springboot2.x引入feign踩的坑及解决

<!-- feign依赖 -->
<dependency>
  <groupId>org.springframework.cloud</groupId>
  <artifactId>spring-cloud-starter-feign</artifactId>
  <version>1.2.2.RELEASE</version>
</dependency>
<!-- hystrix 断路器依赖 用于处理请求第三方接口超时 -->
<dependency>
  <groupId>org.springframework.cloud</groupId>
  <artifactId>spring-cloud-starter-hystrix</artifactId>
  <version>1.2.3.RELEASE</version>
</dependency>
<dependency>
  <groupId>org.springframework.cloud</groupId>
  <artifactId>spring-cloud-starter-hystrix-dashboard</artifactId>
  <version>1.2.3.RELEASE</version>
</dependency>

@EnableCaching
@EnableAutoConfiguration
@SpringBootApplication
@EnableConfigurationProperties
@ServletComponentScan//配置druid必须加的注解，如果不加，访问页面打不开，filter和servlet、listener之类的需要单独进行注册才能使用，spring boot里面提供了该注解起到注册作用
@EnableTransactionManagement
@EnableFeignClients
@EnableHystrix
@EnableCircuitBreaker
@EnableHystrixDashboard
public class App {
	public static void main(String[] args) {
		SpringApplication.run(App.class, args);
	}
}

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

<!-- 此处一定要注释掉parent继承父级的依赖 -->
<!--<parent>-->
    <!--<groupId>org.springframework.boot</groupId>-->
    <!--<artifactId>spring-boot-starter-parent</artifactId>-->
    <!--<version>2.1.2.RELEASE</version>-->
<!--</parent>-->
<dependencies>
  <!-- ...其他的依赖省略了 -->
  <dependency>
      <groupId>org.springframework.cloud</groupId>
      <artifactId>spring-cloud-starter-openfeign</artifactId>
  </dependency>
  <dependency>
      <groupId>org.springframework.cloud</groupId>
      <artifactId>spring-cloud-starter-hystrix</artifactId>
      <version>1.2.3.RELEASE</version>
  </dependency>
  <dependency>
      <groupId>org.springframework.cloud</groupId>
      <artifactId>spring-cloud-starter-hystrix-dashboard</artifactId>
      <version>1.2.3.RELEASE</version>
  </dependency>
</dependencies>
 
<repositories>
  <repository>
      <id>spring-milestones</id>
      <name>Spring Milestones</name>
      <url>https://repo.spring.io/libs-milestone</url>
      <snapshots>
          <enabled>false</enabled>
      </snapshots>
  </repository>
</repositories>
<dependencyManagement>
  <dependencies>
      <dependency>
          <groupId>org.springframework.cloud</groupId>
          <artifactId>spring-cloud-openfeign</artifactId>
          <version>2.0.0.RC1</version>
          <type>pom</type>
          <scope>import</scope>
      </dependency>
  </dependencies>
</dependencyManagement>