SpringBoot自定义全局异常处理器的问题总结

@RestControllerAdvice
@Slf4j
public class GlobalExceptionHandler {
    @ExceptionHandler(Exception.class)
    @ResponseStatus(HttpStatus.INTERNAL_SERVER_ERROR)
    public RestErrorResponse exception(Exception e){
        //record log
        log.error("系统异常{}", e.getMessage(),e);
        //decode errorException
        String errMessage = "系统异常";
        return new RestErrorResponse(errMessage);
    }
}

@Data
@AllArgsConstructor
public class RestErrorResponse implements Serializable {
    private String errMessage;
}

@Data
public class XueChengPlusException extends RuntimeException {
    private String errMessage;
    public XueChengPlusException() {
        super();
    }
    public XueChengPlusException(String errMessage) {
        super(errMessage);
        this.errMessage = errMessage;
    }
    public static void cast(CommonError commonError){
        throw new XueChengPlusException(commonError.getErrMessage());
    }
    public static void cast(String errMessage){
        throw new XueChengPlusException(errMessage);
    }
}

@Getter
public enum CommonError {
    UNKOWN_ERROR("执行过程异常，请重试。"),
    PARAMS_ERROR("非法参数"),
    OBJECT_NULL("对象为空"),
    QUERY_NULL("查询结果为空"),
    REQUEST_NULL("请求参数为空");
    private String errMessage;
    private CommonError( String errMessage) {
        this.errMessage = errMessage;
    }
}

@RestControllerAdvice
@Slf4j
public class GlobalExceptionHandler {
    @ExceptionHandler(XueChengPlusException.class)
    @ResponseStatus(HttpStatus.INTERNAL_SERVER_ERROR)
    public RestErrorResponse customException(XueChengPlusException e){
        //record log
        log.error("系统异常{}", e.getErrMessage(),e);
        //decode errorException
        String errMessage = e.getErrMessage();
        return new RestErrorResponse(errMessage);
    }
    @ExceptionHandler(Exception.class)
    @ResponseStatus(HttpStatus.INTERNAL_SERVER_ERROR)
    public RestErrorResponse exception(Exception e){
        //record log
        log.error("系统异常{}", e.getMessage(),e);
        //decode errorException
        String errMessage = CommonError.UNKOWN_ERROR.getErrMessage();
        return new RestErrorResponse(errMessage);
    }
}

throw new RuntimeException("价格不能为空且必须大于0");

@ExceptionHandler(Exception.class)
    public RestErrorResponse exception(Exception e)

XueChengPlusException.cast(CommonError.PARAMS_ERROR);

XueChengPlusException.cast("其他的消息");

throw new XueChengPlusException(CommonError.OBJECT_NULL.getErrMessage());

throw new XueChengPlusException("其他的消息");

@ExceptionHandler(XueChengPlusException.class)
    public RestErrorResponse customException(XueChengPlusException e)