When I try to start a slave agent on my Ubuntu 12.04 machine (the master is running 14.04), I get the following error:
[10/06/15 16:26:42] [SSH] Starting slave process: cd "/home/build/jenkins-workspace" && java -jar slave.jar <===[JENKINS REMOTING CAPACITY]===>channel started hudson.util.IOException2: Slave JVM has not reported exit code. Is it still running? at hudson.plugins.sshslaves.SSHLauncher.startSlave(SSHLauncher.java:984) at hudson.plugins.sshslaves.SSHLauncher.access$400(SSHLauncher.java:137) at hudson.plugins.sshslaves.SSHLauncher$2.call(SSHLauncher.java:725) at hudson.plugins.sshslaves.SSHLauncher$2.call(SSHLauncher.java:706) at java.util.concurrent.FutureTask.run(FutureTask.java:262) at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145) at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615) at java.lang.Thread.run(Thread.java:745) Caused by: java.io.IOException: Remote call on Ubuntu1204-amd64-1 failed at hudson.remoting.Channel.call(Channel.java:786) at hudson.slaves.SlaveComputer.setChannel(SlaveComputer.java:493) at hudson.slaves.SlaveComputer.setChannel(SlaveComputer.java:366) at hudson.plugins.sshslaves.SSHLauncher.startSlave(SSHLauncher.java:976) ... 7 more Caused by: java.lang.ClassFormatError: Failed to load hudson.slaves.SlaveComputer$SlaveVersion at hudson.remoting.RemoteClassLoader.loadClassFile(RemoteClassLoader.java:340) at hudson.remoting.RemoteClassLoader.findClass(RemoteClassLoader.java:251) at java.lang.ClassLoader.loadClass(ClassLoader.java:323) at java.lang.ClassLoader.loadClass(ClassLoader.java:268) at java.lang.Class.forName0(Native Method) at java.lang.Class.forName(Class.java:274) at hudson.remoting.MultiClassLoaderSerializer$Input.resolveClass(MultiClassLoaderSerializer.java:113) at java.io.ObjectInputStream.readNonProxyDesc(ObjectInputStream.java:1611) at java.io.ObjectInputStream.readClassDesc(ObjectInputStream.java:1516) at java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:1770) at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1349) at java.io.ObjectInputStream.readObject(ObjectInputStream.java:369) at hudson.remoting.UserRequest.deserialize(UserRequest.java:185) at hudson.remoting.UserRequest.perform(UserRequest.java:99) at hudson.remoting.UserRequest.perform(UserRequest.java:49) at hudson.remoting.Request$2.run(Request.java:326) at hudson.remoting.InterceptingExecutorService$1.call(InterceptingExecutorService.java:68) at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:334) at java.util.concurrent.FutureTask.run(FutureTask.java:166) at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1146) at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615) at java.lang.Thread.run(Thread.java:701) at ......remote call to Ubuntu1204-amd64-1(Native Method) at hudson.remoting.Channel.attachCallSiteStackTrace(Channel.java:1413) at hudson.remoting.UserResponse.retrieve(UserRequest.java:221) at hudson.remoting.Channel.call(Channel.java:778) ... 10 more Caused by: java.lang.UnsupportedClassVersionError: hudson/slaves/SlaveComputer$SlaveVersion : Unsupported major.minor version 51.0 at java.lang.ClassLoader.defineClass1(Native Method) at java.lang.ClassLoader.defineClass(ClassLoader.java:643) at java.lang.ClassLoader.defineClass(ClassLoader.java:489) at hudson.remoting.RemoteClassLoader.loadClassFile(RemoteClassLoader.java:338) at hudson.remoting.RemoteClassLoader.findClass(RemoteClassLoader.java:251) at java.lang.ClassLoader.loadClass(ClassLoader.java:323) at java.lang.ClassLoader.loadClass(ClassLoader.java:268) at java.lang.Class.forName0(Native Method) at java.lang.Class.forName(Class.java:274) at hudson.remoting.MultiClassLoaderSerializer$Input.resolveClass(MultiClassLoaderSerializer.java:113) at java.io.ObjectInputStream.readNonProxyDesc(ObjectInputStream.java:1611) at java.io.ObjectInputStream.readClassDesc(ObjectInputStream.java:1516) at java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:1770) at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1349) at java.io.ObjectInputStream.readObject(ObjectInputStream.java:369) at hudson.remoting.UserRequest.deserialize(UserRequest.java:185) at hudson.remoting.UserRequest.perform(UserRequest.java:99) at hudson.remoting.UserRequest.perform(UserRequest.java:49) at hudson.remoting.Request$2.run(Request.java:326) at hudson.remoting.InterceptingExecutorService$1.call(InterceptingExecutorService.java:68) at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:334) at java.util.concurrent.FutureTask.run(FutureTask.java:166) at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1146) at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615) at java.lang.Thread.run(Thread.java:701) [10/06/15 16:26:47] Launch failed - cleaning up connection ERROR: Connection terminated java.io.IOException: Unexpected termination of the channel at hudson.remoting.SynchronousCommandTransport$ReaderThread.run(SynchronousCommandTransport.java:50) [10/06/15 16:26:47] [SSH] Connection closed. Caused by: java.io.EOFException at java.io.ObjectInputStream$PeekInputStream.readFully(ObjectInputStream.java:2332) at java.io.ObjectInputStream$BlockDataInputStream.readShort(ObjectInputStream.java:2801) at java.io.ObjectInputStream.readStreamHeader(ObjectInputStream.java:801) at java.io.ObjectInputStream.<init>(ObjectInputStream.java:299) at hudson.remoting.ObjectInputStreamEx.<init>(ObjectInputStreamEx.java:40) at hudson.remoting.AbstractSynchronousByteArrayCommandTransport.read(AbstractSynchronousByteArrayCommandTransport.java:34) at hudson.remoting.SynchronousCommandTransport$ReaderThread.run(SynchronousCommandTransport.java:48) .. Any idea what might cause this problem? -- You received this message because you are subscribed to the Google Groups "Jenkins Users" group. To unsubscribe from this group and stop receiving emails from it, send an email to jenkinsci-users+unsubscr...@googlegroups.com. 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