This week's book giveaway is in the OCAJP 8 forum. We're giving away four copies of OCA Java SE 8 Programmer I Study Guide and have Edward Finegan & Robert Liguori on-line! See this thread for details.
Stupid question here, but you are having JConsole connect to the correct Process ID PID for your running Tomcat where that app is deployed? Also under the mbeans tab, remember the name you use in @ManagedResource. To there would be a menu option on the left titled "bean" The last thing there threw me off the first time I went looking for my mbeans in JConsole.
Other questions are you sure that the app is deployed and running?