Build failed in Jenkins: portals-pluto-trunk #78

See <https://builds.apache.org/job/portals-pluto-trunk/78/display/redirect?page=changes>

Changes:

[neil.griffin.scm] PLUTO-673 TCK: Contesting

[neil.griffin.scm] PLUTO-674 TCK: Contesting

------------------------------------------
Started by an SCM change
[EnvInject] - Loading node environment variables.
Building remotely on H31 (ubuntu xenial) in workspace <https://builds.apache.org/job/portals-pluto-trunk/ws/>
Cloning the remote Git repository
Cloning repository https://github.com/apache/portals-pluto
 > git init <https://builds.apache.org/job/portals-pluto-trunk/ws/> # timeout=10
Fetching upstream changes from https://github.com/apache/portals-pluto
 > git --version # timeout=10
using GIT_SSH to set credentials 
 > git fetch --tags --progress https://github.com/apache/portals-pluto +refs/heads/*:refs/remotes/origin/*
 > git config remote.origin.url https://github.com/apache/portals-pluto # timeout=10
 > git config --add remote.origin.fetch +refs/heads/*:refs/remotes/origin/* # timeout=10
 > git config remote.origin.url https://github.com/apache/portals-pluto # timeout=10
Fetching upstream changes from https://github.com/apache/portals-pluto
using GIT_SSH to set credentials 
 > git fetch --tags --progress https://github.com/apache/portals-pluto +refs/heads/*:refs/remotes/origin/*
 > git rev-parse refs/remotes/origin/master^{commit} # timeout=10
 > git rev-parse refs/remotes/origin/origin/master^{commit} # timeout=10
Checking out Revision dd526d5d8205ba01e9b2121ef5ce1700d94b82ae (refs/remotes/origin/master)
 > git config core.sparsecheckout # timeout=10
 > git checkout -f dd526d5d8205ba01e9b2121ef5ce1700d94b82ae
Commit message: "PLUTO-674 TCK: Contesting V2EnvironmentTests_PortletContext_ApiRender_getServerInfo1"
 > git rev-list dbdc55ad2a6cf56c0d6539808f0c47dffbbc2f20 # timeout=10
[locks-and-latches] Checking to see if we really have the locks
[locks-and-latches] Have all the locks, build can start
Parsing POMs
Downloaded artifact http://repo.maven.apache.org/maven2/org/apache/portals/portals-pom/1.4/portals-pom-1.4.pom
Modules changed, recalculating dependency graph
Established TCP socket on 43717
maven32-agent.jar already up to date
maven32-interceptor.jar already up to date
maven3-interceptor-commons.jar already up to date
[portals-pluto-trunk] $ /home/jenkins/tools/java/latest1.7/bin/java -Xmx2g -Xms256m -cp /home/jenkins/jenkins-slave/maven32-agent.jar:/home/jenkins/tools/maven/apache-maven-3.2.1/boot/plexus-classworlds-2.5.1.jar:/home/jenkins/tools/maven/apache-maven-3.2.1/conf/logging jenkins.maven3.agent.Maven32Main /home/jenkins/tools/maven/apache-maven-3.2.1 /home/jenkins/jenkins-slave/slave.jar /home/jenkins/jenkins-slave/maven32-interceptor.jar /home/jenkins/jenkins-slave/maven3-interceptor-commons.jar 43717
Exception in thread "main" java.lang.UnsupportedClassVersionError: hudson/remoting/Launcher : Unsupported major.minor version 52.0
	at java.lang.ClassLoader.defineClass1(Native Method)
	at java.lang.ClassLoader.defineClass(ClassLoader.java:800)
	at java.security.SecureClassLoader.defineClass(SecureClassLoader.java:142)
	at java.net.URLClassLoader.defineClass(URLClassLoader.java:449)
	at java.net.URLClassLoader.access$100(URLClassLoader.java:71)
	at java.net.URLClassLoader$1.run(URLClassLoader.java:361)
	at java.net.URLClassLoader$1.run(URLClassLoader.java:355)
	at java.security.AccessController.doPrivileged(Native Method)
	at java.net.URLClassLoader.findClass(URLClassLoader.java:354)
	at org.codehaus.plexus.classworlds.realm.ClassRealm.loadClassFromSelf(ClassRealm.java:389)
	at org.codehaus.plexus.classworlds.strategy.SelfFirstStrategy.loadClass(SelfFirstStrategy.java:42)
	at org.codehaus.plexus.classworlds.realm.ClassRealm.unsynchronizedLoadClass(ClassRealm.java:259)
	at org.codehaus.plexus.classworlds.realm.ClassRealm.loadClass(ClassRealm.java:235)
	at org.codehaus.plexus.classworlds.realm.ClassRealm.loadClass(ClassRealm.java:227)
	at jenkins.maven3.agent.Maven32Main.main(Maven32Main.java:143)
	at jenkins.maven3.agent.Maven32Main.main(Maven32Main.java:74)
[locks-and-latches] Releasing all the locks
[locks-and-latches] All the locks released
ERROR: Failed to parse POMs
java.io.EOFException: unexpected stream termination
	at hudson.remoting.ChannelBuilder.negotiate(ChannelBuilder.java:408)
	at hudson.remoting.ChannelBuilder.build(ChannelBuilder.java:353)
	at hudson.slaves.Channels.forProcess(Channels.java:115)
	at hudson.maven.AbstractMavenProcessFactory.newProcess(AbstractMavenProcessFactory.java:294)
	at hudson.maven.ProcessCache.get(ProcessCache.java:236)
	at hudson.maven.MavenModuleSetBuild$MavenModuleSetBuildExecution.doRun(MavenModuleSetBuild.java:804)
	at hudson.model.AbstractBuild$AbstractBuildExecution.run(AbstractBuild.java:504)
	at hudson.model.Run.execute(Run.java:1724)
	at hudson.maven.MavenModuleSetBuild.run(MavenModuleSetBuild.java:543)
	at hudson.model.ResourceController.execute(ResourceController.java:97)
	at hudson.model.Executor.run(Executor.java:421)