Add single property to configure Toolchains & Compiler plugins

Author: bannmann

pom.xml

@@ -34,13 +34,15 @@
 
     <properties>
         <base.central.deploymentName>${project.url} - ${project.version}</base.central.deploymentName>
-        <base.toolchains.jdk>11</base.toolchains.jdk>
+        <!-- configures Toolchains and Compiler plugins -->
+        <base.java>11</base.java>
+        <base.toolchains.jdk>${base.java}</base.toolchains.jdk>
         <!-- use this to skip the versions plugin in BOM projects as it would report nonsense -->
         <base.versionsPlugin.enabled>true</base.versionsPlugin.enabled>
         <lombok.core.version>1.18.36</lombok.core.version>
         <lombok.plugin.version>1.18.20.0</lombok.plugin.version>
-        <maven.compiler.source>11</maven.compiler.source>
-        <maven.compiler.target>11</maven.compiler.target>
+        <maven.compiler.source>${base.java}</maven.compiler.source>
+        <maven.compiler.target>${base.java}</maven.compiler.target>
         <mizool.version>0.52</mizool.version>
         <mockito-core.version>3.3.3</mockito-core.version>
         <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>