Reminds me of this old joke:
Some people, faced with a problem, think: "I know, I will use regular expressions." Now they have two problems.
It seems that you have several things that you do not know: Eclipse, Tomcat, Java EE, possibly JSP, JSTL, WAR files, the list goes on.
My advice would be to split things into bare bones and decompose the problem a bit.
Start with a simple servlet / JSP application that talks to the database without using Eclipse. See if you can compile on the command line, create a WAR file, package it correctly and deploy it to Tomcat.
If you can do this then run Eclipse in the mix. Don't worry about running Tomcat inside Eclipse. You can go back and forth until the IDE is comfortable.
But you ask a lot when you say that you need step-by-step instructions. You are solving a very big problem.
duffymo
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