I had a real hard time figuring out where to put JSP so you could view them with tomcat/ jboss
I think and informative exercise for others having a similar problem and getting the new context specified errors is to make a copy of the jmx-console.war folder which is in JBOSS/server/default/deploy
and rename it to "whatever" and in this new folder make changes to the index.jsp than
goto localhost:8080/whatever/
and you will see the new index page
this is kind of stupid but after I did it I felt less lost I hope it helps someone else
