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Request Attribute doubt?

 
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Guys,

Why is that if I set a request attribute in a jsp and do a form action to a servlet and in the servlet, I'm unable to retrieve the request attribute??
 
Joe San
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It gave me a NullPointerException in my servlet!
 
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If you are doing a form action, this is requiring the client to make a NEW request to the server.

Instead, if you used <jsp:include> or <jsp:forward> (i.e. you are request dispatching instead), then the request object will be reused and your attribute will be there.

It's a lot the same as redirect vs. dispatch. The top one makes the client make the redirect by making a new request. The bottom one is doing things server side, and using the same request object.
 
Joe San
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Got it Mark!
 
Consider Paul's rocket mass heater.
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