Ask HN: Java web applications

Hi there, i have been building web applications using Ruby, Python, Go, PHP... you name it. I wanted to give Java a shot.

So i was researching the Java world and i am somewhat confused. A quick google search returns web frameworks like Spark, Play, Dropwizard... and then there is a ton of $SeriousEnterpriseBusinessStuff where i absolutely can't find where to begin with.

So. What are some commonly used concepts for developing web applications in the Java ecosystem? What else should i know before i get started?