Why illegalstateexception in servlet

Have a question about this project? Sign up for a free GitHub account to open an issue and contact its maintainers and the community. Already on GitHub? Sign in to your account. This is occurring only on server glassfish but not in local machine. IllegalStateException: getWriter has already been called for this response at org. The text was updated successfully, but these errors were encountered:. Sorry, something went wrong. Error is occurring while invoking login method. IllegalStateException: getWriter has already been called for this response.

This error comes when a Servlet calls the getOutputStream method on response object for writing something after calling the include method. I guess in your view you are printing something, but the auth.

Can you try to execute something similar to the example? As ServletResponse the method getOutputStream definition says:. And when you try to render the jsp after forwarding the request it will throw response already committed server error. So comment out your printwriter instance and then try to forward the request to login.

This form the javadocs :. If the response already has been committed, this method throws an IllegalStateException. Uncommitted output in the response buffer is automatically cleared before the forward. You aren't returning after the forward method as that method does not magically terminates the code execution and jumps out of the method. You have to return from the method and stop the execution of the remnant of the code yourself.

Stack Overflow for Teams — Collaborate and share knowledge with a private group. Create a free Team What is Teams? Collectives on Stack Overflow. Learn more. IllegalStateException Ask Question. Asked 8 years, 4 months ago. Active 8 years, 4 months ago. Viewed 1k times. Redirects do not happen immediately, the servlet will continue execution and when it hits the next RequestDispatcher.

The server needs to send the http: redirect status code in the http response, the browser then receives the response and requests resource specified by the redirect url. It's a common misconception among starters that the forward method magically terminates the code execution and jumps out of the method somehow. This is thus not true. You have to return from the method and stop the execution of the remnant of the code yourself. Image encoding in java is pretty slow in general but you may also want to ensure you have the native libraries installed as they make quite a noticeable difference in performance.

The "committed" status of an HttpServletResponse is really a way of saying whether the response headers have been written to the underlying socket. A "committed" response has had at least the first line written.

Since the first line of the response contains the status code, it follows that you cannot change the status code of a committed response Similarly, you cannot do a local forward because you've already started sending the response. Servlet with java. IllegalStateException: Cannot forward after response has been committed [duplicate]. Asked 4 Months ago Answers: 5 Viewed times.