Russ Michaels wrote a blog post explaining some tweaks he needed to do in order for the SEO urls to run under Tomcat.
Read the whole post at Russ' blog.
In version 1.5, I cut down the amount of logging stored when a plugin has an error. Adam Tuttle explains how to enable additional information to be logged when you are debugging a plugin or an error. Read at Adam's blog.
One problem people had when using Mango on Railo on Tomcat is that they need to change the settings to not use friendly URLs. That also happens with ColdFusion if you are using it on top on Tomcat.
Indiver Nagpal describes the changes you need to make to make it work with the default friendly URLs.