Hi Guys, In order to test the concurrency in my system, I created a Threaded standalone application and tried to invoke a Stateless Session Bean concurrently 100 times.
What the Session Bean does is fairly simple, It calls an entiry bean which in turn searches for the primary key in the database. If there is'nt one, it creates a new record. When I executed my threaded applicatoin, I got the following Exception stack trace. Can somebody explain be about this 'No ManagedConnections Available!'. Am I missing something in the way I have configured my datasource. My datasource configuration is : <datasources> <local-tx-datasource> <jndi-name>OracleDS</jndi-name> <connection-url>jdbc:oracle:thin:@193.16.18.142:1521:testdb</connection-url> <driver-class>oracle.jdbc.driver.OracleDriver</driver-class> <user-name>dev</user-name> <password>dev</password> <exception-sorter-class-name>org.jboss.resource.adapter.jdbc.vendor.OracleExceptionSorter</exception-sorter-class-name> </local-tx-datasource> </datasources> Environment: jboss-3.2.1_tomcat-4.1.24, Oracle 8.1.6, Jdk 1.4.1_01 Thanx in advance, Magesh EXCEPTION STACK: org.jboss.util.NestedSQLException: No ManagedConnections Available!; - nested throwable: (javax.resource.ResourceException: No ManagedConnections Available!) at org.jboss.resource.adapter.jdbc.WrapperDataSource.getConnection(WrapperDataSource.java:106) at com.pindartech.imageprocessing.manager.requestpersistencemanager.RequestBean.getConnection(RequestBean.java:690) at com.pindartech.imageprocessing.manager.requestpersistencemanager.RequestBean.ejbFindByPrimaryKey(RequestBean.java:460) at sun.reflect.GeneratedMethodAccessor521.invoke(Unknown Source) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25) at java.lang.reflect.Method.invoke(Method.java:324) at org.jboss.ejb.plugins.BMPPersistenceManager.callFinderMethod(BMPPersistenceManager.java:578) at org.jboss.ejb.plugins.BMPPersistenceManager.findEntity(BMPPersistenceManager.java:316) at org.jboss.resource.connectionmanager.CachedConnectionInterceptor.findEntity(CachedConnectionInterceptor.java:301) at org.jboss.ejb.EntityContainer.findLocal(EntityContainer.java:627) at sun.reflect.GeneratedMethodAccessor520.invoke(Unknown Source) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25) at java.lang.reflect.Method.invoke(Method.java:324) at org.jboss.ejb.EntityContainer$ContainerInterceptor.invokeHome(EntityContainer.java:998) at org.jboss.ejb.plugins.EntitySynchronizationInterceptor.invokeHome(EntitySynchronizationInterceptor.java:188) at org.jboss.resource.connectionmanager.CachedConnectionInterceptor.invokeHome(CachedConnectionInterceptor.java:215) at org.jboss.ejb.plugins.AbstractInterceptor.invokeHome(AbstractInterceptor.java:88) at org.jboss.ejb.plugins.EntityInstanceInterceptor.invokeHome(EntityInstanceInterceptor.java:91) at org.jboss.ejb.plugins.EntityLockInterceptor.invokeHome(EntityLockInterceptor.java:61) at org.jboss.ejb.plugins.EntityCreationInterceptor.invokeHome(EntityCreationInterceptor.java:28) at org.jboss.ejb.plugins.AbstractTxInterceptor.invokeNext(AbstractTxInterceptor.java:88) at org.jboss.ejb.plugins.TxInterceptorCMT.runWithTransactions(TxInterceptorCMT.java:243) at org.jboss.ejb.plugins.TxInterceptorCMT.invokeHome(TxInterceptorCMT.java:74) at org.jboss.ejb.plugins.SecurityInterceptor.invokeHome(SecurityInterceptor.java:92) at org.jboss.ejb.plugins.LogInterceptor.invokeHome(LogInterceptor.java:120) at org.jboss.ejb.plugins.ProxyFactoryFinderInterceptor.invokeHome(ProxyFactoryFinderInterceptor.java:93) at org.jboss.ejb.EntityContainer.internalInvokeHome(EntityContainer.java:477) at org.jboss.ejb.Container.invoke(Container.java:694) at org.jboss.ejb.plugins.local.BaseLocalProxyFactory.invokeHome(BaseLocalProxyFactory.java:272) at org.jboss.ejb.plugins.local.LocalHomeProxy.invoke(LocalHomeProxy.java:110) at $Proxy263.findByPrimaryKey(Unknown Source) at com.pindartech.imageprocessing.manager.requestpersistencemanager.RequestDBManager.findRequestByRequestID(RequestDBManager.java:53) at com.pindartech.imageprocessing.manager.requestpersistencemanager.RequestPersistenceManagerBean.findRequestByRequestID(RequestPersistenceManagerBean.java:98) at sun.reflect.GeneratedMethodAccessor544.invoke(Unknown Source) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25) at java.lang.reflect.Method.invoke(Method.java:324) at org.jboss.ejb.StatelessSessionContainer$ContainerInterceptor.invoke(StatelessSessionContainer.java:629) at org.jboss.resource.connectionmanager.CachedConnectionInterceptor.invoke(CachedConnectionInterceptor.java:186) at org.jboss.ejb.plugins.StatelessSessionInstanceInterceptor.invoke(StatelessSessionInstanceInterceptor.java:72) at org.jboss.ejb.plugins.AbstractTxInterceptor.invokeNext(AbstractTxInterceptor.java:84) at org.jboss.ejb.plugins.TxInterceptorCMT.runWithTransactions(TxInterceptorCMT.java:243) at org.jboss.ejb.plugins.TxInterceptorCMT.invoke(TxInterceptorCMT.java:104) at org.jboss.ejb.plugins.SecurityInterceptor.invoke(SecurityInterceptor.java:117) at org.jboss.ejb.plugins.LogInterceptor.invoke(LogInterceptor.java:191) at org.jboss.ejb.plugins.ProxyFactoryFinderInterceptor.invoke(ProxyFactoryFinderInterceptor.java:122) at org.jboss.ejb.StatelessSessionContainer.internalInvoke(StatelessSessionContainer.java:322) at org.jboss.ejb.Container.invoke(Container.java:674) at org.jboss.ejb.plugins.local.BaseLocalProxyFactory.invoke(BaseLocalProxyFactory.java:353) at org.jboss.ejb.plugins.local.StatelessSessionProxy.invoke(StatelessSessionProxy.java:83) at $Proxy295.findRequestByRequestID(Unknown Source) at com.pindartech.imageprocessing.manager.requestcontroller.RequestControllerBean.findRequestByRequestID(RequestControllerBean.java:387) at com.pindartech.imageprocessing.manager.requestcontroller.RequestControllerBean.processRequest(RequestControllerBean.java:67) at sun.reflect.GeneratedMethodAccessor542.invoke(Unknown Source) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25) at java.lang.reflect.Method.invoke(Method.java:324) at org.jboss.ejb.StatelessSessionContainer$ContainerInterceptor.invoke(StatelessSessionContainer.java:629) at org.jboss.resource.connectionmanager.CachedConnectionInterceptor.invoke(CachedConnectionInterceptor.java:186) at org.jboss.ejb.plugins.StatelessSessionInstanceInterceptor.invoke(StatelessSessionInstanceInterceptor.java:72) at org.jboss.ejb.plugins.AbstractTxInterceptor.invokeNext(AbstractTxInterceptor.java:84) at org.jboss.ejb.plugins.TxInterceptorCMT.runWithTransactions(TxInterceptorCMT.java:243) at org.jboss.ejb.plugins.TxInterceptorCMT.invoke(TxInterceptorCMT.java:104) at org.jboss.ejb.plugins.SecurityInterceptor.invoke(SecurityInterceptor.java:117) at org.jboss.ejb.plugins.LogInterceptor.invoke(LogInterceptor.java:191) at org.jboss.ejb.plugins.ProxyFactoryFinderInterceptor.invoke(ProxyFactoryFinderInterceptor.java:122) at org.jboss.ejb.StatelessSessionContainer.internalInvoke(StatelessSessionContainer.java:322) at org.jboss.ejb.Container.invoke(Container.java:674) at org.jboss.ejb.plugins.local.BaseLocalProxyFactory.invoke(BaseLocalProxyFactory.java:353) at org.jboss.ejb.plugins.local.StatelessSessionProxy.invoke(StatelessSessionProxy.java:83) at $Proxy294.processRequest(Unknown Source) at com.pindartech.imageprocessing.manager.requestreceiver.RequestReceiverBean.received(RequestReceiverBean.java:110) at sun.reflect.GeneratedMethodAccessor526.invoke(Unknown Source) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25) at java.lang.reflect.Method.invoke(Method.java:324) at org.jboss.ejb.StatelessSessionContainer$ContainerInterceptor.invoke(StatelessSessionContainer.java:629) at org.jboss.resource.connectionmanager.CachedConnectionInterceptor.invoke(CachedConnectionInterceptor.java:186) at org.jboss.ejb.plugins.StatelessSessionInstanceInterceptor.invoke(StatelessSessionInstanceInterceptor.java:72) at org.jboss.ejb.plugins.AbstractTxInterceptor.invokeNext(AbstractTxInterceptor.java:84) at org.jboss.ejb.plugins.TxInterceptorCMT.runWithTransactions(TxInterceptorCMT.java:296) at org.jboss.ejb.plugins.TxInterceptorCMT.invoke(TxInterceptorCMT.java:104) at org.jboss.ejb.plugins.SecurityInterceptor.invoke(SecurityInterceptor.java:117) at org.jboss.ejb.plugins.LogInterceptor.invoke(LogInterceptor.java:191) at org.jboss.ejb.plugins.ProxyFactoryFinderInterceptor.invoke(ProxyFactoryFinderInterceptor.java:122) at org.jboss.ejb.StatelessSessionContainer.internalInvoke(StatelessSessionContainer.java:322) at org.jboss.ejb.Container.invoke(Container.java:674) at sun.reflect.GeneratedMethodAccessor480.invoke(Unknown Source) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25) at java.lang.reflect.Method.invoke(Method.java:324) at org.jboss.mx.capability.ReflectedMBeanDispatcher.invoke(ReflectedMBeanDispatcher.java:284) at org.jboss.mx.server.MBeanServerImpl.invoke(MBeanServerImpl.java:549) at org.jboss.invocation.jrmp.server.JRMPInvoker.invoke(JRMPInvoker.java:359) at sun.reflect.GeneratedMethodAccessor112.invoke(Unknown Source) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25) at java.lang.reflect.Method.invoke(Method.java:324) at 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