Spring Data JPA的低级错误

//课程表
@Entity
public class Class {
    @GeneratedValue(strategy = GenerationType.AUTO)
    @Id
    private Long classID;// 课程编号             varchar(20) not null,
    private String className;// 课程名称          varchar(50),
    @Temporal(TemporalType.DATE)//(精确到年月日)
    private Date beginTime;//  开始时间         date,
    @Temporal(TemporalType.DATE)//(精确到年月日)
    private Date endTime;//结束时间             date,
    private String classInfo;// 课程简介          text,
    private double price;// 价格               numeric,
    private int times;// 课时数               integer,
    private int classMan;// 课程人数            int,

    @ManyToOne(cascade = CascadeType.ALL)
    private Teacher teacher;//主教练         varchar(20),


    @OneToMany(cascade = CascadeType.ALL, fetch = FetchType.LAZY, mappedBy = "class_")
    private List<Lesson> lessons;
//...省略getter和setter方法

public interface ClassRepository extends JpaRepository<Class,Long> {

    @Query(value = "SELECT * FROM class WHERE classid=:ID",nativeQuery = true)
    Class findClassByID(@Param("ID")Long ID);

    @Modifying
    @Transactional
    @Query(value = "UPDATE class SET times=:times WHERE classid=:classid",nativeQuery = true)
    void updateClassTimes(@Param("times")int times,@Param("classid") Long classid);


    @Query(value = "  select * FROM class where  DATE_FORMAT(begin_time,'%Y%m%d') >=NOW()",nativeQuery = true)
    List<Class> findClassByAfter();

    @Query(value = "  select * FROM class where  DATE_FORMAT(begin_time,'%Y%m%d') <NOW()",nativeQuery = true)
    List<Class> findClassByBefore();

    Page<Class> findByBeginTimeBefore(Date date,Pageable pageable);

}

如果实体类里面属性名开头用大写字母，

在JPA中就不能通过查询的方法名和参数名来自动构造一个JPA OQL查询，

如18行的方法不能通过编译，

控制台会提示找不到该属性名，

千万告诫自己编码一定要规范。