DWR

java.lang.NullPointerException
       at org.directwebremoting.dwrp.OutputAlarm.cancel(OutputAlarm.java:68)
       at org.directwebremoting.dwrp.PollHandler$1.run(PollHandler.java:185)
       at org.directwebremoting.dwrp.ThreadWaitSleeper.goToSleep(ThreadWaitSleeper.java:43)
       at org.directwebremoting.dwrp.PollHandler.handle(PollHandler.java:207)
       at org.directwebremoting.servlet.UrlProcessor.handle(UrlProcessor.java:103)
       at org.directwebremoting.servlet.DwrServlet.doPost(DwrServlet.java:146)
       at javax.servlet.http.HttpServlet.service(HttpServlet.java:710)
       at javax.servlet.http.HttpServlet.service(HttpServlet.java:803)

The OutputAlarm is created the handle method of org.directwebremoting.servlet.PlainPollHandler

I've modified the source to identify the source, otherwise only a message would be printed on the console: [directwebremoting.servlet.ExceptionHandler] Error: java.lang.NullPointerException.

The error isn't propagated to the error handler... I've even set the converters for the Exception and StackTraceElement.
This happens when using dwr 2.0.2 and Internet Explorer, DwrServlet has debug and activeReverseAjaxEnabled set to true.

If I set a breakpoint on the constructor of OutputAlarm and I resume the thread imediately after it's suspended, it throws a NPE even using Firefox... otherwise OutputAlarm.cancel() is not executed...