The following program doesn't compile:

The behavior is very counter-intuitive, but the compiler is behaving correctly - the underlying problem can be understood by looking at this simpler program (w/o enums):

class A {
   private int a = 1;

   static class B extends A {
      void test() { Object o = a; }
   }
}

However the following does:

class A {
   private int a = 1;

   static class B extends A {
      void test() { Object o = super.a; }
   }
}

This is counter-intuitive: if A.a can be referenced through super, why is A.a discarder during field resolution (I guess on the basis that 'a' is not a member of B) ?