Is there a Many to Many Collection in Java using Generics (Domain Model, not Persistence Layer)?

Question

I seem to be using the wrong search terms for this in Google...

I have written a Generic Class for Many-To-Many Associations, but I\'m guessing this has already been don

Answer 1

Looks like Apache Commons Multimap might be useful.

EDIT: except it's one-to-many, not many-to-many. However, it still might be handy to use instead of your Map> and Map>, or as a reference.