When I ran Java update on a slave, it requested that javaw is stopped.
when approving that then: ALL the slaves were terminated.
I am adding the error in the server log for one of the slaves.

The slaves pages also display a "failed to abort" error (pic attached) and cannot be restarted using javaw, before the whole Jenkins server (the service, not the machine) is restarted.

slaves are VM's that are hosted on VMWARE server
I also noticed that when a VM is restarted, this terminates all others (by Jenkins server)

version: 1.560

------------------------
I care about getting this fixed, so I'm offering USD 50.00 via FreedomSponsors to the first person who fix it.

Offer link: http://www.freedomsponsors.org/core/issue/489/all-slaves-are-terminated-when-javaw-is-stopped-on-one-slave

You can also join me and throw in a few bucks there and we'll get it fixed faster

If you fix this issue (see my acceptance criteria there) please use that site to request your payment.
----------------------------------------------------------------

Server Log
--------------
WARNING: NioChannelHub keys=17 gen=201082: Computer.threadPoolForRemoting 2 for + HV1-VM-SLAVE-22 terminated
java.io.IOException: Failed to abort
at org.jenkinsci.remoting.nio.NioChannelHub$NioTransport.abort(NioChannelHub.java:184)
at org.jenkinsci.remoting.nio.NioChannelHub.abortAll(NioChannelHub.java:599)
at org.jenkinsci.remoting.nio.NioChannelHub.run(NioChannelHub.java:481)
at jenkins.util.ContextResettingExecutorService$1.run(ContextResettingExecutorService.java:28)
at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:439)
at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:303)
at java.util.concurrent.FutureTask.run(FutureTask.java:138)
at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:895)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:918)
at java.lang.Thread.run(Thread.java:662)
Caused by: java.nio.channels.ClosedChannelException
at sun.nio.ch.SocketChannelImpl.shutdownInput(SocketChannelImpl.java:663)
at sun.nio.ch.SocketAdaptor.shutdownInput(SocketAdaptor.java:430)
at org.jenkinsci.remoting.nio.Closeables$1.close(Closeables.java:20)
at org.jenkinsci.remoting.nio.NioChannelHub$MonoNioTransport.closeR(NioChannelHub.java:289)
at org.jenkinsci.remoting.nio.NioChannelHub$NioTransport$1.call(NioChannelHub.java:226)
at org.jenkinsci.remoting.nio.NioChannelHub$NioTransport$1.call(NioChannelHub.java:224)
at org.jenkinsci.remoting.nio.NioChannelHub.run(NioChannelHub.java:474)
... 7 more
Apr 22, 2014 8:56:08 AM jenkins.slaves.JnlpSlaveAgentProtocol$Handler$1 onClosed