The remote machine is probably configured to run a java version which is too old. For example, you may have Java 6 installed on the Ubuntu 12.04 machine when you need to install Java 7.
If Java 7 is installed on the Ubuntu 12 machine, then you may need to configure the Jenkins slave to run with that java instead of the default Java on the Ubuntu 12 machine. Mark Waite On Tue, Oct 6, 2015 at 2:31 PM Zach La Celle <[email protected]> wrote: > 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 [email protected]. > To view this discussion on the web visit > https://groups.google.com/d/msgid/jenkinsci-users/e5fb00c7-6aed-4236-88c9-e547543e2794%40googlegroups.com > <https://groups.google.com/d/msgid/jenkinsci-users/e5fb00c7-6aed-4236-88c9-e547543e2794%40googlegroups.com?utm_medium=email&utm_source=footer> > . > For more options, visit https://groups.google.com/d/optout. > -- You received this message because you are subscribed to the Google Groups "Jenkins Users" group. 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