带有Spring Cloud和Eureka的功能区:java.lang.IllegalStateException:Samarths-MacBook-Pro.local没有可用的实例

问题描述

我正在使用Ribbon负载平衡器来开发Spring Boot Eureka客户端应用程序.

I am working on Spring Boot Eureka Client Application with Ribbon Load Balancer.

我有两个在Eureka注册的服务器实例，名称为"TEST".在客户端，我有以下代码从Eureka获取服务器.

I have two instances of the server registered with Eureka with the name "TEST". On the client side, I have the following code to fetch the server from Eureka.

@Configuration
@ComponentScan
@EnableAutoConfiguration
@EnableEurekaClient
@RestController
public class EurekaConsumerApplication {

    @Autowired
    DiscoveryClient discoveryClient;

    @Autowired
    RestTemplate restTemplate;

    @RequestMapping(value = "/",method = RequestMethod.GET)
    String consumer(){
        InstanceInfo instance = discoveryClient.getNextServerFromEureka("TEST",        false);

        URI uri = UriComponentsBuilder.fromUriString(instance.getHomePageUrl() + "baseDir")
            .build()
            .toUri();
        String baseDir = restTemplate.getForObject(uri, String.class);

        return baseDir;

    }

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

application.yml

application.yml

spring:
  application:
    name: consumer
info:
  component: Consumer to fetch configuration
server:
  port: 8090
eureka:
  instance:
   leaseRenewalIntervalInSeconds: 3
  metadataMap:
    instanceId:   ${vcap.application.instance_id:${spring.application.name}:${spring.application.instance_id:${random.value}}}
client:
# Default values comes from   org.springframework.cloud.netflix.eurek.EurekaClientConfigBean
  region: default
  registryFetchIntervalSeconds: 5
  instanceInfoReplicationIntervalSeconds: 5
  initialInstanceInfoReplicationIntervalSeconds: 5
  serviceUrl:
    defaultZone: http://localhost:8761/eureka/
    availabilityZones:
    default: ${APPLICATION_DOMAIN:${DOMAIN:defaultZone}}

但是，当我通过使用以下命令命中宁静的端点时，会出现错误:

However, when I hit the restful endpoint by using the following command, it gives an error:

curl http://localhost:8090/

这是错误:

{"exception":"java.lang.IllegalStateException","message":"org.springframework.web.util.NestedServletException: Request processing failed; nested exception is java.lang.IllegalStateException: No instances available for Samarths-MacBook-Pro.local","path":"/"}

Stacktrace:

Stacktrace:

2015-07-22 14:37:35.005 INFO 13841 --- [tp1334391583-19] c.netflix.loadbalancer.BaseLoadBalancer : Client:Samarths-MacBook-Pro.local instantiated a LoadBalancer:DynamicServerListLoadBalancer:{NFLoadBalancer:name=Samarths-MacBook-Pro.local,current list of Servers=[],Load balancer stats=Zone stats: {},Server stats: []}ServerList:null
2015-07-22 14:37:35.009 INFO 13841 --- [tp1334391583-19] c.n.l.DynamicServerListLoadBalancer : DynamicServerListLoadBalancer for client Samarths-MacBook-Pro.local initialized: DynamicServerListLoadBalancer:{NFLoadBalancer:name=Samarths-MacBook-Pro.local,current list of Servers=[],Load balancer stats=Zone stats: {},Server stats: []}ServerList:org.springframework.cloud.netflix.ribbon.eureka.DomainExtractingServerList@681eda37
2015-07-22 14:37:35.029 WARN 13841 --- [tp1334391583-19] o.eclipse.jetty.servlet.ServletHandler :

org.springframework.web.util.NestedServletException: Request processing failed; nested exception is java.lang.IllegalStateException: No instances available for Samarths-MacBook-Pro.local
at org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:978)
at org.springframework.web.servlet.FrameworkServlet.doGet(FrameworkServlet.java:857)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:687)
at org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:842)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:790)
at org.eclipse.jetty.servlet.ServletHolder.handle(ServletHolder.java:808)
at org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1669)
at org.springframework.boot.actuate.autoconfigure.EndpointWebMvcAutoConfiguration$ApplicationContextHeaderFilter.doFilterInternal(EndpointWebMvcAutoConfiguration.java:295)
at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107)
at org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1652)
at org.springframework.boot.actuate.trace.WebRequestTraceFilter.doFilterInternal(WebRequestTraceFilter.java:102)
at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107)
at org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1652)
at org.springframework.web.filter.HiddenHttpMethodFilter.doFilterInternal(HiddenHttpMethodFilter.java:77)
at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107)
at org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1652)
at org.springframework.web.filter.CharacterEncodingFilter.doFilterInternal(CharacterEncodingFilter.java:85)
at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107)
at org.eclipse.jetty..ServletHandler$CachedChain.doFilter(ServletHandler.java:1652)
at org.springframework.boot.actuate.autoconfigure.MetricsFilter.doFilterInternal(MetricsFilter.java:68)
at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107)
at org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1652)
at org.eclipse.jetty.servlet.ServletHandler.doHandle(ServletHandler.java:585)
at org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java:143)
at org.eclipse.jetty.security.SecurityHandler.handle(SecurityHandler.java:548)
at org.eclipse.jetty.server.session.SessionHandler.doHandle(SessionHandler.java:223)
at org.eclipse.jetty.server.handler.ContextHandler.doHandle(ContextHandler.java:1127)
at org.eclipse.jetty.servlet.ServletHandler.doScope(ServletHandler.java:515)
at org.eclipse.jetty.server.session.SessionHandler.doScope(SessionHandler.java:185)
at org.eclipse.jetty.server.handler.ContextHandler.doScope(ContextHandler.java:1061)
at org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java:141)
at org.eclipse.jetty.server.handler.HandlerWrapper.handle(HandlerWrapper.java:97)
at org.eclipse.jetty.server.Server.handle(Server.java:499)
at org.eclipse.jetty.server.HttpChannel.handle(HttpChannel.java:310)
at org.eclipse.jetty.server.HttpConnection.onFillable(HttpConnection.java:257)
at org.eclipse.jetty.io.AbstractConnection$2.run(AbstractConnection.java:540)
at org.eclipse.jetty.util.thread.QueuedThreadPool.runJob(QueuedThreadPool.java:635)
at org.eclipse.jetty.util.thread.QueuedThreadPool$3.run(QueuedThreadPool.java:555)
at java.lang.Thread.run(Thread.java:745)
Caused by: java.lang.IllegalStateException: No instances available for Samarths-MacBook-Pro.local
at org.springframework.cloud.netflix.ribbon.RibbonClientHttpRequestFactory.createRequest(RibbonClientHttpRequestFactory.java:64)
at org.springframework.http.client.support.HttpAccessor.createRequest(HttpAccessor.java:76)
at org.springframework.web.client.Rlate.doExecute(RestTemplate.java:565)
at org.springframework.web.client.RestTemplate.execute(RestTemplate.java:545)
at org.springframework.web.client.RestTemplate.getForObject(RestTemplate.java:253)
at com.securityscorecard.eureka.consumer.EurekaConsumerApplication.consumer(EurekaConsumerApplication.java:53)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:497)
at org.springframework.web.method.support.InvocableHandlerMethod.doInvoke(InvocableHandlerMethod.java:221)
at org.springframework.web.method.support.InvocableHandlerMethod.invokeForRequest(InvocableHandlerMethod.java:137)
at org.springframework.web.servlet.mvc.method.annotation.ServletInvocableHandlerMethod.invokeAndHandle(ServletInvocableHandlerMethod.java:110)
at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.invokeHandleMethod(RequestMappingHandlerAdapter.java:776)
at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.handleInternal(RequestMappingHandlerAdapter.java:705)
at org.springframework.web.servlet.mvc.method.AbstractHandlerMethodAdapter.handle(AbstractHandlerMethodAdapter.java:85)
at org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:959)
at org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:893)
at org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:966)
... 38 common frames omitted

好像我的服务器列表是空的.

Looks like my server list is empty.

推荐答案

您自动接线的RestTemplate已连接到Ribbon.因此，您手动进行查找，然后RestTemplate尝试查找传递到功能区的主机名.您有两个选择:1)不要使用netflix DiscoveryClient并将serviceId作为逻辑主机名传递到功能区(http://TEST/myservice)，2)不要使用自动连接的RestTemplate，为您的计算机创建一个新的班级.我的选择是#1.

The RestTemplate you autowired is already connected to Ribbon. So you do a lookup by hand and then RestTemplate is trying to lookup the hostname passed in to ribbon. You have two options: 1) Don't use the netflix DiscoveryClient and pass the serviceId as a logical hostname to ribbon (http://TEST/myservice), 2) Don't use the autowired RestTemplate, create a new one for your class. My choice would be #1.

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