Java Runtime.exec() with ssh on Linux Issues

Question

I am trying to start a new process using Runtime.exec(), but my problem lies within using ssh to remote in and then run a java program there. Code:

test = "ssh -t username@host java packageName.ClassName portNumber (Other command line args for this class)"
Process proc = Runtime.getRuntime().exec(new String[] {"/bin/bash", "-c", test});

this doesn't fail or catch, but I need to be able to see the stdout for the newly running process and I don't.

Note: if I run ssh -t username@host java packageName.ClassName portNumber (Other command line args for this class) from the command line it works fine. I have the host setup to not require a password by using ssh keys.

Any ideas?

Tim Bender · Accepted Answer · 2012-04-25 18:51:31Z

2

You need to use Process.getInputStream to obtain the output from the sub-process being created.

See this article for a good discussion on Runtime.exec.

answered Apr 25, 2012 at 18:51

Tim Bender

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Juan Alberto López Cavallotti · Accepted Answer · 2012-04-25 18:47:35Z

1

I think you can ask for an input stream that corresponds to the stdout of the process and then print it on your standard output. If you need to see it after it executes, just call waitFor() method on the process so it finishes before you start printing.

answered Apr 25, 2012 at 18:47

Juan Alberto López Cavallotti

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Adam Zalcman · Accepted Answer · 2012-04-25 18:48:19Z

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Use getInputStream() to access returned process's stdout. You can also use facilities provided by ProcessBuilder.Redirect.

answered Apr 25, 2012 at 18:48

Adam Zalcman

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