What is the difference between JBoss, Catalina and Tomcat?

[gompol]

I am getting confused with all the terms? Can someone tell me in simple english what each one is? I read the FAQs on Google but they sound the same thing yet different.

Thanks,
gompol

[Belisarius]

Catalina is a term used for Tomcat. Unless you're talking about the nitty-gritty details, just call it Tomcat.

JBoss is a different implementation of Sun's J2EE protocols/API. You're right, same but different.

[technobard]

Also, Tomcat serves up JSP / Servlet stuff. JBoss is most known for supporting the EJB portion of the standard. JBoss has expanded to include other things like message queueing.

[jeffro]

JBoss uses Tomcat to serve up JSP/Servlet content. You could use Jetty if you didn't want to use Tomcat. JBoss really just bundles up everything you need to have a full enterprise level java-based webapp server.