在做服務(wù)降級的時候，老是報錯
先看一下具體錯誤：

FactoryBean threw exception on object creation; nested exception is java.lang.IllegalStateException: No fallbackFactory instance of type class com.springCloudApi.service.testFallBackService found for feign client springCloudProvider

我是在api模塊做的服務(wù)降級
springCloudApi

IServiceProvider

import org.springframework.cloud.openfeign.FeignClient;
import org.springframework.stereotype.Service;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RequestParam;

import java.util.List;

@Service
@FeignClient(name = "springCloudProvider", fallbackFactory = testFallBackService.class)
public interface IServiceProvider {

    @GetMapping("/listTest")
    List<testPO> listTest(@RequestParam("name") String name);

}

testFallBackService

import feign.hystrix.FallbackFactory;
import org.springframework.stereotype.Component;

import java.util.ArrayList;
import java.util.List;

@Component
public class testFallBackService implements FallbackFactory<IServiceProvider> {

    @Override
    public IServiceProvider create(Throwable throwable) {
        return new IServiceProvider() {
            @Override
            public List<testPO> listTest(String name) {
                List<testPO> testPOS = new ArrayList<>();
                testPO testPO = new testPO();
                testPO.setName("該服務(wù)已被降級");
                testPOS.add(testPO);
                return testPOS;
            }
        };
    }
}

以上是服務(wù)降級的全部代碼，然后我搜上面的報錯，大部分都是在說我FallbackFactory類，沒有加@Component這個注解，但我加了還是報這個錯

 Error creating bean with name 'consumerController': Unsatisfied dependency expressed through field 'iServiceProvider'; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'com.springCloudApi.service.IServiceProvider': FactoryBean threw exception on object creation; nested exception is java.lang.IllegalStateException: No fallbackFactory instance of type class com.springCloudApi.service.testFallBackService found for feign client springCloudProvider

我仔細看了這個錯誤，發(fā)現(xiàn)是我這個FallbackFactory類，沒有注入到spring中所以它連帶著IServiceProvider沒有創(chuàng)建bean成功。
我沿著這個方向去搜索錯誤，被我找到了一個博主和我一樣的問題。
感謝這位博主寫的博客
https://blog.csdn.net/sdp1103285470/article/details/89084880
最終在你的springCloudConsumer模塊的啟動類中的@SpringBootApplication注解里面加上scanBasePackages問題就解決了，原因就是沒有掃描到那個類嘛，那我們給他加上就好了,@EnableFeignClients中的basePackages只能掃描到Feign的注解。
以下是代碼：

@EnableEurekaClient
@EnableFeignClients(basePackages = "com.springCloudApi")
@SpringBootApplication(exclude= {DataSourceAutoConfiguration.class}, scanBasePackages = {"com.springCloudApi.service", "com.springCloudConsumerFeiger"})
public class consumerFeignApplication {
    public static void main(String[] args) {
        SpringApplication.run(consumerFeignApplication.class, args);
    }
}

注意：com.springCloudApi.service是包含F(xiàn)allbackFactory類的包(backage)。com.springCloudConsumerFeiger是你原本這個類的包掃描路徑。如果你只加上com.springCloudApi.service那么你這個原本的掃描路徑就會被覆蓋掉。文章來源地址http://www.zghlxwxcb.cn/news/detail-633150.html

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