Я выполняю балансировку нагрузки на стороне клиента с помощью ленточного клиента. я внедряю микро сервис весенней загрузки 2.2.6. У меня есть ЧАТ-КНИГА и ПОЛЬЗОВАТЕЛЬ-ПРИЛОЖЕНИЕ две микро-службы. Я добавил необходимые зависимости (spring-boot-starter-web) в CHAT-BOOK (spring-boot-starter-web, spring-cloud-starter-netflix-tape) Микро-сервис USER-APP в pom. xml.
CHAT-BOOK microservice:
@RestController
@RequestMapping("/chatbook")
public class ChatbookController {
@Value("${server.port}")
private String port;
@GetMapping("/chatnow")
public String chat() {
return "application up on port: " + port;
}
}
USER-APP microservice:
I have added below properties in application.properties.
CHAT-BOOK.ribbon.listOfServers=localhost:8081,localhost:8082,localhost:8083
CHAT-BOOK.ribbon.eureka.enabled=false
server.port=9090
UserAppApplication class:
@SpringBootApplication
@RibbonClient(name = "CHAT-BOOK", configuration = RibbonConfiguration.class)
public class UserAppApplication {
@Bean
@LoadBalanced
public RestTemplate getTemplate() {
return new RestTemplate();
}
public static void main(String[] args) {
SpringApplication.run(UserAppApplication.class, args);
}
}
RibbonConfiguration.java
public class RibbonConfiguration {
@Autowired
IClientConfig ribbonClient;
@Bean
public IPing ping(IClientConfig ribbonClient) {
return new PingUrl();
}
@Bean
public IRule rule(IClientConfig ribbonClient) {
return new AvailabilityFilteringRule();
}
}
UserContoller.java
@RestController
public class UserContoller {
@Autowired
private RestTemplate template;
@GetMapping("/invoke")
public String invokeChatbook() {
String url = "http://CHAT-BOOK/chatbook/chatnow";
return template.getForObject(url, String.class);
}
}
Ссылочный URL:
https://www.youtube.com/watch?v=ueyVjOnDHYQ&list=PLVz2XdJiJQxz3L2Onpxbel6r72IDdWrJh&index=3
Когда я запускаю над приложением, я получаю ошибки ниже.
2020-04-14 11:27:50.013 WARN 9996 --- [nio-9090-exec-5] com.netflix.loadbalancer.RoundRobinRule : No up servers available from load balancer: DynamicServerListLoadBalancer:{NFLoadBalancer:name=CHAT-BOOK,current list of Servers=[localhost:8081, localhost:8082, localhost:8083],Load balancer stats=Zone stats: {unknown=[Zone:unknown; Instance count:3; Active connections count: 0; Circuit breaker tripped count: 0; Active connections per server: 0.0;]
},Server stats: [[Server:localhost:8081; Zone:UNKNOWN; Total Requests:0; Successive connection failure:0; Total blackout seconds:0; Last connection made:Thu Jan 01 05:30:00 IST 1970; First connection made: Thu Jan 01 05:30:00 IST 1970; Active Connections:0; total failure count in last (1000) msecs:0; average resp time:0.0; 90 percentile resp time:0.0; 95 percentile resp time:0.0; min resp time:0.0; max resp time:0.0; stddev resp time:0.0]
, [Server:localhost:8082; Zone:UNKNOWN; Total Requests:0; Successive connection failure:0; Total blackout seconds:0; Last connection made:Thu Jan 01 05:30:00 IST 1970; First connection made: Thu Jan 01 05:30:00 IST 1970; Active Connections:0; total failure count in last (1000) msecs:0; average resp time:0.0; 90 percentile resp time:0.0; 95 percentile resp time:0.0; min resp time:0.0; max resp time:0.0; stddev resp time:0.0]
, [Server:localhost:8083; Zone:UNKNOWN; Total Requests:0; Successive connection failure:0; Total blackout seconds:0; Last connection made:Thu Jan 01 05:30:00 IST 1970; First connection made: Thu Jan 01 05:30:00 IST 1970; Active Connections:0; total failure count in last (1000) msecs:0; average resp time:0.0; 90 percentile resp time:0.0; 95 percentile resp time:0.0; min resp time:0.0; max resp time:0.0; stddev resp time:0.0]
]}ServerList:com.netflix.loadbalancer.ConfigurationBasedServerList@387e7238
2020-04-14 11:27:50.016 WARN 9996 --- [nio-9090-exec-5] c.netflix.loadbalancer.BaseLoadBalancer : LoadBalancer [CHAT-BOOK]: Error choosing server for key default
Я использую три сервера (8081, 8082, 8083). но он показывает Нет доступных серверов от балансировщика нагрузки.
Ошибка1:
java.lang.NullPointerException: null
at com.google.common.base.Preconditions.checkNotNull(Preconditions.java:890) ~[guava-28.2-android.jar:na]
at com.google.common.cache.LocalCache.get(LocalCache.java:3848) ~[guava-28.2-android.jar:na]
at com.google.common.cache.LocalCache.getOrLoad(LocalCache.java:3873) ~[guava-28.2-android.jar:na]
at com.google.common.cache.LocalCache$LocalLoadingCache.get(LocalCache.java:4798) ~[guava-28.2-android.jar:na]
at com.netflix.loadbalancer.LoadBalancerStats.getServerStats(LoadBalancerStats.java:185) ~[ribbon-loadbalancer-2.3.0.jar:2.3.0]
at com.netflix.loadbalancer.LoadBalancerStats.getSingleServerStat(LoadBalancerStats.java:372) ~[ribbon-loadbalancer-2.3.0.jar:2.3.0]
at com.netflix.loadbalancer.AvailabilityPredicate.apply(AvailabilityPredicate.java:73) ~[ribbon-loadbalancer-2.3.0.jar:2.3.0]
at com.netflix.loadbalancer.AvailabilityPredicate.apply(AvailabilityPredicate.java:35) ~[ribbon-loadbalancer-2.3.0.jar:2.3.0]
at com.netflix.loadbalancer.CompositePredicate.apply(CompositePredicate.java:52) ~[ribbon-loadbalancer-2.3.0.jar:2.3.0]
at com.netflix.loadbalancer.CompositePredicate.apply(CompositePredicate.java:40) ~[ribbon-loadbalancer-2.3.0.jar:2.3.0]
at com.netflix.loadbalancer.AvailabilityFilteringRule.choose(AvailabilityFilteringRule.java:86) ~[ribbon-loadbalancer-2.3.0.jar:2.3.0]
at com.netflix.loadbalancer.BaseLoadBalancer.chooseServer(BaseLoadBalancer.java:755) ~[ribbon-loadbalancer-2.3.0.jar:2.3.0]
at com.netflix.loadbalancer.ZoneAwareLoadBalancer.chooseServer(ZoneAwareLoadBalancer.java:113) [ribbon-loadbalancer-2.3.0.jar:2.3.0]
at org.springframework.cloud.netflix.ribbon.RibbonLoadBalancerClient.getServer(RibbonLoadBalancerClient.java:189) [spring-cloud-netflix-ribbon-2.2.2.RELEASE.jar:2.2.2.RELEASE]....
Ошибка2:
java.lang.IllegalStateException: No instances available for CHAT-BOOK
at org.springframework.cloud.netflix.ribbon.RibbonLoadBalancerClient.execute(RibbonLoadBalancerClient.java:119) ~[spring-cloud-netflix-ribbon-2.2.2.RELEASE.jar:2.2.2.RELEASE]
at org.springframework.cloud.netflix.ribbon.RibbonLoadBalancerClient.execute(RibbonLoadBalancerClient.java:99) ~[spring-cloud-netflix-ribbon-2.2.2.RELEASE.jar:2.2.2.RELEASE]
at org.springframework.cloud.client.loadbalancer.LoadBalancerInterceptor.intercept(LoadBalancerInterceptor.java:58) ~[spring-cloud-commons-2.2.2.RELEASE.jar:2.2.2.RELEASE]
at org.springframework.http.client.InterceptingClientHttpRequest$InterceptingRequestExecution.execute(InterceptingClientHttpRequest.java:93) ~[spring-web-5.2.5.RELEASE.jar:5.2.5.RELEASE]
at org.springframework.http.client.InterceptingClientHttpRequest.executeInternal(InterceptingClientHttpRequest.java:77) ~[spring-web-5.2.5.RELEASE.jar:5.2.5.RELEASE]
at org.springframework.http.client.AbstractBufferingClientHttpRequest.executeInternal(AbstractBufferingClientHttpRequest.java:48) ~[spring-web-5.2.5.RELEASE.jar:5.2.5.RELEASE]
at org.springframework.http.client.AbstractClientHttpRequest.execute(AbstractClientHttpRequest.java:53) ~[spring-web-5.2.5.RELEASE.jar:5.2.5.RELEASE]
at org.springframework.web.client.RestTemplate.doExecute(RestTemplate.java:739) ~[spring-web-5.2.5.RELEASE.jar:5.2.5.RELEASE]
at org.springframework.web.client.RestTemplate.execute(RestTemplate.java:674) ~[spring-web-5.2.5.RELEASE.jar:5.2.5.RELEASE]
at org.springframework.web.client.RestTemplate.getForObject(RestTemplate.java:315) ~[spring-web-5.2.5.RELEASE.jar:5.2.5.RELEASE]
at com.loadbalanced.api.UserContoller.invokeChatbook(UserContoller.java:17) ~[classes/:na]
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[na:1.8.0_231]
at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source) ~[na:1.8.0_231]
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source) ~[na:1.8.0_231]
at java.lang.reflect.Method.invoke(Unknown Source) ~[na:1.8.0_231]
at org.springframework.web.method.support.InvocableHandlerMethod.doInvoke(InvocableHandlerMethod.java:190) ~[spring-web-5.2.5.RELEASE.jar:5.2.5.RELEASE]
at org.springframework.web.method.support.InvocableHandlerMethod.invokeForRequest(InvocableHandlerMethod.java:138) ~[spring-web-5.2.5.RELEASE.jar:5.2.5.RELEASE]
at org.springframework.web.servlet.mvc.method.annotation.ServletInvocableHandlerMethod.invokeAndHandle(ServletInvocableHandlerMethod.java:105) ~[spring-webmvc-5.2.5.RELEASE.jar:5.2.5.RELEASE]
at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.invokeHandlerMethod(RequestMappingHandlerAdapter.java:879) ~[spring-webmvc-5.2.5.RELEASE.jar:5.2.5.RELEASE]
at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.handleInternal(RequestMappingHandlerAdapter.java:793) ~[spring-webmvc-5.2.5.RELEASE.jar:5.2.5.RELEASE]
at org.springframework.web.servlet.mvc.method.AbstractHandlerMethodAdapter.handle(AbstractHandlerMethodAdapter.java:87) ~[spring-webmvc-5.2.5.RELEASE.jar:5.2.5.RELEASE]
at org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:1040) ~[spring-webmvc-5.2.5.RELEASE.jar:5.2.5.RELEASE]
at org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:943) ~[spring-webmvc-5.2.5.RELEASE.jar:5.2.5.RELEASE]
at org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:1006) ~[spring-webmvc-5.2.5.RELEASE.jar:5.2.5.RELEASE]
at org.springframework.web.servlet.FrameworkServlet.doGet(FrameworkServlet.java:898) ~[spring-webmvc-5.2.5.RELEASE.jar:5.2.5.RELEASE]
at javax.servlet.http.HttpServlet.service(HttpServlet.java:634) ~[tomcat-embed-core-9.0.33.jar:9.0.33].....
Может кто-нибудь предложить мне, как решить эту проблему Вышеуказанные вопросы.
Заранее спасибо