Reference Doc doesn't mention java.util.Set among query return types

[jourteen]

There is no mention of java.util.Set in Repository query return types, but definitely it is supported (at least by Spring Data JPA).

[mp911de]

This is intentional. While CollectionToCollectionConverter can convert to all sorts of collections, we do not want to promote Set usage, as we generally assume stable orders, specifically expressed through List return types. Anything other than that can work in certain arrangements and with other assumptions, yet we do not want to call out that support specifically as it can easily lead into false assumptions.