I guess, if instead of qx() you do: 
my $pid = open JVM,"java|" or die;

[download]
you can kill off the jvm process with kill TERM => $pid.
"What should it profit a man, if he should win a flame war, yet lose his cool?"

In reply to Re^2: How to forcefully destroy a thread by Joost
in thread How to forcefully destroy a thread by han_perl

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