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JKBS it's a production system: a knowledge based system written in java. You can store if-then rules (called production) and fact in its production memory and let the inference engine to produce some result.
A super-small embedded sub-relational database engine. No SQL just Java classes and methods; easy API. Great for business applications and environments with low resources. Check the Project-->Website & News below. Email me for help or post in the forum.
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MushroomDB is a pure Java multiplatform Relational Database Management System.
There are two main goals: to make a fully SQL-92 compliant engine and to provide extensibility mechanisms. A JDBC Driver and a GUI client is supplied with the engine.
An implementation (parser/interpreter) of SPARQL, a query language for RDF data that is the current recommendation of the W3C. Allows easy cusomization of the language and plugs in to several popular RDF servers, like Sesame.
Project MOVED to Codehaus New location is http://esper.codehaus.org The Esper project aims to provide a general-purpose event processing facility in Java for complex event processing of real-time, high throughput data streams.
JucaDB is a relational database engine written in Java, supporting a subset of ANSI SQL-92. There is a JDBC driver with full suport. Client-server, referential-integrity and other features are implemented.
myDbSearcher is a search engine for MySQL Databases. It is written in Java. It scans several tables on different databases. A XMLRPC-Server will give you access to the Index.
Currently it runs on http://www.idowa.de/ueberblick/suche/index_html
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XQEngine is a Java component for searching collections of XML documents that uses an XQuery front end. The engine has a straightforward API that allows it to be easily embedded in end user applications. Requires some basic Java programming skills.
Gemello is a relational database written in pure Java. Its design is aimed at teaching. If you're searching for a fast relational engine, Gemello won't be a good choice. Is's rather a good and simple example of relational database implementation.
TM4J is a topic map engine implemented entirely in Java. Topic maps are a standard paradigm for the interchange of knowledge structures. This project aims to produce a complete suite of tools for creating, processing and publishing topic map information.
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.
JETHRO (JavaEngine 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 goal of this project is to develop a modular SQL engine (JDBC driver) that can be grafted onto any raw database (such as a large flat ASCII file) through a database module API. Writing database drivers is much easier that writing a whole RDBMS.
This project tries to define a new grammar to be used for database access. It should be easier to learn, understand and use than SQL, be more consistent, and contain significantly less rules. It does not try to be an extension or subset of SQL.
LeverPack is a small, transaction based, secure, concurrent, and efficient record repository management engine written in Java. It provides READ_COMMITTED transaction isolation level supported read/write access to user data records.
Java Data Engine API. Why not (try to!) forget data distribution and management headaches in distributed environments. Ready to start examples included.
XML database engine for mobile devices (iPaq, Palm, etc.). The core of the system is Java based, this way it makes it portable and able to run on different systems. It's very lightweight and runs on devices with little memory and storage place.
[RETIRED] Tornado/DB is an object-relational mapping engine for Java. Features
include object caching, multi-table inheritance, compound keys, relationships, XML config., JSP tags, small footprint.
NLucene is the .NET implementation of the Lucene high-performance, full-featured text search engine written in Java. See http://jakarta.apache.org/lucene for more info on Lucene.
zTable is a mini-DBMS written in Java. It has 2 parts: a back-end DBMS engine and a front-end Eclipse editor plugin. The engine can be embeded in any Java application. The Eclipse editor can be useful as a free DBMS for end-users.