hibernate一对多映射时异常Illegal attempt to map a non collection as a @OneToMany, @ManyToMany or @Collection

      异常信息：  org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'hibernateTemplate' defined in class path resource [spring/applicationContext-db.xml]: Cannot resolve reference to bean 'sessionFactory'
while setting bean property 'sessionFactory'; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'sessionFactory' defined in class path resource [spring/applicationContext-db.xml]: Invocation of init
method failed; nested exception is org.hibernate.AnnotationException:Illegal attempt to map a non collection as a @OneToMany, @ManyToMany or @CollectionOfElements: com.PLCmonitor.domain.CraneQueryTimes.users

      解决方法：private ArrayList<User> user=new ArrayList<User>();换成private List<User> exams=new ArrayList<User>()；