如果在JBoss中同时使用俩个数据源就会发生如下异常：
Transaction is not active: tx=TransactionImple < ac, BasicAction: -3f57fe8b:f52:4cd284ca:9b status: ActionStatus.ABORT_ONLY >; - nested throwable: (javax.resource.ResourceException: Transaction is not active: tx=TransactionImple < ac, BasicAction: -3f57fe8b:f52:4cd284ca:9b status: ActionStatus.ABORT_ONLY >)
Adding multiple last resources is disallowed. Current resource is org.jboss.resource.connectionmanager.TxConnectionManager$LocalXAResource@5cb57c
解决方法：
JBoss5 在conf/jbossts-properties.xml文件里，在<properties depends="arjuna" name="jta">节点下增加
<property name="com.arjuna.ats.jta.allowMultipleLastResources" value="true"/>属性。
注：Jboss4 在conf/jbossjta-properties.xml文件里。