1、版本说明
Spring Cloud Alibaba 2021.0.1.0
spring-boot-dependencies 2.6.3
spring-cloud-starter-openfeign 3.1.2
spring-cloud-loadbalancer 3.1.2
spring-cloud-starter-netflix-hystrix 2.2.6.RELEASE
2、所需依赖
<!-- springboot的依赖-->
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-dependencies</artifactId>
<version>2.6.3</version>
<type>pom</type>
<scope>import</scope>
</dependency>
<!--SpringBoot整合Spring Cloud Alibaba-->
<dependency>
<groupId>com.alibaba.cloud</groupId>
<artifactId>spring-cloud-alibaba-dependencies</artifactId>
<version>2021.0.1.0</version>
<type>pom</type>
<scope>import</scope>
</dependency>
<!-- ==========使用feign+熔断功能所需依赖========= -->
<!-- openfeign依赖 -->
<dependency>
<groupId>org.springframework.cloud</groupId>
<artifactId>spring-cloud-starter-openfeign</artifactId>
<version>3.1.2</version>
</dependency>
<!--loadbalancer依赖-->
<dependency>
<groupId>org.springframework.cloud</groupId>
<artifactId>spring-cloud-loadbalancer</artifactId>
<version>3.1.2</version>
</dependency>
<!--Spring Cloud2020之后，需要引入 spring-cloud-starter-netflix-hystrix 依赖-->
<dependency>
<groupId>org.springframework.cloud</groupId>
<artifactId>spring-cloud-starter-netflix-hystrix</artifactId>
<version>2.2.6.RELEASE</version>
</dependency>
<!-- ==========使用feign+熔断功能所需依赖========= -->
3、常见报错问题
3.1、Relying upon circular references is discouraged and they are prohibited by default. Update your application to remove the dependency cycle between beans. As a last resort, it may be possible to break the cycle automatically by setting spring.main.allow-circular-references to true
解决方法: 在配置文件中添加以下内容
spring:
main:
allow-circular-references: true # 解决spring boot 2.6后，因循环引用导致启动时报错的问题
3.2、Caused by: java.lang.IllegalStateException: No Feign Client for loadBalancing defined. Did you forget to include spring-cloud-starter-loadbalancer?
解决方法：添加依赖
<!--loadbalancer依赖-->
<dependency>
<groupId>org.springframework.cloud</groupId>
<artifactId>spring-cloud-loadbalancer</artifactId>
<version>3.1.2</version>
</dependency>
3.3、调用时报错：feign.FeignException$ServiceUnavailable: [503] during [POST] to [http://zhanzhan-generator/zhanzhan/generator/generatorCode] [GeneratorFeignClient#generatorCode(GenInfo)]: [Load balancer does not contain an instance for the service zhanzhan-generator]
解决方法：添加依赖or添加配置
<!--Spring Cloud2020之后，需要引入 spring-cloud-starter-netflix-hystrix 依赖-->
<dependency>
<groupId>org.springframework.cloud</groupId>
<artifactId>spring-cloud-starter-netflix-hystrix</artifactId>
<version>2.2.6.RELEASE</version>
</dependency>
# feign 配置
feign:
circuitbreaker:
enabled: true
