Continue existing CRUD web application in JAVA

I need to finish work on a small web application that is already half baked. There is some UI work to do and some JPA. The development must be done using the existing frameworks , It uses Spring, EclipseLink, Spring-data and hsqldb in the backend and jqGrid and query for the client side. The attached zip contains the current snapshot of the code based on some example. The app contains these Entities and Relations: Product -> many licenses License -> many registrations. Client-> many registrations. Product->many registrations. Each license has a unique string - license key. Required Pages, some are half implemented: 1. List of products. 2. List of Clients. 3. List of registrations. 4. List of registrations per client. 5. List of Licenses per client. 6. List of registrations per license 6. A page to manually add a registration. Allowing the user to choose a client, enter his name, his license key and his id, and create a new client instance with this name. And on submit, create a new generated registration object and display it on the screen, this is done by invoking an existing method in the controller. Each controller should use a service do do the operations, use existing entityManager, no direct SQL commands. The search and sorting should be implemented for each CRUD. There is a sample authentication switcher that should be removed.