EJBs and Transactions
One of the services provided by the EJBs container is transactional control. Transactions can be controlled either programmatically by the developer or declaratively by the container. If transactions for a bean are controlled by the container, they are considered container-managed transactions (CMTs) and are declared by making entries in a configuration file used to deploy the EJB application. If the transactions for a bean are controlled by programmatic instructions, then they are considered bean-managed transactions (BMTs).
Since entity beans are guaranteed to be synchronized with a persistent data store, they are considered transactional by nature. With session beans, transactions are optional, but with entity beans, ...
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