Is it worth to study languages on the JVM without knowing Java?
tomjen2: Java really isn't that difficult (I assume that you know OOP, otherwise you might need to study that first), there isn't that much to it (in fact Java is pretty famous for not having much syntactic sugar).What you will properly need to learn to use is the class hierarchy, Swing programming (if you want GUIs, you should take a look at MIGLayout) and the classpath (which you will have to deal with, regretfully).