[jboss-jira] [JBoss JIRA] (AS7-4935) JSP rendering via AsyncContext.dispatch returns blank page

Thu May 31 17:13:20 EDT 2012

Rossen Stoyanchev created AS7-4935:
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             Summary: JSP rendering via AsyncContext.dispatch returns blank page
                 Key: AS7-4935
                 URL: https://issues.jboss.org/browse/AS7-4935
             Project: Application Server 7
          Issue Type: Bug
          Components: Web
    Affects Versions: 7.1.1.Final
            Reporter: Rossen Stoyanchev
            Assignee: Remy Maucherat

The scenario involves:

# ServletA forwards to Servlet B
# ServletB calls request.startAsync and starts new thread
# New thread renders JSP

For the JSP rendering if asyncContext.dispatch("") is used I get a blank page in the browser. 
However if request.getRequestDispatcher("") is used along with forward/include, rendering succeeds.

I didn't see any exception in standalong/log/server.log but maybe I didn't enable logging correctly.

Here you can find a project to use along with instructions:
https://github.com/rstoyanchev/dispatch-test

Beyond the bug I would like to confirm it is safe to use request.getRequestDispatcher from an async thread. 
The spec doesn't say otherwise and it seems to work in AS 7.

This Servlet Spec discussion provides more detail behind this question: 
http://java.net/projects/servlet-spec/lists/users/archive/2012-05/message/10

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