Build failed in Jenkins: commons-pool #15

[Apache Jenkins Server]

See <https://builds.apache.org/job/commons-pool/15/display/redirect>

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Started by an SCM change
[EnvInject] - Loading node environment variables.
Building remotely on ubuntu-4 (ubuntu) in workspace 
<https://builds.apache.org/job/commons-pool/ws/>
Updating https://svn.apache.org/repos/asf/commons/proper/pool/trunk at revision 
'2017-03-05T17:25:55.729 +0000'
At revision 1785555

No changes for https://svn.apache.org/repos/asf/commons/proper/pool/trunk since 
the previous build
Parsing POMs
Established TCP socket on 42129
maven3-agent.jar already up to date
maven3-interceptor.jar already up to date
maven3-interceptor-commons.jar already up to date
[commons-pool] $ /home/jenkins/tools/java/latest1.6/bin/java -Xmx2g -Xms256m 
-cp 
/home/jenkins/jenkins-slave/maven3-agent.jar:/home/jenkins/tools/maven/apache-maven-3.0.5/boot/plexus-classworlds-2.4.jar
 org.jvnet.hudson.maven3.agent.Maven3Main 
/home/jenkins/tools/maven/apache-maven-3.0.5 
/home/jenkins/jenkins-slave/slave.jar 
/home/jenkins/jenkins-slave/maven3-interceptor.jar 
/home/jenkins/jenkins-slave/maven3-interceptor-commons.jar 42129
Exception in thread "main" java.lang.UnsupportedClassVersionError: 
hudson/remoting/Launcher : Unsupported major.minor version 51.0
        at java.lang.ClassLoader.defineClass1(Native Method)
        at java.lang.ClassLoader.defineClassCond(ClassLoader.java:631)
        at java.lang.ClassLoader.defineClass(ClassLoader.java:615)
        at 
java.security.SecureClassLoader.defineClass(SecureClassLoader.java:141)
        at java.net.URLClassLoader.defineClass(URLClassLoader.java:283)
        at java.net.URLClassLoader.access$000(URLClassLoader.java:58)
        at java.net.URLClassLoader$1.run(URLClassLoader.java:197)
        at java.security.AccessController.doPrivileged(Native Method)
        at java.net.URLClassLoader.findClass(URLClassLoader.java:190)
        at 
org.codehaus.plexus.classworlds.realm.ClassRealm.loadClassFromSelf(ClassRealm.java:386)
        at 
org.codehaus.plexus.classworlds.strategy.SelfFirstStrategy.loadClass(SelfFirstStrategy.java:42)
        at 
org.codehaus.plexus.classworlds.realm.ClassRealm.loadClass(ClassRealm.java:244)
        at 
org.codehaus.plexus.classworlds.realm.ClassRealm.loadClass(ClassRealm.java:230)
        at org.jvnet.hudson.maven3.agent.Maven3Main.main(Maven3Main.java:138)
        at org.jvnet.hudson.maven3.agent.Maven3Main.main(Maven3Main.java:70)
ERROR: Failed to parse POMs
java.io.EOFException: unexpected stream termination
        at hudson.remoting.ChannelBuilder.negotiate(ChannelBuilder.java:365)
        at hudson.remoting.ChannelBuilder.build(ChannelBuilder.java:310)
        at hudson.slaves.Channels.forProcess(Channels.java:115)
        at 
hudson.maven.AbstractMavenProcessFactory.newProcess(AbstractMavenProcessFactory.java:294)
        at hudson.maven.ProcessCache.get(ProcessCache.java:236)
        at 
hudson.maven.MavenModuleSetBuild$MavenModuleSetBuildExecution.doRun(MavenModuleSetBuild.java:798)
        at 
hudson.model.AbstractBuild$AbstractBuildExecution.run(AbstractBuild.java:534)
        at hudson.model.Run.execute(Run.java:1728)
        at hudson.maven.MavenModuleSetBuild.run(MavenModuleSetBuild.java:544)
        at hudson.model.ResourceController.execute(ResourceController.java:98)
        at hudson.model.Executor.run(Executor.java:404)

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