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From "Sam Seaver" <samsea...@hotmail.com>
Subject Re: Persistence of process thread despite re-loading browser
Date Thu, 17 Apr 2003 00:51:22 GMT


"JC Rules"




>From: Adrian Janssen <ajanssen@TRUWORTHS.CO.ZA>
>Reply-To: "A mailing list for discussion about Sun Microsystem's Java       
>         Servlet API Technology." <SERVLET-INTEREST@JAVA.SUN.COM>
>To: SERVLET-INTEREST@JAVA.SUN.COM
>Subject: Re: Persistence of process thread despite re-loading browser
>Date: Tue, 15 Apr 2003 09:06:33 +0200
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>FILETIME=[62D14550:01C3031E]
>
>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:samseaver@HOTMAIL.COM]
> > Sent: 14 April 2003 06:38
> > To:   SERVLET-INTEREST@JAVA.SUN.COM
> > 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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