1.6 language change(s) (or (unnecessary) bug fix?)

Question

Hi
Is this rather "Programming" or "JDK"?
Something changed for 1.6? That this compiles without problem on 1.5
public class Test {
    private abstract interface X {
        static abstract class Y {
            private abstract class Z {}
    private static abstract class A {
        private static class B extends Test.X.Y {
            private class C extends Test.X.Y.Z {}
    /** Creates a new instance of Test */
    public Test() {
     * @param args the command line arguments
    public static void main(String[] args) {
        // TODO code application logic here
}but on 1.6:
Test.java:24: an enclosing instance that contains Test.X.Y.Z is required
private class C extends Test.X.Y.Z {}
1 error

Answer 1

If it compiles on 1.5 and not 1.6 it may be a
regression bug or it may be a bug in 1.5 (to allow
it) that was since fixed.
Look here https://jdk6.dev.java.net/collaborate.html
and if you find it is a bug report it
http://bugs.sun.com/services/bugreport/index.jsp
I think 1.6 is correct, and this is a bug fix to 1.5.