You might like to use traditional Java logging to a file then read the file or pass it thru a graphic tool like gcviewer from www.tagtraum.com/gcviewer.html .
Enable JMX then use JDK tools like jconsole and jmc are also useful to know how the CF Java is going in a graphical tool. Those tools also help you to know how the tomcat AJP connector is running.
Many here may recommend try Fusion Reactor.
If you have Enterprise you might like to use CF Monitor.
Hope those idea's help, Carl.