Thanks Tigran!

I think that it's always depends on the problem that needs to be solved, how big and complex an application will be. For simplicity I would not mind to add javax.persitence imports either to domain models or to outgoings, at least in the first step, just not to over complicate the system.

For me at least, that's not such a big issue, as most of JPA dependencies are annotations which will not affect of a class behaviour as they just decorator. Yes, they will be not necessary and might bring some confusion in future.

But I would be happy to hear what's your opinion on that :)