Hi Fernando.

Messaging must be upgraded in EAP 5.1.1. AOP is updated in ER1 and there is included patch for JBAOP-796, one-off for Messaging 1.4.6 is JBPAPP-4956. In one off there are incorporated changes in both AOP and JBoss Messaging.

Changed messaging is not present in EAP 5.1.1.ER1, AOP is updated. Both components must be updated.
Fernando, please push Howard to fix open JIRAs in JBoss Mesaging a release new version.

I met this problem with JBossWS testsuise in part where JMS is used as transport layer. For details see [1].
Received error:
java.lang.NoSuchMethodError: org/jboss/aop/AspectManager.instance(Ljava/lang/Class;)Lorg/jboss/aop/AspectManager;
at org.jboss.jms.client.delegate.ClientConnectionFactoryDelegate.<clinit>(ClientConnectionFactoryDelegate.java)
at java.lang.J9VMInternals.initializeImpl(Native Method)
at java.lang.J9VMInternals.initialize(J9VMInternals.java:200)

EAP 5.1.0 [2]
<version.jboss.messaging>1.4.7.GA</version.jboss.messaging>
<version.org.jboss.aop>2.1.6.GA_CP01</version.org.jboss.aop>

EAP 5.1.1 [3]
<version.jboss.messaging>1.4.7.GA</version.jboss.messaging>
<version.org.jboss.aop>2.1.6.GA_CP02</version.org.jboss.aop>

[1] https://hudson.qa.jboss.com/hudson/view/EAP5-jbossws/job/eap51-jbossws-native-ibm/17/jdk=ibm16,label=RHEL4_x86_64/testReport/junit/org.jboss.test.ws.jaxws.samples.jmstransport/JMSTransportTestCase/testJMSEndpointPort/
[2] http://anonsvn.jboss.org/repos/jbossas/tags/JBPAPP_5_1_0_Final/component-matrix/pom.xml
[3] http://anonsvn.jboss.org/repos/jbossas/tags/JBPAPP_5_1_1_ER1/component-matrix/pom.xml