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The Java Persistence API (JPA) is documented as part of the EJB 3.0 specification, and is available at:
http://jcp.org/aboutJava/communityprocess/final/jsr220/index.htmlIBM developerWorks has many articles on JPA. Just type JPA into the search field at the developerWorks Web site:
http://www.ibm.com/developerworks/
ibm.com/redbooks