Hi there,
There are some significant differences with how resources such as
JDBC drivers are treated between those versions of
Tomcat, for example
this page talks about changes between 5.0.x and 5.5.x, there will be similar documentation for the upgrade from 5.5.x to 6.0.x.
I assume you're stuck with that provider? It might be an idea to switch to a provider with a more up to date Tomcat instance (more secure for a start).