Re: Terminating a process tree

From: Wayne Marrison (wayne_at_wmcomputing.com)
Date: 11/09/04 

Date: Tue, 9 Nov 2004 11:34:46 -0000

"marcus" <marcus@welby.md> wrote in message
news:41902F06.1010001@welby.md...
> Hey Wayne,
> Since you agree this isn't the correct way to do it and you need a hack, I
> can suggest one that has worked for me in FreeBSD (should work in any
> linux type environment). Instead of launching the second java program
> directly I used a control script (stolen from my apache setup, I think)
> that records the PID in a dedicated text file. When I needed to kill it I
> invoked the control script, which issued the OS kill command on the
> recorded PID. Kills it dead as far as I know.
>
>
> Wayne Marrison wrote:
>> (posted yesterday in comp.lang.java.help, but not sure if that was the
>> right place and had no response, so posting in here today, sorry for the
>> additional bandwidth to those that subscribe to both groups)
>>
>> Hi group,
>>
>> I'm new here, so apologies if I ask this in the wrong way.
>>
>> I have been programming in java for about 2 months, and am currently
>> trying
>> to control an external application that I start using:
>>
>> Process proc;
>> Runtime rt;
>>
>> proc = rt.exec("java.exe -cp ... etc.. something");
>>
>> Then I capture the input/output & error streams and thread them off.
>>
>> The problem I have, is that I need to architect for the eventuality of
>> the
>> external process locking up and not responding to requests. I have the
>> whole capturing of streams in a timeout, so I can tell when the external
>> program has not responded within a reasonable time, however when I issue
>> the
>> proc.destroy() method, the java.exe process takes up almost 100% cpu and
>> never stops. I have to use operating system tools to perform a manual
>> kill
>> of the process.
>>
>> I can only assume that the proc.destroy() doesnt kill the entire process
>> tree, and because the command line starts off java.exe, which runs the
>> something.class file, a process is orphaned somewhere.
>>
>> Any help would be much appreciated.
>>
>> Thanks
>>
>> Wayne
>>
>>
>

Hi Marcus,

I'm not sure how I would achieve this under Windows. I have looked at
calling the "kill.exe" or the "taskkill.exe" directly, but then fall into
the trap of trying to get the PID of the command I have just started. I
know there are suggestions on using JNI to achieve that, but the learning
curve is too great for me at this point.

I dont know how under windows to get the PID of an application using
batch/script commands .. maybe I'd best rethink this as the complexities are
starting to outweigh the benefits.

Thanks for your help.

Wayne

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