Java Open Source Projects Directory

A small (less then 50KB) persistence framework.

• Category: Persistence
• License:  GNU General Public License (GPL)
• HomePage: http://julp.sourceforge.net/

Space4J (or S4J, for short) is a free prevalence implementation in Java. Prevalence is a concept started by Klaus Wuestefeld on how to store data in a real object oriented way, using only memory snapshots, transaction logs and serialization. In addition to the basic functionality it offers transparent support for clustering, passivation and indexing.

• Category: Persistence
• License:  GNU Library or Lesser General Public License (LGPL)
• HomePage: https://space4j.dev.java.net/

Speedo is an open source implementation of the JDO (TM) specification.

• Category: Persistence
• License:  GNU Library or Lesser General Public License (LGPL)
• HomePage: http://speedo.objectweb.org/index.html

JDBCPersistence is yet another OR mapping layer. It differs from its peers in both implementation and API. Using bytecode generation at its core the framework generates classes that implement JDBC Logic which is specific to a table/bean pair. JDBCPersistence generates persistor classes at runtime on demand incurring no noticeable overhead on the development process. The entire framework configuration is done via API, which significantly improves start-up time and reduces library size.

• Category: Persistence
• License:  GNU Library or Lesser General Public License (LGPL)
• HomePage: https://jdbcpersistence.dev.java.net/

XORM is an extensible object-relational mapping layer for Java applications

• Category: Persistence
• License:  GNU General Public License (GPL)
• HomePage: http://xorm.sourceforge.net/

Jaxor is a code-generating OR mapping tool which takes information defined in XML relating to the relational entities to be mapped and generates classes, interfaces and finder objects which can be used from any Java application (including JFC/Swing, J2EE and command-line tools). The actual code generation is handled by Velocity templates rather than by fixed mechanisms within the tool. This flexability allows easy tailoring and modification to the formatting or even the code that gets generated.

• Category: Persistence
• License:  BSD License
• HomePage: http://jaxor.sourceforge.net/

JDBM is a transactional persistence engine for Java. It aims to be for Java what GDBM is for other languages (C/C++, Python, Perl, etc.): a fast, simple persistence engine. You can use it 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 persistence of large object collections.

• Category: Persistence
• License:  BSD License
• HomePage: http://jdbm.sourceforge.net/

TriActive JDO (TJDO) is an open source implementation of Sun's JDO specification (JSR 12), designed to support transparent persistence using any JDBC-compliant database. TJDO has been deployed and running successfully in many commercial installations since 2001.

• Category: Persistence
• License:  Apache Software License
• HomePage: http://tjdo.sourceforge.net/