The first error is an XA exception throws from the XAResource during the 2PC protocol | org.jboss.tm.TransactionImpl$Resource.startResource() line: 2063 | org.jboss.tm.TransactionImpl.enlistResource(javax.transaction.xa.XAResource) line: 581 | org.jboss.resource.connectionmanager.TxConnectionManager$TxConnectionEventListener$TransactionSynch | ronization.enlist() line: 757 | XA errors are outside the purview of the sorter as this is not a connection based issue but rather an XA issue. XA exceptions are evaluated in the limited case that certain XA error codes prohibit a connection from being returned to the pool, but that's about it. This is why you are seeing the difference. View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4034096#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...