OpenEJB is a simple, lightweight Enterprise JavaBeans (EJB) container and server. You can embed OpenEJB in your own applications, or in a Web application server like Tomcat, or run it as a standalone EJB server. It supports EJB 3.0, 2.1, 2.0, and 1.1, and has partial support for EJB 3.1.
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Major new features include EJB 3.1 Singleton Support, EJB Constructor Injection, Spring Integration, and Multicast Client-Server Discovery. EAR-style classpath application discovery. System Property and InitialContext property overriding now applies to persistence-unit properties and logging levels. Special support for EclipseLink, TopLink, and Hibernate as JPA providers. Login/logout are now possible in an embedded scenario. A complete overhaul of all client/server connection management dramatically increases performance. Several new checks have been added to the Application Validation ruleset.