执行批处理更新时，java PostUpdate挂钩不起作用

Question

我正在与JPA/Hibernate合作

我正在进行批量更新：

代码片段：

@PersistenceContext
private EntityManage entityManager;

   ...
private int update(StudentEntity studentEntity){
 CriteriaBuilder builder = entityManager.getCriteriaBuilder();
 CriteriaUpdate<StudentEntity > criteria = builder.createCriteriaUpdate(StudentEntity.class);
 Root<StudentEntity> root = criteria.form(StudentEntity.class)
 setFields(criteria, root, studentEntity)
 criteria.where(builder.equal(root.get("studentId"), studentEntity.getStudentId()));
 return entityManager.createQuery(criteria).executeUpdate();
}

private setFields(CriteriaUpdate<StudentEntity> criteria,  Root<StudentEntity> root,StudentEntity  studentEntity){
 criteria.set(root.get("studentName"),studentEntity.getStudentName());

 ....
}

在执行上述代码时@PostUpdate钩子没有被调用，为什么

@PostUpdate
private update (StudentEntity studentEntity){
  System.out.println("@PostUpdate called.");
}