I am trying to use Hibernate to auto increment the id, however, I try to avoid duplication.

class Service
{
    Long id; // auto increment
    String name;
    String owner;

// setter and getter
}

What I want to achieve is, whenever name and owner are the same, it will be a duplicated entry. In this case, I don't want to add another entry into the Database anymore. How to revise the hbm.xml files to avoid this issue?