Apache OpenJPA – Java persistence project

Apache OpenJPA is a Java persistence project that can be used as a stand-alone POJO persistence layer or integrated into any Java EE compliant container and many other lightweight frameworks, such as Tomcat and Spring.

It is an object-relational mapping (ORM) solution which simplifies storing objects in databases.

This is free and open source software.

Features include:

  • Transparency – the existing application or the persistent domain model requires no change to upgrade from a single database to a distributed database environment.
  • Custom Distribution Policy – user application decides how the newly persistent instances be distributed across the database slices.
  • Heterogeneous Database – each slice can be configured independently with its own JDBC driver and other connection parameters
  • Parallel Execution – all database operations such as query, commit or flush operates in parallel across the database slices. The execution threading policy is configurable.
  • Distributed Query – queries are executed across all slices and the results are merged into a single list. The query result that includes ORDER BY clause are sorted correctly by merging results from each individual slice.
  • Targeted Query – target the query only to a subset of slices rather than all slices by setting a hint.
  • Distributed Transaction – the database slices participate in a global transaction provided each slice is configured with a XA-compliant JDBC driver, even when the persistence unit is configured for RESOURCE_LOCAL transaction.
  • Collocation Constraint.

Website: openjpa.apache.org
Support: Documentation
Developer: Apache Software Foundation
License: Apache License 2.0

Apache OpenJPA is written in Java. Learn Java with our recommended free books and free tutorials.

Return to Java ORM Software Home Page


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