You can run Tomcat5 with
JDK 6. Although there's been talk about a Tomcat that runs under just a JRE, as far as I know, they all still require the full JDK.
This isn't Microsoft where version dependency breakage is an ordinary part of life.
Java was expressly designed to support backwards compatibility.
It's not a bad idea to move to Tomcat6, though. There's relatively little trauma in moving from TC5.5 to TC6.
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.
