Set<Student> students = new HashSet<Student>();在带脚手架的GUI中,我可以为学生分配多个课程,但是当我试图为学生分配课程时,我会得到以下错误:
org.hibernate.WrongClassExceptionid: null不属于指定的子类:com.company.Student(给定对象的类不匹配持久副本类);嵌套的异常是javax.persistence.PersistenceException: org.hibernate.WrongClassException