一对多关系条件查询问题

class Department {

? String name;

? List<Employee> employees;

}

?

class Employee {

? int age;

}

?

DetachedCriteria?criteria?=?DetachedCriteria.forClass(Department.class)

?

criteria?.add(Restrictions.eq("name",?"department"))

criteria?.createAlias("employees",?"e").add(Restrictions.eq(("e.age"),?new?Integer(20)));????

?

Department和Employee为一对多关系，查询某个部门下员工年龄为20岁的

?