EJB 3.0 entity problem

Question

I'm tearing my hair out at this one.
Using JDeveloper 10.1.3, I am generating EJB 3.0 CMP entity beans from tables. On creation from one particular table, the Column I want to use as the primary key does not get automatically annotated with @Column(name="table_name") so I add this in manually and also annotate the column with @Id.
Whenever I try and use a value which has been mapped as a String within the OC4J container in JDeveloper, it works fine. Whenever I try and access it from within OracleAS 10.1.3, I get a null pointer - but accessing values which are mapped as Long works fine! This is the only one of the Entities I created which does this. I also get a null pointer if I try and assign the entity to a member variable.
What I want to know is has anyone else seen this behaviour before?
Thanks in advance
Paul

Answer 1

haha I will take that as a no then... ;)
One other thing is that the entity in question is also causing a serialization error when being transferred from the bean to the test client when run within JDeveloper. Really really weird.
Any clues/comments appreciated.
Paul