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No instances available for xxxxxx

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No instances available for xxxxxx

问题描述

观看尚硅谷学习Spring Cloud Alibaba 出现的问题

消费者调用服务端出现

No instances available for nacos-payment-provider

问题出现的环境背景及自己尝试过哪些方法

百度过以下解决方法

  1. 添加@LoadBalanced注解，依旧出现此问题
  2. 测试9001的/PaymentController/nacos/{id}
    测试9002的/PaymentController/nacos/{id}
    可以访问
    但是使用83端口的restTemplate.getForObject()报错

相关代码

cloudalibaba-consumer-nacos-order83

<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0"
         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
    <parent>
        <artifactId>stu-spring-cloud</artifactId>
        <groupId>groupId</groupId>
        <version>1.0-SNAPSHOT</version>
    </parent>
    <modelVersion>4.0.0</modelVersion>

    <artifactId>cloudalibaba-consumer-nacos-order83</artifactId>

    <properties>
        <maven.compiler.source>15</maven.compiler.source>
        <maven.compiler.target>15</maven.compiler.target>
        <maven.compiler.compilerVersion>15</maven.compiler.compilerVersion>
    </properties>

    <dependencies>
        <!--Spring Cloud Alibaba Nacos-->
        <dependency>
            <groupId>com.alibaba.cloud</groupId>
            <artifactId>spring-cloud-starter-alibaba-nacos-discovery</artifactId>
        </dependency>

        <!--SPring boot-->
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>

        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-actuator</artifactId>
        </dependency>
    </dependencies>

</project>
package com;

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.cloud.client.discovery.EnableDiscoveryClient;

@SpringBootApplication
@EnableDiscoveryClient
public class CloudalibabaConsumerNacosOrder83 {

    public static void main(String[] args) {
        SpringApplication.run(CloudalibabaConsumerNacosOrder83.class, args);
    }
}
package com.config;

import com.netflix.client.config.DefaultClientConfigImpl;
import com.netflix.client.config.IClientConfig;
import org.springframework.cloud.client.loadbalancer.LoadBalanced;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.web.client.RestTemplate;

@Configuration
public class ApplicationConfig {

    @Bean
    IClientConfig iClientConfig() {
        DefaultClientConfigImpl config = new DefaultClientConfigImpl();
        return config;
    }

    @Bean
    @LoadBalanced
    public RestTemplate getRestTemplate() {
        return new RestTemplate();
    }
}
package com.controller;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.cloud.client.ServiceInstance;
import org.springframework.cloud.client.discovery.DiscoveryClient;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;
import org.springframework.web.client.RestTemplate;

import java.util.HashMap;
import java.util.List;
import java.util.Map;

@RestController
@RequestMapping("/OrderNacosController")
public class OrderNacosController {

    private RestTemplate restTemplate;

    private DiscoveryClient discoveryClient;

    private final Logger logger = LoggerFactory.getLogger(OrderNacosController.class);

    @Value("${service-url.nacos-user-service}")
    private String serverURL;

    @GetMapping("/paymentInfo/{id}")
    public String paymentInfo(@PathVariable("id") String id) {
        logger.info(serverURL + "/PaymentController/nacos/" + id);
        return restTemplate.getForObject(serverURL + "/PaymentController/nacos/" + id, String.class);
    }

    @GetMapping("/serviceurl")
    public Map<String, List<ServiceInstance>> serviceUrl() {
        Map<String, List<ServiceInstance>> msl = new HashMap<>();
        List<String> services = discoveryClient.getServices();
        for (String service : services) {
            List<ServiceInstance> sis = discoveryClient.getInstances(service);
            msl.put(service, sis);
        }
        return msl;
    }

    @Autowired
    public void setRestTemplate(RestTemplate restTemplate) {
        this.restTemplate = restTemplate;
    }

    @Autowired
    public void setDiscoveryClient(DiscoveryClient discoveryClient) {
        this.discoveryClient = discoveryClient;
    }
}

server:
  port: 83

spring:
  application:
    name: nacos-order-consumer
  cloud:
    nacos:
      discovery:
        server-addr: 120.79.200.201:9000

management:
  endpoints:
    web:
      exposure:
        include: '*'

service-url:
  nacos-user-service: http://nacos-payment-provider

cloudalibaba-provider-payment9001

<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0"
         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
    <parent>
        <artifactId>stu-spring-cloud</artifactId>
        <groupId>groupId</groupId>
        <version>1.0-SNAPSHOT</version>
    </parent>
    <modelVersion>4.0.0</modelVersion>

    <artifactId>cloudalibaba-provider-payment9001</artifactId>

    <properties>
        <maven.compiler.source>15</maven.compiler.source>
        <maven.compiler.target>15</maven.compiler.target>
        <maven.compiler.compilerVersion>15</maven.compiler.compilerVersion>
    </properties>

    <dependencies>
        <!--Spring Cloud Alibaba Nacos-->
        <dependency>
            <groupId>com.alibaba.cloud</groupId>
            <artifactId>spring-cloud-starter-alibaba-nacos-discovery</artifactId>
            <version>2.2.3.RELEASE</version>
        </dependency>

        <!--SPring boot-->
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>

        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-actuator</artifactId>
        </dependency>
    </dependencies>

</project>
package com.controller;

import org.springframework.beans.factory.annotation.Value;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;

@RestController
@RequestMapping("/PaymentController")
public class PaymentController {

    @Value("${server.port}")
    private String serverPort;

    @GetMapping("/nacos/{id}")
    public String getPayment(@PathVariable("id") String id) {
        return "nacos registry, serverPort: " + serverPort + " id: " + id;
    }
}

cloudalibaba-provider-payment9002

<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0"
         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
    <parent>
        <artifactId>stu-spring-cloud</artifactId>
        <groupId>groupId</groupId>
        <version>1.0-SNAPSHOT</version>
    </parent>
    <modelVersion>4.0.0</modelVersion>

    <artifactId>cloudalibaba-provider-payment9001</artifactId>

    <properties>
        <maven.compiler.source>15</maven.compiler.source>
        <maven.compiler.target>15</maven.compiler.target>
        <maven.compiler.compilerVersion>15</maven.compiler.compilerVersion>
    </properties>

    <dependencies>
        <!--Spring Cloud Alibaba Nacos-->
        <dependency>
            <groupId>com.alibaba.cloud</groupId>
            <artifactId>spring-cloud-starter-alibaba-nacos-discovery</artifactId>
            <version>2.2.3.RELEASE</version>
        </dependency>

        <!--SPring boot-->
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>

        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-actuator</artifactId>
        </dependency>
    </dependencies>

</project>
package com.controller;

import org.springframework.beans.factory.annotation.Value;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;

@RestController
@RequestMapping("/PaymentController")
public class PaymentController {

    @Value("${server.port}")
    private String serverPort;

    @GetMapping("/nacos/{id}")
    public String getPayment(@PathVariable("id") String id) {
        return "nacos registry, serverPort: " + serverPort + " id: " + id;
    }
}

image
Nacos 已经注册完成

你期待的结果是什么？实际看到的错误信息又是什么？

期待的结果是可以成功调用服务

实际错误信息：

java.lang.IllegalStateException: No instances available for nacos-payment-provider
    at org.springframework.cloud.netflix.ribbon.RibbonLoadBalancerClient.execute(RibbonLoadBalancerClient.java:119) ~[spring-cloud-netflix-ribbon-2.2.5.RELEASE.jar:2.2.5.RELEASE]
    at org.springframework.cloud.netflix.ribbon.RibbonLoadBalancerClient.execute(RibbonLoadBalancerClient.java:99) ~[spring-cloud-netflix-ribbon-2.2.5.RELEASE.jar:2.2.5.RELEASE]
    at org.springframework.cloud.client.loadbalancer.LoadBalancerInterceptor.intercept(LoadBalancerInterceptor.java:58) ~[spring-cloud-commons-2.2.5.RELEASE.jar:2.2.5.RELEASE]
    at org.springframework.http.client.InterceptingClientHttpRequest$InterceptingRequestExecution.execute(InterceptingClientHttpRequest.java:93) ~[spring-web-5.2.10.RELEASE.jar:5.2.10.REL

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1 Answer

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by (71.8m points)

问题已经解决：
解决方式：
因为我包名层级只有一层 com下就直接是启动类，将包名更改为com.xxxx再运行就可以解决这个问题


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