You can use the "run on server" menu option if you're using the WTP plugin supplied with the
j2EE spin of Eclipse.
Personally, I loathe WTP - it's far too limiting, So I install the sysdeo Tomcat plugin. Sysdeo adds 3 toolbar buttons and associated menu options, one to start Tomcat, one to stop Tomcat and one to restart (start/stop).
The secret of how to be miserable is to constantly expect things are going to happen the way that they are "supposed" to happen.
You can have faith, which carries the understanding that you may be disappointed. Then there's being a willfully-blind idiot, which virtually guarantees it.