filter.java

public class FilterLogin implements Filter {
  public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain){
    // inject cookie
    Cookie c = getCookie(httpServletResponse, "WASReqURL");
    if(c  == null){
      // inject the cookie if it is not there
			c = new Cookie("WASReqURL", "");
			httpServletResponse.addCookie(c);	
		}
    String newUrl = "/my_action_servlet";
    // update the cookie value with the new url
    c.setValue(newUrl);
    
    // continue to the j_security_check
    chain.doFilter(request, response);
  }
}