Bug 30949 - After Failed Include, Request and Response not Unwrapped
Summary: After Failed Include, Request and Response not Unwrapped
Alias: None
Product: Tomcat 5
Classification: Unclassified
Component: Catalina (show other bugs)
Version: 5.0.27
Hardware: All All
: P3 normal (vote)
Target Milestone: ---
Assignee: Tomcat Developers Mailing List
Depends on:
Reported: 2004-08-30 23:54 UTC by Scott Goldstein
Modified: 2007-09-04 19:02 UTC (History)
1 user (show)


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Description Scott Goldstein 2004-08-30 23:54:36 UTC
In org.apache.catalina.core.ApplicationDispatcher.doInclude(ServletRequest 
request, ServletResponse response), after invoke() is called to perform the 
include, the request and response objects are normally unwrapped.  However, if 
a ServletException or IOException is thrown, the unwrapping does not take place.

This leads to problems in environments in which cross context includes are 
being performed.  For example, 

1.  Web App A performs an include to a Servlet in Web App B
2.  The Servlet in Web App B throws a ServletException
3.  Web App A catches the ServletException and attempts to forward to an error 

Step 3 above will fail due to the fact that the request has not been 
unwrapped.  The active request will contain the ServletContext of web app B and 
the jsp file will not be found.
Comment 1 Remy Maucherat 2004-08-31 00:29:43 UTC
Ok. Since I don't want to use a finally for that (as the exception is rethrown 
in invoke), I think moving the unwrapping in the invoke method (before the 
code which rethrows the exception) would be appropriate.
Comment 2 Scott Goldstein 2004-09-08 05:26:29 UTC
That seems like a reasonable solution.
Comment 3 Yoav Shapira 2004-09-28 13:34:31 UTC
OK, I've moved the ApplicationDispatcher unwrap requests to the invoke method 
as Remy suggested.  Done on both the Tomcat 5.0 and 5.5 CVS branches.
Comment 4 Peter Rossbach 2007-06-07 02:36:10 UTC
I detect a similar problem with wrapped request at ApplicationDispatcher.forward und include.
The wrapped request are not recylced after an exceptions. Arrg!

- With STRICT_SERVLET_COMPLAINS this means we have still a HTTPSession memory leak
- and at cluster crossContext session replication are not triggered.

Currently the only chance I see, is a double try/catch implementation. Look at my checkin at tomcat 
5.5.24 revision  545127.

But I don't really like the double try/catch for wrapped request!

Comment 5 Mike Calmus 2007-07-24 13:04:03 UTC
I'm running into an issue that I think is a side effect of this patch. When
forward() calls invoke() the request object now gets unwrapped. Then the forward
method again tries to unwrap the already unwrapped request. As a result I am
getting a ClassCastException in unwrapRequest (ApplicationDispatcher.java:814).
It seems like unwrapRequest should be setting wrappedRequest to null before
exiting so subsequent calls to the method don't do anything. Does this seem
Comment 6 Mark Thomas 2007-09-03 18:35:16 UTC
Mike - having stepped through the code, I don't see the problem you are
describing. If you still see the issue, please open a new Bugzilla item and
provide the steps to reproduce and/or a simple test war.
Comment 7 Mark Thomas 2007-09-04 19:02:45 UTC
I have committed a fix for this that doesn't require additional
try/catch/finally blocks. See r572854 (TC5.5.x) and r572856 (TC6.0.x)