Build failed in Jenkins: Mahout-Quality #812

[Apache Jenkins Server]

See <https://builds.apache.org/hudson/job/Mahout-Quality/812/>

------------------------------------------
Started by timer
Building remotely on ubuntu2
hudson.util.IOException2: remote file operation failed: 
<https://builds.apache.org/hudson/job/Mahout-Quality/ws/> at 
hudson.remoting.Channel@376085ff:ubuntu2
        at hudson.FilePath.act(FilePath.java:752)
        at hudson.FilePath.act(FilePath.java:738)
        at hudson.scm.SubversionSCM.checkout(SubversionSCM.java:684)
        at hudson.scm.SubversionSCM.checkout(SubversionSCM.java:633)
        at hudson.model.AbstractProject.checkout(AbstractProject.java:1181)
        at 
hudson.model.AbstractBuild$AbstractRunner.checkout(AbstractBuild.java:536)
        at hudson.model.AbstractBuild$AbstractRunner.run(AbstractBuild.java:424)
        at hudson.model.Run.run(Run.java:1374)
        at hudson.model.FreeStyleBuild.run(FreeStyleBuild.java:46)
        at hudson.model.ResourceController.execute(ResourceController.java:88)
        at hudson.model.Executor.run(Executor.java:145)
Caused by: java.io.IOException: Remote call on ubuntu2 failed
        at hudson.remoting.Channel.call(Channel.java:652)
        at hudson.FilePath.act(FilePath.java:745)
        ... 10 more
Caused by: java.lang.LinkageError: loader (instance of  
hudson/remoting/RemoteClassLoader): attempted  duplicate class definition for 
name: "hudson/model/Descriptor"
        at java.lang.ClassLoader.defineClass1(Native Method)
        at java.lang.ClassLoader.defineClass(ClassLoader.java:634)
        at java.lang.ClassLoader.defineClass(ClassLoader.java:480)
        at 
hudson.remoting.RemoteClassLoader.loadClassFile(RemoteClassLoader.java:151)
        at 
hudson.remoting.RemoteClassLoader.findClass(RemoteClassLoader.java:131)
        at java.lang.ClassLoader.loadClass(ClassLoader.java:321)
        at java.lang.ClassLoader.loadClass(ClassLoader.java:266)
        at java.lang.Class.getDeclaredFields0(Native Method)
        at java.lang.Class.privateGetDeclaredFields(Class.java:2308)
        at java.lang.Class.getDeclaredField(Class.java:1897)
        at 
java.io.ObjectStreamClass.getDeclaredSUID(ObjectStreamClass.java:1627)
        at java.io.ObjectStreamClass.access$700(ObjectStreamClass.java:69)
        at java.io.ObjectStreamClass$2.run(ObjectStreamClass.java:442)
        at java.security.AccessController.doPrivileged(Native Method)
        at java.io.ObjectStreamClass.<init>(ObjectStreamClass.java:430)
        at java.io.ObjectStreamClass.lookup(ObjectStreamClass.java:327)
        at java.io.ObjectStreamClass.initNonProxy(ObjectStreamClass.java:564)
        at 
java.io.ObjectInputStream.readNonProxyDesc(ObjectInputStream.java:1600)
        at java.io.ObjectInputStream.readClassDesc(ObjectInputStream.java:1513)
        at 
java.io.ObjectInputStream.readNonProxyDesc(ObjectInputStream.java:1600)
        at java.io.ObjectInputStream.readClassDesc(ObjectInputStream.java:1513)
        at 
java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:1749)
        at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1346)
        at 
java.io.ObjectInputStream.defaultReadFields(ObjectInputStream.java:1963)
        at java.io.ObjectInputStream.readSerialData(ObjectInputStream.java:1887)
        at 
java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:1770)
        at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1346)
        at 
java.io.ObjectInputStream.defaultReadFields(ObjectInputStream.java:1963)
        at java.io.ObjectInputStream.readSerialData(ObjectInputStream.java:1887)
        at 
java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:1770)
        at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1346)
        at 
java.io.ObjectInputStream.defaultReadFields(ObjectInputStream.java:1963)
        at java.io.ObjectInputStream.readSerialData(ObjectInputStream.java:1887)
        at 
java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:1770)
        at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1346)
        at java.io.ObjectInputStream.readObject(ObjectInputStream.java:368)
        at hudson.remoting.UserRequest.deserialize(UserRequest.java:182)
        at hudson.remoting.UserRequest.perform(UserRequest.java:98)
        at hudson.remoting.UserRequest.perform(UserRequest.java:48)
        at hudson.remoting.Request$2.run(Request.java:270)
        at 
java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:471)
        at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:334)
        at java.util.concurrent.FutureTask.run(FutureTask.java:166)
        at 
java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1110)
        at 
java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:603)
        at java.lang.Thread.run(Thread.java:636)
[FINDBUGS] Skipping publisher since build result is FAILURE
[PMD] Skipping publisher since build result is FAILURE
[TASKS] Skipping publisher since build result is FAILURE
Archiving artifacts
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