I want to create the schema from Java Objects. But while defining a collection field as a foreign key(ManyOne relation), i want to specify the interface as type of collection, not the implemented Class.

@Entity
public class Roles {

@Id
private long idRoles;
private String role;
@OneToMany
@JoinColumn(name="testID")
@ForeignKey(name="FK_Test_TestId")
private List<ITest> test

}

I have two implementation for ITest - TestA and TestB

How to make hibernate aware of which interface implementation to pick up

I didn't get what is your problem here.
Specially this - I have two implementation for ITest - TestA and TestB
Can you please explain some more ?

And i use SET for a oneToMany join.
@OneToMany
@JoinColumn(name="testID")
@ForeignKey(name="FK_Test_TestId")
private Set<ITest> test {

}

Thanks Ajit for the response. Using List is my requirement. I can't use set. By ITest i meant Interface ITest. Though I think, its not possible in Hibernate to persist Interface implementations.