2011/12/26 Jerry Malcolm <2ndgenfi...@gmail.com>:
> Konstantin,
>
> Thanks for the info. I think I'm getting close. As a test, I have created
> a valve that just forces a redirect. It compiled fine. I registered it
> under the 'host' tag next to the other valves in server.xml. When I send a
> request in, my print statements write to System.out just as expected.
>
> The only problem is, the request forward goes nowhere. Just white screen
> on the browser. The requestDispatcher returns without any exceptions. But
> I can't find anything in the logs saying anything was wrong. The code is
> simple:
>
> public void invoke(Request request, Response response) throws IOException,
> ServletException {
> System.out.println( "in Valve" );
> try {
> RequestDispatcher requestDispatcher = request.getRequestDispatcher(
> "/cismanager/jsp/user/home.jsp" );
In short,
1) dispatcher is always relative to Context.
You must get Context first (from a Mapper?) and then get Dispatcher
from there. (Dropping the "cismanager" part from the URL).
If you were doing it from a Filter you would call
ServletContext.getContext(String) followed by
ServletContext.getRequestDispatcher().
Note that ServletContext.getContext(String) returns null for better
security, unless you explicitly set <Context crossContext="true"/> in
the target web application.
2) using a RequestDispatcher you will get the same result as with
using it from inside a Filter. That is it will be a usual "forward",
and auth constraints wouldn't apply.
Here are tips for debugging Tomcat:
https://wiki.apache.org/tomcat/FAQ/Developing
> System.out.println( "should get here" );
> requestDispatcher.forward( request, response );
> System.out.println( "return from forward");
> }
> catch( Throwable e) {
> e.printStackTrace( System.out );
> }
> // getNext().invoke(request, response);
> }
>
> I figure it's something to do with the URL. I have never used a
> RequestDispatcher obtained from the Request object outside of a webapp
> context. From what you said, the valve is 'above' the contexts at the
> 'host' level. So I assume the parsing of the context out of the URL has
> yet to occur and therefore should happen in my 'forward'. Hence, I used
> the entire URL (after the domain name) in the forward. In the example
> above, I have the webapp mapped to "/cismanager".
>
> Am I close? Or is this totally wrong? Should I not use the
> RequestDispatcher? Should I somehow wrapper the request object and set the
> new URL in that?
>
> Thanks again for all the help.
>
> Jerry
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