Now we're back to the familiar refrain--our application is finished. What have we covered in the chapter? We've created a REST API using JAX-RS that doesn't require direct JSON manipulation. We've learned how to apply request filters to JAX-RS endpoints to restrict access to authenticated users, which we authenticate against their Google accounts using Google's OAuth2 workflow. We've packaged the application using Payara Micro, a great option to develop microservices, and we've integrated MongoDB into our application using the MongoDB Java API. Finally, we built a very basic JavaScript client using Vue.js to access our application.
There are a lot of new concepts and technologies interacting in this application, which makes it interesting from a technical perspective, but there's still more that could be done. The application could use a great deal of styling, and support for embedded images and videos would be nice, as would a mobile client. There is lots of room for improvements...