Maven-Spring запросы к БД

public class CarDaoImpl implements CarDao {
    @PersistenceContext
    private EntityManager emf;
 
 
    public void update(Car car) {
        emf.merge(car);
    }
 
    public void delete(Car car) {
        emf.remove(emf.getReference(Car.class, car.getId()));
    }
 
    public Collection<Car> getCars(String search) {
        if (null == search || search.trim().isEmpty() ) {
            return emf.createQuery("select c from Car c").getResultList();
        }
        return emf.createQuery("select c from Car c where c.name like :search").setParameter("search", search.trim() + "%").getResultList();
 
    }
 
    public List findByCar(String name, Long price) {
        return emf.createQuery(
                "select c from Car c where c.name = :name and c.price = :price")
                .setParameter("name", name)
                .setParameter("price", price)
                .getResultList();
    }
 
    public void add(Car car) {
emf.persist(car);
    }
}

search.trim().isEmpty()

        return emf.createQuery("select c from Car c where c.name like :search").setParameter("search", search.trim() + "%").getResultList();