Best tools to monitor Tomcat
javasimon - Google Code Java Simon is a simple monitoring API that allows you to follow and better understand your application. Monitors (familiarly called Simons) are placed directly into your code and you can choose whether you want to count something or measure time/duration. News August 22nd, 2013 - version 3.4.0 released Slowly, but surely and proudly we are marching on - with another fixes + little features release.
JAMon - Documentation
MessAdmin - Notification system and Session administration for J