如何出现这个报错，我想将一个 boot 项目注册到 Eureka 上

添加了依赖

 <dependency>
    <groupId>org.springframework.cloud</groupId>
    <artifactId>spring-cloud-starter-netflix-eureka-server</artifactId>
    <version>2.0.2.RELEASE</version>
 </dependency>

配置文件参数

eureka:
  client:
    service-url:
      defaultZone: http://192.168.1.9:18000/eureka/
    enabled: true
  instance:
    prefer-ip-address: true
    instance-id: ${spring.application.name}:${server.port}}
    lease-renewal-interval-in-seconds: 10
    lease-expiration-duration-in-seconds: 30

添加 @EnableEurekaClient 注解

报错信息 

经过排查发现 spring cloud 的版本没有配置,添加以下版本管理配置

<properties>
    <spring-cloud.version>Finchley.SR2</spring-cloud.version>
    <spring.boot.version>2.1.5.RELEASE</spring.boot.version>
</properties>
 <dependencyManagement>
      <dependencies>
            <dependency>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-dependencies</artifactId>
                <version>${spring.boot.version}</version>
                <type>pom</type>
                <scope>import</scope>
            </dependency>
            <dependency>
                <groupId>io.spring.platform</groupId>
                <artifactId>platform-bom</artifactId>
                <version>${spring.platform.version}</version>
                <type>pom</type>
                <scope>import</scope>
            </dependency>
            <dependency>
                <groupId>org.springframework.cloud</groupId>
                <artifactId>spring-cloud-dependencies</artifactId>
                <version>${spring-cloud.version}</version>
                <type>pom</type>
                <scope>import</scope>
            </dependency>
        </dependencies>
    </dependencyManagement>

 OK! 启动成功