Hi- I've just created my first MDB in JBoss 5.0 Beta 4 using Java 1.5. When I start Jboss, I see the following error: 12:14:37,375 INFO [EJBContainer] STARTED EJB: cmpe275.ejb.SensorDataMDB ejbName: SensorDataMDB 12:14:37,406 ERROR [AbstractKernelController] Error installing to Start: name=jboss.j2ee:jar=cmpe275-prj3-ejb.jar,name=SensorDataMDB,service=EJB3 state=Create org.jboss.deployment.DeploymentException: Unable to create activation spec ra=jboss.jca:service=RARDeployment,name='jms-ra.rar' messaging-type=javax.jms.MessageListener properties={destination=org.jboss.metadata.ejb.spec.ActivationConfigPropertyMetaData@aac6440e{destination}, destinationType=org.jboss.metadata.ejb.spec.ActivationConfigPropertyMetaData@96f19068{destinationType}, subscriptionDurability=org.jboss.metadata.ejb.spec.ActivationConfigPropertyMetaData@2263d106{subscriptionDurability}} at org.jboss.deployment.DeploymentException.rethrowAsDeploymentException(DeploymentException.java:52) at org.jboss.ejb3.mdb.inflow.JBossMessageEndpointFactory.createActivationSpec(JBossMessageEndpointFactory.java:299) at org.jboss.ejb3.mdb.inflow.JBossMessageEndpointFactory.start(JBossMessageEndpointFactory.java:192) at org.jboss.ejb3.mdb.MessagingContainer.startProxies(MessagingContainer.java:187) at org.jboss.ejb3.mdb.MessagingContainer.start(MessagingContainer.java:151) at org.jboss.ejb3.mdb.MDB.start(MDB.java:123) at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:64) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) at java.lang.reflect.Method.invoke(Method.java:615) at org.jboss.reflect.plugins.introspection.ReflectionUtils.invoke(ReflectionUtils.java:56) at org.jboss.reflect.plugins.introspection.ReflectMethodInfoImpl.invoke(ReflectMethodInfoImpl.java:110) at org.jboss.joinpoint.plugins.BasicMethodJoinPoint.dispatch(BasicMethodJoinPoint.java:66) at org.jboss.kernel.plugins.dependency.KernelControllerContextAction$JoinpointDispatchWrapper.execute(KernelControllerContextAction.java:214) at org.jboss.kernel.plugins.dependency.ExecutionWrapper.execute(ExecutionWrapper.java:45) at org.jboss.kernel.plugins.dependency.KernelControllerContextAction.dispatchExecutionWrapper(KernelControllerContextAction.java:108) at org.jboss.kernel.plugins.dependency.KernelControllerContextAction.dispatchJoinPoint(KernelControllerContextAction.java:69) at org.jboss.kernel.plugins.dependency.LifecycleAction.installActionInternal(LifecycleAction.java:221) at org.jboss.kernel.plugins.dependency.KernelControllerContextAction.installAction(KernelControllerContextAction.java:135) at org.jboss.kernel.plugins.dependency.KernelControllerContextAction.installAction(KernelControllerContextAction.java:46) at org.jboss.dependency.plugins.action.SimpleControllerContextAction.simpleInstallAction(SimpleControllerContextAction.java:62) at org.jboss.dependency.plugins.action.AccessControllerContextAction.install(AccessControllerContextAction.java:71) at org.jboss.dependency.plugins.AbstractControllerContextActions.install(AbstractControllerContextActions.java:51) at org.jboss.dependency.plugins.AbstractControllerContext.install(AbstractControllerContext.java:327) at org.jboss.dependency.plugins.AbstractController.install(AbstractController.java:1309) at org.jboss.dependency.plugins.AbstractController.incrementState(AbstractController.java:734) at org.jboss.dependency.plugins.AbstractController.resolveContexts(AbstractController.java:862) at org.jboss.dependency.plugins.AbstractController.resolveContexts(AbstractController.java:784) at org.jboss.dependency.plugins.AbstractController.change(AbstractController.java:622) at org.jboss.dependency.plugins.AbstractController.change(AbstractController.java:411) at org.jboss.system.ServiceController.doChange(ServiceController.java:659) at org.jboss.system.ServiceController.start(ServiceController.java:431) at org.jboss.system.deployers.ServiceDeployer.start(ServiceDeployer.java:150) at org.jboss.system.deployers.ServiceDeployer.deploy(ServiceDeployer.java:108) at org.jboss.system.deployers.ServiceDeployer.deploy(ServiceDeployer.java:46) at org.jboss.deployers.spi.deployer.helpers.AbstractSimpleRealDeployer.internalDeploy(AbstractSimpleRealDeployer.java:65) at org.jboss.deployers.spi.deployer.helpers.AbstractRealDeployer.deploy(AbstractRealDeployer.java:50) at org.jboss.deployers.plugins.deployers.DeployerWrapper.deploy(DeployerWrapper.java:169) at org.jboss.deployers.plugins.deployers.DeployersImpl.doInstallParentFirst(DeployersImpl.java:853) at org.jboss.deployers.plugins.deployers.DeployersImpl.doInstallParentFirst(DeployersImpl.java:874) at org.jboss.deployers.plugins.deployers.DeployersImpl.install(DeployersImpl.java:794) at org.jboss.dependency.plugins.AbstractControllerContext.install(AbstractControllerContext.java:327) at org.jboss.dependency.plugins.AbstractController.install(AbstractController.java:1309) at org.jboss.dependency.plugins.AbstractController.incrementState(AbstractController.java:734) at org.jboss.dependency.plugins.AbstractController.resolveContexts(AbstractController.java:862) at org.jboss.dependency.plugins.AbstractController.resolveContexts(AbstractController.java:784) at org.jboss.dependency.plugins.AbstractController.change(AbstractController.java:622) at org.jboss.dependency.plugins.AbstractController.change(AbstractController.java:411) at org.jboss.deployers.plugins.deployers.DeployersImpl.process(DeployersImpl.java:498) at org.jboss.deployers.plugins.main.MainDeployerImpl.process(MainDeployerImpl.java:506) at org.jboss.system.server.profileservice.ProfileServiceBootstrap.loadProfile(ProfileServiceBootstrap.java:246) at org.jboss.system.server.profileservice.ProfileServiceBootstrap.start(ProfileServiceBootstrap.java:131) at org.jboss.bootstrap.AbstractServerImpl.start(AbstractServerImpl.java:408) at org.jboss.Main.boot(Main.java:208) at org.jboss.Main$1.run(Main.java:534) at java.lang.Thread.run(Thread.java:803) Caused by: javax.management.InstanceNotFoundException: jboss.jca:service=RARDeployment,name='jms-ra.rar' is not registered. at org.jboss.mx.server.registry.BasicMBeanRegistry.get(BasicMBeanRegistry.java:529) at org.jboss.mx.server.MBeanServerImpl.invoke(MBeanServerImpl.java:662) at org.jboss.ejb3.JmxClientKernelAbstraction.invoke(JmxClientKernelAbstraction.java:44) at org.jboss.ejb3.mdb.inflow.JBossMessageEndpointFactory.createActivationSpec(JBossMessageEndpointFactory.java:294) ... 54 more Here's the class definition: import javax.jms.Message; import javax.jms.MessageListener; import org.jboss.logging.Logger; import javax.ejb.MessageDriven; import javax.ejb.ActivationConfigProperty; @MessageDriven(activationConfig = { @ActivationConfigProperty(propertyName="destinationType", propertyValue="javax.jms.Topic"), @ActivationConfigProperty(propertyName="destination", propertyValue="topic/SensorData") }) // topic is under java:comp/env/ public class SensorDataMDB implements MessageListener { private static Logger logger = Logger.getLogger(SensorDataMDB.class); public SensorDataMDB() { } public void onMessage(Message arg0) { // TODO Auto-generated method stub } } Any help would be greatly appreciated!! 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