Interactive debugging
Interactive debugging with the Sysdeo Tomcat Plugin
Some uPortal developers use the SysDeo Tomcat Launcher plugin
It can start/restart/stop Tomcat from buttons in Eclipse, automatically configures debugging and does its best to do hot-deploy (though some turn this off as they find it causes more problems than it solves). uPortal developers have been using it since the beginnings of using Eclipse with uPortal and are still using it with Eclipse 3.3.