BlazeDS Servlet in web.xml

[con19m31]

Note: I've edited title as old one was a little misleading based on recent investigation.

I've integrated BlazeDS with Grails, using Spring under the hood techniques. When I add a new servlet and mapping to the web.xml, I receive exceptions whether it is a Flex client request or browser request.

This is little off track for this forum, but perhaps someone has seen this sort of issue. It is kind of a web.xml and DispatcherServlet question (or perhaps more about how Grails handles incoming requests)

Servlet code in web.xml

<servlet>
		<servlet-name>flex</servlet-name>
		<servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
		<load-on-startup>1</load-on-startup>
</servlet>


<servlet-mapping>
		<servlet-name>flex</servlet-name>
		<url-pattern>/messagebroker/*</url-pattern>
</servlet-mapping>

There is already a GrailsDispatcherServlet (child of DispatcherServlet) by default, without an explicitly stated mapping, so I assume its defaulted somewhere in Grails:

<servlet>
		<servlet-name>grails</servlet-name>
		<servlet-class>org.codehaus.groovy.grails.web.servlet.GrailsDispatcherServlet</servlet-class>
		<load-on-startup>1</load-on-startup>
	</servlet>

From Flex client, I am able to call my exposed service on the server and receive an object back, but do get this exception on server side:

ERROR filter.UrlMappingsFilter  - Error when matching URL mapping [/(*)/(*)?/(*)?]:org.springframework.web.context.request.ServletRequestAttributes cannot be cast to org.codehaus.groovy.grails.web.servlet.mvc.GrailsWebRequest
java.lang.ClassCastException: org.springframework.web.context.request.ServletRequestAttributes cannot be cast to org.codehaus.groovy.grails.web.servlet.mvc.GrailsWebRequest
	at java.lang.Thread.run(Thread.java:619)

If I try and access from browser using usual URL http://localhost:8080/myAppRoot/ ... I receive an error 500 page with same kind of exception:

Error 500:
Servlet: default
URI: /myAppRoot/
Exception Message: org.springframework.web.context.request.ServletRequestAttributes cannot be cast to org.codehaus.groovy.grails.web.servlet.mvc.GrailsWebRequest
Caused by: org.springframework.web.context.request.ServletRequestAttributes cannot be cast to org.codehaus.groovy.grails.web.servlet.mvc.GrailsWebRequest
Class: Unknown
At Line: [-1]
Code Snippet:

Anyone have any idea how to clean this up to make both servlets play together nicely?

Thanks,

Larry