Spring Cloud Feign 错误

Question

org.springframework.beans.factory.UnsatisfiedDependencyException: Error creating bean with name 'feignController': Unsatisfied dependency expressed through field 'feignService'; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'org.study.base.microservices.service.BookFeignClient': FactoryBean threw exception on object creation; nested exception is java.lang.IllegalStateException: No Feign Client for loadBalancing defined. Did you forget to include spring-cloud-starter-ribbon?
    at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor$AutowiredFieldElement.inject(AutowiredAnnotationBeanPostProcessor.java:588) ~[spring-beans-4.3.12.RELEASE.jar:4.3.12.RELEASE]
    at org.springframework.beans.factory.annotation.InjectionMetadata.inject(InjectionMetadata.java:88) ~[spring-beans-4.3.12.RELEASE.jar:4.3.12.RELEASE]
    at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor.postProcessPropertyValues(AutowiredAnnotationBeanPostProcessor.java:366) ~[spring-beans-4.3.12.RELEASE.jar:4.3.12.RELEASE]
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.populateBean(AbstractAutowireCapableBeanFactory.java:1264) ~[spring-beans-4.3.12.RELEASE.jar:4.3.12.RELEASE]
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:553) ~[spring-beans-4.3.12.RELEASE.jar:4.3.12.RELEASE]
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:483) ~[spring-beans-4.3.12.RELEASE.jar:4.3.12.RELEASE]
    at org.springframework.beans.factory.support.AbstractBeanFactory$1.getObject(AbstractBeanFactory.java:306) ~[spring-beans-4.3.12.RELEASE.jar:4.3.12.RELEASE]
    at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:230) ~[spring-beans-4.3.12.RELEASE.jar:4.3.12.RELEASE]
    at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:302) ~[spring-beans-4.3.12.RELEASE.jar:4.3.12.RELEASE]
    at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:197) ~[spring-beans-4.3.12.RELEASE.jar:4.3.12.RELEASE]
    at org.springframework.beans.factory.support.DefaultListableBeanFactory.preInstantiateSingletons(DefaultListableBeanFactory.java:761) ~[spring-beans-4.3.12.RELEASE.jar:4.3.12.RELEASE]
    at org.springframework.context.support.AbstractApplicationContext.finishBeanFactoryInitialization(AbstractApplicationContext.java:867) ~[spring-context-4.3.12.RELEASE.jar:4.3.12.RELEASE]
    at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:543) ~[spring-context-4.3.12.RELEASE.jar:4.3.12.RELEASE]
    at org.springframework.boot.context.embedded.EmbeddedWebApplicationContext.refresh(EmbeddedWebApplicationContext.java:122) ~[spring-boot-1.5.8.RELEASE.jar:1.5.8.RELEASE]
    at org.springframework.boot.SpringApplication.refresh(SpringApplication.java:693) [spring-boot-1.5.8.RELEASE.jar:1.5.8.RELEASE]
    at org.springframework.boot.SpringApplication.refreshContext(SpringApplication.java:360) [spring-boot-1.5.8.RELEASE.jar:1.5.8.RELEASE]
    at org.springframework.boot.SpringApplication.run(SpringApplication.java:303) [spring-boot-1.5.8.RELEASE.jar:1.5.8.RELEASE]
    at org.springframework.boot.SpringApplication.run(SpringApplication.java:1118) [spring-boot-1.5.8.RELEASE.jar:1.5.8.RELEASE]
    at org.springframework.boot.SpringApplication.run(SpringApplication.java:1107) [spring-boot-1.5.8.RELEASE.jar:1.5.8.RELEASE]
    at org.study.base.microservices.FeignClient.main(FeignClient.java:19) [classes/:na]
Caused by: org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'org.study.base.microservices.service.BookFeignClient': FactoryBean threw exception on object creation; nested exception is java.lang.IllegalStateException: No Feign Client for loadBalancing defined. Did you forget to include spring-cloud-starter-ribbon?
    at org.springframework.beans.factory.support.FactoryBeanRegistrySupport.doGetObjectFromFactoryBean(FactoryBeanRegistrySupport.java:175) ~[spring-beans-4.3.12.RELEASE.jar:4.3.12.RELEASE]
    at org.springframework.beans.factory.support.FactoryBeanRegistrySupport.getObjectFromFactoryBean(FactoryBeanRegistrySupport.java:103) ~[spring-beans-4.3.12.RELEASE.jar:4.3.12.RELEASE]
    at org.springframework.beans.factory.support.AbstractBeanFactory.getObjectForBeanInstance(AbstractBeanFactory.java:1634) ~[spring-beans-4.3.12.RELEASE.jar:4.3.12.RELEASE]
    at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:254) ~[spring-beans-4.3.12.RELEASE.jar:4.3.12.RELEASE]
    at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:202) ~[spring-beans-4.3.12.RELEASE.jar:4.3.12.RELEASE]
    at org.springframework.beans.factory.config.DependencyDescriptor.resolveCandidate(DependencyDescriptor.java:208) ~[spring-beans-4.3.12.RELEASE.jar:4.3.12.RELEASE]
    at org.springframework.beans.factory.support.DefaultListableBeanFactory.addCandidateEntry(DefaultListableBeanFactory.java:1316) ~[spring-beans-4.3.12.RELEASE.jar:4.3.12.RELEASE]
    at org.springframework.beans.factory.support.DefaultListableBeanFactory.findAutowireCandidates(DefaultListableBeanFactory.java:1282) ~[spring-beans-4.3.12.RELEASE.jar:4.3.12.RELEASE]
    at org.springframework.beans.factory.support.DefaultListableBeanFactory.doResolveDependency(DefaultListableBeanFactory.java:1101) ~[spring-beans-4.3.12.RELEASE.jar:4.3.12.RELEASE]
    at org.springframework.beans.factory.support.DefaultListableBeanFactory.resolveDependency(DefaultListableBeanFactory.java:1066) ~[spring-beans-4.3.12.RELEASE.jar:4.3.12.RELEASE]
    at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor$AutowiredFieldElement.inject(AutowiredAnnotationBeanPostProcessor.java:585) ~[spring-beans-4.3.12.RELEASE.jar:4.3.12.RELEASE]
    ... 19 common frames omitted
Caused by: java.lang.IllegalStateException: No Feign Client for loadBalancing defined. Did you forget to include spring-cloud-starter-ribbon?
    at org.springframework.cloud.netflix.feign.FeignClientFactoryBean.loadBalance(FeignClientFactoryBean.java:148) ~[spring-cloud-netflix-core-1.3.5.RELEASE.jar:1.3.5.RELEASE]
    at org.springframework.cloud.netflix.feign.FeignClientFactoryBean.getObject(FeignClientFactoryBean.java:166) ~[spring-cloud-netflix-core-1.3.5.RELEASE.jar:1.3.5.RELEASE]
    at org.springframework.beans.factory.support.FactoryBeanRegistrySupport.doGetObjectFromFactoryBean(FactoryBeanRegistrySupport.java:168) ~[spring-beans-4.3.12.RELEASE.jar:4.3.12.RELEASE]
    ... 29 common frames omitted

BookFeignClient.java

@FeignClient(name="book-service")
public interface BookFeignClient {

    @RequestMapping("book/view/{id}")
    public Book viewBook(@RequestParam("id") String id);

}

FeignController.java

@RestController
public class FeignController {

    @Autowired
    private BookFeignClient feignService;

    @GetMapping("feign/view/{id}")
    public Book viewBook(@PathVariable String id) {

        return feignService.viewBook(id);
    }


}

FeignClient.java

@SpringBootApplication
@EnableFeignClients
@EnableDiscoveryClient
public class FeignClient {

    public static void main(String[] args) {
        SpringApplication.run(FeignClient.class, args);
    }
}

应用程序.yml

server:
  port: 8020
spring:
  application:
    name: micro-feign-client
eureka:
  client:
    serviceUrl:
      defaultZone: http://localhost:8761/eureka/
  instance:
    preferIpAddress: true
ribbon:
  eureka:
    enabled: true

pom.xml

<dependency>
    <groupId>org.springframework.cloud</groupId>
    <artifactId>spring-cloud-starter-eureka</artifactId>
</dependency>

<dependency>
    <groupId>org.springframework.cloud</groupId>
    <artifactId>spring-cloud-starter-feign</artifactId>
</dependency>

<dependency>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-actuator</artifactId>
</dependency>

达尔斯顿.SR4

我该如何解决这个问题？

Answer 1

我最近遇到了同样的错误， spring boot 2.0.3.RELEASE 。 当我第一次添加openfeign依赖时，没有版本，我发现Maven并没有拉下依赖（不知道为什么）。 所以我必须为 maven 明确定义版本才能实际拉取它。 有了这个，我还传递了spring-cloud-starter-Netflix-ribbon 。 此时，当我启动服务器时，我遇到了第一篇文章中指定的相同错误。 在 pom 中添加spring-cloud-starter-Netflix-ribbon依赖项后，错误得到解决。 所以我最终添加了这两个依赖项。

           <dependency>
                <groupId>org.springframework.cloud</groupId>
                <artifactId>spring-cloud-starter-openfeign</artifactId>
                <version>2.0.0.RELEASE</version>
           </dependency> 
           <dependency>
                <groupId>org.springframework.cloud</groupId>
                <artifactId>spring-cloud-starter-netflix-ribbon</artifactId>
                <version>2.0.0.RELEASE</version>
           </dependency>

Answer 2

在pom.xml添加功能区依赖项。

<dependency>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-cloud-starter-ribbon</artifactId>
</dependency>

我也在您的BookFeignClient看到了一些差异。 @PathVariable应该用来代替@RequestParam 。

@FeignClient(name="book-service")
public interface BookFeignClient {

    @RequestMapping("book/view/{id}")
    public Book viewBook(@PathVariable("id")  String id);

}

Answer 3

@SpringBootApplication
@EnableFeignClients
@EnableDiscoveryClient
public class FeignClient {

    public static void main(String[] args) {
        SpringApplication.run(FeignClient.class, args);
    }
}

改成

@SpringBootApplication
@EnableFeignClients
@EnableDiscoveryClient
public class FeignClientApplication {

    public static void main(String[] args) {
        SpringApplication.run(FeignClient.class, args);
    }
}

它现在工作

Answer 4

尝试在您的应用程序类中添加以下代码，即 FeignClient ：

@Bean
@LoadBalanced
RestTemplate restTemplate() {
    return new RestTemplate();
}

然后检查。

另外我认为你的

  @GetMapping("feign/view/{id}")
    public Book viewBook(@PathVariable String id) { // pertaining to feign Controller 

应该替换为：

 @RequestMapping("book/view/{id}")
 public Book viewBook(@RequestParam("id") String id);

Answer 5

将接口 BookFeignClient 更改为以下版本，此更改后 Spring 将不需要平衡。

@FeignClient(name="book-service", url = "https://meu.dominio.com")
public interface BookFeignClient {

    @RequestMapping("book/view/{id}")
    public Book viewBook(@PathVariable("id")  String id);
}

Answer 6

我认为您应该在代理中添加以下注释：

@FeignClient(name="book-service")
@RibbonClient(name="external-service-name") // this is missing, the name of the external service registered in your naming server
public interface BookFeignClient {
...

Answer 7

Adding below dependency should solve the issue:

<!-- https://mvnrepository.com/artifact/io.github.openfeign/feign-slf4j -->
<dependency>
    <groupId>io.github.openfeign</groupId>
    <artifactId>feign-slf4j</artifactId>
    <version>9.3.1</version>
</dependency>

Chose compatible version while adding. This dependency already present with-in the spring-cloud-openfeign-core but for some reason it does not get pulled.

Answer 8

添加以下 Maven 依赖项帮助我解决了这个问题-

<dependency>
    <groupId>io.github.openfeign.form</groupId>
       <artifactId>feign-form</artifactId>
    <version>3.4.1</version>
</dependency>

Answer 9

我正在做一个爱好项目，这是我的观察

我在 Feign 上关注了这个 url 问题，也来自Abduqoidir 的相关问答

我已经更改了我的 spring boot 项目版本

<parent>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-parent</artifactId>
    <version>2.2.4.RELEASE</version>
    <relativePath /> <!-- lookup parent from repository -->
</parent>

并将 spring 云版本更改为

        <spring-cloud.version>Hoxton.SR1</spring-cloud.version>