Enterprise Java Beans...

JavaBeans -> Reuseable Software Components

Der er 3 konkurrerende Open Source EJB containere:
Jonas (Enhydra)
http://www.bullsoft.com/ejb/
OpenEJB
http://www.openejb.org/
JBoss
http://www.jboss.org/
Kommercielle
IBM Websphere
BEA