help with error when running client

[tan kian]

i got this error in DOS when i tried to run my client, can anyone help to identify the problem? i got this problem after i mapped a many-to-1 relationship and depolyed it ignoring some errors i got when verifying.

javax.transaction.TransactionRolledbackException: CORBA TRANSACTION_ROLLEDBACK 9
998 Maybe; nested exception is:
org.omg.CORBA.TRANSACTION_ROLLEDBACK: ----------BEGIN server-side stack
trace----------
org.omg.CORBA.TRANSACTION_ROLLEDBACK: vmcid: 0x2000 minor code: 1806 complete
d: Maybe
at com.sun.enterprise.iiop.POAProtocolMgr.mapException(POAProtocolMgr.ja
va:201)
at com.sun.ejb.containers.BaseContainer.postInvoke(BaseContainer.java:79
7)
at com.sun.ejb.containers.EJBObjectInvocationHandler.invoke(EJBObjectInv
ocationHandler.java:137)
at $Proxy13.createStudent(Unknown Source)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.
java:39)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAcces
sorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:324)
at com.sun.corba.ee.impl.presentation.rmi.ReflectiveTie._invoke(Reflecti
veTie.java:117)
at com.sun.corba.ee.impl.protocol.CorbaServerRequestDispatcherImpl.dispa
tchToServant(CorbaServerRequestDispatcherImpl.java:651)
at com.sun.corba.ee.impl.protocol.CorbaServerRequestDispatcherImpl.dispa
tch(CorbaServerRequestDispatcherImpl.java:190)
at com.sun.corba.ee.impl.protocol.CorbaMessageMediatorImpl.handleRequest
Request(CorbaMessageMediatorImpl.java:1653)
at com.sun.corba.ee.impl.protocol.CorbaMessageMediatorImpl.handleRequest
(CorbaMessageMediatorImpl.java:1513)
at com.sun.corba.ee.impl.protocol.CorbaMessageMediatorImpl.handleInput(C
orbaMessageMediatorImpl.java:895)
at com.sun.corba.ee.impl.protocol.giopmsgheaders.RequestMessage_1_2.call
back(RequestMessage_1_2.java:172)
at com.sun.corba.ee.impl.protocol.CorbaMessageMediatorImpl.handleRequest
(CorbaMessageMediatorImpl.java:668)
at com.sun.corba.ee.impl.transport.SocketOrChannelConnectionImpl.dispatc
h(SocketOrChannelConnectionImpl.java:375)
at com.sun.corba.ee.impl.transport.SocketOrChannelConnectionImpl.read(So
cketOrChannelConnectionImpl.java:284)
at com.sun.corba.ee.impl.transport.ReaderThreadImpl.doWork(ReaderThreadI
mpl.java:73)
at com.sun.corba.ee.impl.orbutil.threadpool.ThreadPoolImpl$WorkerThread.
run(ThreadPoolImpl.java:382)
Caused by: javax.ejb.TransactionRolledbackLocalException: Exception thrown from
bean; nested exception is: com.sun.jdo.api.persistence.support.JDOUserException:
JDO76017: Cannot create SCO instance of class CoursesBean_1316087683_JDOState b
ecause it is not a valid type.
at com.sun.ejb.containers.BaseContainer.checkExceptionClientTx(BaseConta
iner.java:2564)
at com.sun.ejb.containers.BaseContainer.postInvokeTx(BaseContainer.java:
2416)
at com.sun.ejb.containers.BaseContainer.postInvoke(BaseContainer.java:76
3)
at com.sun.ejb.containers.EJBLocalHomeInvocationHandler.invoke(EJBLocalH
omeInvocationHandler.java:197)
at $Proxy6.create(Unknown Source)
at StudentSessionBean.createStudent(StudentSessionBean.java:19)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.
java:39)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAcces
sorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:324)
at com.sun.enterprise.security.SecurityUtil$2.run(SecurityUtil.java:146)

at java.security.AccessController.doPrivileged(Native Method)
at com.sun.enterprise.security.application.EJBSecurityManager.doAsPrivil
eged(EJBSecurityManager.java:930)
at com.sun.enterprise.security.SecurityUtil.invoke(SecurityUtil.java:151
)
at com.sun.ejb.containers.EJBObjectInvocationHandler.invoke(EJBObjectInv
ocationHandler.java:128)
... 17 more

----------END server-side stack trace---------- vmcid: 0x2000 minor code: 1806
completed: Maybe

[Jesus Angeles]

it is possible that those errors in verification are the reason