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Asked: 2026-05-11T09:41:31+00:00

I’m trying to get to the bottom of a problem with our Java applet

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I’m trying to get to the bottom of a problem with our Java applet based program. It quite regularly seizes up with an unresponsive GUI (or a white screen). This of course only happens when deployed at a customer site :-(. They are running a version of the Sun JVM in 1.5 series (not sure the exact release).

We have a theory that it’s to do with the applet running out of heap space – does that sound plausible? The other thing that I have set up on my machine is disabling direct draw, but that was mainly to avoid weird artefacts on other applications.

They are seeing the problem on Citrix and on regular PCs, but obviously there is a limit to what the users on Citrix can do.

Any suggestions?

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1 Answer

  1. Running out of heap space should cause an OutOfMemoryError to be thrown. This case sounds like a typical deadlock. To find where that is you want a stack dump of all the threads. IIRC< you can do it through the console, or from IIRC 1.6 the JDK includes jps and jstack.

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