我正在尝试在Weblogic 8.1中部署一个应用程序，该应用程序将从队列中读取消息，执行逻辑并将答复放入另一个队列中。启动Weblogic时出现以下异常：
<BEA-010065> <MessageDrivenBean threw an Exception in onMessage(). The exception was:
java.lang.NoClassDefFoundError.
java.lang.NoClassDefFoundError
at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:39)
at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:27)
at java.lang.reflect.Constructor.newInstance(Constructor.java:501)
at java.lang.Class.newInstance0(Class.java:354)
at java.lang.Class.newInstance(Class.java:307)
at weblogic.ejb.container.manager.BaseEJBManager.allocateBean(BaseEJBManager.java:197)
at weblogic.ejb.container.manager.MessageDrivenManager.createBean(MessageDrivenManager.java:279)
at weblogic.ejb.container.pool.MessageDrivenPool.createBean(MessageDrivenPool.java:165)
at weblogic.ejb.container.pool.MessageDrivenPool.getBean(MessageDrivenPool.java:90)
at weblogic.ejb.container.internal.MDListener.execute(MDListener.java:393)
at weblogic.ejb.container.internal.MDListener.transactionalOnMessage(MDListener.java:335)
at weblogic.ejb.container.internal.MDListener.onMessage(MDListener.java:291)
at weblogic.jms.client.JMSSession.onMessage(JMSSession.java:4060)
at weblogic.jms.client.JMSSession.execute(JMSSession.java:3953)
at weblogic.jms.client.JMSSession$UseForRunnable.run(JMSSession.java:4467)
at weblogic.work.ServerWorkManagerImpl$WorkAdapterImpl.run(ServerWorkManagerImpl.java:518)
at weblogic.work.ExecuteThread.execute(ExecuteThread.java:209)
at weblogic.work.ExecuteThread.run(ExecuteThre
ad.java:181)
任何人都可以指导我如何解决此异常或引起异常的原因吗？