See this
thread:
JavaRanch: Mac OS 10.3.6 and J2EE, DB, Servlets... You may also find articles over at the Apple Developer Connection useful, such as this one:
Enterprise Java on Mac OS X
The OS X developer tools include
JBoss 3.2.x which gives you what you need, and the ADC site has some stuff on setting up
Tomcat within OS X. Either way, you have a J2EE compliant system at your beck and call, you just need to switch a few things on.