Some of javac messages are a little out. foreach is still referred to, even though it hasn't been a keyword for some time (a better fix would be to reintroduce it). Also:

Proxy.java:1: unexpected type
found : I
required: class
interface Proxy<I> extends I {

I understand, roughly, why the above isn't supported, but it requires an interface not a class in place of the type parameter, I.

enum En {
    Um {
        void notFn() { }
    };
    abstract void fn();
}


-Xlint:unchecked is too harsh for an awful lot of code. Generics EA 2.2 -warnunchecked did better. Consider the following code implementing part of the Set interface.

    public boolean remove(Object o) {
/* if (!(o instanceof E)) { //!!
            return false;
        }*/
        boolean removed = set.remove(o);
        if (removed) {
            fireSetChanged(
                null,
                SetDataEvent.Type.ELEMENTS_REMOVED,
                Collections.<E>singleton((E)o)
            );
        }
        return removed;
    }