Which J2EE server for commercial use ?

I'm a bit new to all of this so please be gentle...
I'm currently learning all about J2EE by going through the tutorials provided by Sun (the bookstore, the bank etc). At the moment, I use the j2ee.exe program that comes with the SDK as my server.
My question is : when it comes to actually setting up a J2EE server for real-world use, would I still be using the same j2ee.exe or is this merely for test purposes and cannot take the strain of serious use.
If it is merely for testing and development, which j2ee servers are used out there in the big wide world ? I hear a lot spoken about Tomcat but don't know what it is.
I'd appreciate any comments about this. Although I can find lots of detailed knowledge about j2ee and server-side java in general, there seems to be very little information giving a general overview.
Thanks - Steve.

Funny cos' I was nearly gonna ask the same question myself but...One thing I know is that Tomcat is only the servlet implementation of J2EE and cannot run EJB's...this I know for sure... On the other hand, Application servers like IBM's Websphere or BEA's Weblogic can handle both Servlets and EJB's...but are quite costly....there exists an open source version called JBOSS (jboss.org) that is free and seems to be quite worth checking out...as far as j2ee.exe goes, I think it just supports basic EJB implementation on it's own and does not take care of security, transactions, persistence etc... like the expensive ones do..
did that help?
pkingsun2002

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