There are a huge set of web frameworks in Java that have the same example as shown on this site; I have no idea how this differs from, say, <a href="https://ratpack.io" rel="nofollow">https://ratpack.io</a> or <a href="https://sparkjava.com" rel="nofollow">https://sparkjava.com</a>. This really needs some key features on the site to sell it.
It’s always nice to see full-stack, batteries included frameworks. However, whenever I see Java, I can’t help but think about Oracle and it turns into a very unpleasant feeling.