XML-based Object/Relational mapping and persistence framework as well as a data access abstraction layer. [Open source]

An Object-Relational mapping framework working with relational databases. [Open Source]

An XML-based persistence layer. Part of the Apache Jakarta family. [Open Source, BSD-like]

A framework that provides transparent persistence of Java objects for JDBC-compliant RDBMS. Implements ODMG 3.0, JDO and uses XML-based O/R Mapping. [Open Source, LGPL]

Hibernate an open source Java persistence framework project. Perform powerful object relational mapping and query databases using HQL and SQL. [Open source, LGPL]

Object-relational bridge by Oracle. Quick tour, tutorials, and howtos. [Commercial]

A simple transactional persistence engine for Java. It can used to store a mix of objects and BLOBs, and all updates are done in a transactionally safe manner. JDBM also provides scalable data structures, such as HTree and B+Tree, to support persisten...

Wikibook on JPA, and Java persistence from Wikimedia Wikibooks.

ORM project from Eclipse (Oracle, Sun). Provides ORM, JPA, OXM, JAXB, SDO, WebServices, EIS. JPA 2.0 reference implementation, JPA provider of Oracle WebLogic, Sun Glassfish. [Open source, EPL]

Provides the following features: build generated client side data objects structurally mirroring server side business objects; pluggable persistence; pluggable binding between client and server; pluggable query mechanism; zero-configuration externaliz...