client access to ActiveMQ from Weblogic EAR with embedded ActiveMQ client jars

[jbyrne <jo...@nl.ibm.com>]

We have a number of applications on an application server (Weblogic 11g) and
some of these have MDB's which need to use an additional JMS provider
provided by a remote ActiveMQ v5.9.0. This works fine by populating the JNDI
and adding the ActiveMQ client jars ( activemq-client-5.9.0.jar,
hawtbuf-1.9.jar , osgi.core-4.3.0.jar , slf4j-api-1.7.5.jar ,
slf4j-log4j12-1.7.5.jar, log4j-1.2.17.jar) to JVM classpath.
As the applications use log4j, we needed to alter the class-loading order
(for log4j) to use the application-supplied configuration - rather than the
jars from the JVM classpath. Otherwise some applications were logging to the
wrong location. 
This 'solution' is not ideal as it requires also redefining the (log4j)
class-loading order for applications not impacted by the change in
JMS-provider.

Rather than updating the JVM classpath, we have attempted to include the 6
ActiveMQ jars in each application (EAR's lib folder). However this results
in errors accessing the remote ActiveMQ destinations. ( In Weblogic terms,
the JMS Connection factory and destinations are defined in a Foreign Server
- which also includes the mapping of ActiveMQ JNDI names to queues).
The However this solution does not work as expected. It results in a
'ClassNotFound' i.e.
	javax.naming.NoInitialContextException: Cannot instantiate class:
org.apache.activemq.jndi.ActiveMQInitialContextFactory [Root exception is
java.lang.ClassNotFoundException:

From analysis of classloading (via jconsole) it would seem that the above
class is loaded ("org/apache/activemq/jndi/ActiveMQInitialContextFactory
success (13.11 ms)"  -  but access to some dependency (JNDI?)  fails.

A more complete stack-trace contains:
javax.naming.NoInitialContextException: Cannot instantiate class:
org.apache.activemq.jndi.ActiveMQInitialContextFactory [Root exception is
java.lang.ClassNotFoundException:
org.apache.activemq.jndi.ActiveMQInitialContextFactory]
        at
javax.naming.spi.NamingManager.getInitialContext(NamingManager.java:657)
        at
javax.naming.InitialContext.getDefaultInitCtx(InitialContext.java:288)
        at javax.naming.InitialContext.init(InitialContext.java:223)
        at javax.naming.InitialContext.<init>(InitialContext.java:197)
        at
weblogic.deployment.jms.ForeignOpaqueReference.getReferent(ForeignOpaqueReference.java:182)

Adding a jndi.properties file to a jar in the application has not helped. 
(We also cannot use the Weblogic-supplied 'Messaging-Bridge').

In summary, moving the ActiveMQ jars from the JVM classpath into the EARs
has not resulted in the required results.

Perhaps someone has succeeded in getting a similar setup working (on
Weblogic 11g).
Any help would be greatly appreciated.




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