HQL如何检查从外部输入的集合中是否存在对象？

Question

我有以下内容：

   ***Homework.class***
    id;
    name;
    @ManyToOne(fetch = FetchType.LAZY, cascade = { CascadeType.MERGE,
                CascadeType.PERSIST, CascadeType.REFRESH, CascadeType.REMOVE })
        @JoinColumn(name = "lesson_id", referencedColumnName = "id", nullable = false)
    Lesson lesson;
    @ManyToMany(mappedBy = "studentHomeworks", fetch = FetchType.LAZY)
    @Cascade(org.hibernate.annotations.CascadeType.ALL)
    private Set<User> homeworkStudents;

    ***Lesson.class***
    id;
    etc;
    @OneToMany(mappedBy = "lesson", fetch = FetchType.LAZY, cascade = CascadeType.ALL)
    private Set<Homework> lessonHomeworks;
        @ManyToMany(mappedBy = "studentLessons", fetch = FetchType.LAZY)
        @Cascade(org.hibernate.annotations.CascadeType.ALL)
    private Set<User> lessonStudents;

    ***User.class***
    id;
    etc.;
    @ManyToMany(fetch = FetchType.LAZY, cascade = { CascadeType.MERGE,
                CascadeType.PERSIST, CascadeType.REFRESH, CascadeType.REMOVE })
        @JoinTable(name = "oys_lesson_student", uniqueConstraints = @UniqueConstraint(name = "uq_student_lesson", columnNames = {
                "student_id", "lesson_id" }), joinColumns = { @JoinColumn(name = "student_id", referencedColumnName = "id") }, inverseJoinColumns = { @JoinColumn(name = "lesson_id", referencedColumnName = "id") })
    private Set<Lesson> studentLessons;
    @ManyToMany(fetch = FetchType.LAZY, cascade = { CascadeType.MERGE,
            CascadeType.PERSIST, CascadeType.REFRESH, CascadeType.REMOVE })
    @JoinTable(name = "oys_student_homework", uniqueConstraints = @UniqueConstraint(name = "uq_student_homework", columnNames = {
            "student_id", "homework_id" }), joinColumns = { @JoinColumn(name = "student_id", referencedColumnName = "id") }, inverseJoinColumns = { @JoinColumn(name = "homework_id", referencedColumnName = "id") })
private Set<Homework> studentHomeworks;

我尝试过这样的事情：

query = "select h from Homework h where h.stop_time > :now and h.lesson in elements(:lessons)"

没有在元素关键字中设置参数功能。所以我该怎么做？我想为已注册课程的用户提供作业。我从outside.how输入已注册的课程以检查是否有对象（课程）来自家庭作业的对象）存在于从外部输入的集合（用户注册的课程）中？