Chapter 2 : Introduction to Java Persistence API / Topic : The Java Persistence API, JPA,ORM,Database and the Application, Architecture of JPA, How JPA Works? JPA Specifications. / Content : JPA provides standard mechanisms to use Object Relational Mapping tools, Object-relational mapping with the Java Persistence API is entirely metadata driven, Architecture of JPA ,ORM mapping enhancements , EntityManager and the Query APIs , Support for validation