有状态会话bean，返回对象

我在glassfish上部署了一个有状态会话bean，并且有一个名为getCars的方法，它返回Car类的对象集合。 Car类在bean项目和客户端项目中定义（实际上它是同一个类）。我有一个客户端（不是应用程序客户端），我在其中获得了对如描述here所述的bean远程接口的引用。但我的客户craches与这样的例外有状态会话bean，返回对象

 
Exception in thread "main" javax.ejb.EJBException: java.rmi.MarshalException: CORBA BAD_PARAM 1330446342 Maybe; nested exception is: 
     java.io.NotSerializableException: ----------BEGIN server-side stack trace---------- 
org.omg.CORBA.BAD_PARAM: vmcid: OMG minor code: 6 completed: Maybe 
     at com.sun.corba.ee.impl.logging.OMGSystemException.notSerializable(OMGSystemException.java:990) 
     at com.sun.corba.ee.impl.logging.OMGSystemException.notSerializable(OMGSystemException.java:1005) 
     at com.sun.corba.ee.impl.orbutil.ORBUtility.throwNotSerializableForCorba(ORBUtility.java:753) 
     at com.sun.corba.ee.impl.encoding.CDROutputStream_1_0.write_abstract_interface(CDROutputStream_1_0.java:765) 
     at com.sun.corba.ee.impl.encoding.CDROutputObject.write_abstract_interface(CDROutputObject.java:709) 
     at com.sun.corba.ee.impl.javax.rmi.CORBA.Util.writeAbstractObject(Util.java:501) 
     at com.sun.corba.ee.impl.io.IIOPOutputStream.writeObjectOverride(IIOPOutputStream.java:197) 
     at java.io.ObjectOutputStream.writeObject(ObjectOutputStream.java:326) 
     at java.util.ArrayList.writeObject(ArrayList.java:570) 
     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 com.sun.corba.ee.impl.io.IIOPOutputStream.invokeObjectWriter(IIOPOutputStream.java:760) 
     at com.sun.corba.ee.impl.io.IIOPOutputStream.outputObject(IIOPOutputStream.java:716) 
     at com.sun.corba.ee.impl.io.IIOPOutputStream.simpleWriteObject(IIOPOutputStream.java:227) 
     at com.sun.corba.ee.impl.io.ValueHandlerImpl.writeValueInternal(ValueHandlerImpl.java:268) 
     at com.sun.corba.ee.impl.io.ValueHandlerImpl.writeValueWithVersion(ValueHandlerImpl.java:240) 
     at com.sun.corba.ee.impl.io.ValueHandlerImpl.writeValue(ValueHandlerImpl.java:193) 
     at com.sun.corba.ee.impl.encoding.CDROutputStream_1_0.callWriteValue(CDROutputStream_1_0.java:932) 
     at com.sun.corba.ee.impl.encoding.CDROutputStream_1_0.writeRMIIIOPValueType(CDROutputStream_1_0.java:917) 
     at com.sun.corba.ee.impl.encoding.CDROutputStream_1_0.write_value(CDROutputStream_1_0.java:1044) 
     at com.sun.corba.ee.impl.encoding.CDROutputStream_1_0.write_value(CDROutputStream_1_0.java:1057) 
     at com.sun.corba.ee.impl.encoding.CDROutputStream_1_0.write_value(CDROutputStream_1_0.java:774) 
     at com.sun.corba.ee.impl.encoding.CDROutputObject.write_value(CDROutputObject.java:681) 
     at com.sun.corba.ee.impl.presentation.rmi.DynamicMethodMarshallerImpl$14.write(DynamicMethodMarshallerImpl.java:394) 
     at com.sun.corba.ee.impl.presentation.rmi.DynamicMethodMarshallerImpl.writeResult(DynamicMethodMarshallerImpl.java:490) 
     at com.sun.corba.ee.impl.presentation.rmi.ReflectiveTie._invoke(ReflectiveTie.java:180) 
     at com.sun.corba.ee.impl.protocol.CorbaServerRequestDispatcherImpl.dispatchToServant(CorbaServerRequestDispatcherImpl.java:682) 
     at com.sun.corba.ee.impl.protocol.CorbaServerRequestDispatcherImpl.dispatch(CorbaServerRequestDispatcherImpl.java:216) 
     at com.sun.corba.ee.impl.protocol.CorbaMessageMediatorImpl.handleRequestRequest(CorbaMessageMediatorImpl.java:1841) 
     at com.sun.corba.ee.impl.protocol.CorbaMessageMediatorImpl.handleRequest(CorbaMessageMediatorImpl.java:1695) 
     at com.sun.corba.ee.impl.protocol.CorbaMessageMediatorImpl.handleInput(CorbaMessageMediatorImpl.java:1078) 
     at com.sun.corba.ee.impl.protocol.giopmsgheaders.RequestMessage_1_2.callback(RequestMessage_1_2.java:221) 
     at com.sun.corba.ee.impl.protocol.CorbaMessageMediatorImpl.handleRequest(CorbaMessageMediatorImpl.java:797) 
     at com.sun.corba.ee.impl.protocol.CorbaMessageMediatorImpl.dispatch(CorbaMessageMediatorImpl.java:561) 
     at com.sun.corba.ee.impl.protocol.CorbaMessageMediatorImpl.doWork(CorbaMessageMediatorImpl.java:2558) 
     at com.sun.corba.ee.impl.orbutil.threadpool.ThreadPoolImpl$WorkerThread.performWork(ThreadPoolImpl.java:492) 
     at com.sun.corba.ee.impl.orbutil.threadpool.ThreadPoolImpl$WorkerThread.run(ThreadPoolImpl.java:528)

我认为问题是在Car类的对象的编组。如何用对象编组来解决这个问题？

来源

2011-04-27 maks

Car类必须实现java.io.Serializable，以便它可以序列化并通过“线路”传输。 Reference: Java serialization

还要确保Car类的所有字段都是可序列化的类型。例如，Car可能有一个private Engine engine字段。 Engine也必须是可序列化的。（如果在序列化过程中被忽略，则标记为transient）

来源

2011-04-27 16:01:51 Bozho

我已经完成了它的序列化，但它再次引发此异常。 – maks 2011-04-27 16:15:32

@maks - 参见更新的 – Bozho 2011-04-27 16:16:12

nope，Car类有2个attr int，1个String和1个java.sql.Date。他们都是可序列化的 – maks 2011-04-27 16:24:37

有状态会话bean，返回对象

回答

相关问题