[exec] Using Commons Exec for context-sensitive execution

[Yasser Al Masri]

What I'm trying to do is simply run a batch file that does some 
preparatory work necessary for the subsequent commands to be executed 
successfully (setting environment variables and stuff). To prove this I 
put together a sample that uses Commons Exec


publicclassTester{publicstaticvoidmain(String[]args)throwsException{Testertester
 =newTester();MyResultHandlerhandler 
=tester.newMyResultHandler();CommandLinecommandLine 
=CommandLine.parse("bash");PipedOutputStreamps 
=newPipedOutputStream();PipedInputStreamis 
=newPipedInputStream(ps);BufferedWriteros 
=newBufferedWriter(newOutputStreamWriter(ps));Executorexecutor 
=newDefaultExecutor();PumpStreamHandlerioh 
=newPumpStreamHandler(System.out,System.err,is);executor.setStreamHandler(ioh);ioh.start();executor.execute(commandLine,handler);os.write("export
 MY_VAR=test");os.flush();os.write("echo 
$MY_VAR");os.flush();os.close();}privateclassMyResultHandlerextendsDefaultExecuteResultHandler{@OverridepublicvoidonProcessComplete(finalintexitValue){super.onProcessComplete(exitValue);System.out.println("\nsuccess");}@OverridepublicvoidonProcessFailed(finalExecuteExceptione){super.onProcessFailed(e);e.printStackTrace();}}}But
 that prints empty string instead of the word
 "test". Any clues?

Re: [exec] Using Commons Exec for context-sensitive execution

[yalmasri]

posting to fix the formatting on other mailing archives



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Re: [exec] Using Commons Exec for context-sensitive execution

[Bernd Eckenfels]

Hello,

did you try to write actual line endings?

I tested your code and it worked on Windows (cygwin bash) after adding
\n like:

os.write("export MY_VAR=test\n");
os.flush();
os.write("echo myvar:$MY_VAR\n");

Gruss
Bernd

I also think the use of the common-executor makes this whole stuff
unecesary complicated. Especially if the alternative is a Java7 with
ProcessBuilder and redirectOutput();


Am Wed, 2 Apr 2014 01:54:30 -0700 (PDT)
schrieb yalmasri :

> posting to fix the formatting on other mailing archives
> 
> 
> 
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> View this message in context:
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Re: [exec] Using Commons Exec for context-sensitive execution

[yalmasri]

Bernd Eckenfels wrote
> Hello,
> 
> did you try to write actual line endings?
> 
> I tested your code and it worked on Windows (cygwin bash) after adding
> \n like:
> 
> os.write("export MY_VAR=test\n");
> os.flush();
> os.write("echo myvar:$MY_VAR\n");
> 
> Gruss
> Bernd

Thanks, that made the trick.

Bernd Eckenfels wrote
> I also think the use of the common-executor makes this whole stuff
> unecesary complicated. Especially if the alternative is a Java7 with
> ProcessBuilder and redirectOutput();

Yea, can't agree more



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