Re: Persistence of process thread despite re-loading browser

    I have done some preliminary testing on Linux 2.4.18-27.7.x, and I
have found based on the exit codes returned, that the Runtime.exec()
interface seems to be badly broken.  I'm not too sure that the problem
is a cache at this point.  What are you running on?

Sam Seaver wrote:

> Dear all,
>
> I have this code in a bean:
>
>
> public void doMonster(){
>        String[] cmd ={"/home/seaver/MONSTER/monster", "-i" + jobID,
> filePath + dir
> + pdbFileName};
>
>
>        try{
>            Process proc = Runtime.getRuntime().exec(cmd);
>            BufferedWriter output = new BufferedWriter(new
> OutputStreamWriter(proc.getOutputStream()));
>            BufferedReader input = new BufferedReader(new
> InputStreamReader(proc.getInputStream()));
>            BufferedReader error = new BufferedReader(new
> InputStreamReader(proc.getErrorStream()));
>
>
>            output.close();
>            input.close();
>            error.close();
>        }catch (Throwable t){
>            t.printStackTrace();
>        }
>    }
>
> I have a JSP page that simply runs doMonster, the bean's parameters are
> already in the bean, and the first time, monster runs very well.
>
> However, if I keep the browser window open, and even if I restart Tomcat,
> when I try to run monster from the JSP page again, it does not run!
> The JSP
> page creates the directory for the output files, but still, monster
> itself
> actually doesn't execute.
>
> I've been browsing through the web, and I've read somewhere that if a
> servlet starts an external thread, then that thread itself will
> persist even
> if the servlet is reloaded.  Is this true?
>
> If is I can see that I need to actually find this thread and kill it.
> For
> even if monster itself has finished running, the process wont run
> again.  It
> takes a few restarts of tomcat and reloading of the browser before i
> can get
> monster to run again, and I'm sure it's something to do with thread
> persistence.
>
> Does anyone have any insight?
> Thanks
> Sam
>
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