Merb app. deployed to Websphere 6.1 fails on both AIX and Windows

All,

Any Websphere - heads in the house?.

I've generated a WAR file around a small Merb. (0.9.3) app. using
Warbler (0.9.10).  Although I can get it to work fine in Websphere's
Community Edition (which is basically Apache Geronimo/Tomcat), I cannot
get it to work on Websphere 6.1 (on either AIX or Windows XP).  "Get it
to work" means successfully retrieve the request for "/" which is mapped
to my "users" controller, index action.

I know that the Web app. deployment has worked in Websphere because I
can retrieve all of the static resources (images, stylesheets) with no
problem.

Behavior in Websphere 6.1 on Windows XP:

1A) If I request "/", I see the following error:

[8/6/08 20:22:02:301 BST] 0000002d WebApp        E   [Servlet
Error]-[com.ibm.ws.wswebcontainer.extension.DefaultExtensionProcessor
incompatible with com.ibm.wsspi.webcontainer.servlet.IServletWrapper]:
java.lang.ClassCastException:
com.ibm.ws.wswebcontainer.extension.DefaultExtensionProcessor
incompatible with com.ibm.wsspi.webcontainer.servlet.IServletWrapper
    at
com.ibm.ws.webcontainer.extension.DefaultExtensionProcessor.handleRequest(DefaultExtensionProcessor.java:499)
    at
com.ibm.ws.wswebcontainer.extension.DefaultExtensionProcessor.handleRequest(DefaultExtensionProcessor.java:111)
    at com.ibm.ws.webcontainer.webapp.WebApp.handleRequest(WebApp.java:3107)
    at
com.ibm.ws.webcontainer.webapp.WebGroup.handleRequest(WebGroup.java:238)
    ....

This makes me think that the container is unable to handle just using
the RackFilter (org.jruby.rack.RackFilter) for some reason.

1B) If I request "/users/index" directly, I see the following errors:

[8/6/08 20:41:12:697 BST] 0000002d SRTServletRes W   WARNING: Cannot set
status. Response already committed.
[8/6/08 20:41:12:713 BST] 0000002d SRTServletRes W   WARNING: Cannot set
header. Response already committed.

Behavior in Websphere 6.1 on AIX:

2) If I request "/" or "/users/index", I see no errors in the out or err
logs, just "Error 404: SRVE0190E: File not found: {0} " on the screen.

Clearly the servlet filter isn't being picked up at all here.

My next step will be to insert a standard index.jsp file into the Web
app. and see if I can get a default "/" request to work that way.

Any insight that anyone can provide would be most appreciated.

Thanks,
Wes

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