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java.lang.NullPointerException: 	at mdb.HalloMDB.send(HalloMDB.java:99)	at mdb.HalloMDB.onMessage(HalloMDB.java:66)	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:597)	at org.glassfish.ejb.security.application.EJBSecurityManager.runMethod(EJBSecurityManager.java:1056)	at org.glassfish.ejb.security.application.EJBSecurityManager.invoke(EJBSecurityManager.java:1128)	at com.sun.ejb.containers.BaseContainer.invokeTargetBeanMethod(BaseContainer.java:4087)	at com.sun.ejb.containers.BaseContainer.__intercept(BaseContainer.java:5272)	at com.sun.ejb.containers.BaseContainer.intercept(BaseContainer.java:5252)	at com.sun.ejb.containers.MessageBeanContainer.deliverMessage(MessageBeanContainer.java:1086)	at com.sun.ejb.containers.MessageBeanListenerImpl.deliverMessage(MessageBeanListenerImpl.java:76)	at com.sun.enterprise.connectors.inbound.MessageEndpointInvocationHandler.invoke(MessageEndpointInvocationHandler.java:166)	at $Proxy122.onMessage(Unknown Source)	at com.sun.messaging.jms.ra.OnMessageRunner.run(OnMessageRunner.java:258)	at com.sun.enterprise.connectors.work.OneWork.doWork(OneWork.java:92)	at com.sun.corba.ee.impl.orbutil.threadpool.ThreadPoolImpl$WorkerThread.performWork(ThreadPoolImpl.java:492)	at com.sun.corba.ee.impl.orbutil.threadpool.ThreadPoolImpl$WorkerThread.run(ThreadPoolImpl.java:528)