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Exception Handling with Weblogic portal 9.2

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I have developed a web based portal application using weblogic 9.2. I am facing few issues with it.

At times when user performs some activtities like searching for users, it throws a null pointer exception.

When i try to see the stack trace, it tells the class name but doesn't give me the line number in the method which caused exception. Instead it says UNKNOWN source.

I am confident there are no problems with the code by which NULL POINTER EXCEPTION can be thrown?

It is intermittent and not consistent Any ideas why it can happen and the solution to resolve this?

I am unable to trace the cause of this issue.

Any help will be highly appreciated.

Thanks in advance,
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Have you tried using the "debug" flags to get more information? You will find it under the servers --> server-name--> debug tab.I have used it before to get more information about the exception.

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