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User Name in JSR168 Portlet

 
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I have a JSR168 Portlet which runs on WebSphere Portal Server(5.1). I want to get hold of the user name from the WPS. I have tried to get the username unsuccessfully by doing "RenderRequest.getUserPrincipal().getName()", but the value comes out to be "null". Any Ideas on how to get the username.

Thanks
Praveen
 
Where all the women are strong, all the men are good looking and all the tiny ads are above average:
We need your help - Coderanch server fundraiser
https://coderanch.com/t/782867/Coderanch-server-fundraiser
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