MATHEMA Software GmbH. It doesn't follow any persistence management standards but relies on common design patterns and is production-proved in both JSE and JEE environments. PriDE can really claim to be the world's smallest persistence manager, coming as a single library of less than 100k, without requiring XML and appropriate parser frameworks or other helper libraries beside the JRE.
PriDE gains its simplicity from a few important design decisions assuming an application architecture based on approved and widly recommended design patterns. This allows to dispense with some popular features which make O/R mapping toolkits fat and sometimes cause a kind of uncontrollable and unexplainable self-will when being used extensively. Many of these design patterns are related to a layered software architecture which is most often used for the design of distributed 3-tier systems. However, a layered architecture is in general reasonable and strongly recommended for any complex system, not only for distributed applications.
The design was partly inspired by Scott W. Ambler's white paper "The Design of a Robust Persistence Layer For Relational Databases". The manual provides a feature list allowing to decide if the toolkit matches the individual requirements in a software development project.
quick start tutorial. A complete overview about PriDE's working principles can be found in the introduction chapter.
PriDE claims to be high-performant in the sense, that it does not waste mentionable time over pure JDBC. In particular it allows e.g. fast processing of large result sets which is a known problem with standards like JDO or JPA. It does not show any side-effects by transparent caching, relationship or entity management and thus doesn't cause bad surprises when being used in large-scale projects. It does not claim to be faster than the database itself, as it does not automatically perform any caching, expression optimization, or load/store-optimization. Optimization is supposed to be in the application's responsibility as it often turned out in practice that automatic optimizations by persistence managers caused at least as many problems as they solve.
PriDE integrates with CUBACUBA is a small OpenSource framework for the development of components which can be run as EJBs, AXIS or CXF WebServices, or embedded in a stand-alone application. PriDE can be used as a persistence manager for CUBA components. Check out the examples on the CUBA website at http://cuba.sourceforge.net/examples/pride.