Re: Persistence of process thread despite re-loading browser

Sounds like the JSP page is being cached somewhere (browser, proxty etc),
which will prevent the code from running on the second request. Set the
following headers to prevent this:

             response.setHeader("Cache-Control","no-cache"); //HTTP 1.1
             response.setHeader("Pragma","no-cache"); //HTTP 1.0
             response.setDateHeader ("Expires", 0); //prevents caching at
the proxy server

Cheers
Adrian



> -----Original Message-----
> From: Sam Seaver [SMTP:[email protected]]
> Sent: 14 April 2003 06:38
> To:   [email protected]
> Subject:      Persistence of process thread despite re-loading browser
>
> 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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