Java viewer freeze on jre4 and 5 but not on jre6

[Dan F. <df...@em...>]

Have other people had a viewer freeze?

Java viewer running under jre4 and jre5 freezes RFB display. Happens
only on some of our test machines. Never happens on jre6.

This is tightvnc 1.2.9 java viewer on Windows XP. Never happens on
linux.  The network is fine. The problem duplicates under both application
and applet, for any browser. Java memory heap is fine.


We have characterized the problem as most likely timing dependent. Under
certain conditions, certain machines. Seems like VncCanvas repaint() is
scheduled, but never executed.

   void scheduleRepaint(int x, int y, int w, int h) {
     // Request repaint, deferred if necessary.
     repaint(viewer.deferScreenUpdates, x, y, w, h);
   }