How to write Web Service Log to a file in Java

Hi..
I have a requirement that I need to maintain Log file of my web service which is deployed on OC4J server.
Is there any API for this ? Or any other way to do it ?
Regards,
Ajay

Hi..
Thanks.
Instead of using Logging API, I created own class to handle Log.
But my issue is When Ever I am appending Log to already created file the following Line is also appending.
<?xml version = '1.0' encoding = 'UTF-8'?>I want this Line only one time in each log file.
What should I do for this ?
Regards,
Ajay

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