[JAVA-21185] Clean up

maven-modules/compiler-plugin-java-9/pom.xml

@@ -3,10 +3,16 @@
     xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
     xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
     <modelVersion>4.0.0</modelVersion>
-    <groupId>com.baeldung</groupId>
     <artifactId>compiler-plugin-java-9</artifactId>
     <version>0.0.1-SNAPSHOT</version>
 
+    <parent>
+        <groupId>com.baeldung</groupId>
+        <artifactId>maven-modules</artifactId>
+        <version>0.0.1-SNAPSHOT</version>
+    </parent>
+
+
     <build>
         <plugins>
             <plugin>

maven-modules/dependency-exclusion/pom.xml

@@ -14,10 +14,6 @@
         <version>0.0.1-SNAPSHOT</version>
     </parent>
 
-    <properties>
-        <surefire-version>2.22.2</surefire-version>
-    </properties>
-
     <modules>
         <module>dummy-surefire-junit47</module>
         <module>core-java-exclusions</module>
@@ -29,10 +25,10 @@
                 <plugin>
                     <groupId>org.apache.maven.plugins</groupId>
                     <artifactId>maven-compiler-plugin</artifactId>
-                    <version>3.7.0</version>
+                    <version>${maven-compiler-plugin.version}</version>
                     <configuration>
-                        <source>1.8</source>
-                        <target>1.8</target>
+                        <source>${maven-compiler-plugin.source.version}</source>
+                        <target>${maven-compiler-plugin.tagert.version}</target>
                         <compilerArgs>
                             <arg>-parameters</arg>
                         </compilerArgs>
@@ -62,9 +58,16 @@
             <dependency>
                 <groupId>junit</groupId>
                 <artifactId>junit</artifactId>
-                <version>4.13</version>
+                <version>${junit.version}</version>
             </dependency>
         </dependencies>
     </dependencyManagement>
 
+    <properties>
+        <maven-compiler-plugin.version>3.7.0</maven-compiler-plugin.version>
+        <maven-compiler-plugin.source.version>1.8</maven-compiler-plugin.source.version>
+        <maven-compiler-plugin.tagert.version>1.8</maven-compiler-plugin.tagert.version>
+        <junit.version>4.13</junit.version>
+    </properties>
+
 </project>

maven-modules/host-maven-repo-example/pom.xml

@@ -66,7 +66,7 @@
             <plugin>
                 <groupId>org.apache.maven.plugins</groupId>
                 <artifactId>maven-source-plugin</artifactId>
-                <version>3.1.0</version>
+                <version>${maven-source-plugin.version}</version>
                 <executions>
                     <execution>
                         <id>attach-sources</id>
@@ -106,6 +106,7 @@
         <github.global.server>github</github.global.server>
         <maven.compiler.source>8</maven.compiler.source>
         <maven.compiler.target>8</maven.compiler.target>
+        <maven-source-plugin.version>3.1.0</maven-source-plugin.version>
     </properties>
 
 </project>

maven-modules/maven-builder-plugin/pom.xml

@@ -12,7 +12,7 @@
             <plugin>
                 <groupId>org.codehaus.mojo</groupId>
                 <artifactId>build-helper-maven-plugin</artifactId>
-                <version>3.2.0</version>
+                <version>${build-helper-maven-plugin}</version>
                 <executions>
                     <execution>
                         <id>add-source</id>
@@ -35,6 +35,7 @@
         <maven.compiler.source>1.8</maven.compiler.source>
         <maven.compiler.target>1.8</maven.compiler.target>
         <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
+        <build-helper-maven-plugin>3.2.0</build-helper-maven-plugin>
     </properties>
 
 </project>

maven-modules/maven-classifier/maven-classifier-example-consumer/pom.xml

@@ -15,12 +15,12 @@
         <dependency>
             <groupId>com.baeldung</groupId>
             <artifactId>maven-classifier-example-provider</artifactId>
-            <version>0.0.1-SNAPSHOT</version>
+            <version>${maven-classifier-example-provider.version}</version>
         </dependency>
         <dependency>
             <groupId>com.baeldung</groupId>
             <artifactId>maven-classifier-example-provider</artifactId>
-            <version>0.0.1-SNAPSHOT</version>
+            <version>${maven-classifier-example-provider.version}</version>
             <classifier>arbitrary</classifier>
         </dependency>
         <!-- For example purpose not building as it requires both JDK 8 and 11 executables -->
@@ -34,13 +34,13 @@
         <dependency>
             <groupId>com.baeldung</groupId>
             <artifactId>maven-classifier-example-provider</artifactId>
-            <version>0.0.1-SNAPSHOT</version>
+            <version>${maven-classifier-example-provider.version}</version>
             <classifier>sources</classifier>
         </dependency>
         <dependency>
             <groupId>com.baeldung</groupId>
             <artifactId>maven-classifier-example-provider</artifactId>
-            <version>0.0.1-SNAPSHOT</version>
+            <version>${maven-classifier-example-provider.version}</version>
             <classifier>tests</classifier>
         </dependency>
     </dependencies>
@@ -48,6 +48,7 @@
     <properties>
         <maven.compiler.source>8</maven.compiler.source>
         <maven.compiler.target>8</maven.compiler.target>
+        <maven-classifier-example-provider.version>0.0.1-SNAPSHOT</maven-classifier-example-provider.version>
     </properties>
 
 </project>

maven-modules/maven-classifier/maven-classifier-example-provider/pom.xml

@@ -17,7 +17,7 @@
             <plugin>
                 <groupId>org.apache.maven.plugins</groupId>
                 <artifactId>maven-compiler-plugin</artifactId>
-                <version>3.10.0</version>
+                <version>${maven-compiler-plugin.version}</version>
                 <executions>
                     <execution>
                         <id>JDK 8</id>
@@ -52,7 +52,6 @@
             <plugin>
                 <groupId>org.apache.maven.plugins</groupId>
                 <artifactId>maven-jar-plugin</artifactId>
-                <version>3.2.2</version>
                 <executions>
                     <execution>
                         <id>Arbitrary</id>
@@ -87,7 +86,7 @@
             <plugin>
                 <groupId>org.apache.maven.plugins</groupId>
                 <artifactId>maven-source-plugin</artifactId>
-                <version>3.2.1</version>
+                <version>${maven-source-plugin.version}</version>
                 <executions>
                     <execution>
                         <id>attach-sources</id>
@@ -101,7 +100,7 @@
             <plugin>
                 <groupId>org.apache.maven.plugins</groupId>
                 <artifactId>maven-javadoc-plugin</artifactId>
-                <version>3.3.2</version>
+                <version>${maven-javadoc-plugin.version}</version>
                 <executions>
                     <execution>
                         <id>attach-javadocs</id>
@@ -117,6 +116,10 @@
     <properties>
         <maven.compiler.source>8</maven.compiler.source>
         <maven.compiler.target>8</maven.compiler.target>
+        <maven-compiler-plugin.version>3.10.0</maven-compiler-plugin.version>
+        <maven-javadoc-plugin.version>3.3.2</maven-javadoc-plugin.version>
+        <
+        <maven-source-plugin.version>3.2.1</maven-source-plugin.version>
         <!-- <jdk.11.executable.path></jdk.11.executable.path> -->
     </properties>