如何让spring data jpa调用entityManager.persist(…)保存过程中的方法？

import org.springframework.data.jpa.repository.JpaRepository;
import org.springframework.stereotype.Repository;

@Repository
public interface UserRepository extends JpaRepository<User, Long> {
    void saveUser(User user);
}

import org.springframework.beans.factory.annotation.Autowired;
importimport javax.persistence.EntityManager;
import org.springframework.stereotype.Repository;

@Repository
public class UserRepositoryImpl implements UserRepository {

    private final EntityManager entityManager;

    @Autowired
    public UserRepositoryImpl(EntityManager entityManager) {
        this.entityManager = entityManager;
    }

    @Override
    public void saveUser(User user) {
        entityManager.persist(user);
    }
}