Build failed in Jenkins: xmlgraphics-fop #94

[Apache Jenkins Server]

See <https://builds.apache.org/job/xmlgraphics-fop/94/display/redirect>

------------------------------------------
Started by user ssteiner
[EnvInject] - Loading node environment variables.
Building remotely on H14 (ubuntu) in workspace 
<https://builds.apache.org/job/xmlgraphics-fop/ws/>
Updating https://svn.apache.org/repos/asf/xmlgraphics/fop/trunk at revision 
'2017-02-28T12:10:08.098 +0000'
At revision 1784731

No changes for https://svn.apache.org/repos/asf/xmlgraphics/fop/trunk since the 
previous build
Parsing POMs
Established TCP socket on 34192
Copied maven-agent.jar
classworlds.jar already up to date
Copied maven-interceptor.jar
maven2.1-interceptor.jar already up to date
[xmlgraphics-fop] $ 
/home/jenkins/tools/java/jdk1.6.0_20-32-unlimited-security/bin/java -Xmx2g 
-Xms256m -cp 
/home/jenkins/jenkins-slave/maven-agent.jar:/home/jenkins/jenkins-slave/classworlds.jar
 hudson.maven.agent.Main /home/jenkins/tools/maven/apache-maven-2.2.1 
/home/jenkins/jenkins-slave/slave.jar 
/home/jenkins/jenkins-slave/maven-interceptor.jar 34192 
/home/jenkins/jenkins-slave/maven2.1-interceptor.jar
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:632)
        at java.lang.ClassLoader.defineClass(ClassLoader.java:616)
        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$1.run(URLClassLoader.java:197)
        at java.security.AccessController.doPrivileged(Native Method)
        at java.net.URLClassLoader.findClass(URLClassLoader.java:190)
        at java.lang.ClassLoader.loadClass(ClassLoader.java:307)
        at 
org.codehaus.classworlds.RealmClassLoader.loadClassDirect(RealmClassLoader.java:195)
        at 
org.codehaus.classworlds.DefaultClassRealm.loadClass(DefaultClassRealm.java:255)
        at hudson.maven.agent.Main.main(Main.java:143)
        at hudson.maven.agent.Main.main(Main.java:68)
ERROR: Failed to parse POMs
java.io.EOFException: unexpected stream termination
        at hudson.remoting.ChannelBuilder.negotiate(ChannelBuilder.java:365)
        at hudson.remoting.ChannelBuilder.build(ChannelBuilder.java:310)
        at hudson.slaves.Channels.forProcess(Channels.java:115)
        at 
hudson.maven.AbstractMavenProcessFactory.newProcess(AbstractMavenProcessFactory.java:294)
        at hudson.maven.ProcessCache.get(ProcessCache.java:236)
        at 
hudson.maven.MavenModuleSetBuild$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)