IllegalStateException occur with RequestDispatcher

[Lokesh Malik]

Why do I get the error "IllegalStateException" when using the RequestDispatcher?

[Priya Jothi]

Hi,
Can u send the sample code where u got this IllegalStateException?.May be on seeing the code i can say why & where this exception is raised.

Regards,
Priya.

[Jeffrey Spaulding]

After using the dispatcher you can't use out.print.

One of the possible explanations.

But code would be cute

J.

[Adeel Ansari]

Originally posted by Lokesh Malik:
Why do I get the error "IllegalStateException" when using the RequestDispatcher?

Read the docs. It would be definitely helpful.

[Shailesh Chandra]

here is your answer

Shailesh

[Ben Souther]

Neither requestDispatcher.forward nor request.sendRedirect will stop the execution of your request on their own.

It is always a good idea to follow a call to either with a return statement.
Another approach is to structure the flow of your page with if statements so that the the call to forward or sendRedirect are always the last call in their respective branches.

if(some condition){
  rd.forward(request, response);
  return;
}

[Lokesh Malik]

req.setAttribute("message","No Record Found");
RequestDispatcher rd = req.getRequestDispatcher("../Error.jsp");
rd.forward(req,res);

here when i start Tomcat-server then at first time it shows rd=null;
and display the nullpointerexception but when i refresh the page it chows me the message.
So why at first time rd become null;

Originally posted by Priya Jothi:
Hi,
Can u send the sample code where u got this IllegalStateException?.May be on seeing the code i can say why & where this exception is raised.

Regards,
Priya.