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[INFO] ------------------------------------------------------------------------
[INFO] Reactor Summary:
[INFO] 
[INFO] citizens-parent ................................... SUCCESS [3.951s]
[INFO] citizens-main ..................................... SUCCESS [2:16.437s]
[INFO] citizens-v1_10_R1 ................................. SUCCESS [44.858s]
[INFO] citizens-v1_11_R1 ................................. SUCCESS [1:12.271s]
[INFO] citizens-v1_12_R1 ................................. FAILURE [4.897s]
[INFO] citizens .......................................... SKIPPED
[INFO] ------------------------------------------------------------------------
[INFO] BUILD FAILURE
[INFO] ------------------------------------------------------------------------
[INFO] Total time: 4:28.110s
[INFO] Finished at: Fri Jun 02 12:39:47 GMT 2017
[INFO] Final Memory: 45M/238M
[INFO] ------------------------------------------------------------------------
[ERROR] Failed to execute goal org.apache.maven.plugins:maven-compiler-plugin:2.3.2:compile (default-compile) on project citizens-v1_12_R1: Compilation failure
[ERROR] /var/lib/jenkins/jobs/Citizens2/workspace/v1_12_R1/src/main/java/net/citizensnpcs/nms/v1_12_R1/util/PlayerPathfinderAbstract.java:[13,61] error: diamond operator is not supported in -source 1.6
[ERROR] -> [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] http://cwiki.apache.org/confluence/display/MAVEN/MojoFailureException
[ERROR] 
[ERROR] After correcting the problems, you can resume the build with the command
[ERROR]   mvn <goals> -rf :citizens-v1_12_R1
Started
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Finished: NOT_BUILT