Answer Posted / k d rana

when request come from browser ,container send request and response object as a parameter to servlet , now when 2 or more servlet use same request object, means we forward existing request and response object to next servlet using
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requestDispatcher rs=req.getrequestDispatcher("url of next servlet");

rs.forward(req,resp);

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method ,and so on ,thus we make chain of servlet to resolve same request using same request object
this is know as servlet chaning..

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