Re: Catching RequestDispatcher not found errors

[Stephen Suen]

On 5/19/06, Mark Thomas <[EMAIL PROTECTED]> wrote:

The RequestDispatcher is created in this class:

http://svn.apache.org/repos/asf/tomcat/container/tc5.5.x/catalina/src/share/org/apache/catalina/core/ApplicationContext.java

ApplicationDispatcher implements RequestDispatcher

http://svn.apache.org/repos/asf/tomcat/container/tc5.5.x/catalina/src/share/org/apache/catalina/core/ApplicationDispatcher.java

The wrapper that checks if it is included before calling sendError is

http://svn.apache.org/repos/asf/tomcat/container/tc5.5.x/catalina/src/share/org/apache/catalina/core/ApplicationHttpResponse.java

HTH,

Mark

Thanks for your help.

Acording to the API, sendError from the *included servlet* will be ignored.
I think maybe this doesn't necessarily mean *Tomcat itself* can't do it. If
i'm trying to include a resource not existed after the response being
committed, the error message will be appended to the response, and sendError
be ignored.

Here's the snippet from
http://svn.apache.org/repos/asf/tomcat/container/tc5.5.x/catalina/src/share/org/apache/catalina/servlets/DefaultServlet.java
:

   if (requestUri == null) {
       requestUri = request.getRequestURI();
   } else {
       // We're included, and the response.sendError() below is going
       // to be ignored by the resource that is including us.
       // Therefore, the only way we can let the including resource
       // know is by including warning message in response
       response.getWriter().write(
           sm.getString("defaultServlet.missingResource ",
           requestUri));
   }

   response.sendError(HttpServletResponse.SC_NOT_FOUND,
                      requestUri);

If the response has already been committed, doing that will get a 404 error
page returned to the client, that means Tomcat set this status somewhere
else, or from some wrapper, but I failed to find it.

Any idea?

Best Regards

Stephen