How to permanently clear Output in Netbeans 7

I'm using Netbeans7.

When I run my w开发者_开发百科ebapp I see a lot of info in Output tab. I doing Ctrl+L so tab getting blank. But when I run webapp one more time, all previous text appears again.

Is there a way to clear Output permanently?

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Yes ... Probably it read from the log of the used server.Clean that and will solve your problem.