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This is a Video Tutorial explains How to access the GAE user service and datastore | how to use jQuery for formatting and ajax transactions ?
The example application given in this page illustrates one way to construct Java-based Google App Engine applications. It also illustrates how to use jQuery for formatting and ajax transactions. This application provides an example of persistence in which it stores data in a database that persists through restarts of the application. In this example, the id of the logged-in user will be used as a key to access records that the number of times the user accesses a Java servlet.