[castor-dev] how can i inform Castor JDO engine that i will use EJB Container's Transaction Management?

[ZHAO,YUN (HP-China,ex2)]

I have a session bean and a jdo class.   The session bean's business methods use Weblogic Server's EJB Container's Transaction Management--there are no  "db.begin()" and "db.commit()" calls again,  and create and use a org.exolab.castor.jdo.Database object, too.   But it seems that JDO engine don't know that it is using Container Management Transaction[CMT], because it threw a exception with a message of "there is no transaction in the executed thread".   So i want to know how i can inform Castor JDO engine that i will use EJB Container's Transaction Management?   Thank you very much!     yamssar