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.
Key Features
- 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.
Related Software
| Java Object-Relational Mapping Software | |
|---|---|
| Hibernate ORM | Idiomatic persistence for Java and relational databases |
| MyBatis | Persistence framework with custom SQL and stored procedures |
| Apache Cayenne | Provides object-relational mapping (ORM) and remoting services |
| jOOQ | jOOQ Object Oriented Querying |
| DataNucleus | Supports JDO and JPA API's for persistence |
| Apache OpenJPA | Java persistence project |
| Ebean | Designed to be simpler to use and understand than JPA or JDO products |
| EclipseLink | Persistence solution addressing relational, XML, and database web services |
| Persism | Lightweight, auto discovery, autoconfiguration ORM |
Read our verdict in the software roundup.
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