrayList(0, 1, 2, 3, 0, 0);
+        final List<Integer> listWithDuplicates = Lists.newArrayList(5, 0, 3, 1, 2, 3, 0, 0);
         final List<Integer> listWithoutDuplicates = new ArrayList<>(new HashSet<>(listWithDuplicates));
 
-        assertThat(listWithoutDuplicates, hasSize(4));
+        assertThat(listWithoutDuplicates, hasSize(5));
+        assertThat(listWithoutDuplicates, containsInAnyOrder(5, 0, 3, 1, 2));
     }
 
     @Test
-    public final void givenListContainsDuplicates_whenRemovingDuplicatesWithGuava_thenCorrect() {
+    public void givenListContainsDuplicates_whenRemovingDuplicatesPreservingOrderWithPlainJava_thenCorrect() {
-        final List<Integer> listWithDuplicates = Lists.newArrayList(0, 1, 2, 3, 0, 0);
+        final List<Integer> listWithDuplicates = Lists.newArrayList(5, 0, 3, 1, 2, 3, 0, 0);
-        final List<Integer> listWithoutDuplicates = Lists.newArrayList(Sets.newHashSet(listWithDuplicates));
+        final List<Integer> listWithoutDuplicates = new ArrayList<>(new LinkedHashSet<>(listWithDuplicates));
 
-        assertThat(listWithoutDuplicates, hasSize(4));
+        assertThat(listWithoutDuplicates, hasSize(5));
+        assertThat(listWithoutDuplicates, containsInRelativeOrder(5, 0, 3, 1, 2));
     }
 
+    @Test
+    public void givenListContainsDuplicates_whenRemovingDuplicatesWithGuava_thenCorrect() {
+        final List<Integer> listWithDuplicates = Lists.newArrayList(5, 0, 3, 1, 2, 3, 0, 0);
+        final List<Integer> listWithoutDuplicates = Lists.newArrayList(Sets.newHashSet(listWithDuplicates));
+
+        assertThat(listWithoutDuplicates, hasSize(5));
+        assertThat(listWithoutDuplicates, containsInAnyOrder(5, 0, 3, 1, 2));
+    }
+
+    @Test
+    public void givenListContainsDuplicates_whenRemovingDuplicatesPreservingOrderWithGuava_thenCorrect() {
+        final List<Integer> listWithDuplicates = Lists.newArrayList(5, 0, 3, 1, 2, 3, 0, 0);
+        final List<Integer> listWithoutDuplicates = Lists.newArrayList(Sets.newLinkedHashSet(listWithDuplicates));
+
+        assertThat(listWithoutDuplicates, hasSize(5));
+        assertThat(listWithoutDuplicates, containsInRelativeOrder(5, 0, 3, 1, 2));
+    }
 }

core-java-modules/core-java-collections-list/src/test/java/com/baeldung/java8/Java8CollectionCleanupUnitTest.java

@@ -7,6 +7,7 @@ import java.util.List;
 import java.util.Objects;
 import java.util.stream.Collectors;
 
+import static org.hamcrest.Matchers.containsInAnyOrder;
 import static org.hamcrest.Matchers.hasSize;
 import static org.junit.Assert.assertThat;
 
@@ -40,10 +41,11 @@ public class Java8CollectionCleanupUnitTest {
 
     @Test
     public void givenListContainsDuplicates_whenRemovingDuplicatesWithJava8_thenCorrect() {
-        final List<Integer> listWithDuplicates = Lists.newArrayList(1, 1, 2, 2, 3, 3);
+        final List<Integer> listWithDuplicates = Lists.newArrayList(5, 0, 3, 1, 2, 3, 0, 0);
-        final List<Integer> listWithoutDuplicates = listWithDuplicates.parallelStream().distinct().collect(Collectors.toList());
+        final List<Integer> listWithoutDuplicates = listWithDuplicates.stream().distinct().collect(Collectors.toList());
 
-        assertThat(listWithoutDuplicates, hasSize(3));
+        assertThat(listWithoutDuplicates, hasSize(5));
+        assertThat(listWithoutDuplicates, containsInAnyOrder(5, 0, 3, 1, 2));
     }
 
 }

core-java-modules/core-java-collections-maps-2/pom.xml

@@ -7,6 +7,7 @@
     <version>0.1.0-SNAPSHOT</version>
     <name>core-java-collections-maps-2</name>
     <packaging>jar</packaging>
+
     <parent>
         <groupId>com.baeldung.core-java-modules</groupId>
         <artifactId>core-java-modules</artifactId>