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The Java Data Objects API (JDO) : a standard interface-based Java model abstraction of persistence, developed by the JCP.

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JDO Service Provider Interface package




This package contains the interfaces and classes used by JDO implementations. 
JDO defines interfaces and classes to be used by application programmers 
when using classes whose instances are to be stored in persistent storage 
(persistence-capable classes), and specifies the contracts between 
suppliers of persistence-capable classes and the 
runtime environment (which is part of the JDO implementation).
The PersistenceCapable interface is implemented by all classes
whose instances are to be made persistent.  The implementation might be
done by a combination of techniques, as determined by the JDO vendor:

Pre-processing .java files
Post-processing .class files
Generating .java or .class files directly from an abstraction

The StateManager interface is the implementation's contact point with
the PersistenceCapable instances.  It defines methods that are called by 
the PersistenceCapable instances to implement the required PersistenceCapable
behavior for persistent and transactional instances.
The JDOPermission class is used to manage security controls on JDO implementations.
The RegisterClassEvent class and RegisterClassListener interface are used
by JDO implementations that need access to metadata of PersistenceCapable classes.
The JDOImplHelper class contains helper methods for JDO implementations.