Given a generic interface

interface Foo<A, B> { }

I want to write an implementation that requires A to be a subclass of B. So I want to do

class Bar<A, B super A> implements Foo<A, B> { }
// --> Syntax error

or

class Bar<A extends B, B> implements Foo<A, B> { }
// --> illegal forward reference

But the only solution that seems to work is this:

class Bar<B, A extends B> implements Foo<A, B> { }

which is kind of ugly, because it reverses the order of the generic parameters.
Are there any solutions or workarounds to this problem?