pBeans is a Java based persistence framework and an Object/Relational (O/R) database mapping layer. It is designed to be simple to use and completely automated.
...dedicated into Java open source projects
It is a feature-rich implementation of the persistence part of Enterprise Java Beans 3.0, also known as the Java Persistence API (JPA), and is available under the terms of the Apache Software License. OpenJPA can be used as a stand-alone POJO persistence layer, or it can be integrated into any EJB3.0 compliant container and many lightweight frameworks.
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.
Persist is a minimalist Java ORM/DAO library designed for high performance and ease of use. Unlike most ORM tools, Persist does not aim to completely isolate application code from relational databases. Instead, it intends to minimize the effort to handle data stored in a RDBMS through JDBC, without making compromises on performance and flexibility.
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.
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.
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