XSpace is a globally accessible repository for hierarchically-keyed information. It provides persistence for trees with an elegant tree-navigation API. XSpace also publishes real-time events whenever a persisted tree is updated.
Persistence Framework for Java with no JDBC or SQL knowlege needed. An easy to use Administration GUI is provided to hook into almost any database. No XML configuration mapping files! Easiest Java Database layer out there period.
Datadog is an object persistence layer written in Java. Features include caching, transaction support, and much more using a rich and flexible API.
Datadog is a dead project, and has not been updated since 2002. Use Hibernate if you must use Java.
Ridiculously simple, Prevayler provides transparent ACID persistence and replication for plain old Java objects. It is literally several thousand times faster than using a relational database through JDBC.
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JPO (Jigs Persistent Objects) is the persistence layer for 'Jigs for Java' web applications, extracted here for use outside of 'Jigs'. JPO supports Domain-Driven Design while embracing the use of SQL snippets for object-based queries.
Mnemosyne is an in-memory object database for Java. It uses AOP to achieve transparent persistence, and object level versioning and locking to provide ACID transaction support. Data is persisted through transaction logging and periodic system snapshots
Persistence Framework for J2ME; DAO layer for MIDP. It enables the developer to Query Value/Data Objects in a RecordStore. Contains methods like dao.save(vo), dao.update(vo), dao.delete(vo) and dao.findContaining(Class vo, String where).
PAiN Mud codebase is a new MUD codebase written in Java. It provides general purpose persistence engine (PAiN DB) and ability of dynamic code reloading.
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XORM is an extensible object-relational mapping layer for Java
applications. It provides interface-based persistence to RDBMSs using the Java Data Objects (JDO) API while allowing developers to focus on the object model, not the physical layer.
JETHRO (Java Engine for Translating and Hiding Relational to Object) is a "bottom-up" persistence framework, designed in an "API+Provider" fashion. Based on the Data Transfer Object (DTO) concept, it offers a Transparent Query engine.
The ObjectBase Project could have been called Object Oriented DataseBase but we found at least two contradictions in that. This is not object oriented, it is just objects. This is not a database because we do not persist data, we persist objects.
RDBS2J is a GUI based mapping tool from relational database schema to persistent java classes which use JDO as persistence mechanism. The mapping can be modified by the GUI. The current version is designed to create code for Apache-OJB.
A simple object persistence mechanism for Java that can be added to an application in minutes. All data is kept in memory and stored as property files in a Maildir, allowing external viewing and modification of data.
A unique persistence layer for Java. CODO (Cursor Oriented Data Objects) maps generated Entity interfaces (suitable for DTOs) to a relational database via rendered SQL, reflection and JDBC Cursors where possible - avoiding associations.
"Versionable Store - OX" is a single-user Object Database written in Java. The basic API is simple and elegant to use on new projects or incorporate in existing projects for persistence support.
This project is no longer being pursued. There are several JDO impls undergoing development including OJB, XORM, TJDO, etc. Give them a try!
Sparrow is a high performance transparent persistence service (aka. Object Database) implementing the Java Dat