can't disable Log

I noticed each time I configure my server the following message is logged (to
stderr):

10:56:04.415 EVENT  Checking Resource aliases

So I added the statement:

org.mortbay.util.Log.instance().disableLog();

but it has just changed the output to:

1094807911733: EVENT  ,Checking Resource
aliases,[Thread-0]org.mortbay.util.FileResource.<clinit>(FileResource.java:46)

As I don't want ANY log message be displayed, how can I turn logging off?
Thx




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