8.5. JDBC and JNDI
Any EJB can use JDBC calls to interact with a database, except entity EJBs with container-managed persistence. In that case, the database interaction is implemented by the container. Entity EJBs will almost always require database connectivity, but session and message-driven EJBs will often interact with a database as well. [3]
[3] The improvements in the entity EJB architecture introduced with EJB2.0 have reduced the need for session and message-driven EJBs to interact directly with databases.
EJBs obtain a connection to the database using the EJB server’s JNDI implementation—that is, they perform a lookup() call on the InitialContext or one of its subcontexts. The name supplied to the lookup() call is arbitrary; it will be ...
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