pom: require java11

time to move on ...

Acked-by: Lea Morschel
Target: master

pom.xml

@@ -45,6 +45,7 @@
 
   <properties>
       <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
+      <java.version>11</java.version>
   </properties>
 
   <build>
@@ -61,12 +62,13 @@
         <plugin>
             <groupId>org.apache.maven.plugins</groupId>
             <artifactId>maven-compiler-plugin</artifactId>
-            <version>3.7.0</version>
+            <version>3.8.1</version>
             <configuration>
-                <source>1.8</source>
-                <target>1.8</target>
                 <showDeprecation>true</showDeprecation>
-                <encoding>UTF-8</encoding>
+                <release>${java.version}</release>
+                <!-- without forking compilation happens in the
+                same process, so no arguments are applied -->
+                <fork>true</fork>
             </configuration>
         </plugin>
 	<plugin>