Abstract

Data persistence is a crucial part of software systems. Most software applications use relational databases as datastores, but recently NoSQL data stores like MongoDB, Redis, and Cassandra are getting popular. Java provides the JDBC API to talk to the database, but it is a low-level API that requires lots of boilerplate coding. The JavaEE platform provides the Java Persistence API (JPA) specification, an object-relational mapping (ORM) framework. Hibernate and EclipseLink are the most popular JPA implementations. Other popular persistence frameworks, such as MyBatis and JOOQ, are more SQL-focused.

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