Build failed in Jenkins: DeltaSpike_TomEE_1.7.x #240

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See <https://builds.apache.org/job/DeltaSpike_TomEE_1.7.x/240/display/redirect?page=changes>

Changes:

[struberg] update docs to release 1.9.4


------------------------------------------
Started by upstream project "DeltaSpike for Java EE" build number 331
originally caused by:
 Started by an SCM change
Running as SYSTEM
[EnvInject] - Loading node environment variables.
Building remotely on H27 (ubuntu) in workspace <https://builds.apache.org/job/DeltaSpike_TomEE_1.7.x/ws/>
No credentials specified
 > git rev-parse --is-inside-work-tree # timeout=10
Fetching changes from the remote Git repository
 > git config remote.origin.url https://git-wip-us.apache.org/repos/asf/deltaspike.git # timeout=10
Fetching upstream changes from https://git-wip-us.apache.org/repos/asf/deltaspike.git
 > git --version # timeout=10
 > git fetch --tags --progress -- https://git-wip-us.apache.org/repos/asf/deltaspike.git +refs/heads/*:refs/remotes/origin/*
 > git rev-parse origin/master^{commit} # timeout=10
Checking out Revision e25f16c70c7377b31e51059f6cb9bd21ebf9eabf (origin/master)
 > git config core.sparsecheckout # timeout=10
 > git checkout -f e25f16c70c7377b31e51059f6cb9bd21ebf9eabf
Commit message: "update docs to release 1.9.4"
 > git rev-list --no-walk 370c0136ec5f597aee0c49b443a200ef0e3590e3 # timeout=10
Parsing POMs
Modules changed, recalculating dependency graph
Established TCP socket on 45175
maven35-agent.jar already up to date
maven35-interceptor.jar already up to date
maven3-interceptor-commons.jar already up to date
[DeltaSpike_TomEE_1.7.x] $ /home/jenkins/tools/java/latest1.7/bin/java -Xmx4g -Xms4g -cp /home/jenkins/jenkins-slave/maven35-agent.jar:/home/jenkins/tools/maven/latest3/boot/plexus-classworlds-2.6.0.jar:/home/jenkins/tools/maven/latest3/conf/logging jenkins.maven3.agent.Maven35Main /home/jenkins/tools/maven/latest3/ /home/jenkins/jenkins-slave/remoting.jar /home/jenkins/jenkins-slave/maven35-interceptor.jar /home/jenkins/jenkins-slave/maven3-interceptor-commons.jar 45175
Exception in thread "main" java.lang.UnsupportedClassVersionError: jenkins/maven3/agent/Maven35Main : 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$1.run(URLClassLoader.java:355)
	at java.security.AccessController.doPrivileged(Native Method)
	at java.net.URLClassLoader.findClass(URLClassLoader.java:354)
	at java.lang.ClassLoader.loadClass(ClassLoader.java:425)
	at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:308)
	at java.lang.ClassLoader.loadClass(ClassLoader.java:358)
	at sun.launcher.LauncherHelper.checkAndLoadMain(LauncherHelper.java:482)
ERROR: Failed to launch Maven. Exit code = 1