Continue existing small 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 zip file attached contains the existing code. it's a self contained maven project. Please take a look at the project before bidding. 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.