13:59:50 [INFO] -------------------------------------------------------------
13:59:50 [ERROR] COMPILATION ERROR : 
13:59:50 [INFO] -------------------------------------------------------------
13:59:50 [ERROR] Failure executing javac, but could not parse the error:
13:59:50 javac: invalid target release: 1.8
13:59:50 Usage: javac <options> <source files>
13:59:50 use -help for a list of possible options

Nothing to do with checkstyle, but the slave should probably be upgraded.

CCing infra to do so.