Hello there! We've just upgraded from 4.0.1 -> 4.0.5 and we are getting an unusual errors here. It seems that 4.0.5 consider that everything is a XA tx, altough we do not use XA. We do have 2 different datasources, and yes we have places where some commit happens on both. We have a mix of entity + iBatis environment. One of the errors that appeared is : SET CHAINED command not allowed within multi-statement transaction." exception accessing Sybase. After a few google search I found out that this is because of XA transactions.
Also warnings like " WARN [org.jboss.resource.connectionmanager.TxConnectionManager] Prepare called on a local tx. Use of local transactions on a jta transaction with more than one branch may result in inconsistent data in some cases of failure." are being logged.

My question is, did Jboss changed the way it deals with transactions? by simply removing jboss-xa-jdbc.rar will it fix this issue?

Best regards