为什么每次在SHUTDOWN JBOSS时总会出现异常

为什么每次在SHUTDOWN JBOSS时总会出现下面的警告信息，但是对EJB没有影响。

2008-04-24 15:09:51,031 WARN [org.jboss.ejb3.Ejb3Module] Stopping failed jboss.j2ee:service=EJB3,module=notused.jar
javax.naming.NameNotFoundException: manager1 not bound
at org.jnp.server.NamingServer.getBinding(NamingServer.java:514)
at org.jnp.server.NamingServer.getBinding(NamingServer.java:522)
at org.jnp.server.NamingServer.unbind(NamingServer.java:227)
at org.jnp.server.NamingServer.unbind(NamingServer.java:200)
at org.jnp.interfaces.NamingContext.unbind(NamingContext.java:737)
at org.jboss.util.naming.Util.unbind(Util.java:129)
at org.jboss.util.naming.Util.unbind(Util.java:120)
at org.jboss.ejb3.NonSerializableFactory.unbind(NonSerializableFactory.java:47)
at org.jboss.ejb3.Ejb3Deployment.stop(Ejb3Deployment.java:556)
at org.jboss.ejb3.Ejb3JmxDeployment.stop(Ejb3JmxDeployment.java:294)
at org.jboss.ejb3.Ejb3Module.stopService(Ejb3Module.java:46)
at org.jboss.system.ServiceMBeanSupport.jbossInternalStop(ServiceMBeanSupport.java:300)
at org.jboss.system.ServiceMBeanSupport.jbossInternalLifecycle(ServiceMBeanSupport.java:232)
at sun.reflect.GeneratedMethodAccessor4.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:585)
at org.jboss.mx.interceptor.ReflectedDispatcher.invoke(ReflectedDispatcher.java:141)
at org.jboss.mx.server.Invocation.dispatch(Invocation.java:80)
at org.jboss.mx.server.Invocation.invoke(Invocation.java:72)
at org.jboss.mx.server.AbstractMBeanInvoker.invoke(AbstractMBeanInvoker.java:245)
at org.jboss.mx.server.MBeanServerImpl.invoke(MBeanServerImpl.java:644)
at org.jboss.system.ServiceController$ServiceProxy.invoke(ServiceController.java:943)
at $Proxy0.stop(Unknown Source)
at org.jboss.system.ServiceController.stop(ServiceController.java:519)
at sun.reflect.GeneratedMethodAccessor142.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:585)
at org.jboss.mx.interceptor.ReflectedDispatcher.invoke(ReflectedDispatcher.java:141)
at org.jboss.mx.server.Invocation.dispatch(Invocation.java:80)
at org.jboss.mx.server.Invocation.invoke(Invocation.java:72)
at org.jboss.mx.server.AbstractMBeanInvoker.invoke(AbstractMBeanInvoker.java:245)
at org.jboss.mx.server.MBeanServerImpl.invoke(MBeanServerImpl.java:644)
at org.jboss.mx.util.MBeanProxyExt.invoke(MBeanProxyExt.java:176)
at $Proxy10.stop(Unknown Source)
at org.jboss.ejb3.EJB3Deployer.stop(EJB3Deployer.java:248)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:585)
at org.jboss.mx.interceptor.ReflectedDispatcher.invoke(ReflectedDispatcher.java:141)
at org.jboss.mx.server.Invocation.dispatch(Invocation.java:80)
at org.jboss.mx.server.Invocation.invoke(Invocation.java:72)
at org.jboss.mx.server.AbstractMBeanInvoker.invoke(AbstractMBeanInvoker.java:245)
at org.jboss.mx.server.MBeanServerImpl.invoke(MBeanServerImpl.java:644)
at org.jboss.mx.util.MBeanProxyExt.invoke(MBeanProxyExt.java:176)
at $Proxy11.stop(Unknown Source)
at org.jboss.deployment.MainDeployer.stop(MainDeployer.java:640)
at org.jboss.deployment.MainDeployer.undeploy(MainDeployer.java:613)
at org.jboss.deployment.MainDeployer.shutdown(MainDeployer.java:500)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:585)
at org.jboss.mx.interceptor.ReflectedDispatcher.invoke(ReflectedDispatcher.java:141)
at org.jboss.mx.server.Invocation.dispatch(Invocation.java:80)
at org.jboss.mx.interceptor.AbstractInterceptor.invoke(AbstractInterceptor.java:118)
at org.jboss.mx.server.Invocation.invoke(Invocation.java:74)
at org.jboss.mx.interceptor.ModelMBeanOperationInterceptor.invoke(ModelMBeanOperationInterceptor.java:127)
at org.jboss.mx.server.Invocation.invoke(Invocation.java:74)
at org.jboss.mx.server.AbstractMBeanInvoker.invoke(AbstractMBeanInvoker.java:245)
at org.jboss.mx.server.MBeanServerImpl.invoke(MBeanServerImpl.java:644)
at org.jboss.system.server.ServerImpl$ShutdownHook.shutdownDeployments(ServerImpl.java:988)
at org.jboss.system.server.ServerImpl$ShutdownHook.shutdown(ServerImpl.java:963)
at org.jboss.system.server.ServerImpl$ShutdownHook.run(ServerImpl.java:941)