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Editorial Team
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Asked: 2026-06-10T17:21:20+00:00

I am implementing a mailx command through Runtime.exec and came across this article which

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I am implementing a mailx command through Runtime.exec and came across this article which explains the right way of doing it.

JavaWorld : Runtime.exec

I have been through the examples and see that they have introduced a new class StreamGobbler which accepts the InputStream and prints the output.
However I fail to understand the reason why this has been introduced. Can anybody please explain.

Also as part of my code , I have written the following 

OutputStreamWriter osw = new OutputStreamWriter(proc.getOutputStream())
osw.write(mailBody)
osw.close

Is this implementation correct or there are any pitfalls to it ?

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1 Answer

  1. Editorial Team

    Since your program can potentially succeed (which means the program’s output would be available on the Process' getInputStream()) or it can potentially fail (which means the program’s error would be available on the Process' getErrorStream(), you should be able to read these in parallel and hence the need for a separate thread which is implemented by the StreamGobbler class. Hope this clarifies to an extent.

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