Double forward in one servlet

Question

I have one JSP page that have a form. When the button in this form is pushed, id called my MainServlet. This is an example of my Servlet

/***** MainServlet *****/    

/* Call the servlet that comunicate with database */  
request.getRequestDispatcher("Servlet1").forward(request,response)

/* Return on the same JSP that have invoke MainServlet */
request.getRequestDispatcher("myJsp.jsp").forward(request,response);

return;

This is wrong because when I push the button in the form, my server return an error: "Cannot forward after response has been committed"

How can I solve this problem?

Thanks.

Do you get java.lang.IllegalStateException: Cannot forward after response has been committed? — Masudul, Oct 03 '13 at 10:22

score 1 · Accepted Answer · answered Oct 03 '13 at 10:03

1

You cannot forward to two different resources at the same time.

You need to again forward from Servlet1 to myJsp.jsp using request.getRequestDispatcher("myJsp.jsp").forward(request,response);

You cannot just directly forward two times because when you do it once, your response is already committed and client will be served with the first resource.

You can use conditional statements which will forward to proper resource depending on the proper request.

answered Oct 03 '13 at 10:03

Prasad Kharkar

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I agree with you that I can't forward two times in one servlet. The problem is how to obtain the same ideal thing. – electrixx90 Oct 03 '13 at 10:26
@electrixx90, as per your requirement, I've updated my answer. You need to forward to the jsp through servlet. – Prasad Kharkar Oct 03 '13 at 10:30
If you I use in MainServlet: request.getRequestDispatcher("Servlet1").include(request, response); request.getRequestDispatcher("myJsp.jsp").forward(request,response); return; But that don't func even if that can be right. – electrixx90 Oct 03 '13 at 11:16
I mean, in Servlet1, use requestDispatcher to jsp – Prasad Kharkar Oct 03 '13 at 11:42
Ok the Servlet1 that I call with requestDispatcher in MainServlet must be mapped in the web.xml, is it right? – electrixx90 Oct 03 '13 at 12:15
If you are using java EE 5 version, then yes, If you are using java EE 6 then your servlet needs to be annotated with `WebServlet` annotation. – Prasad Kharkar Oct 03 '13 at 12:17
Can you give me an example? Because all servlet that I mapped in web.xml are like this: ... ... ... ... ... – electrixx90 Oct 03 '13 at 12:24
Ok that work for me but I don't know what is this "WebServlet annotation". Thanks a lot. – electrixx90 Oct 03 '13 at 12:30
@electrixx90 This will help you. http://docs.oracle.com/javaee/6/tutorial/doc/bnafu.html – Prasad Kharkar Oct 03 '13 at 12:33

score 0 · Answer 2 · answered Oct 03 '13 at 10:04

Once a request has been forward, the remaining codes are not executed. Its same like calling a return statement twice one after another in a method. If you want both forwards to work. You should use conditions, depending upon which, one of the forward statement will be executed.

Double forward in one servlet

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