Java EE (Java Enterprise Edition) General Discussion

Hi everyone! My problem is that i have a specific service that takes some time to be executed.

So a user enters in a form some data and then i send him to waiting page. After the execution of the service i want him to redirect him to the page where he can view the results.

The way i am trying to solve this problem is that print the waiting page and after that i have my service started. So basically at the end of it i have a response.sendRedirect() but it doesn 't seem to work.
Note that the previous function is places after sending the response to the user (i am using Java Servlet)