Java Application Servers Apache

• Apache DB Project  - Details on the ObjectRelationalBridge mapping tool, its flexibility, scalability and functionality. Provides releases notes, downloads, coding standards, and references.
• Apache Geronimo  - Aims to generate a server run-time framework for open-source substitutes. Contains recent releases and activities, FAQs, source codes, sample applications, Javadoc and other related projects.
• Covalent  - Enterprise support company that provides consulting, migration and training services. Includes software subscriptions of the Enterprise Ready server, Hyperic HQ, WSO2 web services and Terracotta clustering.
• O’Reilly On Java: Object-Relational Mapping with Apache Jakarta OJB  - Article that focuses on OJB’s incorporation to Java 2 enterprise edition containers. With example codes for illustration.