This figure illustrates the relationship between entity architecture
elements. A Persistence
class can create one or more
EntityManagerFactory
objects. An EntityManagerFactory
object can
create one or more EntityManagers
. An EntityManagerFactory
is
configured by one Persistence Unit. The properties defined by the
Persistence Unit are inherited by the EntityManager
. The Persistence
Unit defines the Persistence Context. The Persistence Context is the set
of managed Entity
instances within the EntityManager
. One or more
EntityManagers
can manage a Persistence Context.