Re: how am I hosing this Process?

You might want to drain both the inputstream and the errorstream with  
StreamPumpers (i.e. have separate threads read from the two streams).
http://src.opensolaris.org/source/xref/sfw/usr/src/cmd/ant/apache- 
ant-1.6.5/src/main/org/apache/tools/ant/taskdefs/Exec.java might give  
you some hints.

-hendrik

tagtraum industries incorporated
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On Feb 13, 2007, at 4:06 , Thomas L Roche wrote:

> I'm trying to run a bash script from Java in order to run it under
> JUnitPerf, but am failing miserably. Any suggestions about what I'm
> missing? except chops :-(
>
> I've called scripts from Java before, but not for awhile (i.e. back in
> the Runtime.exec days). Process/Builder looked like the way to go, so
> I coded up something like
>
>   public static void execute(List<String> l) throws RunnerException {
>     Process p = null;
>     ProcessBuilder pb = new ProcessBuilder(l);
>     String argsMsg = "\"" + Utils.list2String(l) + "\"";
>     // start debugging
>     Utils.logInfo("start output from " + argsMsg + ":");
>     Utils.logEnvironment(pb);
>     // end debugging
>     try {
>       p = pb.start();
>     } catch (IOException e) {
>       String errmsg = "Failed to run command=" + argsMsg;
>       throw new RunnerException(errmsg, e);
>     }
>     InputStream is = p.getInputStream();
>     InputStreamReader isr = new InputStreamReader(is);
>     BufferedReader br = new BufferedReader(isr);
>     String line;
>     try {
>       while ((line = br.readLine()) != null) {
>         Utils.logInfo(line);
>       }
>     } catch (IOException e) {
>       String errmsg = "Dropped output line from process";
>       throw new RunnerException(errmsg, e);
>     }
>     // start debugging
>     Utils.logInfo("end output from " + argsMsg);
>     // end debugging
>   }
>
> but nothing's happening ... except the logging above. From that I can
> tell that I'm calling the correct command line (i.e. argsMsg has the
> expected value, with a fully-qualified executable and all the
> arguments) and I've got a correct environment. But when I call the
> command from an xterm (FWIW I'm running on linux) Stuff Actually
> Happens (notably files get created in a directory, and a whole lot
> more logging happens); when I call the java app, nothing actually
> happens except the logging above. I.e. I get
>
> - start output from "<correct commandline/>":
> - start environment:
> <correct environment/>
> - end environment.
> - end output from "<correct commandline/>"
>
> when I should instead get
>
> + start output from "<correct commandline/>":
> + start environment:
> <correct environment/>
> + end environment.
> <LOTS MORE STUFF HERE/>
> + end output from "<correct commandline/>"
>
> plus lots of files in the output directory.
>
>
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