I have been using AS 4.0.4.GA for a while and never seen the following warning.
I updated the JBossCache lately from 1.4.0GA to 1.4.0.SP1, that is the only thing that I can thing of at the moment that could be related.
I am not sure if this is the cause or if this is the correct place to ask (JCA, JBossCache, or TX?). At first shoot, I didn't realy find any usefull info in the forum or doc's, so please feel free to point me to the correct starting point.
[JBossManagedConnectionPool] Destroying connection that could not be successfully matched: org.jboss.resource.connectionmanager.TxConnectionManager$TxConnectionEventListener@16998b9[state=NORMAL mc=org.jboss.resource.adapter.jdbc.local.LocalManagedConnection@92e1b2 handles=0 lastUse=1158079794828 permit=false trackByTx=false mcp=org.jboss.resource.connectionmanager.JBossManagedConnectionPool$OnePool@1fa4f8d context=org.jboss.resource.connectionmanager.InternalManagedConnectionPool@7cb926 xaResource=org.jboss.resource.connectionmanager.TxConnectionManager$LocalXAResource@11fa7e2 txSync=null]