FlatGroup does not have a no arg constructor

Hi All,
I am using weblogic 6.0 sp1, wrote a custom realm that contains
a class
public class CustomGroup extends FlatGroup implements Serializable
I have a method,
CustomGroup getGroup(String groupId){....}
When the method returns an object of type CustomGroup to the client,
I get the following error,
ERROR:java.rmi.UnmarshalException: failed to unmarshal class admin.rdbmsrealm.CustomGroup;
nested exception is:
     * java.io.InvalidClassException: weblogic.security.acl.FlatGroup,
Missing no-arg constructor for class
Do I HAVE to extend from Flatgroup to implement a group in the
custom realm ?? And does Weblogic always use the Caching realm
to access the RDBMSRealm ??
Thanks in advance,
SKolli

I'm getting the same thing. The message doesn't indicate which of the four beans I have that use type Long is encountering this. I suspect that since it says 'constructor' it is one of the two which uses an Long for a primary key.
Yet another OC4J bug,
Michael A. Moran

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