Difference between JTA, JPA and plain JDBC in hibernate

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What is the difference between JTA, JPA and plain JDBC in terms of Hibernate?

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JPA (Java Persistence API) is the Java ORM standard/specification for storing, accessing, and managing Java objects in a relational database. Hibernate is an implementation of the Java Persistence API (JPA) specification.

JTA (Java Transaction API) is the Java standard/specification for distributed transactions. It comes into picture when you have transactions that spans across multiple connections/DBs/resources. Atomikos is an implementation of JTA. (Appservers like IBM Websphere has their own JTA implementations.)

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