Error unmarshaling return; nested exception is:

[Aravind_RP <Ar...@infosys.com>]

hi 
When i try to access my service using rmi it throws the following
exception..

Error unmarshaling return; nested exception is: 
	java.io.WriteAbortedException: writing aborted;
java.io.NotSerializableException: org.ofbiz.service.ModelNotification
java.rmi.UnmarshalException: Error unmarshaling return; nested exception is: 
	java.io.WriteAbortedException: writing aborted;
java.io.NotSerializableException: org.ofbiz.service.ModelNotification
	at
sun.rmi.transport.StreamRemoteCall.executeCall(StreamRemoteCall.java:217)
	at sun.rmi.server.UnicastRef.invoke(UnicastRef.java:126)
	at org.ofbiz.service.rmi.RemoteDispatcherImpl_Stub.runSync(Unknown Source)
	at Hello3Client.main(Hello3Client.java:59)
Caused by: java.io.WriteAbortedException: writing aborted;
java.io.NotSerializableException: org.ofbiz.service.ModelNotification
	at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1303)
	at java.io.ObjectInputStream.readObject(ObjectInputStream.java:339)
	at javolution.util.FastList.readObject(Unknown Source)
	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 java.io.ObjectStreamClass.invokeReadObject(ObjectStreamClass.java:919)
	at java.io.ObjectInputStream.readSerialData(ObjectInputStream.java:1813)
	at
java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:1713)
	at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1299)
	at java.io.ObjectInputStream.defaultReadFields(ObjectInputStream.java:1912)
	at java.io.ObjectInputStream.readSerialData(ObjectInputStream.java:1836)
	at
java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:1713)
	at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1299)
	at java.io.ObjectInputStream.defaultReadFields(ObjectInputStream.java:1912)
	at java.io.ObjectInputStream.readSerialData(ObjectInputStream.java:1836)
	at
java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:1713)
	at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1299)
	at java.io.ObjectInputStream.readObject(ObjectInputStream.java:339)
	at
sun.rmi.transport.StreamRemoteCall.executeCall(StreamRemoteCall.java:215)
	... 3 more
Caused by: java.io.NotSerializableException:
org.ofbiz.service.ModelNotification
	at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1075)
	at java.io.ObjectOutputStream.writeObject(ObjectOutputStream.java:291)
	at javolution.util.FastList.writeObject(Unknown Source)
	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 java.io.ObjectStreamClass.invokeWriteObject(ObjectStreamClass.java:890)
	at java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1333)
	at
java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1284)
	at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1073)
	at
java.io.ObjectOutputStream.defaultWriteFields(ObjectOutputStream.java:1369)
	at java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1341)
	at
java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1284)
	at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1073)
	at
java.io.ObjectOutputStream.defaultWriteFields(ObjectOutputStream.java:1369)
	at java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1341)
	at
java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1284)
	at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1073)
	at java.io.ObjectOutputStream.writeObject(ObjectOutputStream.java:291)
	at sun.rmi.server.UnicastServerRef.dispatch(UnicastServerRef.java:332)
	at sun.rmi.transport.Transport$1.run(Transport.java:153)
	at java.security.AccessController.doPrivileged(Native Method)
	at sun.rmi.transport.Transport.serviceCall(Transport.java:149)
	at sun.rmi.transport.tcp.TCPTransport.handleMessages(TCPTransport.java:460)
	at
sun.rmi.transport.tcp.TCPTransport$ConnectionHandler.run(TCPTransport.java:701)
	at java.lang.Thread.run(Thread.java:595)

my service definitions and service.xml as follows

<service name="retriveCateogaryId" engine="java" auth="false" export="true"
        location="org.ofbiz.hello3.Hello3Services"
invoke="retriveCateogaryId">
        <description>Retrives all Cateogary Id</description>
        <attribute name="productStoreId" mode="IN" type="String"
optional="true"/>
         <attribute name="userLoginId" mode="IN" type="String"
optional="true"/>
        <attribute name="cateogaryId" mode="OUT" type="String"
optional="false"/>
        </service>

and am invoking through a client.

resultQuery = rd.runSync("retriveCateogaryId",
                    UtilMisc.toMap("productStoreId","9000"));

please if any one can suggest a solution
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