If I try to deploy the ActiveMQ JCA resource adapter (activemq-rar-4.1.0-incubator.rar) side by side with a Spring 2 war in JBoss 4.0.5 , I get the following error on server startup:

ERROR
[org.springframework.web.context.ContextLoader] Context initialization
failed
org.springframework.beans.factory.BeanDefinitionStoreException:
Unexpected exception parsing XML document from ServletContext resource
[/WEB-INF/applicationContext.xml]; nested exception is
java.lang.IllegalArgumentException: Class
[org.apache.xbean.spring.context.v2.XBeanNamespaceHandler] does not
implement the NamespaceHandler interface
Caused by:
java.lang.IllegalArgumentException: Class
[org.apache.xbean.spring.context.v2.XBeanNamespaceHandler] does not
implement the NamespaceHandler interface
at org.springframework.beans.factory.xml.DefaultNamespaceHandlerResolver.initHandle\
rMappings(DefaultNamespaceHandlerResolver.java:119)
at org.springframework.beans.factory.xml.DefaultNamespaceHandlerResolver.(Def\
aultNamespaceHandlerResolver.java:96)
at org.springframework.beans.factory.xml.DefaultNamespaceHandlerResolver.(Def\
aultNamespaceHandlerResolver.java:82)
at org.springframework.beans.factory.xml.XmlBeanDefinitionReader.createDefaultNames\
paceHandlerResolver(XmlBeanDefinitionReader.java:526)
at org.springframework.beans.factory.xml.XmlBeanDefinitionReader.createReaderContex\
t(XmlBeanDefinitionReader.java:515)
at org.springframework.beans.factory.xml.XmlBeanDefinitionReader.registerBeanDefini\
tions(XmlBeanDefinitionReader.java:495)
at org.springframework.beans.factory.xml.XmlBeanDefinitionReader.doLoadBeanDefiniti\
ons(XmlBeanDefinitionReader.java:390)
at org.springframework.beans.factory.xml.XmlBeanDefinitionReader.loadBeanDefinition\
s(XmlBeanDefinitionReader.java:340)
at org.springframework.beans.factory.xml.XmlBeanDefinitionReader.loadBeanDefinition\
s(XmlBeanDefinitionReader.java:317)
at org.springframework.beans.factory.support.AbstractBeanDefinitionReader.loadBeanD\
efinitions(AbstractBeanDefinitionReader.java:125)
at org.springframework.beans.factory.support.AbstractBeanDefinitionReader.loadBeanD\
efinitions(AbstractBeanDefinitionReader.java:141)
at org.springframework.web.context.support.XmlWebApplicationContext.loadBeanDefinit\
ions(XmlWebApplicationContext.java:123)
at org.springframework.web.context.support.XmlWebApplicationContext.loadBeanDefinit\
ions(XmlWebApplicationContext.java:91)
at org.springframework.context.support.AbstractRefreshableApplicationContext.refres\
hBeanFactory(AbstractRefreshableApplicationContext.java:94)
at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractA\
pplicationContext.java:292)
at org.springframework.web.context.support.AbstractRefreshableWebApplicationContext\
.refresh(AbstractRefreshableWebApplicationContext.java:156)
at org.springframework.web.context.ContextLoader.createWebApplicationContext(Contex\
tLoader.java:246)
at org.springframework.web.context.ContextLoader.initWebApplicationContext(ContextL\
oader.java:184)
at org.springframework.web.context.ContextLoaderListener.contextInitialized(Context\
LoaderListener.java:49)


The problem is reproducible with any Spring 2 app (like the jpetstore sample of Spring 2.0.2 distribution), not only mine, to try yourself these are the steps:
1)Install a fresh Jboss (I tested 4.0.3 and 4.0.5) and verify it starts without problems
2)Stop JBoss
3)Put the activemq-rar-4.1.0-incubator.rar and jpetstore.war in the deploy JBoss dir
4)Start JBoss and you will see my stack trace

The only workaround I found is to remove the Spring 2 jar from the ActiveMQ rar, but as I think is a classloader problem, there isn't a correct way of insulating JCA connector from apps?
I tryed also to put the activemq .rar inside an .ear file as described here
http://www.jboss.org/index.html?module=bb&op=viewtopic&p=3992480 but nothing changed. Luciano