在使用主键进行更新或者删除的时候，报下面错误
There is no getter for property named ‘null’ in 'class 。。。
代码如下

@Builder
@Data
public class Course implements Serializable {
    private static final long serialVersionUID = -16929324809307129L;
    
    private Long cid;

    private String cname;

    private Integer cstatus;

    private Integer userid;

}

解决办法如下

@TableId
private Long cid;