The example contains a view that submits competition registrations. The UI is similar to what you might have seen in Vaadin expo booth.
In addition this version submits the registrations to a JPA backend, validates the data automatically based on JSR-303 annotations in the domain object and also contains a view to list current submissions.
You can use it as a basis for your Vaadin experiments. To play around with the example, check it out using git or download the zip. Import it to your favorite IDE and execute the Application class or start the app from command line using:
git clone https://github.com/vaadin/registration-example.git
or
[email protected]:wallaceespindola/vaadin-spring-boot-data-registration-page.git
cd registration-example
mvn spring-boot:run
The application opens to http://localhost:8080
There is a tutorial about Creating CRUD UI with Vaadin at https://spring.io/guides/gs/crud-with-vaadin/ and for more complete Vaadin examples, visit http://vaadin.com/start