SpringCloud整合nacos启动异常： Application failed to connect to Nacos server: "" Action: Please check you

柔情只为你懂 2023-05-21 07:18 53阅读 0赞

## 一. 背景 ##

在搭建`SpringCloud`整合`nacos`环境，服务有`springcloud-product`提供者和`springcloud-order`消费者，启动服务报异常如下：

2020-04-29 18:30:32.183  INFO 8228 --- [           main] trationDelegate$BeanPostProcessorChecker : Bean 'org.springframework.cloud.autoconfigure.ConfigurationPropertiesRebinderAutoConfiguration' of type [org.springframework.cloud.autoconfigure.ConfigurationPropertiesRebinderAutoConfiguration$$EnhancerBySpringCGLIB$$266b225b] is not eligible for getting processed by all BeanPostProcessors (for example: not eligible for auto-proxying)
    
      .   ____          _            __ _ _
     /\\ / ___'_ __ _ _(_)_ __ __ _ \ \ \ \ ( ( )\___ | '_ | '_| | '_ \/ _` | \ \ \ \
     \\/  ___)| |_)| | | | | || (_| |  ) ) ) )
      '  |____| .__|_| |_|_| |_\__, | / / / /
     =========|_|==============|___/=/_/_/_/
     :: Spring Boot ::        (v2.1.6.RELEASE)
    
    2020-04-29 18:30:33.078 ERROR 8228 --- [           main] o.s.b.d.LoggingFailureAnalysisReporter   : 
    
    ***************************
    APPLICATION FAILED TO START
    ***************************
    
    Description:
    
    Application failed to connect to Nacos server: ""
    
    Action:
    
    Please check your Nacos server config
    
    
    Process finished with exit code 1

检查项目配置，发现配置都是OK的，疑惑了半天，下面贴一下项目环境。

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L1RoaW5raW5nY2Fv_size_16_color_FFFFFF_t_70]

## 二. 项目配置 ##

### 1. 父工程依赖 ###

<?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">
        <modelVersion>4.0.0</modelVersion>
    
        <groupId>org.example</groupId>
        <artifactId>springcloud-ribbon-hystrix</artifactId>
        <packaging>pom</packaging>
        <version>1.0-SNAPSHOT</version>
        <modules>
            <module>springcloud-product</module>
            <module>springcloud-order</module>
        </modules>
    
        <properties>
            <project.build.sourceEncoding> UTF-8 </project.build.sourceEncoding>
            <project.reporting.outputEncoding> UTF-8 </project.reporting.outputEncoding>
            <java.version> 1.8 </java.version>
        </properties>
    
        <dependencyManagement>
            <dependencies>
                
                <dependency>
                    <groupId>org.springframework.cloud</groupId>
                    <artifactId>spring-cloud-dependencies</artifactId>
                    <version>Greenwich.SR2</version>
                    <type>pom</type>
                    <scope>import</scope>
                </dependency>
    
                
                <dependency>
                    <groupId>org.springframework.boot</groupId>
                    <artifactId>spring-boot-dependencies</artifactId>
                    <version>2.1.6.RELEASE</version>
                    <type>pom</type>
                    <scope>import</scope>
                </dependency>
    
                
                <dependency>
                    <groupId>com.alibaba.cloud</groupId>
                    <artifactId>spring-cloud-alibaba-dependencies</artifactId>
                    <version>2.1.1.RELEASE</version>
                    <type>pom</type>
                    <scope>import</scope>
                </dependency>
            </dependencies>
        </dependencyManagement>
    
    </project>

### 2. `springcloud-product`工程 ###

> 生产者springcloud-product和消费者springcloud-order依赖信息和配置基本一样，这里就贴springcloud-product的配置

<?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>springcloud-ribbon-hystrix</artifactId>
            <groupId>org.example</groupId>
            <version>1.0-SNAPSHOT</version>
        </parent>
        <modelVersion>4.0.0</modelVersion>
    
        <artifactId>springcloud-product</artifactId>
    
        <properties>
            <project.build.sourceEncoding> UTF-8 </project.build.sourceEncoding>
            <project.reporting.outputEncoding> UTF-8 </project.reporting.outputEncoding>
            <java.version> 1.8 </java.version>
        </properties>
    
        <dependencies>
            
            <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>
    
            
            <dependency>
                <groupId>com.alibaba.cloud</groupId>
                <artifactId>spring-cloud-starter-alibaba-nacos-discovery</artifactId>
            </dependency>
    
            
            <dependency>
                <groupId>com.alibaba.cloud</groupId>
                <artifactId>spring-cloud-starter-alibaba-nacos-config</artifactId>
            </dependency>
    
            
            <dependency>
                <groupId>com.alibaba.nacos</groupId>
                <artifactId>nacos-client</artifactId>
                <version>1.2.0</version>
            </dependency>
    
            
            <dependency>
                <groupId>org.springframework.cloud</groupId>
                <artifactId>spring-cloud-starter-netflix-hystrix</artifactId>
            </dependency>
    
            
            <dependency>
                <groupId>org.springframework.cloud</groupId>
                <artifactId>spring-cloud-starter-openfeign</artifactId>
            </dependency>
    
            
            <dependency>
                <groupId>org.projectlombok</groupId>
                <artifactId>lombok</artifactId>
            </dependency>
        </dependencies>
    </project>

### 3. `springcloud-product`工程 ###

server:
      port: 8013
    
    spring:
      application:
        name: nacos-product
      cloud:
        nacos:
          discovery:
            enabled: true
            server-addr: 130.252.102.241:8848
            register-enabled: true

### 4. 启动类ProductApp ###

package com.thinkingcao.product;
    
    import org.springframework.boot.SpringApplication;
    import org.springframework.cloud.client.SpringCloudApplication;
    
    /** * @desc: 商品服务-提供者 * @author: cao_wencao * @date: 2020-04-29 17:48 */
    @SpringCloudApplication
    public class ProductApp { 
        public static void main(String[] args) { 
            SpringApplication.run(ProductApp.class, args);
        }
    }

## 三. 原因总结 ##

*  在`application.yml`文件中我只配置了服务的注册与发现，并没有使用`nacos`的配置中心功能，但是我引用了`spring-cloud-starter-alibaba-nacos-config`这个包，是用来做配置中心的，这里要知道`nacos`为我们做了许多工作，在程序启动时，会动态的根据引入的依赖去加载初始对应的配置，无论是注册中心还是配置中心，所以我们既然没用到config的功能，就把这个依赖去掉。
 *  注意：  
    `SpringCloud`项目中如果引用了`nacos-discovery`或者`nacos-config`，都无需再像之前使用`Eureka`那样加入`@EnableDiscoveryClient`注解启用其服务的注册与发现相关功能，可以省略掉。

![在这里插入图片描述][20200429183713616.png]

## 四. 解决方式 ##

### 1. 第一种方式 ###

在pom.xml中去掉下面这个依赖

![在这里插入图片描述][20200429183713616.png]

### 2. 第二种方式 ###

新建`bootstrap.yml`，在`bootstrap.yml`中配置`nacos-config`的相关属性，这个属性是禁用`Nacos Config`自动配置，设置`spring.cloud.nacos.config.enabled = false`禁用`Spring Cloud Nacos`配置自动配置。

spring:
      cloud:
        nacos:
          config:
            enabled: false #禁用nacos-config自动配置功能

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L1RoaW5raW5nY2Fv_size_16_color_FFFFFF_t_70 1]

## 五. 参考文档阿里巴巴文档 ##

**Spring Cloud Alibaba参考文档：** **[Spring Cloud Alibaba参考文档][Spring Cloud Alibaba]**

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L1RoaW5raW5nY2Fv_size_16_color_FFFFFF_t_70 2]

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[20200429183713616.png]: /images/20230521/5aaa9c6ed17e4ff199de7088962b7751.png
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L1RoaW5raW5nY2Fv_size_16_color_FFFFFF_t_70 1]: /images/20230521/e7d066a6798145679c6944ac7af85bc5.png
[Spring Cloud Alibaba]: https://spring-cloud-alibaba-group.github.io/github-pages/greenwich/spring-cloud-alibaba.html#_more_information_about_nacos_discovery_starter_configurations
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L1RoaW5raW5nY2Fv_size_16_color_FFFFFF_t_70 2]: /images/20230521/9773cfc9df874bbdbf1b97edb62d39b4.png