FusionDebug is a certified debugger for Railo and lets you see what's happening
in your application as each line of code is being executed. It can be used to set
breakpoints, step over, into, or out of code, inspect variables (across different
scopes), and watch expressions. FusionDebug integrates with the Eclipse IDE.
Download and read more here - http://www.fusion-reactor.com/labs/fd_railo.cfm