The EntityManagerFactory
creates
EntityManager
instances for application
use.
Note | |
---|---|
Kodo extends the standard |
Within a container, you will typically use injection
to access an EntityManagerFactory
.
There are, however, alternative mechanisms for
EntityManagerFactory
construction.
Some vendors may supply public constructors for their
EntityManagerFactory
implementations, but
we recommend: using the Java Connector Architecture (JCA) in a managed
environment; using the Persistence
class's
createEntityManagerFactory
methods in an
unmanaged environment, as described in
Chapter 6, Persistence. These strategies allow
vendors to pool factories, cutting down on resource utilization.
JPA allows you to create and configure an
EntityManagerFactory
, then store it in a
Java Naming and Directory Interface (JNDI) tree for later retrieval
and use.