I don't think there's anything wrong with a System.exit(0) if it's at the
end of your program. You probably have at least one non-daemon thread
hanging around which is why the JVM won't terminate. No doubt this was
started by JTOpen and maybe should have been marked as a daemon thread.
FYI, the JVM will terminate only if all non-daemon threads have completed.
If a thread is marked as a daemon thread, it can still be active and the JVM
will terminate but if the thread is not marked as a daemon, the JVM will
wait for it to finish.

If you're using a debugger, it should be able to tell you what threads are
still around. Otherwise, you can try something like this which I haven't

Thread[] ta;
for (int i = 0; i < ta.length; i++)
System.err.println("Thread " + i + " = " + ta[i] + "; daemon = " +

-----Original Message-----
From: java400-l-bounces@xxxxxxxxxxxx [mailto:java400-l-
bounces@xxxxxxxxxxxx] On Behalf Of James Lampert
Sent: Thursday, May 01, 2008 12:27 PM
To: Java Programming on and around the iSeries / AS400
Subject: Re: JTOpen ProgramCall doesn't work

Gary L Peskin wrote:
It looks like you're getting to your "services disconnected" print
Are you hanging after that line?


Could it perhaps be that some spawned-off thread is hanging? That the
exceptions I get with the trace turned on might have something to do
with the problem?

If I add a "System.exit(0)" call at the end, the program terminates, of
course, but I feel like that amounts to trying to thread a needle with

James H. H. Lampert
Touchtone Corporation

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