Tranaction problem in CMT based MDB 3.0

Hi all,
In my application there is a EJB project and a JAVA project.
The onMessage Method of the MDB gets the Message from the MQ and sends that data to one of the DAO in JAVA project where data gets inserted in DataBase.
I am using the container based transaction for the MDB. i have not done anything regarding the transaction excepts this.
Now my problem is according the loggers data is inserted successfully, i am using session.save() method which returns primary key, i am also getting this.
But when i check in DataBase, data is NOT present there.
Is there anything more i need to do for CMT based MDB.

Thanks in advance..

Regards,
Piyush