Apache JDO, a project of the Apache DB project.
Java Data Objects (JDO) is a standard way to access persistent data in databases, using plain old Java objects (POJO) to represent persistent data.
Interfaces are defined for the user's view of persistence:
PersistenceManager, Query
... [More], Transaction
JDO is being developed as a Java Specification Request in the Java Community Process. The original JDO 1.0 is JSR-12.
The Apache JDO project is focused on building the JDO API and the TCK for compatibility testing of JDO implementations. [Less]
ZooDB is an object oriented database based on the JDO 3.0 standard. It is written by Tilmann Zaeschke. It is licensed under GPLv3 (GNU Public License), see file COPYING.
The PH-Tree is a multi-dimensional spatial index structure. It is a 'trie' version of a quadtree. Properties: no rebalancing, ever. Depth limited to 64 nodes. Fast updates, window queries and kNN queries. Scales very well with large datasets (10M+) and prefers clustered data over evenly distributed
... [More] data. PDFs with a description can be found in the source code. [Less]
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