Assign System.err to bit bucket

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RonS - 29 Nov 2003 23:56 GMT

Is there a way to assign System.err so that messages are discarded? I
tried assigning it to null, which compiles, but causes a run time error.

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Anthony Borla - 30 Nov 2003 00:13 GMT

> Is there a way to assign System.err so that messages
> are discarded? I tried assigning it to null, which compiles,
> but causes a run time error.

Try:

// *NIX / Linux
PrintStream nps = new PrintStream(new FileOutputStream("/dev/null"));
System.setErr(nps);

or:

// Win32
PrintStream nps = new PrintStream(new FileOutputStream("NUL:"));
System.setErr(nps);

I hope this helps.

Anthony Borla

P.S.

Remember to save, then reset, the standard error stream. Example:

// Save old stream
PrintStream ops = System.err;
...
// Change stream and do stuff with it ...
nps = ...;
System.setErr(nps);
...
...
// Close stream
nps.close();

// Restore old stream
System.setErr(ops);

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Dave Glasser - 30 Nov 2003 04:29 GMT

"Anthony Borla" <ajborla@bigpond.com> wrote on Sun, 30 Nov 2003
00:13:51 GMT in comp.lang.java.help:

>> Is there a way to assign System.err so that messages
>> are discarded? I tried assigning it to null, which compiles,
[quoted text clipped - 11 lines]
> PrintStream nps = new PrintStream(new FileOutputStream("NUL:"));
> System.setErr(nps);

Or this should work on any platform:

System.setErr(new PrintStream(new OutputStream() {
public void write(int b) {}
}));

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Anthony Borla - 30 Nov 2003 05:21 GMT

> "Anthony Borla" <ajborla@bigpond.com> wrote on Sun, 30 Nov 2003
> 00:13:51 GMT in comp.lang.java.help:
[quoted text clipped - 22 lines]
> public void write(int b) {}
> }));

Yes, indeed, it does, it effectively discards everything sent to it, fully
meeting the OP's requirements, and is quite portable to boot. I think I was
stuck in 'bit bucket' mode :) !

Cheers,

Anthony Borla

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RonS - 30 Nov 2003 06:38 GMT

>>Is there a way to assign System.err so that messages
>>are discarded? I tried assigning it to null, which compiles,
[quoted text clipped - 33 lines]
> // Restore old stream
> System.setErr(ops);

Thanks Anthony

Exactly what I needed!

Ron

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Assign System.err to bit bucket

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