[PATCH] JDK-7170447: Intermittent DeadListenerTest.java failure

[Jaroslav Bachorik]

Looking for review and a sponsor.

Webrev at http://cr.openjdk.java.net/~jbachorik/7170447/webrev.00

In this issue the timing is the problem. MBeanServer.unregisterMBean()
fires the "unregister" notification which is sent to the server
asynchronously. Thus it may happen that the "unregister" notification
has not been yet processed at the time of invoking
removeNotificationListener() and the notification listeners hasn't been
cleaned up leading to the test failure.

There is no synchronization between the client and the server and such
race condition can occur occasionally. Normally, the execution is fast
enough to behave like the "unregister" notification is processed
synchronously with the unregisterMBean() operation but it seems that
using fastdebug Server VM bits with the -Xcomp option strains the CPU
enough to make this problem appear.

There is no proper fix for this - the only thing that work is waiting a
bit longer in the main thread to give the notification processing thread
some time to clean up the listeners.

Regards,

-JB-