I used a module that's been around for awhile: Proc::Reliable. It seems to do what you want. 
#!/usr/bin/perl

use strict;
use warnings;
use Proc::Reliable;

my $proc = Proc::Reliable->new( 'num_tries'    => 5,
                                'time_per_try' => 60,
                                'maxtime'      => 60);
Proc::Reliable::debug(1);

my $out = $proc->run('java -jar program.jar');
if($proc->status) {
    print($proc->stderr);
    exit;
}
else {
    print($proc->stdout);
}

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In reply to Re: killing a process after some time by Khen1950fx
in thread killing a process after some time by perlrocks

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