Continue the chain of filters after forward doesn't work

Question

Hi,
I'm dealing with a problem since two days ago and I guess it's time to ask for some help =).
I'm trying to do a forward and just after that let the filters continue, maybe I have a missunderstanding of the servlet/jsp life cicle, but don't really know.
Let's say I have two filters
A) URLTranslatorFilter. This filter take the URL requested and forward it to the correct URL, so, the user can enter the URL in another language (creepy requirement I know =( ) and being redirected to the actual resource.
http://localhost:8080/test01/entrar.faces
would be translated to
http://localhost:8080/test01/login.faces
B) SessionFilter, it's a simple filter that check for the user being on a session, security control, simple as that.
When a URL It's translated, just after that I have to check the username and all that kind of things, but i get the terrible error:
javax.servlet.ServletException: Cannot forward after response has been committed
the filterChain.doFilter isn't working I think.
In fact, there's more than just a filter after the URLTranslatorFilter, but I can't get it to work even with two of them.
The source for the URLTranslatorFilter:
package mx.www.filter;
import java.io.IOException;
import javax.servlet.Filter;
import javax.servlet.FilterChain;
import javax.servlet.FilterConfig;
import javax.servlet.RequestDispatcher;
import javax.servlet.ServletException;
import javax.servlet.ServletRequest;
import javax.servlet.ServletResponse;
import javax.servlet.http.HttpServletRequest;
public class URLTranslatorFilter implements Filter {
     public void init(FilterConfig arg0) throws ServletException {
     public void doFilter(ServletRequest request, ServletResponse response,
               FilterChain chain) throws IOException, ServletException {
          System.out.println("URLTranslatorFilter-->");
          if (!(request instanceof HttpServletRequest)) return;
          HttpServletRequest httpServletRequest = (HttpServletRequest) request;
          String currentURI = httpServletRequest.getRequestURI();
          System.out.println("URI-->" + currentURI);
          if (currentURI.equals("/test01/entrar.faces")) {
               RequestDispatcher requestDispatcher = request.getRequestDispatcher("/test01/login.faces");
               requestDispatcher.forward(request, response);
          chain.doFilter(request, response);
          System.out.println("<--URLTranslatorFilter");
     public void destroy() {
}The simple dummy SessionFilter:
package mx.nic.rty.www.filter;
import java.io.IOException;
import javax.servlet.Filter;
import javax.servlet.FilterChain;
import javax.servlet.FilterConfig;
import javax.servlet.ServletException;
import javax.servlet.ServletRequest;
import javax.servlet.ServletResponse;
public class SessionFilter implements Filter{
     public void init(FilterConfig arg0) throws ServletException {
     public void doFilter(ServletRequest request, ServletResponse response,
               FilterChain chain) throws IOException, ServletException {
          System.out.println("SessionFilter-->");
          chain.doFilter(request, response);
          System.out.println("<--SessionFilter");
     public void destroy() {
}The filters defined in web.xml
     <filter>
          <filter-name>URL Translator Filter</filter-name>
          <filter-class>mx.nic.rty.www.filter.URLTranslatorFilter</filter-class>
     </filter>
     <filter-mapping>
          <filter-name>URL Translator Filter</filter-name>
          <url-pattern>*.faces</url-pattern>
     </filter-mapping>
     <filter>
          <filter-name>Session Filter</filter-name>
          <filter-class>mx.nic.rty.www.filter.SessionFilter</filter-class>
     </filter>
     <filter-mapping>
          <filter-name>Session Filter</filter-name>
          <url-pattern>*.faces</url-pattern>
     </filter-mapping>The sample pages do nothing really just show a simple message, any help you could give me would be appreciated.
I can post more code if necessary =) thanks!
-JF-

Answer 1

Maybe try it like this:
if (currentURI.equals("/test01/entrar.faces")) {
  RequestDispatcher requestDispatcher = request.getRequestDispatcher("/test01/login.faces");
  requestDispatcher.forward(request, response);
else{
  chain.doFilter(request, response);
}Forwarding control to a request dispatcher is sending a response
calling chain.doFilter() is also sending a response.
You can only send one response per request, so if you forward control to another resource, you should stop the current resource sending a response.