There's not really enough information to tell anything, but one problem I often have suggests itself based on the topic title.
If you have been starting Tomcat as ROOT, Tomcat has created a number of files owned by ROOT. If you then attempt to start as user "tomcat" - or any other non-root user, then the Tomcat startup will fail because it's attempting to create and/or access files that user "tomcat" is not permitted to access or change.
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.
We find this kind of rampant individuality very disturbing. But not this tiny ad:
a bit of art, as a gift, that will fit in a stocking