CODEWITHSUNDEEP
java
dtech
dtech

Reputation: 14060

Disable System.err

Is there a way to set the stream System.err so everything written to it is ignored? (i.e. discarded not outputted)

Upvotes: 22

Views: 8124

Answers (6)

Marcel
Marcel

Reputation: 1

The other Answers aren't incorrect.
I think with the use of the nullOutputStream() Function from the PrintStream Class it gets easier to understand what is happenening with less overhead.

System.setErr(new PrintStream(PrintStream.nullOutputStream()));

If you want to restore the original Error Stream later save it before overriding it:

PrintStream origStream = System.err;
System.setErr(new PrintStream(PrintStream.nullOutputStream()));

// Do your Sutff here which is printing to System.err

System.setErr(origStream);

Upvotes: 0

Daniel Hári
Daniel Hári

Reputation: 7774

Using commons-io's NullOutputStream, just:

System.setErr(new PrintStream(new NullOutputStream()));

Upvotes: 0

Peter Lawrey
Peter Lawrey

Reputation: 533740

You can use System.setErr() to give it a PrintStream which doesn't do anything.

See @dogbane's example for the code.

Upvotes: 18

Hurda
Hurda

Reputation: 4715

Just set Error to dommy implementation:

System.setErr(new PrintStream(new OutputStream() {
            @Override
            public void write(int arg0) throws IOException {
                // keep empty
            }
        }));

You need to have special permission to do that. 

RuntimePermission("setIO")

Upvotes: 5

cb0
cb0

Reputation: 8623

You could redirect the err Stream to /dev/null

OutputStream output = new FileOutputStream("/dev/null");
PrintStream nullOut = new PrintStream(output);
System.setErr(nullOut);

Upvotes: 1

dogbane
dogbane

Reputation: 274778

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

Upvotes: 44

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