For EJBs, you need an EJB server. Some EJB servers such as JBoss and, I think, Sun App server, become fully fledged J2EE servers by incorporating Tomcat to process JSPs and servlets.
SCJP 1.4, SCWCD 1.3, SCBCD 1.3
He puts the "turd" in "saturday". Speaking of which, have you smelled this tiny ad?
a bit of art, as a gift, the permaculture playing cards