•PersistenceManagerFactory
(PMF)
•PersistenceManager (PM)
•PersistenceCapable (PC)
•StateManager (SM)
•JDOHelper: This class
defines static methods that allow a
JDO-aware application to examine the runtime state of instances
•JDOImplHelper:
Contains methods to register metadata for persistence-capable classes, and for operations that
need to be performed by JDO
implementations, not by end-users.