As you know I prefer Scala. However I recently put together these videos on how to create a simple web application using Java 8 + Play Framework 2.5.x. A scala version may come in the future. There is also accompanying code and reference material.
Part 1 – JSON Web Service (8 1/2 minutes)
Part 2 – Add database lookup (12 1/2 minutes)
Part 3 – Simple UI