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No matter, adding OpenEJB to Tomcat gives Servlets several new Java EE 5 capabilities such as JPA, JAX-WS, JMS, J2EE Connectors, transactions, and more as well as enhancing the injection features of Tomcat 6 to now support injection of JavaEE objects like Topics, Queues, EntityManagers, JMS ConnectionFactories, JavaMail Sessions, as well as simpler data types such as Dates, Classes, URI, URL, List, Map, Set, Properties, and more. In the case of Tomcat 5.5 which doesn't support dependency injection at all, even more is gained.

Runs on OSGi

All OpenEJB 3.0 binaries come with complete OSGi metadata and are usable as a bundle in any OSGi platform. Look for OpenEJB in the upcoming, OSGi-based ServiceMix 4 which is built on Apache Felix.

CMP via JPA

Our CMP implementation is a thin layer over the new Java Persistence API (JPA). This means when you deploy an old style CMP 1.1 or CMP 2.1 bean it is internally converted and ran as a JPA bean. This makes it possible to use both CMP and JPA in the same application without any coherence issues that can come from using two competing persistence technologies against the same data. Everything is ultimately JPA in the end.

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