Name: ea65 Date: 01/28/2000

I am filing this bug on behalf of Petr Nejedly.
  
This email from petr describes the problem.
  
Subject: PostEventQueue
   Date: Tue, 25 Jan 2000 16:22:55 GMT
   From: Petr Nejedly <###@###.###>
     To: ###@###.###
  
Hi
  
There's some problem with AWT. We aren't able to reproduce it, but it
occurs sometimes. The symptoms are that application stops responding
and repainting when this exception occurs:
  
The exception making problems:
  
> java.lang.NullPointerException
> at java.awt.EventQueue.postEventPrivate(EventQueue.java:116)
> at java.awt.EventQueue.postEvent(EventQueue.java:103)
> at sun.awt.PostEventQueue.run(SunToolkit.java:502)
  
makes PostEventQueue thread to die.
  
PostEventQueue's run method (excerpt from JDK1.3t
sun.awt.SunToolkit:482):
  
    /*
     * Continually post pending AWTEvents to the Java EventQueue.
     */
    public void run() {
        while (keepGoing && !isInterrupted()) {
            try {
                EventQueueItem item;
                synchronized(this) {
                    while (keepGoing && (queueHead == null)) {
                        notifyAll();
                        wait();
                    }
                    if (!keepGoing)
                        break;
                    item = queueHead;
                }
                eventQueue.postEvent(item.event);
                synchronized(this) {
                    queueHead = queueHead.next;
                    if (queueHead == null)
                        queueTail = null;
                }
            } catch (InterruptedException e) {
                keepGoing = false; // Exit gracefully when interrupted
                synchronized(this) {
                    notifyAll();
                }
            }
        }
    }
  
  
The problem is that this thread is not imunne to exceptions in
eventQueue.postEvent(),
I think it would be done such way the AWT-Event-Que is - try/catch
printing exception happened
during event dispatching.
  
IMHO the real problem lies somewhere in AWT-Motif, propably sending
item with item.event == null
and java.awt.EventQueue.postEvent will fail in this section
(java.awt.EventQueue:116):
                int id = theEvent.getID();
               
  
Petr Nejedly, SUN Microsystems
###@###.###

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