Java(TM) Data Objects (JDO) Specification - The Proposed Final Draft of the JDO 1.1 specification for object-relational mapping on the Java platform. TriActive JDO (TJDO) - Implementation of Sun's JDO specification (JSR 12), designed to support transparent persistence using any JDBC-compliant database. [Open source, Apache Software License] ONJava.com: "Castor JDO": Simply False Advertising - This expert perspective lays it on the line: Exolab's Castor JDO product does not support the JDO standard. ONJava.com: Using Castor JDO for SQL Mapping - An in-depth look at using Castor's marshalling engine to do data binding of Java objects to tables, rows, and columns in an SQL database. XORM (Extensible Object-Relational Mapping for Java) - Provides interface-based persistence to RDBMSs while allowing developers to focus on the object model, not the physical layer. It implements many of the interfaces specified by JDO. [Open source, GPL] Persist data with Java Data Objects, Part 2 - This article presents two major JDO specifications: the Sun Microsystems JDO and the open source Castor JDO. Jacek Kruszelnicki discusses their relative pros and cons, and their similarities and differences. Persist data with Java Data Objects, Part 1 - Jacek Kruszelnicki discusses the issues encountered with persistence, presents traits for an ideal persistence layer, and reviews available JDO solutions. ONJava.com: Flawed Understanding of JDO Leads to FUD - In this scathing response to Don Bales' recent critique of Java Data Objects, David Jordan offers proof that JDO does not regard SQL as a bad thing, yields shorter and simpler code, and is vendor-neutral. ONJava.com: Flawed JDO Points the Way to the "Objectbase" [Apr. 24, 2002] - Java Data Objects (JDO) is neither a silver bullet nor without merit. But its most important contribution may be to wake developers up to the coming paradigm shift: from database to objectbase, a place where not only data but data and behaviors are stored... Castor - Integrates Java objects, XML documents, SQL relational databases and LDAP directories in a unified model that allows information to be exchanged, persisted and manipulated in a variety of ways. Supports JDO. [Open Source, BSD-like] TheServerSide.com: Simplifying Domain Model Persistence in a J2EE application by using JDO - By Chris Richardson. Learn how to use Java Data Objects (JDO) to accelerate development and test domain model outside of the application server and without a database. Java Data Objects (JDO) - A home page for JSR-000012, Java Data Objects.