Debugging Xtend is straight forward. On a normal JVM you can even switch between generated Java and original Xtend source during debug, depending on what level you would like to step through. On Android you need to decide using a compilation flag whether you want to step through the generated Java or the original Xtend source. This is because Dalvik doesn't support JSR-45 which Xtend uses by default. So it basically just works.