Tomcat: Servlet.service(): unbelievable getOutputStreamException

[Shishir Sanghvi]

Hi, i have a security check on all my jsp files like this:
(i can't use REALM or any component)

 /*************************SECURITY-ACCESS**********************************************************************/
 /*********User loggs himself and get a session on his role: if his role doesn't corresp to my jsp one's: acces denied****/
      String TestRole = (String)session.getAttribute("RoleSession"); 
      String Administrator = "Administrator";
        System.out.println(TestRole);
      if (TestRole == null || TestRole.equals(Administrateur)==false)
      
      {%><jsp:forward page="/Forbidden_Acces.html"/><%}

    else{WHAT MY JSP HAS TO DO} 

It worked fine during one day but now i have this error
----- Root Cause -----"getOutputStream()" has already been called for this response. at org.apache.coyote.tomcat4.CoyoteResponse.getWriter(CoyoteResponse.java:614). "Servlet.service()" for the servlet jsp has generated an exception
And now nobody can log-on!!!
I don't understand what did i wrong???
My God:now, even if i put my old jsp files, it is not workin' any more. Always the same message. What is wrong with the Tomcat Servlet???
Thanks alot for any suggestion
[ March 15, 2003: Message edited by: Shishir Sanghvi ]
[ March 15, 2003: Message edited by: Shishir Sanghvi ]

[Praful Thakare]

Hi,
I think there is problem in else part
by any chance r u using<jsp:include > for some header or menu
if this is the case then try commenting jsp:include and c if it works
regards
Praful