FATAL: Remote call on JNLP4-connect connection from xxx.xxx.xxx.xxx failed Also: hudson.remoting.Channel$CallSiteStackTrace: Remote call to JNLP4-connect connection from xxx.xxx.xxx.xxx   at hudson.remoting.Channel.attachCallSiteStackTrace(Channel.java:1741) at hudson.remoting.UserResponse.retrieve(UserRequest.java:389) at hudson.remoting.Channel.call(Channel.java:955) at hudson.Launcher$RemoteLauncher.kill(Launcher.java:1078) at hudson.model.AbstractBuild$AbstractBuildExecution.run(AbstractBuild.java:510) at hudson.model.Run.execute(Run.java:1815) at hudson.model.FreeStyleBuild.run(FreeStyleBuild.java:43) at hudson.model.ResourceController.execute(ResourceController.java:97) at hudson.model.Executor.run(Executor.java:429) java.lang.NoClassDefFoundError: Could not initialize class hudson.util.ProcessTree$UnixReflection at hudson.util.ProcessTree$UnixProcess.kill(ProcessTree.java:726) at hudson.util.ProcessTree$UnixProcess.killRecursively(ProcessTree.java:747) at hudson.util.ProcessTree$Unix.killAll(ProcessTree.java:666) at hudson.Launcher$RemoteLauncher$KillTask.call(Launcher.java:1090) at hudson.Launcher$RemoteLauncher$KillTask.call(Launcher.java:1081) at hudson.remoting.UserRequest.perform(UserRequest.java:210) at hudson.remoting.UserRequest.perform(UserRequest.java:53) at hudson.remoting.Request$2.run(Request.java:364) at hudson.remoting.InterceptingExecutorService$1.call(InterceptingExecutorService.java:72) at java.util.concurrent.FutureTask.run(FutureTask.java:264) at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1167) at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:641) at hudson.remoting.Engine$1$1.run(Engine.java:94) at java.lang.Thread.run(Thread.java:844) Caused: java.io.IOException: Remote call on JNLP4-connect connection from 172.16.232.82/172.16.232.82:50962 failed at hudson.remoting.Channel.call(Channel.java:961) at hudson.Launcher$RemoteLauncher.kill(Launcher.java:1078) at hudson.model.AbstractBuild$AbstractBuildExecution.run(AbstractBuild.java:510) at hudson.model.Run.execute(Run.java:1815) at hudson.model.FreeStyleBuild.run(FreeStyleBuild.java:43) at hudson.model.ResourceController.execute(ResourceController.java:97) at hudson.model.Executor.run(Executor.java:429) Finished: FAILURE