Similar Issue Using DAO in MDB processing[dao connection pool different than jms connection pool]: MDBs receive some messages initially and then stop receiving messages from JMS. And after some time there is application deadlock when the MDB that are processing message attempts to acquire DB connection through the DAO layer. org.jboss.util.NestedSQLException: Transaction is not active: tx=TransactionImpl:XidImpl[FormatId=257, GlobalId=Contentuat2/177580, BranchQual=, localId=177580]; - nested throwable: (javax.resource.ResourceException: Transaction is not active: tx=TransactionImpl:XidImpl[FormatId=257, GlobalId=Contentuat2/177580, BranchQual=, localId=177580]) at org.jboss.resource.adapter.jdbc.WrapperDataSource.getConnection(WrapperDataSource.java:79) at com.fxcd.dao.impl.oracle.BaseOracleDaoImpl.getTxConnection(Unknown Source) at com.fxcd.dao.impl.oracle.RepositoryDocumentDaoImpl.updateMessageForQueuedDocument(Unknown Source) at com.fxcd.service.RepositoryServiceEJB.updateMessageForQueuedDocument(Unknown Source) at sun.reflect.GeneratedMethodAccessor218.invoke(Unknown Source) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25) at java.lang.reflect.Method.invoke(Method.java:324) at org.jboss.invocation.Invocation.performCall(Invocation.java:345) at org.jboss.ejb.StatelessSessionContainer$ContainerInterceptor.invoke(StatelessSessionContainer.java:214) at org.jboss.resource.connectionmanager.CachedConnectionInterceptor.invoke(CachedConnectionInterceptor.java:149) at org.jboss.ejb.plugins.StatelessSessionInstanceInterceptor.invoke(StatelessSessionInstanceInterceptor.java:154) at org.jboss.ejb.plugins.AbstractTxInterceptor.invokeNext(AbstractTxInterceptor.java:106) at org.jboss.ejb.plugins.TxInterceptorCMT.runWithTransactions(TxInterceptorCMT.java:363) at org.jboss.ejb.plugins.TxInterceptorCMT.invoke(TxInterceptorCMT.java:166) at org.jboss.ejb.plugins.SecurityInterceptor.invoke(SecurityInterceptor.java:153) at org.jboss.ejb.plugins.LogInterceptor.invoke(LogInterceptor.java:192) at org.jboss.ejb.plugins.CleanShutdownInterceptor.invoke(CleanShutdownInterceptor.java:264) at org.jboss.ejb.plugins.ProxyFactoryFinderInterceptor.invoke(ProxyFactoryFinderInterceptor.java:122) at org.jboss.ejb.SessionContainer.internalInvoke(SessionContainer.java:624) at org.jboss.ejb.Container.invoke(Container.java:873) at org.jboss.ejb.plugins.local.BaseLocalProxyFactory.invoke(BaseLocalProxyFactory.java:415) at org.jboss.ejb.plugins.local.StatelessSessionProxy.invoke(StatelessSessionProxy.java:88) at $Proxy301.updateMessageForQueuedDocument(Unknown Source) at com.fxcd.mdb.RepositoryServiceMDB.onMessage(Unknown Source) at sun.reflect.GeneratedMethodAccessor183.invoke(Unknown Source) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25) at java.lang.reflect.Method.invoke(Method.java:324) at org.jboss.invocation.Invocation.performCall(Invocation.java:345) at org.jboss.ejb.MessageDrivenContainer$ContainerInterceptor.invoke(MessageDrivenContainer.java:475) at org.jboss.resource.connectionmanager.CachedConnectionInterceptor.invoke(CachedConnectionInterceptor.java:149) at org.jboss.ejb.plugins.MessageDrivenInstanceInterceptor.invoke(MessageDrivenInstanceInterceptor.java:101) at org.jboss.ejb.plugins.CallValidationInterceptor.invoke(CallValidationInterceptor.java:48) at org.jboss.ejb.plugins.AbstractTxInterceptor.invokeNext(AbstractTxInterceptor.java:106) at org.jboss.ejb.plugins.TxInterceptorCMT.runWithTransactions(TxInterceptorCMT.java:335) at org.jboss.ejb.plugins.TxInterceptorCMT.invoke(TxInterceptorCMT.java:166) at org.jboss.ejb.plugins.RunAsSecurityInterceptor.invoke(RunAsSecurityInterceptor.java:94) at org.jboss.ejb.plugins.LogInterceptor.invoke(LogInterceptor.java:192) at org.jboss.ejb.plugins.ProxyFactoryFinderInterceptor.invoke(ProxyFactoryFinderInterceptor.java:122) at org.jboss.ejb.MessageDrivenContainer.internalInvoke(MessageDrivenContainer.java:389) at org.jboss.ejb.Container.invoke(Container.java:873) at org.jboss.ejb.plugins.jms.JMSContainerInvoker.invoke(JMSContainerInvoker.java:1077) at org.jboss.ejb.plugins.jms.JMSContainerInvoker$MessageListenerImpl.onMessage(JMSContainerInvoker.java:1379) at org.jboss.jms.asf.StdServerSession.onMessage(StdServerSession.java:256) at org.jboss.mq.SpyMessageConsumer.sessionConsumerProcessMessage(SpyMessageConsumer.java:904) at org.jboss.mq.SpyMessageConsumer.addMessage(SpyMessageConsumer.java:160) at org.jboss.mq.SpySession.run(SpySession.java:333) at org.jboss.jms.asf.StdServerSession.run(StdServerSession.java:180) at EDU.oswego.cs.dl.util.concurrent.PooledExecutor$Worker.run(PooledExecutor.java:743) at java.lang.Thread.run(Thread.java:534) Caused by: javax.resource.ResourceException: Transaction is not active: tx=TransactionImpl:XidImpl[FormatId=257, GlobalId=Contentuat2/177580, BranchQual=, localId=177580] at org.jboss.resource.connectionmanager.TxConnectionManager.getManagedConnection(TxConnectionManager.java:331) at org.jboss.resource.connectionmanager.BaseConnectionManager2.allocateConnection(BaseConnectionManager2.java:462) at org.jboss.resource.connectionmanager.BaseConnectionManager2$ConnectionManagerProxy.allocateConnection(BaseConnectionManager2.java:894) at org.jboss.resource.adapter.jdbc.WrapperDataSource.getConnection(WrapperDataSource.java:73) -------------------------- DAO Datasource configuration ---------------------------- JBoss 4.0.3 JMS (Singleton across 2 cluster nodes) Sun X2100 Dual core Oracle 9i <no-tx-datasource> <jndi-name>dao-datasource</jndi-name> <connection-url&gt;@oracle.database.dburl(a)&lt;/connection-url&gt; <driver-class>oracle.jdbc.driver.OracleDriver</driver-class> <user-name&gt;@oracle.database.username(a)&lt;/user-name&gt; @oracle.database.password@ <max-pool-size>100</max-pool-size> <blocking-timeout-millis>50000</blocking-timeout-millis> <valid-connection-checker-class-name> org.jboss.resource.adapter.jdbc.vendor.OracleValidConnectionChecker </valid-connection-checker-class-name> <exception-sorter-class-name>org.jboss.resource.adapter.jdbc.vendor.OracleExceptionSorter</exception-sorter-class-name> <track-statements>false</track-statements> </no-tx-datasource> View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4130418#... 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