WebLogic's EJB container supports EJBs that can participate in distributed transactions. EJBs deployed to WebLogic Server can be involved in JTA transactions that may cover updates to multiple data stores. A single transaction can span multiple EJBs deployed to multiple WebLogic instances. The EJBs also can participate in the two-phase commit protocol, which coordinates transactional updates across two or more resource managers.
For entity beans, it is the EJB container that always manages the
transaction boundaries. Session and message-driven beans support both
bean-managed and container-managed transactions. In the case of
bean-managed transactions, the EJB implementation must explicitly
supervise the transaction boundaries. Typically, the EJB code will
acquire a reference to the
EJBContext, and then make explicit calls
rollback methods to mark the start and completion
of the transaction. For container-managed beans, the EJB container
manages all transaction boundaries. You can specify the transaction
attributes for the EJB methods in the
ejb-jar.xml descriptor file for the EJB
component. The default transaction setting for an EJB method is
Supports. In other words, all EJB methods are
capable of participating in a transaction, if one exists. Of course,
you must not use the
UserTransaction interface within an EJB method
that supports container-managed transactions.
A client ...