Re: problems getting stderr and stdout from process object

From:
Daniel Pitts <newsgroup.spamfilter@virtualinfinity.net>
Newsgroups:
comp.lang.java.programmer
Date:
Thu, 24 Sep 2009 11:52:19 -0700
Message-ID:
<6ePum.20025$944.9680@newsfe09.iad>
horos22 wrote:

All,

I'm using the following idiom to get stderr and stdout from a java
process (iterating first over stderr, and then over stdout), and am
running into a world of hurt.

What is happening is that the input stream seems to be 'getting
stuck'; ie: my guess is some internal buffer associated with the
InputStream fills up for stdout which causes the first loop to hang.

Actually, what may be happening is that the process itself isn't
finishing because it is blocking on something else altogether. It is
also possible that the stderr buffer is full, so the process blocks
until *it* completes.

In general, you will need to read the stdout and stderr from separate
threads. This is a flaw in the API in my opinion.

So my question is - is there a way to 'interleave' the output from the
two input streams?

Look into ProcessBuilder, I seem to recall there is a way to ask for
interleaved output (you won't be able to tell which was which, however).
<http://java.sun.com/javase/6/docs/api/index.html?java/lang/ProcessBuilder.html>

Look at "redirectErrorStream".

--
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