5.3.0 / October 4, 2013
JOnAS is an open-source implementation of the Java EE application server specification, developed and hosted by the ObjectWeb consortium (ObjectWeb is a non-profit European consortium, founded by INRIA, Groupe Bull, and France Télécom). JOnAS is released under the LGPL open-source license.
Java EE Certification
JOnAS 5.1 is Java EE 5 certified, as of March 17, 2009. It was the first open-source server certified for free, using a process known as "J2EE scholarship" and established by Sun for non-profit organizations. The new JOnAS 5 architecture is based on top of an OSGi framework which makes the development of dynamic components much easier than before.
Java EE Environment
JOnAS is an open source Java EE 6 application server. It provides a fully compliant EJB container through EasyBeans and is available with an embedded Tomcat or Jetty web container. Any 1.6 JVM is supported, and the attempts to run on a free stack with GNU Classpath are very promising. JOnAS can run on numerous operating systems including Linux, Windows, AIX, many Posix platforms, and others, as long as a suitable JVM is available.
As of its version 5, JOnAS is fully based on the OSGi framework; using either Apache Felix, Eclipse Equinox or Knopflerfish (though the default JOnAS packaging comes with Apache Felix). This means that all JOnAS components are packaged as bundles, for example the full JOnAS profile comes with more than 250 bundles.
The service layer is implemented using Apache iPOJO, therefore most Java-EE-certified JOnAS services (persistence, EJB, resources, ...) are directly available as OSGi services to all OSGi bundles deployed on JOnAS. The inverse is also true: for example, an EJB3 can directly access any number of OSGi services using dynamic injection.