Good Application Servers? Struts? what to do....

Hi all I am currently charged with looking for application servers for my employer. Currently I was playing with JBoss 3.0.4, and it seems kind of cool I really like the ant and xdoclet that it uses. But we don't plan on using EJBs right now, so my question is, when do you need an application server? We don't have one now, all our pages are just on Tomcat. If we should get one what are the benefits, and which ones are good?
Also about Struts, I was wondering if anybody uses sturts, I have read the docs, and it sounds like an interesting way of doing things, but I want to know what others thought about it. So any thoughts?
Pup

There is no need to implement something complex only if you vaguely feel that it will help you in the future.
The best thing would probably to quantify what your future requirements will be. Then you can determine whether you need to really take the EJB route. While EJB has been the most hyped up technology (at least till Web Services came along), there have been serious performance issues when EJBs have not been used appropriately for questionable reasons or improperly designed.
Of course you can always download an AppServer for free and develop prototypes/proof of concepts to understand them better and to determine whether they offer any significant advantage to you before deciding to reengineer your entire application.
I came across an excellent book from WROX press titled J2EE Design and Development: Expert One on One. There is even a sample chapter available at their site. This chapter gives a fairly good initial idea of whether you need EJBs for you application or not. See the following link:
http://www.wrox.com/books/1861007841.htm
http://www.wrox.com/books/sample-chapters/SampleChapter_1861007841.pdf

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Hi Victor
I haven't worked with EnterpriseOne but i have been heavily involved with an Oracle ERP implementation in our data centre. This involves mid-tier appliction servers talking to back end database servers with load-balacing and firewalling involved. There is quite a bit to cover in your post so please come back if needed.
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There are a number of ways to do this. Obviously you connect each server to two different switches. You can run NIC's in active/active mode or active/failover. You can use the same IP address for both NIC's or you can have separet IP's.
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Lets say for arguments sake you only need to allow ports 80 & 443 through to your mid-tiers. Very easy to firewall. But if you also run your management software on the data NIC's you now have to add in those ports as well and believe me, a lot of server management software was not written with firewalls in mind.
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http://www.cisco.com/en/US/netsol/ns656/networking_solutions_design_guidances_list.html#anchor3 **

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Good Application Servers? Struts? what to do....

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