Java is used in all sorts of places. If you're only familiar with lets say, writing Java desktop or console applications (Java SE) I can imagine this stuff look

Java is used in all sorts of places. If you're only familiar with lets say, writing Java desktop or console applications (Java SE) I can imagine this stuff looking a bit alien. But if your doing web and enterprise development in Java (Java EE) it's pretty common to use Spring, Maven and the likes.