Feign报错Load balancer does not have available server for client: 怎么解决?

eureka和springboot都能够正常启动，

当Feign调用服务提供者就会报以下的错误

2021-08-02 15:21:01.317  INFO 31424 --- [nio-9020-exec-1] c.netflix.loadbalancer.BaseLoadBalancer  : Client: common-item instantiated a LoadBalancer: DynamicServerListLoadBalancer:{NFLoadBalancer:name=common-item,current list of Servers=[],Load balancer stats=Zone stats: {},Server stats: []}ServerList:null
2021-08-02 15:21:01.322  INFO 31424 --- [nio-9020-exec-1] c.n.l.DynamicServerListLoadBalancer      : Using serverListUpdater PollingServerListUpdater
2021-08-02 15:21:01.324  INFO 31424 --- [nio-9020-exec-1] c.n.l.DynamicServerListLoadBalancer      : DynamicServerListLoadBalancer for client common-item initialized: DynamicServerListLoadBalancer:{NFLoadBalancer:name=common-item,current list of Servers=[],Load balancer stats=Zone stats: {},Server stats: []}ServerList:com.netflix.loadbalancer.ConfigurationBasedServerList@72faaa92
java.lang.RuntimeException: com.netflix.client.ClientException: Load balancer does not have available server for client: common-item
    at org.springframework.cloud.openfeign.ribbon.LoadBalancerFeignClient.execute(LoadBalancerFeignClient.java:91)
    at feign.SynchronousMethodHandler.executeAndDecode(SynchronousMethodHandler.java:119)
    at feign.SynchronousMethodHandler.invoke(SynchronousMethodHandler.java:89)
    at feign.ReflectiveFeign$FeignInvocationHandler.invoke(ReflectiveFeign.java:100)
    at com.sun.proxy.$Proxy76.selectTbItemAllByPage(Unknown Source)
    at com.bzsc.backend.item.service.impl.ItemServiceImpl.selectTbItemAllByPage(ItemServiceImpl.java:16)
    at com.bzsc.backend.item.controller.ItemController.selecetTbItemAllByPage(ItemController.java:16)
    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:498)
    at org.springframework.web.method.support.InvocableHandlerMethod.doInvoke(InvocableHandlerMethod.java:190)
    at org.springframework.web.method.support.InvocableHandlerMethod.invokeForRequest(InvocableHandlerMethod.java:138)
    at org.springframework.web.servlet.mvc.method.annotation.ServletInvocableHandlerMethod.invokeAndHandle(ServletInvocableHandlerMethod.java:105)
    at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.invokeHandlerMethod(RequestMappingHandlerAdapter.java:878)
    at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.handleInternal(RequestMappingHandlerAdapter.java:792)
    at org.springframework.web.servlet.mvc.method.AbstractHandlerMethodAdapter.handle(AbstractHandlerMethodAdapter.java:87)
    at org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:1040)
    at org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:943)
    at org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:1006)
    at org.springframework.web.servlet.FrameworkServlet.doGet(FrameworkServlet.java:898)
    at javax.servlet.http.HttpServlet.service(HttpServlet.java:626)
    at org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:883)
    at javax.servlet.http.HttpServlet.service(HttpServlet.java:733)
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:231)
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
    at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:53)
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
    at org.springframework.web.filter.RequestContextFilter.doFilterInternal(RequestContextFilter.java:100)
    at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:119)
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
    at org.springframework.web.filter.FormContentFilter.doFilterInternal(FormContentFilter.java:93)
    at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:119)
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
    at org.springframework.web.filter.CharacterEncodingFilter.doFilterInternal(CharacterEncodingFilter.java:201)
    at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:119)
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
    at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:202)
    at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:96)
    at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:541)
    at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:139)
    at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:92)
    at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:74)
    at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:343)
    at org.apache.coyote.http11.Http11Processor.service(Http11Processor.java:373)
    at org.apache.coyote.AbstractProcessorLight.process(AbstractProcessorLight.java:65)
    at org.apache.coyote.AbstractProtocol$ConnectionHandler.process(AbstractProtocol.java:868)
    at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1589)
    at org.apache.tomcat.util.net.SocketProcessorBase.run(SocketProcessorBase.java:49)
    at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
    at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)
    at java.lang.Thread.run(Thread.java:748)
Caused by: com.netflix.client.ClientException: Load balancer does not have available server for client: common-item
    at com.netflix.loadbalancer.LoadBalancerContext.getServerFromLoadBalancer(LoadBalancerContext.java:483)
    at com.netflix.loadbalancer.reactive.LoadBalancerCommand$1.call(LoadBalancerCommand.java:184)
    at com.netflix.loadbalancer.reactive.LoadBalancerCommand$1.call(LoadBalancerCommand.java:180)
    at rx.Observable.unsafeSubscribe(Observable.java:10327)
    at rx.internal.operators.OnSubscribeConcatMap.call(OnSubscribeConcatMap.java:94)
    at rx.internal.operators.OnSubscribeConcatMap.call(OnSubscribeConcatMap.java:42)
    at rx.Observable.unsafeSubscribe(Observable.java:10327)
    at rx.internal.operators.OperatorRetryWithPredicate$SourceSubscriber$1.call(OperatorRetryWithPredicate.java:127)
    at rx.internal.schedulers.TrampolineScheduler$InnerCurrentThreadScheduler.enqueue(TrampolineScheduler.java:73)
    at rx.internal.schedulers.TrampolineScheduler$InnerCurrentThreadScheduler.schedule(TrampolineScheduler.java:52)
    at rx.internal.operators.OperatorRetryWithPredicate$SourceSubscriber.onNext(OperatorRetryWithPredicate.java:79)
    at rx.internal.operators.OperatorRetryWithPredicate$SourceSubscriber.onNext(OperatorRetryWithPredicate.java:45)
    at rx.internal.util.ScalarSynchronousObservable$WeakSingleProducer.request(ScalarSynchronousObservable.java:276)
    at rx.Subscriber.setProducer(Subscriber.java:209)
    at rx.internal.util.ScalarSynchronousObservable$JustOnSubscribe.call(ScalarSynchronousObservable.java:138)
    at rx.internal.util.ScalarSynchronousObservable$JustOnSubscribe.call(ScalarSynchronousObservable.java:129)
    at rx.internal.operators.OnSubscribeLift.call(OnSubscribeLift.java:48)
    at rx.internal.operators.OnSubscribeLift.call(OnSubscribeLift.java:30)
    at rx.internal.operators.OnSubscribeLift.call(OnSubscribeLift.java:48)
    at rx.internal.operators.OnSubscribeLift.call(OnSubscribeLift.java:30)
    at rx.internal.operators.OnSubscribeLift.call(OnSubscribeLift.java:48)
    at rx.internal.operators.OnSubscribeLift.call(OnSubscribeLift.java:30)
    at rx.Observable.subscribe(Observable.java:10423)
    at rx.Observable.subscribe(Observable.java:10390)
    at rx.observables.BlockingObservable.blockForSingle(BlockingObservable.java:443)
    at rx.observables.BlockingObservable.single(BlockingObservable.java:340)
    at com.netflix.client.AbstractLoadBalancerAwareClient.executeWithLoadBalancer(AbstractLoadBalancerAwareClient.java:112)
    at org.springframework.cloud.openfeign.ribbon.LoadBalancerFeignClient.execute(LoadBalancerFeignClient.java:84)
    ... 56 more

网络上的基本所有方法基本我都尝试过全部都无法解决。
提供服务的是common_item

这里开始是服务提供者common_item的配置和类
application.yml

spring:
  application:
    name: common-item
  datasource:
    url: jdbc:mysql://101.34.255.200:3306/db_bzshop?characterEncoding=UTF-8
    password: kovitno1
    username: root
    driver-class-name: com.mysql.jdbc.Driver
    type: com.alibaba.druid.pool.DruidDataSource
server:
  port: 9010
eureka:
  instance:
    hostname: localhost
  client:
    service-url:
      defaultZone: http://${eureka.instance.hostname}:8761/eureka/
ribbon:
  eureka:
    enabled: true

CommonItemApplication.class

@SpringBootApplication
@EnableDiscoveryClient
@MapperScan("com.bzsc.mapper")
public class CommonItemApplication {
    public static void main(String[] args) {
        SpringApplication.run(CommonItemApplication.class,args);
    }
}

itemContorller.class

@RestController
@RequestMapping("/service/item")
public class ItemController {
    @Autowired
    ItemServiceImpl itemServiceImpl;
    @RequestMapping("/selectTbItemAllByPage")
    public PageResult selectTbItemAllByPage(@RequestParam("page") Integer page,@RequestParam("rows") Integer rows){
        return itemServiceImpl.selectTbItemAllByPage(page,rows);
    }
}

这里开始是消费者backerd-item的配置
application.yml

spring:
  application:
    name: backed-item
server:
  port: 9020
eureka:
  instance:
    hostname: localhost
  client:
    service-url:
      defaultZone: http://${eureka.instance.hostname}:8761/eureka/
    fetch-registry: true
    register-with-eureka: true
ribbon:
  eureka:
    enabled: true
CommonItemFeignClient:
  ribbon:
    listOfServers: http://localhost:9010

BackendItemApplication.class

@SpringBootApplication
@EnableDiscoveryClient
@EnableFeignClients
public class BackendItemApplication {
    public static void main(String[] args) {
        SpringApplication.run(BackendItemApplication.class,args);
    }
}

Feign客户端
CommonItemFeignClient.class

@FeignClient(name = "common-item")
public interface CommonItemFeignClient {
     @GetMapping("/service/item/selectTbItemAllByPage")
     PageResult selectTbItemAllByPage(@RequestParam("page") Integer page, @RequestParam("rows") Integer rows);

}

ItemController.class

@RestController
@RequestMapping("backend/item")
public class ItemController {
    @Autowired
    private ItemService itemService;
    @RequestMapping(value = "/selectTbItemAllByPage",method = RequestMethod.GET)
    public Result selecetTbItemAllByPage(@RequestParam(defaultValue = "1") Integer page,@RequestParam(defaultValue = "2") Integer rows){
        try {
            return this.itemService.selectTbItemAllByPage(page,rows);
        }catch (Exception e){
            e.printStackTrace();
        }
        return Result.build(500,"Error");
    }
}

怎么解决的？按照网上方法试了好几种，都不行。

解决了吗兄弟们，我已经给整麻了，想改用mq，但业务逻辑又必须处理完再返回才行，现在打算试试异步回调消息看能不能解决这个Bug

卧槽，发现问题了，是我服务方配置了一个登录拦截器，把我的feign请求拦截了，配置放行规则就好了

我用的是nacos 也出现的错误 我后来发现是环境隔离导致的 因为我的一个服务加了命名空间的 另外一个被调用的服务不在这个命名空间里面 所以会找不到服务

springcloud 新版本对ribbon支持不友好了，需要换成loadbalancer进行负载，就可以了。

Load balancer does not have available server for client: common-item
说明并没有找到common-item这个服务。
1、先看看注册中心是否有这个common-item服务，服务名称必须是common-item
2、然后去看看配置文件yml里面的服务名是否为common-item
3、再去看看启动日志，启动的是服务名是否为common-item

问题解决了吗？我也出现了相同的问题