Established TCP socket on 45089
&lt;===[JENKINS REMOTING CAPACITY]===&gt;   channel started
Executing Maven:  -B -f /home/tomcat/.jenkins/workspace/ChestShop/pom.xml clean install
[INFO] Scanning for projects...
[INFO] 
[INFO] ------------------&lt; com.acrobot.chestshop:chestshop &gt;-------------------
[INFO] Building chestshop 3.9.0-brokko-SNAPSHOT
[INFO] --------------------------------[ jar ]---------------------------------
[INFO] 
[INFO] --- maven-clean-plugin:2.5:clean (default-clean) @ chestshop ---
[INFO] Deleting /home/tomcat/.jenkins/workspace/ChestShop/target
[INFO] 
[INFO] --- maven-resources-plugin:2.6:resources (default-resources) @ chestshop ---
[INFO] Using 'UTF-8' encoding to copy filtered resources.
[INFO] Copying 1 resource
[INFO] 
[INFO] --- maven-compiler-plugin:2.3.2:compile (default-compile) @ chestshop ---
[INFO] Compiling 125 source files to /home/tomcat/.jenkins/workspace/ChestShop/target/classes
[INFO] -------------------------------------------------------------
[ERROR] COMPILATION ERROR : 
[INFO] -------------------------------------------------------------
[ERROR] /home/tomcat/.jenkins/workspace/ChestShop/src/main/java/com/Acrobot/ChestShop/Plugins/WorldGuardFlags.java:[13,30] error: &lt;T&gt;register(T) has private access in Flags
[INFO] 1 error
[INFO] -------------------------------------------------------------
[INFO] ------------------------------------------------------------------------
[INFO] BUILD FAILURE
[INFO] ------------------------------------------------------------------------
[INFO] Total time: 2.981 s
[INFO] Finished at: 2019-05-06T06:01:28+02:00
[INFO] ------------------------------------------------------------------------
Warte bis Jenkins die Datensammlung abgeschlossen hat
[ERROR] Failed to execute goal org.apache.maven.plugins:maven-compiler-plugin:2.3.2:compile (default-compile) on project chestshop: Compilation failure
[ERROR] /home/tomcat/.jenkins/workspace/ChestShop/src/main/java/com/Acrobot/ChestShop/Plugins/WorldGuardFlags.java:[13,30] error: &lt;T&gt;register(T) has private access in Flags
[ERROR] -&gt; [Help 1]
[ERROR] 
[ERROR] To see the full stack trace of the errors, re-run Maven with the -e switch.
[ERROR] Re-run Maven using the -X switch to enable full debug logging.
[ERROR] 
[ERROR] For more information about the errors and possible solutions, please read the following articles:
[ERROR] [Help 1] <a href='http://cwiki.apache.org/confluence/display/MAVEN/MojoFailureException'>http://cwiki.apache.org/confluence/display/MAVEN/MojoFailureException</a>