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processAction method doubt

 
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Hi all ,
I am new to portlets . I am using Jboss portal.
What I want to know is...
1. Whenever any action occur we can use action url .
we have to override processAction method where actual action or business logic would be..
I have to display contents of an object which I have in my processAction. So my question is , Is it needed to override render method . Or keep values in a session in order to get the object from processAction into my doView method...
i.e I want to know how to get object in processAction() into my doView().

2. Second Question
is it needed to override render method ... like we do for processAction() and doView()

Thanks
Lalit
 
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