Just chipping in that: http://blog.wombatsoftware.de/2012/12/jboss-7-two-databases-and-single.html and JBoss AS 7.1.0.Beta1 - ARJUNA12140: Adding multiple last resources is disallowed are different to what you are seeing, they are to do with enlisting none-XA datasources in a transaction.
+1 to scotts reference here: JBoss AS 7.1.0.Beta1 - ARJUNA12140: Adding multiple last resources is disallowed If it is the case, it makes you wonder if there is someway to force JCA to use a new XA connection for the different datasources?
Scott:
I have had similar issues (jca cannot enlist one of the datasource connection) in Wildfly 8.0.0.Final. I hope you can take a look to see you can help me.
This is the thread I opened for my issue. Stephen Coy thinks you may be able to figure it out for me. Thanks.