Process.waitFor() error

Question

I am trying to run another java program from within a Servlet. Part of what I need to do is time it incase there is an endless loop, etc. My problem is this:
When I execute the program, using Runtime-exec(...), and feed it more than 20 arguments, it runs perfectly fine without Proc.waitFor(), when there are less than 21 arguments, it runs perfectly fine with proc.waitFor(), however, when there are more than 20 arguments, proc.waitFor hangs, and times out when there is an interrupted exception, generated by an "AlarmClock" class.
here is some code:
                Thread t = Thread.currentThread();
                long interval = 10000; // 10 seconds
                AlarmClock ac = new AlarmClock(t,interval);
                Thread clock = new Thread(ac);
                clock.start();
                proc = rt.exec(command,null,new File(full_dir));
                try {
                   proc.waitFor(); // <--this one hates me
                    clock.interrupt(); // stop the alarm clock
                }catch (InterruptedException ie) {  // we timed out and were interrupted by the alarm clock       
                proc.destroy();  // kill the process              
}Where command is a String array = {java,-classpath,<path>,<main file>, arg0, arg1,....,argN-1,argN}
if N > 20, then it hangs.
And AlarmClock just generates an interupted exception at the given interval.

Answer 1

I think I found the solution to my own Problem...
http://www.javaworld.com/javaworld/jw-12-2000/jw-1229-traps.html
-Dave