A little late for you maybe, but here is the info on how to use jamon with DataSources. I tested it with mysql on
tomcat. The only file you need to change is context.xml which can either reside in your web app in META-INF/context.xml or in the tomcat conf/context.xml file. context.xml is the only file you will need to change by putting in your own connection info (no changes need to be made to web.xml or server.xml).
One gotcha is that the context.xml file is also often copied into one of the tomcat directories (on my computer conf/Catalina/localhost/appname.xml). Delete this file if you change any info in the context.xml files. If you don't then the server may not see your changes and will be using the old file.
The attached context.xml defines 2 dataSources that use JAMon.