How can I do a many to many relation in JBoss 3.0

[fuweweu]

Where can I find a sample of many to many relation for CMP 2.x in JBoss 3.x?
When I run my test, I get my remote interface and execute the method that returns a java.util.Set containing the other table data, then it throws:

java.lang.reflect.UndeclaredThrowableException
at $Proxy1.getDadoClips(Unknown Source)
at br.com.mondo.spice.core.tests.TestBean.main(TestBean.java:65)
Caused by: java.io.NotSerializableException: org.jboss.ejb.plugins.cmp.jdbc.bridge.RelationSet
at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1054)
at java.io.ObjectOutputStream.writeObject(ObjectOutputStream.java:278)
at java.rmi.MarshalledObject.(MarshalledObject.java:92)
at org.jboss.invocation.jrmp.server.JRMPInvoker.invoke(JRMPInvoker.java:367)
at sun.reflect.GeneratedMethodAccessor30.invoke(Unknown Source)
(......)


thanks

[dsundstrom]

A relationship set can not be exposed over a remote interface (it is not serializable). The is requirement of the EJB 2.0 specification. You can simply copy the set and return the copy. Something like this:

return new HashSet(getRelationshipSet());