ejb error((MARSHAL) Could not find class) when using OneToMany relationship

I am using Netbeans 5.5 with J2EE App Server 9. I have two entity beans with a OneToMany Uni-directional relationship. I have a Remote Stateless session bean which has persistence operations for creating and searching etc.. I am accessing the remote bean via jndi from a j2ee java client. The access works fine. The session bean persist operation creates data in both the entities (cascade persist).

But, after the data is created, when I access the entity manager find() method from the session bean via the client errors out. This error only happens for the entities with OneToMany relationship, not for OneToOne relationships.

I am using TOPLINK persistence provider accessing a derby data source. I have the latest persistence library jar files in the library classpath.

client code:

Phone p1 =new Phone();

p1.setPnumber("999 999 9999");

Customer c1 =new Customer();

c1.setLname("Smith");

c1.getPhone().add(p1);

int pk = agent.createCustomer(c1);// creates the entities

Customer c2 = agent.findCustomer(pk);// this causes the ERROR

session bean code:

@PersistenceContextprivate EntityManager em;

publicint createCustomer(Customer c){

em.persist(c);

return c.getId();

}

public Customer findCustomer(int i){// this causes the ERROR

return em.find(Customer.class, i);

}

exception:

Mar 30, 2007 3:25:00 PM com.sun.corba.ee.impl.encoding.CDRInputStream_1_0 read_value

WARNING: "IOP00810257: (MARSHAL) Could not find class"

org.omg.CORBA.MARSHAL:vmcid: SUN minor code: 257 completed: Maybe

at com.sun.corba.ee.impl.logging.ORBUtilSystemException.couldNotFindClass(ORBUtilSystemException.java:8309)

at com.sun.corba.ee.impl.encoding.CDRInputStream_1_0.read_value(CDRInputStream_1_0.java:984)

at com.sun.corba.ee.impl.encoding.CDRInputStream.read_value(CDRInputStream.java:259)

at com.sun.corba.ee.impl.io.IIOPInputStream.inputObjectField(IIOPInputStream.java:1987)

at com.sun.corba.ee.impl.io.IIOPInputStream.inputClassFields(IIOPInputStream.java:2211)

at com.sun.corba.ee.impl.io.IIOPInputStream.inputObject(IIOPInputStream.java:1219)

at com.sun.corba.ee.impl.io.IIOPInputStream.simpleReadObject(IIOPInputStream.java:398)

***exception in Client_1 ***

at com.sun.corba.ee.impl.io.ValueHandlerImpl.readValueInternal(ValueHandlerImpl.java:329)

at com.sun.corba.ee.impl.io.ValueHandlerImpl.readValue(ValueHandlerImpl.java:295)

at com.sun.corba.ee.impl.encoding.CDRInputStream_1_0.read_value(CDRInputStream_1_0.java:1005)

at com.sun.corba.ee.impl.encoding.CDRInputStream.read_value(CDRInputStream.java:259)

at com.sun.corba.ee.impl.presentation.rmi.DynamicMethodMarshallerImpl$14.read(DynamicMethodMarshallerImpl.java:333)

at com.sun.corba.ee.impl.presentation.rmi.DynamicMethodMarshallerImpl.readResult(DynamicMethodMarshallerImpl.java:424)

at com.sun.corba.ee.impl.presentation.rmi.StubInvocationHandlerImpl.privateInvoke(StubInvocationHandlerImpl.java:162)

at com.sun.corba.ee.impl.presentation.rmi.StubInvocationHandlerImpl.invoke(StubInvocationHandlerImpl.java:119)

at com.sun.corba.ee.impl.presentation.rmi.bcel.BCELStubBase.invoke(BCELStubBase.java:197)

at com.titan.ejb.__Tester1Remote_Remote_DynamicStub.findCustomer(__Tester1Remote_Remote_DynamicStub.java)

at com.titan.ejb._Tester1Remote_Wrapper.findCustomer(com.titan.ejb._Tester1Remote_Wrapper.java)

at com.titan.clients.Client_1.main(Client_1.java:37)

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 com.sun.enterprise.util.Utility.invokeApplicationMain(Utility.java:232)

at com.sun.enterprise.appclient.MainWithModuleSupport.<init>(MainWithModuleSupport.java:329)

at com.sun.enterprise.appclient.Main.main(Main.java:180)

Caused by: java.lang.ClassNotFoundException

... 25 more

javax.ejb.EJBException: nested exception is: java.rmi.MarshalException: CORBA MARSHAL 1398079745 Maybe; nested exception is:

org.omg.CORBA.MARSHAL:vmcid: SUN minor code: 257 completed: Maybe

java.rmi.MarshalException: CORBA MARSHAL 1398079745 Maybe; nested exception is:

org.omg.CORBA.MARSHAL:vmcid: SUN minor code: 257 completed: Maybe

at com.sun.corba.ee.impl.javax.rmi.CORBA.Util.mapSystemException(Util.java:224)

at com.sun.corba.ee.impl.presentation.rmi.StubInvocationHandlerImpl.privateInvoke(StubInvocationHandlerImpl.java:172)

at com.sun.corba.ee.impl.presentation.rmi.StubInvocationHandlerImpl.invoke(StubInvocationHandlerImpl.java:119)

at com.sun.corba.ee.impl.presentation.rmi.bcel.BCELStubBase.invoke(BCELStubBase.java:197)

at com.titan.ejb.__Tester1Remote_Remote_DynamicStub.findCustomer(__Tester1Remote_Remote_DynamicStub.java)

at com.titan.ejb._Tester1Remote_Wrapper.findCustomer(com.titan.ejb._Tester1Remote_Wrapper.java)

at com.titan.clients.Client_1.main(Client_1.java:37)

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 com.sun.enterprise.util.Utility.invokeApplicationMain(Utility.java:232)

at com.sun.enterprise.appclient.MainWithModuleSupport.<init>(MainWithModuleSupport.java:329)

at com.sun.enterprise.appclient.Main.main(Main.java:180)

Caused by: org.omg.CORBA.MARSHAL:vmcid: SUN minor code: 257 completed: Maybe