Calling setLocation(-2000,-2000) on JFrame kills the app without exception

Hi All,
I am working on a Java appliction which is supposed to run a specialized hardware.
JDK Version 1.5
Windows version Win 2000
The environment in which this app is supposed to run is strictly controlled by another application (for e.g. user should not be able to access desktop). The kind of apps which are written for dedicated hardwares in music stores, ATMs etc.
I don't have much information about what all aspects of windows are controlled by this other app, but under some configuration of the environment on that device, my applicaiton dies just when setLocation(-2000, -2000) is called, but only 1 time out of 50.
I tired it several time, and it always dies while executing setLocation API, without any exception being thrown. The log statement before setLocation appears in log but not the one after it.
I am logging uncaught exceptions on console also to log file, but nothing there... The thread just dies..
Any pointers / suggestions or sulution will be of great help.
Thanks
Regards

Thanks to all of you for your response.
We are setting location to -2000, -2000 "AS WELL AS" setVisible(false)
We need to do both because this BOSS applicaiton which monitors other applications running on the hardware keeps a windows handle of our Java window. When user chooses to switch to our application from a Menu, the BOSS application uses ShowWindow window API to display that window. There are two issues with that approach
(Note that we can't change the behavior of the BOSS application)
1. when ShowWindow API is used to display a Java window, its only the native peer window which gets displayed. None of the Java controls on that window display. The window just appears blank.
Its disfficult to explain, so you'll have to write small prototype to see it yourself. Write Java app to display window, find its window handle, hide the window in Java, and then write a C / .Net app to show that window.
Apparently Java doesn't get to know WinAPI is used to show window outside of Java.
2. Like I said in such case apparently Java doesn't get to know when window has been displayed. None of the window related events get fired. There are cases when although BOSS app wants to display our 'registered' window, we want to display some other window. Since we don't get to know about other window getting displayed, we cannot hide it.
Keeping it at -2000, -2000 ensure that even if BOSS displays it, it stays out of users view, unless we bring it back to 0,0 and do some other stuff...
Any other pointers which might be of help are most welcome.
Thanks for your help

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[svn:bz-4.0.0_fixes] 16148: Update config testsuite on 4.0. 0_fixes branch to force kill the app server before running any tests when the app server is Tomcat .

Revision: 16148
Revision: 16148
Author:   [email protected]
Date:     2010-05-17 06:40:40 -0700 (Mon, 17 May 2010)
Log Message:
Update config testsuite on 4.0.0_fixes branch to force kill the app server before running any tests when the app server is Tomcat. The regression runs were hanging on this branch when going to run the config suite because the Tomcat server isn't shutting down cleanly at the end of the MXUnit run. I believe this is an issue with the version of ActiveMQ we are using. Since I don't think we want to update ActiveMQ on this branch force killing the Tomcat server will workaround the problem.
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===================
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===================
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Calling setLocation(-2000,-2000) on JFrame kills the app without exception

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