If you ask yourself why that matters, take a look at the play frameworks(www.playframework.org) domain models. They use hibernate, wich implements the JPA spec(

If you ask yourself why that matters, take a look at the play frameworks(www.playframework.org) domain models. They use hibernate, wich implements the JPA spec(JSR 220) as ORM. When 1.1 is out and scala support is in, you don't even have to use java any more. But the JPA implementation patterns should be as useful as for java. Besides that, the article collection could be a good resource on general ORM-Problems, but i don't know that for sure.