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DisplayTag External Paging with Struts2

 
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Hi all,
Am newbie to Struts2 and DisplayTag. Am trying to use External Paging in DisplayTag. I've taken a reference from DisplayTag site DisplayTag External Paging

As to get the parameters from TableTagParameters, i've implemented ServletRequestAware in my action class. Before calling Service layer am initiating the variables needed to pass to fetch only particular data from DB. But everytime request parameters are null only. On top of that am getting the OGNL inappropriate expression error for the displaytag parameteres, as it generates the parameter starts with d-.


My Action class code is:


when i try to print

iPageStartIndex

always it throws null pointer exception. is this because OGNL not allowing the parameter or am i missing some code? please help me out.
 
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