What I don't see a lot of mention here is database selection. If you really need an Object->? mapping, why not just use a document store or the like? I don't

What I don't see a lot of mention here is database selection. If you really need an Object->? mapping, why not just use a document store or the like? I don't know how many remember but in the earlier days of Java everyone was talking about OO-databases. I think they didn't work out because they tended to be language specific but now you could serialise your object tree to JSON and store it in a document store if you wanted to.