It seems we have to have different jenkins master and slaves for JDK6; 
Or drop the support of JDK6; Or downgrade jenkins master to JDK6.

On 6/23/2017 2:05 PM, Yasser Zamani wrote:
> I found the documentation at [1].
>
> Further info at [2] and [3] are available.
>
> [1] https://github.com/jenkins-infra/jenkins.io/pull/554/files
> [2] https://issues.jenkins-ci.org/browse/JENKINS-40810
> [3] https://issues.apache.org/jira/browse/INFRA-13556
>
> On 6/23/2017 1:49 PM, Yasser Zamani wrote:
>> Class "hudson.remoting.Launcher" has been compiled with jdk7 so you get
>> this message when you use jdk6. (I had same problem with maven then I
>> replaced last maven which is compatible with jdk6)
>>
>> On 6/23/2017 11:57 AM, Apache Jenkins Server wrote:
>>> See 
>>> <https://builds.apache.org/job/Struts-JDK6-support-2.3/1063/display/redirect?page=changes>
>>>
>>> Changes:
>>>
>>> [Lukasz Lenart] Uses resource message key instead of passing message 
>>> directly
>>>
>>> ------------------------------------------
>>> Started by user Lukasz Lenart
>>> [EnvInject] - Loading node environment variables.
>>> Building remotely on ubuntu-eu2 (ubuntu trusty) in workspace 
>>> <https://builds.apache.org/job/Struts-JDK6-support-2.3/ws/>
>>> Cloning the remote Git repository
>>> Cloning repository http://git.apache.org/struts.git
>>>  > git init <https://builds.apache.org/job/Struts-JDK6-support-2.3/ws/> # 
>>> timeout=10
>>> Fetching upstream changes from http://git.apache.org/struts.git
>>>  > git --version # timeout=10
>>>  > git fetch --tags --progress http://git.apache.org/struts.git 
>>> +refs/heads/*:refs/remotes/origin/*
>>>  > git config remote.origin.url http://git.apache.org/struts.git # 
>>> timeout=10
>>>  > git config --add remote.origin.fetch +refs/heads/*:refs/remotes/origin/* 
>>> # timeout=10
>>>  > git config remote.origin.url http://git.apache.org/struts.git # 
>>> timeout=10
>>> Fetching upstream changes from http://git.apache.org/struts.git
>>>  > git fetch --tags --progress http://git.apache.org/struts.git 
>>> +refs/heads/*:refs/remotes/origin/*
>>>  > git rev-parse refs/remotes/origin/support-2-3^{commit} # timeout=10
>>>  > git rev-parse refs/remotes/origin/refs/heads/support-2-3^{commit} # 
>>> timeout=10
>>> Checking out Revision 73da12e723c2737bd515946588ddcd898acf584a 
>>> (refs/remotes/origin/support-2-3)
>>>  > git config core.sparsecheckout # timeout=10
>>>  > git checkout -f 73da12e723c2737bd515946588ddcd898acf584a
>>>  > git rev-list 9e8627ca669ec566bbedd638fc6010e8ae364160 # 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
>>> Modules changed, recalculating dependency graph
>>> Established TCP socket on 54465
>>> maven3-agent.jar already up to date
>>> maven3-interceptor.jar already up to date
>>> maven3-interceptor-commons.jar already up to date
>>> [Struts-JDK6-support-2.3] $ /home/jenkins/tools/java/latest1.6/bin/java 
>>> -Xms128m -Xmx768m -XX:MaxPermSize=256m -XX:PermSize=128m -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 54465
>>> 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$1.run(URLClassLoader.java:197)
>>>     at java.security.AccessController.doPrivileged(Native Method)
>>>     at java.net.URLClassLoader.findClass(URLClassLoader.java:190)
>>>     at 
>>> org.codehaus.plexus.classworlds.realm.ClassRealm.loadClassFromSelf(ClassRealm.java:386)
>>>     at 
>>> org.codehaus.plexus.classworlds.strategy.SelfFirstStrategy.loadClass(SelfFirstStrategy.java:42)
>>>     at 
>>> org.codehaus.plexus.classworlds.realm.ClassRealm.loadClass(ClassRealm.java:244)
>>>     at 
>>> org.codehaus.plexus.classworlds.realm.ClassRealm.loadClass(ClassRealm.java:230)
>>>     at org.jvnet.hudson.maven3.agent.Maven3Main.main(Maven3Main.java:138)
>>>     at org.jvnet.hudson.maven3.agent.Maven3Main.main(Maven3Main.java:70)
>>> [locks-and-latches] Releasing all the locks
>>> [locks-and-latches] All the locks released
>>> ERROR: Failed to parse POMs
>>> java.io.EOFException: unexpected stream termination
>>>     at hudson.remoting.ChannelBuilder.negotiate(ChannelBuilder.java:365)
>>>     at hudson.remoting.ChannelBuilder.build(ChannelBuilder.java:310)
>>>     at hudson.slaves.Channels.forProcess(Channels.java:115)
>>>     at 
>>> hudson.maven.AbstractMavenProcessFactory.newProcess(AbstractMavenProcessFactory.java:294)
>>>     at hudson.maven.ProcessCache.get(ProcessCache.java:236)
>>>     at 
>>> hudson.maven.MavenModuleSetBuild$MavenModuleSetBuildExecution.doRun(MavenModuleSetBuild.java:803)
>>>     at 
>>> hudson.model.AbstractBuild$AbstractBuildExecution.run(AbstractBuild.java:534)
>>>     at hudson.model.Run.execute(Run.java:1728)
>>>     at hudson.maven.MavenModuleSetBuild.run(MavenModuleSetBuild.java:542)
>>>     at hudson.model.ResourceController.execute(ResourceController.java:98)
>>>     at hudson.model.Executor.run(Executor.java:405)
>>>
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