"Notice the use of dash in the :require but the use of underscore in the :import. This is because the :import is a Java import used for Java classes, and we must refer to our SchoolBus record as a Java class."
Just like how monads are burritos, apparently Clojure is a coffee cup with a hole in it - it's leaked Java all over the place. ;)
There is some leaky Java, and it can be painful at times.