[jboss-user] [EJB 3.0] - what happen with my entity bean , need expert help

I just a new learner for EJB3.0.I download the jboss-EJB-3.0_Preview_2 for testing ,and the session bean is ok,but when I run the entity bean ,the fatal error occurs .That seems like lots of mess .My environment is Jboss4.2.0GA. The exception just as follow. [java] Exception in thread "main" javax.ejb.EJBException: java.lang.NullPoi nterException [java] at org.jboss.ejb3.tx.Ejb3TxPolicy.handleExceptionInOurTx(Ejb3TxP olicy.java:63) [java] at org.jboss.aspects.tx.TxPolicy.invokeInOurTx(TxPolicy.java:83) [java] at org.jboss.aspects.tx.TxInterceptor$Required.invoke(TxIntercep tor.java:191) [java] at org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInv ocation.java:101) [java] at org.jboss.aspects.tx.TxPropagationInterceptor.invoke(TxPropag ationInterceptor.java:76) [java] at org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInv ocation.java:101) [java] at org.jboss.ejb3.stateful.StatefulInstanceInterceptor.invoke(St atefulInstanceInterceptor.java:83) [java] at org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInv ocation.java:101) [java] at org.jboss.aspects.security.AuthenticationInterceptor.invoke(A uthenticationInterceptor.java:77) [java] at org.jboss.ejb3.security.Ejb3AuthenticationInterceptor.invoke( Ejb3AuthenticationInterceptor.java:106) [java] at org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInv ocation.java:101) [java] at org.jboss.ejb3.ENCPropagationInterceptor.invoke(ENCPropagatio nInterceptor.java:46) [java] at org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInv ocation.java:101) [java] at org.jboss.ejb3.asynchronous.AsynchronousInterceptor.invoke(As ynchronousInterceptor.java:106) [java] at org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInv ocation.java:101) [java] at org.jboss.ejb3.stateful.StatefulContainer.dynamicInvoke(State fulContainer.java:333) [java] at org.jboss.aop.Dispatcher.invoke(Dispatcher.java:106) [java] at org.jboss.aspects.remoting.AOPRemotingInvocationHandler.invok e(AOPRemotingInvocationHandler.java:82) [java] at org.jboss.remoting.ServerInvoker.invoke(ServerInvoker.java:73 4) [java] at org.jboss.remoting.transport.socket.ServerThread.processInvoc ation(ServerThread.java:560) [java] at org.jboss.remoting.transport.socket.ServerThread.dorun(Server Thread.java:369) [java] at org.jboss.remoting.transport.socket.ServerThread.run(ServerTh read.java:165) [java] at org.jboss.remoting.MicroRemoteClientInvoker.invoke(MicroRemot eClientInvoker.java:163) [java] at org.jboss.remoting.Client.invoke(Client.java:1550) [java] at org.jboss.remoting.Client.invoke(Client.java:530) [java] at org.jboss.aspects.remoting.InvokeRemoteInterceptor.invoke(Inv okeRemoteInterceptor.java:62) [java] at org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInv ocation.java:101) [java] at org.jboss.aspects.tx.ClientTxPropagationInterceptor.invoke(Cl ientTxPropagationInterceptor.java:61) [java] at org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInv ocation.java:101) [java] at org.jboss.aspects.security.SecurityClientInterceptor.invoke(S ecurityClientInterceptor.java:53) [java] at org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInv ocation.java:101) [java] at org.jboss.ejb3.remoting.IsLocalInterceptor.invoke(IsLocalInte rceptor.java:72) [java] at org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInv ocation.java:101) [java] at org.jboss.ejb3.stateful.StatefulRemoteProxy.invoke(StatefulRe moteProxy.java:135) [java] at $Proxy1.checkout(Unknown Source) [java] at org.jboss.tutorial.entity.client.Client.main(Client.java:44) [java] at org.jboss.aspects.remoting.InvokeRemoteInterceptor.invoke(Inv okeRemoteInterceptor.java:74) [java] at org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInv ocation.java:101) [java] at org.jboss.aspects.tx.ClientTxPropagationInterceptor.invoke(Cl ientTxPropagationInterceptor.java:61) [java] at org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInv ocation.java:101) [java] at org.jboss.aspects.security.SecurityClientInterceptor.invoke(S ecurityClientInterceptor.java:53) [java] at org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInv ocation.java:101) [java] at org.jboss.ejb3.remoting.IsLocalInterceptor.invoke(IsLocalInte rceptor.java:72) [java] at org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInv ocation.java:101) [java] at org.jboss.ejb3.stateful.StatefulRemoteProxy.invoke(StatefulRe moteProxy.java:135) [java] at $Proxy1.checkout(Unknown Source) [java] at org.jboss.tutorial.entity.client.Client.main(Client.java:44) [java] Caused by: java.lang.NullPointerException [java] at org.jboss.tutorial.entity.bean.ShoppingCartBean.checkout(Shop pingCartBean.java:36) [java] at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) [java] at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAcces sorImpl.java:39) [java] at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMet hodAccessorImpl.java:25) [java] at java.lang.reflect.Method.invoke(Method.java:585) [java] at org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInv ocation.java:112) [java] at org.jboss.ejb3.interceptor.InvocationContextImpl.proceed(Invo cationContextImpl.java:166) [java] at org.jboss.ejb3.interceptor.EJB3InterceptorsInterceptor.invoke (EJB3InterceptorsInterceptor.java:63) [java] at org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInv ocation.java:101) [java] at org.jboss.ejb3.entity.ExtendedPersistenceContextPropagationIn terceptor.invoke(ExtendedPersistenceContextPropagationInterceptor.java:57) [java] at org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInv ocation.java:101) [java] at org.jboss.ejb3.entity.TransactionScopedEntityManagerIntercept or.invoke(TransactionScopedEntityManagerInterceptor.java:54) [java] at org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInv ocation.java:101) [java] at org.jboss.ejb3.AllowedOperationsInterceptor.invoke(AllowedOpe rationsInterceptor.java:47) [java] at org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInv ocation.java:101) [java] at org.jboss.aspects.tx.TxPolicy.invokeInOurTx(TxPolicy.java:79) [java] at org.jboss.aspects.tx.TxInterceptor$Required.invoke(TxIntercep tor.java:191) [java] at org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInv ocation.java:101) [java] at org.jboss.aspects.tx.TxPropagationInterceptor.invoke(TxPropag ationInterceptor.java:76) [java] at org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInv ocation.java:101) [java] at org.jboss.ejb3.stateful.StatefulInstanceInterceptor.invoke(St atefulInstanceInterceptor.java:83) [java] at org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInv ocation.java:101) [java] at org.jboss.aspects.security.AuthenticationInterceptor.invoke(A uthenticationInterceptor.java:77) [java] at org.jboss.ejb3.security.Ejb3AuthenticationInterceptor.invoke( Ejb3AuthenticationInterceptor.java:106) [java] at org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInv ocation.java:101) [java] at org.jboss.ejb3.ENCPropagationInterceptor.invoke(ENCPropagatio nInterceptor.java:46) [java] at org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInv ocation.java:101) [java] at org.jboss.ejb3.asynchronous.AsynchronousInterceptor.invoke(As ynchronousInterceptor.java:106) [java] at org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInv ocation.java:101) [java] at org.jboss.ejb3.stateful.StatefulContainer.dynamicInvoke(State fulContainer.java:333) [java] at org.jboss.aop.Dispatcher.invoke(Dispatcher.java:106) [java] at org.jboss.aspects.remoting.AOPRemotingInvocationHandler.invok e(AOPRemotingInvocationHandler.java:82) [java] at org.jboss.remoting.ServerInvoker.invoke(ServerInvoker.java:73 4) [java] at org.jboss.remoting.transport.socket.ServerThread.processInvoc ation(ServerThread.java:560) [java] at org.jboss.remoting.transport.socket.ServerThread.dorun(Server Thread.java:369) [java] at org.jboss.remoting.transport.socket.ServerThread.run(ServerTh read.java:165) [java] Java Result: 1 View the original post : 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