Play2 How to manage the transaction from the service layer instead of action layer?

Question

I am using Play2.1.1 Java with JPA2.0 with hibernate implementation.

to control the transaction by code instead of using @transactional like below is the normal JPA

Answer 1

something like this:

public static User getUserByIdentity(final AuthUserIdentity identity) {
    try {
        return JPA.withTransaction(new play.libs.F.Function0() {
            public User apply() {       
                return User.findByAuthUserIdentity(identity);
            }
        });
    } catch (Throwable t) {
        throw new RuntimeException(t);
    }       
}