This issue also arise in (several?) plugins that are using the ProcessTree code to shut down processes, for example Xvfb plugin.
Is there a planned date for Jenkins being able to run on Java8 (both slaves and master)?
Release 1.557 seems to contain the fix for XStream with Java8, but this issue isn't planned for any release from what I can see?

java.io.IOException: Remote call on jenkins-slave2 failed
    at hudson.remoting.Channel.call(Channel.java:731)
    at hudson.remoting.RemoteInvocationHandler.invoke(RemoteInvocationHandler.java:167)
    at $Proxy49.kill(Unknown Source)
    at hudson.Launcher$RemoteLauncher$ProcImpl.kill(Launcher.java:920)
    at org.jenkinsci.plugins.xvfb.XvfbBuildWrapper.shutdownAndCleanup(XvfbBuildWrapper.java:201)
    at org.jenkinsci.plugins.xvfb.XvfbBuildWrapper.access$000(XvfbBuildWrapper.java:73)
    at org.jenkinsci.plugins.xvfb.XvfbBuildWrapper$5.tearDown(XvfbBuildWrapper.java:503)
    at hudson.maven.MavenModuleSetBuild$MavenModuleSetBuildExecution.doRun(MavenModuleSetBuild.java:862)
    at hudson.model.AbstractBuild$AbstractBuildExecution.run(AbstractBuild.java:585)
    at hudson.model.Run.execute(Run.java:1676)
    at hudson.maven.MavenModuleSetBuild.run(MavenModuleSetBuild.java:519)
    at hudson.model.ResourceController.execute(ResourceController.java:88)
    at hudson.model.Executor.run(Executor.java:231)
Caused by: java.lang.NoClassDefFoundError: Could not initialize class hudson.util.ProcessTree$UnixReflection
    at hudson.util.ProcessTree$Unix.get(ProcessTree.java:485)
    at hudson.util.ProcessTree.killAll(ProcessTree.java:147)
    at hudson.Proc$LocalProc.destroy(Proc.java:379)
    at hudson.Proc$LocalProc.kill(Proc.java:371)
    at hudson.Launcher$RemoteLaunchCallable$1.kill(Launcher.java:1015)
    at sun.reflect.GeneratedMethodAccessor79.invoke(Unknown Source)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.lang.reflect.Method.invoke(Method.java:483)
    at hudson.remoting.RemoteInvocationHandler$RPCRequest.perform(RemoteInvocationHandler.java:299)
    at hudson.remoting.RemoteInvocationHandler$RPCRequest.call(RemoteInvocationHandler.java:280)
    at hudson.remoting.RemoteInvocationHandler$RPCRequest.call(RemoteInvocationHandler.java:239)
    at hudson.remoting.UserRequest.perform(UserRequest.java:118)
    at hudson.remoting.UserRequest.perform(UserRequest.java:48)
    at hudson.remoting.Request$2.run(Request.java:328)
    at hudson.remoting.InterceptingExecutorService$1.call(InterceptingExecutorService.java:72)
    at java.util.concurrent.FutureTask.run(FutureTask.java:266)
    at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
    at hudson.remoting.Engine$1$1.run(Engine.java:63)
    at java.lang.Thread.run(Thread.java:744)
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