Hello,
On Tuesday 03 August 2004 7:44 am, Shapira, Yoav wrote:
> Your servlet using sendError is fine. You would then configure an error
> page for this error in your web.xml using the <error-page> directive.
> The server will go to this error page, which can be a servlet, JSP, or
> static page as you wish. This error page will have a fresh response
> object to which you can write whatever you want.
I wrote a quick little servlet to verify whether indeed I had a "fresh"
response object or not, and it doesn't appear that I do. Servlet 1, did the
following:
doGet(HttpServletRequest request, HttpServletResponse response) {
ServletOutputStream out = response.getOutputStream();
sendError(HttpServletResponse.SC_NOT_FOUND);
}
Then, I set the error-page directive so that servlet 2 would receive the
error. Servlet 2 then did the following:
doGet(HttpServletRequest request, HttpServletResponse response) {
PrintWriter out = response.getWriter(); // could call getOutputStream...
out.println("doh!");
}
When servlet 2 tried to call getOutputStream(), it resulted in a traceback:
ApplicationDispatcher[/kaleb] Servlet.service() for servlet TestServlet1 threw
exception java.lang.IllegalStateException: getOutputStream() has already been
called for this response at
org.apache.coyote.tomcat5.CoyoteResponse.getWriter(CoyoteResponse.java:599)
at
org.apache.coyote.tomcat5.CoyoteResponseFacade.getWriter(CoyoteResponseFacade.java:163)
at TestServlet1.doGet(TestServlet1.java:20)
So, in what case do I really get a fresh response object? Can a response
object be considered fresh if you can't write to it?
Thanks again.
--Kaleb
> You don't need to subclass ServletOutputStream or PrintWriter. In fact
> it's fairly rare that you'd need to extend these for servlet
> applications.
>
> You can accomplish a similar thing to the above declarative error-page
> behavior by using response.sendRedirect in your original servlet that's
> now using sendError.
>
> Yoav Shapira
>
>
>
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