带有 Spring Cloud 和 Eureka java.lang.IllegalStateException 的 Ribbon:没有可用于本地主机的实例 [英] Ribbon with Spring Cloud and Eureka java.lang.IllegalStateException: No instances available for localhost

问题描述

我正在使用

<dependency>
  <groupId>org.springframework.cloud</groupId>
  <artifactId>spring-cloud-netflix</artifactId>
  <version>1.2.3.RELEASE</version>
  <type>pom</type>
  <scope>import</scope>
</dependency>

我的主要课程:

@SpringBootApplication
//@Configuration
@ComponentScan(basePackages = "com.mypackage")
@EnableAutoConfiguration
@EnableEurekaClient
@EnableSwagger2
public class App 
{
  public static void main( String[] args )
  {

    SpringApplication.run(App.class, args);
  }

  @LoadBalanced
  @Bean(name="template")
  RestTemplate restTemplate() {
    return new RestTemplate();
  }
}

我的服务电话:

@Autowired
private RestTemplate template;

ResponseEntity<String> avs = template.exchange("http://localhost:7075/xyz/json/authenticate",HttpMethod.POST ,request,String.class); 

抛出以下异常

java.lang.IllegalStateException: No instances available for localhost
    at org.springframework.cloud.netflix.ribbon.RibbonLoadBalancerClient.execute(RibbonLoadBalancerClient.java:90)
    at org.springframework.cloud.client.loadbalancer.RetryLoadBalancerInterceptor$1.doWithRetry(RetryLoadBalancerInterceptor.java:60)
    at org.springframework.cloud.client.loadbalancer.RetryLoadBalancerInterceptor$1.doWithRetry(RetryLoadBalancerInterceptor.java:48)
    at org.springframework.retry.support.RetryTemplate.doExecute(RetryTemplate.java:276)
    at org.springframework.retry.support.RetryTemplate.execute(RetryTemplate.java:157)

推荐答案

当您使用 @LoadBalanced RestTemplate 时，主机名需要是 serviceId 而不是实际的主机名.在您的情况下，它正在尝试为 localhost 查找尤里卡记录，但找不到.有关如何使用多个 RestTemplate，请参阅文档 对象，一个负载均衡，一个没有.

When you use a @LoadBalanced RestTemplate the hostname needs to be a serviceId not an actual hostname. In your case, it's trying to find a eureka record for localhost and can't find one. See the documentation for how to use multiple RestTemplate objects, one load balanced, one not.

@Configuration
public class MyConfiguration {

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

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

public class MyClass {
    @Autowired
    private RestTemplate restTemplate;

    @Autowired
    @LoadBalanced
    private RestTemplate loadBalanced;

    public String doOtherStuff() {
        return loadBalanced.getForObject("http://stores/stores", String.class);
    }

    public String doStuff() {
        return restTemplate.getForObject("http://example.com", String.class);
    }
}

这篇关于带有 Spring Cloud 和 Eureka java.lang.IllegalStateException 的 Ribbon:没有可用于本地主机的实例的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！