http://www.jboss.org/file-access/default/members/jbossas/freezone/docs/Installation_And_Getting_Started_Guide/5/html/EJB3_Caveats.html#d0e2904

"The EJB3 plugin injects references to an EntityManager and @EJB references from one EJB object to another. However this support is limited to the EJB3 MBean and the JAR files it manages. Any JAR files which are loaded from a WAR (such as Servlets, JSF backing beans, and so forth) do not undergo this processing. The Java 5 Enterprise Edition standard specifies that a Servlet can reference a Session Bean through an @EJB annotated reference, this was not implemented in JBoss Application Server 4.2.2. "

this guide is for version 5 not 4.2.2. Fairly sure the statement is false when revised to 5.0 as well.