Ribbon with Spring Cloud and Eureka: java.lang.IllegalStateException: No instances available for Samarths-MacBook-Pro.local

Question

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

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

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}}

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

curl http://localhost:8090/

This is the error:

{"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:

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

Looks like my server list is empty.

Solution 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.

Solution 2

I got this working. The only change I had to make was in the way I was using RestTemplate api.

Error Code:

@Autowired
RestTemplate restTemplate;

@RequestMapping(value = "/",method = RequestMethod.GET)
String consumer(){
    String baseDir = restTemplate.getForObject("TEST", String.class);

    return baseDir;
}

Working Code:

@Autowired
RestTemplate restTemplate;

@RequestMapping(value = "/",method = RequestMethod.GET)
String consumer(){
    String baseDir = restTemplate.getForObject("http://TEST", String.class);

    return baseDir;
}

Solution:

The first parameter to restTemplate.getForObject should have the format of a URL. And the domain name should be the name of the service you want to discover.

Ex: http://TEST. Here, TEST is the name of my server registered to eureka registry

Solution 3

The question is already answered, but I found a workaround that seems neat and fixed our problem.

First declare a new @Component class and in it create a method that returns RestTemplate:

@Component
public class RestTemplateComponentFix{

 @Autowired
 SomeConfigurationYouNeed someConfiguration;

 @LoadBalanced
 public RestTemplate getRestTemplate() {
       // TODO set up your restTemplate
        rt.setRequestFactory( new HttpComponentsClientHttpRequestFactory() );
        return rt;
    }

}

After that just Autowire the restTemplateComponentFix in your class and when when you need the rest template call the restTemplate() method. Something like this:

@Service
public class someClass{

    @Autowired
    RestTemplateComponentFix restTemplateComponentFix;

    public void methodUsingRestTemplate(){
        // Some code...
        RestTemplate rt = restTemplateComponentFix.getRestTemplate();
        // Some code...
    }
}

After that you can unit test with something like:

RestTemplate rt = Mockito.mock(RestTemplate.class) 
when(restTemplateComponentFix.getRestTemplate()).thenReturn(rt);
when(rt.someMethod()).thenReturn(something);

Comments

[Samarth]

Thanks for the suggestion. I used a variation of your first choice to fix my problem.

[spencergibb]

Yup, that's what I said you needed to do.

[Rudy Vissers]

A link to the documentation:projects.spring.io/spring-cloud/…

[Jeff Cook]

Could you please guide here stackoverflow.com/questions/49791825/… ?

[Admin]

As it’s currently written, your answer is unclear. Please edit to add additional details that will help others understand how this addresses the question asked. You can find more information on how to write good answers in the help center.