JBoss AS 4 is an officially certified J2EE 1.4 application server. The
certification guarantees that JBoss AS 4 conforms to the formal J2EE
specification.

- supports J2EE Web Services including JAX-RPC (Java API for XML for 
Remote Procedure Call) and the Web Services for J2EE Architecture.

- implements the JMS (Java Messaging Service) 1.1 specification.

- implements the JCA (Java Connector Architecture) 1.5 specification. 
The JCA 1.5 specification adds support for the life cycle management of 
resource adapters, worker thread management as well as transaction and 
message inflow from the resource adapter to the application server.

- implements the Java Authorization Contract for Containers (JACC) 
specification.

- implements the EJB 2.1 specification. The EJB 2.1 specification 
extends the message-driven bean contracts to support other messaging 
types in addition to JMS. It supports stateless session beans as web 
service endpoints. It also includes a new container managed service 
called the EJB timer service.

WWW: http://www.jboss.org/