I need a little more info to help with your problem -
What build/configuration of the platform are you running? The pre-configured JBoss demo? Did you deploy the war to your own app server? Did you build it from source?
Many times the NoClassDefFoundError is misleading, it could be that the platform cannot find your solution path. Did you check your app server console for any errors on startup? Are there any errors in your server log? Can you send me your server log file?
we'll get you up and running soon!
Pentaho SME & Community Member