Hibernate version: 3.1

Full stack trace of any exception that occurs:

java.io.NotSerializableException: org.hibernate.engine.EntityUniqueKey
at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1075)
at java.io.ObjectOutputStream.writeObject(ObjectOutputStream.java:291)
at java.util.HashMap.writeObject(HashMap.java:982)
at sun.reflect.GeneratedMethodAccessor145.invoke(Unknown Source)
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.defaultWriteObject(ObjectOutputStream.java:380)
at org.hibernate.engine.StatefulPersistenceContext.writeObject(StatefulPersistenceContext.java:236)

Name and version of the database you are using: MySql 5.0.15

I get the following exception when using EJB3 extended persistance in my statefull session bean.

Rgds, Ales

Do all of the classes in your object model implement java.io.Serializable ?

Yep.

But what has this got to do with my exception, which clearly says that EntityUniqueKey is the one that is not serializable?

ok ... what is the context in which this happens? startup, a save, a read, etc. you can't narrow it down to one or two particular cases?

It happens when my ejb3 stateful session bean goes into passivation.