Java JPA2：我使用JoinColumn作为queryparam来创建查询，但出现了异常，为什么

此代码来自实体bean 我使用want\u uid作为queryparam编写了一个查询。如下所示：

    @JoinColumn(name = "want_uid", referencedColumnName = "id")
    @ManyToOne
    private BookUsers wantUid;
    @JoinColumn(name = "sale_uid", referencedColumnName = "id")
    @ManyToOne
    private BookUsers saleUid;
    @JoinColumn(name = "book_id", referencedColumnName = "id")

发生异常：

 BookUsers bookUsers=userDA.findUserByID(wantID);
 Query query= em.createQuery("SELECT b FROM BookOrder b WHERE b.want_uid = :want_uid");
 query.setParameter("want_uid", bookUsers);

我找不到原因。。。 你能告诉我吗？ 在查询中感谢

javax.servlet.ServletException: java.lang.IllegalArgumentException: An exception occurred while creating a query in EntityManager: 
Exception Description: Error compiling the query [SELECT b FROM BookOrder b WHERE b.want_uid = :want_uid], line 1, column 34: unknown state or association field [want_uid] of class [com.xbook.entities.BookOrder].

需要改成

b.want_uid

所以

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哇…谢谢！问题很奇怪…JoinColumn的名称是want\u uid..为什么不是queryparam？您是否尝试过使用

query.setParameter（“want\u uid”，bookUsers.getId（））？
b.wantUid

SELECT b FROM BookOrder b WHERE b.wantUid = :want_uid