This seems like a pretty simple question, but I have not managed to find a definitive answer yet. I have a DAO class, which is naturally querying the database by using criteria queries. So I would like to know if it is safe to use the same CriteriaBuilder implementation for the creation of different queries or do I have to create new CriteriaBuilder instance for each query. Following code example should illustrate what I would like to do:

public class DAO() {  
    CriteriaBuilder cb = null;

    public DAO() {
        cb = getEntityManager().getCriteriaBuilder();
    }

    public List<String> getNames() {
        CriteriaQuery<String> nameSearch = cb.createQuery(String.class);
        ...
    }

    public List<Address> getAddresses(String name) {
        CriteriaQuery<Address> nameSearch = cb.createQuery(Address.class);
        ...
    }
}

Is it ok to do this?