The following code compiles using JDK6 (I tried 1.6.0_24)

class XY<A extends XY<A, B>, B extends XY<B, A>> { }

But compiling under JDK7 (e.g. 1.7.0), I get this error:

XY.java:1: error: type argument B is not within bounds of type-variable A
class XY<A extends XY<A, B>, B extends XY<B, A>> {
                                      ^
  where B,A are type-variables:
    B extends XY<B,A> declared in class XY
    A extends XY<A,B> declared in class XY
1 error

Can anyone point as to whether this was an intentional change to Java's generics?

java generics types
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