Started calculate disk usage of build Finished Calculation of disk usage of build in 0 seconds Started calculate disk usage of workspace Finished Calculation of disk usage of workspace in 0 seconds [INFO] [INFO] ------------------------------------------------------------------------ [INFO] Building citizens-v1_12_R1 2.0.22-SNAPSHOT [INFO] ------------------------------------------------------------------------ [INFO] [INFO] --- maven-clean-plugin:2.4.1:clean (default-clean) @ citizens-v1_12_R1 --- [INFO] [INFO] --- maven-resources-plugin:2.4.3:resources (default-resources) @ citizens-v1_12_R1 --- [INFO] Using 'UTF-8' encoding to copy filtered resources. [INFO] skip non existing resourceDirectory /var/lib/jenkins/jobs/Citizens2/workspace/v1_12_R1/src/main/resources [INFO] [INFO] --- maven-compiler-plugin:2.3.2:compile (default-compile) @ citizens-v1_12_R1 --- [INFO] Compiling 105 source files to /var/lib/jenkins/jobs/Citizens2/workspace/v1_12_R1/target/classes [INFO] ------------------------------------------------------------- [ERROR] COMPILATION ERROR : [INFO] ------------------------------------------------------------- [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 [INFO] 1 error [INFO] -------------------------------------------------------------