you have to define a module in your jboss. Please refer to the following guide:
Next, you have to define a jboss deployment structure file for your application (https://docs.jboss.org/author/display/AS7/Class+Loading+in+AS7), in order to point your application to the newly created module.
thanks you , by the way the lib folder under standalone folder is for what purpose?
I thought can move my app from tomcat to AS7 , but look harded..