spring 启动时在我的控制器中自动装配一个 Feign 客户端抛出异常

Question

我已经在 and this 上尝试过解决方案，但没有成功，所以我可能遗漏了其他东西

这是我的架构

我有一个受 Oauth2 保护的资源微服务，它正在实现我的业务逻辑，还有一个使用 thymleaf 模板的客户端微服务正在使用该资源。使用 Oauth2RestTemplate 很好，现在我正在尝试使用 feign。

首先是我的资源项目简历

Application.yml

spring.application.name: COMPONENTS

server:
  port: 0


  
eureka.client.service-url.defaultZone: xxxxxxxxxxxxxxxxxxxxxxxx

security.oauth2.resource.token-info-uri: xxxxxxxxxxxxxxxxxxxxxx
security.oauth2.client.client-id: xxxxxxxxxxxxxx
security.oauth2.client.client-secret: xxxxxxxxxxxxx

spring.jackson.date-format: com.fasterxml.jackson.databind.util.ISO8601DateFormat


spring:
  datasource:
    url: jdbc:mariadb://localhost:3306/pos_auth?createDatabaseIfNotExist=true
    username: root
    password: xxxxxxxx
    driver-class-name: org.mariadb.jdbc.Driver

还有一个简单的控制器

@Controller
@RequestMapping(ApplicationController.API)
public class ApplicationController {
    
    public static final String API = "applications";
    
    @Autowired
    private ComponentsService componentsService;
    
    @GetMapping
    public ResponseEntity<List<Apps>> getApplicationsList() {
        return new ResponseEntity<List<Apps>>(componentsService.getAllApps(), HttpStatus.OK);
    }

    
}

下面是我的客户端Feign客户端实现的重要部分

主要class

@SpringBootApplication
@EnableOAuth2Sso
@EnableEurekaClient
@EnableDiscoveryClient
@EnableWebSecurity
public class ClientApplication extends WebSecurityConfigurerAdapter{


    public static void main(String[] args) {
        SpringApplication.run(ClientApplication.class, args);
    }
    
    
        @Override
        protected void configure(HttpSecurity http) throws Exception {
            http
                    .logout()
                    .logoutSuccessUrl("http://localhost:9999/uaa/exit");
            http.authorizeRequests().antMatchers("/graphics/**").permitAll().
                    and().authorizeRequests().anyRequest().authenticated();
        }
   

    @Bean
    @LoadBalanced
    OAuth2RestTemplate oauth2RestTemplate(OAuth2ClientContext oauth2ClientContext, OAuth2ProtectedResourceDetails details) {
        return new OAuth2RestTemplate(details, oauth2ClientContext);
    }

    @Profile("!cloud")
    @Bean
    RequestDumperFilter requestDumperFilter() {
        return new RequestDumperFilter();
    }

}

假配置

@Configuration
@EnableFeignClients
@ImportAutoConfiguration({RibbonAutoConfiguration.class, FeignRibbonClientAutoConfiguration.class, FeignAutoConfiguration.class})
public class FeignConfig {

}

调用索引时客户端控制器中我希望的行为

@Controller
public class MessageController {

    @Autowired
    OAuth2RestTemplate restTemplate;

    
    @Autowired
    private AppClientFeign appClientFeign;


    @RequestMapping("/")
    String home(Model model) {
        model.addAttribute("applications", appClientFeign.getApps());
        System.out.println(appClientFeign.getApps());
        return "index";
    }

  
}

我的假客户终于来了

@FeignClient("COMPONENTS")
public interface AppClientFeign {
    @RequestMapping(method = RequestMethod.GET, value = "/applications")
    List<App> getApps();
}

而运行客户端我收到以下异常

Field appClientFeign in demo.MessageController required a bean of type 'org.springframework.cloud.netflix.feign.FeignContext' that could not be found.

Bean method 'feignContext' not loaded because @ConditionalOnClass did not find required class 'feign.Feign'

Answer 1

解释： 知道 spring 云在默认情况下有 Feign 不添加 feign starter 依赖项不会触发任何编译时间问题（因为使用 javax jpa 应该由入门项目 Data JPA 注入）在我的情况下我忘记添加 starter到项目 pom，spring 搜索他找不到的实现或配置。

解决方法 添加启动器伪装依赖项

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

Answer 2

对于Spring以上的启动版本2.0.0.M4使用

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

spring 启动时在我的控制器中自动装配一个 Feign 客户端抛出异常

Autowiring a Feign client in my controller when spring launching throws exception

java

spring

spring-boot

spring-cloud-feign