Java/Hibernate backend with FDS: issues

Question

Hi everyone, I'm quite new to the Flex world but I'm so
excited about all of it that I decided to make a Flex app in order
to get my degree. So, I started by building my own app (which is a
management system for a library) starting from the great example
posted by Marcel Boucher on his blog. I run my app on JBoss
4.2.0-GA.
I'm actually using DB2 8.2 with 6 tables: USER, CUSTOMER,
IDCARD, LOAN, BOOK, AUTHOR.
Hibernate-wise, there should be a one-to-one association
between CUSTOMER and IDCARD (that is every customer has one and
only one idcard), a many-to-many association between IDCARD and
LOAN (that is many idcards can do many loans), a many-to-one
between LOAN and BOOK and a many-to-one between BOOK and AUTHOR.
The problem is that as long as I implement single POJOs
(user.java, customer.java...), correctly mapped with their
configuration file user.hbm.xml and hibernate.cfg.xml, and
respective destinations configured in data-management-config.xml,
BUT WITHOUT SPECIFYING ANY ASSOCIATION, it all runs and works
correctly.
As soon as I complete the database's tables mapping by adding
all the association mappings (I dont know how to exactly map
associations between fds destinations as well) it suddenly goes all
wrong and I keep getting this error in JBoss console:
GRAVE: Servlet /flex threw load() exception
flex.messaging.config.ConfigureException: Unable to create
service 'flex.data.DataService' for 'data-service' due to the
following error: Error instantiating application scoped instance of
type 'flex.data.assemblers.HibernateAssembler' for destination
'user.hibernate'...
Hope someone can help me with this.
Cheers,
Riccardo

Answer 1

Here's the JBoss log file:
JBoss log
And here are all the files involved:
User pojo
User hbm
Customer
pojo
Customer
hbm
Idcard
pojo
Idcard
hbm
Loan
pojo
Loan hbm
Book pojo
Book hbm
Author
pojo
Author hbm
Hibernate
cfg
Data-management-config
Currently the mapped associations are bidirectional CUSTOMER
to IDCARD (one-to-one) and bidirectional AUTHOR to BOOK
(one-to-many/many-to-one). LOAN is not currently mapped because I'm
still thinking about how to do it. Don't mind if you see "italian"
names inside the files, I called the entities with english names
here to make it all more understandable.
Actually what's driving me crazy is that if I map only USER,
CUSTOMER and AUTHOR (which are kinda "boundary" entities, meaning
they exist without any association) as hibernate.cfg.xml resources
(and with their respective destinations in data management), it all
works perfectly. As soon as I complete the mapping this error
suddenly comes up :(