背景:内部要进行应用jdk&springboot升级,因此也需要将Spring Cloud Hystrix 替换成alibaba sentinel。
依赖
<dependency>
<groupId>com.alibaba.cloud</groupId>
<artifactId>spring-cloud-starter-alibaba-sentinel</artifactId>
<version>2022.0.0.0-RC2</version>
</dependency>
<dependency>
<groupId>com.alibaba.csp</groupId>
<artifactId>sentinel-datasource-nacos</artifactId>
<version>1.8.6</version>
</dependency>
开启Feign对Sentinel的支持
sentinel官方文档
出现错误日志时的代码
import org.springframework.cloud.openfeign.FeignClient;
import org.springframework.web.bind.annotation.PostMapping;
import org.springframework.web.bind.annotation.RequestParam;
/**
* @Author: WeiXiang
* @Desc:
* @Date: Create in 5:09 PM on 2020/6/23.
*/
@FeignClient(value = "messageCenter", path = "/messageCenter/cloudService")
public interface JobApplyRest {
/**
* 获取用户最近的报名兼职list
*
* @desc:
* @author: WeiXiang
* @date: 9:04 PM 2020/6/23
*/
@PostMapping("/userLastMonthApplyPartJob")
String userLastMonthApplyPartJob(@RequestParam("userId") Long userId, @RequestParam("size") Integer size);
}
当达到熔断条件时,则抛出以下错误信息
错误被解决后的代码
解决方案:在FeignClient上,配置自定义fallback熔断降级处理方法
import org.springframework.cloud.openfeign.FeignClient;
import org.springframework.web.bind.annotation.PostMapping;
import org.springframework.web.bind.annotation.RequestParam;
/**
* @Author: WeiXiang
* @Desc:
* @Date: Create in 5:09 PM on 2020/6/23.
*/
@FeignClient(value = "messageCenter", path = "/messageCenter/cloudService", fallback = JobApplyRestFallback.class)
public interface JobApplyRest {
/**
* 获取用户最近的报名兼职list
*
* @desc:
* @author: WeiXiang
* @date: 9:04 PM 2020/6/23
*/
@PostMapping("/userLastMonthApplyPartJob")
String userLastMonthApplyPartJob(@RequestParam("userId") Long userId, @RequestParam("size") Integer size);
}
JobApplyRestFallback类
import lombok.extern.slf4j.Slf4j;
import org.springframework.stereotype.Service;
/**
* @description: 报名单服务容错类
* @author: jiusi
* @create: 2023-09-01 10:23:47
*/
@Service
@Slf4j
public class JobApplyRestFallback implements JobApplyRest{
@Override
public String userLastMonthApplyPartJob(Long userId, Integer size) {
log.warn("熔断降级开启JobApplyRest#userLastMonthApplyPartJob:userId:{}", userId);
return null;
}
}
至此,java.lang.reflect.UndeclaredThrowableException 错误被解决。
问题原因:文章来源:https://www.toymoban.com/news/detail-689862.html
sentinel通过代理实现熔断降级,当达到设置的阈值条件时,内部就抛出的自定义受检异常。但该受检异常并未在被代理对象接口定义中进行声明(即:Rest feignClient为被代理对象),那么这个异常就会被JVM包装成UndeclaredThrowableException进行抛出。文章来源地址https://www.toymoban.com/news/detail-689862.html
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