目的

Spring Cloud的服务注册与发现（Service Registration and Discovery ），是通过Netflix Eureka 来实现的。服务注册的意义在于，实现了客户端的负载均衡，并解耦了服务提供方与消费方。本次实验主要是搭建eureka服务端与客户端，通过配置，实现服务注册与发现功能。

环境条件

eclipse Oxygen(4.7.0), with Maven, Spring Tools插件

实验过程记录

创建 maven project

首先通过eclipse创建maven project，然后再其内部创建maven module 2个，分别是eureka server和client。

修改eureka服务端pom

eureka server module的pom，修改后如下：

<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>

    <artifactId>demo-eureka-server</artifactId>
    <name>eureka-server</name>
    <description>Demo test project for spring cloud</description>
    <packaging>jar</packaging>

    <parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>1.5.6.RELEASE</version>
        <relativePath/> <!-- lookup parent from repository -->
    </parent>

    <properties>
        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
        <project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
        <java.version>1.8</java.version>
        <!-- <spring-cloud.version>Dalston.SR2</spring-cloud.version> -->
        <spring-cloud.version>Camden.SR5</spring-cloud.version>
    </properties>

    <dependencies>
        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-starter</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-starter-eureka-server</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
            <scope>test</scope>
        </dependency>
        <!-- 以下依赖项在官方demo中不存在，因为本地启动后DiscoveryClient初始化时一直报找不到类，所以才加上去的。具体见总结部分 -->
        <dependency>
            <groupId>com.google.guava</groupId>
            <artifactId>guava</artifactId>
        </dependency>
        <dependency>
          <groupId>com.diffplug.guava</groupId>
          <artifactId>guava-cache</artifactId>
          <version>19.0.0</version>
        </dependency>
    </dependencies>

    <dependencyManagement>
        <dependencies>
            <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>

    <build>
        <plugins>
            <plugin>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-maven-plugin</artifactId>
            </plugin>
        </plugins>
    </build>

    <repositories>
        <repository>
            <id>spring-milestones</id>
            <name>Spring Milestones</name>
            <url>https://repo.spring.io/milestone</url>
            <snapshots>
                <enabled>false</enabled>
            </snapshots>
        </repository>
    </repositories>

</project>
编写EurekaServer启动类及注解

通过@EnableEurekaServer 和 @SpringBootApplication注解来实现启动类。

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.cloud.netflix.eureka.server.EnableEurekaServer;

@EnableEurekaServer
@SpringBootApplication
public class EurekaServerApplication {

    public static void main(String[] args) {
        SpringApplication.run(EurekaServerApplication.class, args);
    }
}

@EnableEurekaServer: 该注解表明应用为eureka服务，有可以联合多个服务作为集群，对外提供服务注册以及发现功能

服务端参数配置

通过application.yml 实现参数配置：

server:
  port: 8761

eureka:
  instance:
    hostname: localhost
  client:
    registerWithEureka: false
    fetchRegistry: false
    serviceUrl:
      defaultZone: http://${eureka.instance.hostname}:${server.port}/eureka/

此处，通过registerWithEureka和 fetchRegistry 设置为false，将当前eureka作为服务端。

启动eureka服务

运行 EurekaServerApplication.java（以java application或springboot app方式执行均可），即可看到启动过程，启动完毕后，可访问 http://localhost:8761，看到spring Eureka服务端状态页面：
这里写图片描述
其中，Instances currently registered with Eureka 即已注册到Eureka的客户端数量。

创建eureka客户端

eureka client maven module的pom文件如下：

<?xml version="1.0"?>
<project xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd" xmlns="http://maven.apache.org/POM/4.0.0"
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
    <modelVersion>4.0.0</modelVersion>

    <artifactId>demo-eureka-client</artifactId>
    <version>0.0.1-SNAPSHOT</version>
    <name>demo-eureka-client</name>
    <description>eureka client example</description>
    <packaging>jar</packaging>

    <parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>1.5.6.RELEASE</version>
        <relativePath/> <!-- lookup parent from repository -->
    </parent>

    <properties>
        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
        <project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
        <java.version>1.8</java.version>
        <spring-cloud.version>Dalston.SR2</spring-cloud.version>
        <!-- <spring-cloud.version>Camden.SR5</spring-cloud.version> -->
    </properties>

    <dependencies>
        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-starter-eureka</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-starter</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-starter-eureka-server</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
            <scope>test</scope>
        </dependency>
        <dependency>
            <groupId>com.google.guava</groupId>
            <artifactId>guava</artifactId>
        </dependency>
        <dependency>
          <groupId>com.diffplug.guava</groupId>
          <artifactId>guava-cache</artifactId>
          <version>19.0.0</version>
        </dependency>
    </dependencies>

    <dependencyManagement>
        <dependencies>
            <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>

    <build>
        <plugins>
            <plugin>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-maven-plugin</artifactId>
            </plugin>
        </plugins>
    </build>

    <repositories>
        <repository>
            <id>spring-milestones</id>
            <name>Spring Milestones</name>
            <url>https://repo.spring.io/milestone</url>
            <snapshots>
                <enabled>false</enabled>
            </snapshots>
        </repository>
    </repositories>
</project>
编写eureka客户端启动类及注解
package org.demo.eureka.client;

import java.util.List;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.EnableAutoConfiguration;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.boot.builder.SpringApplicationBuilder;
import org.springframework.cloud.client.ServiceInstance;
import org.springframework.cloud.client.discovery.DiscoveryClient;
import org.springframework.cloud.netflix.eureka.EnableEurekaClient;
import org.springframework.context.annotation.ComponentScan;
import org.springframework.context.annotation.Configuration;
import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;

@Configuration
@ComponentScan
@EnableAutoConfiguration
@EnableEurekaClient
@RestController
public class EurekaClientApplication {

    @RequestMapping("/")
    public String home() {
        return "Hello World";
    }

    /**
     * @param args
     */
    public static void main(String[] args) {
//      new SpringApplicationBuilder(EurekaClientApplication.class).web(true).run(args);
        SpringApplication.run(EurekaClientApplication.class, args);
    }

}

@RestController
class ServiceInstanceRestController {

    @Autowired
    private DiscoveryClient discoveryClient;

    @RequestMapping("/service-instances/{applicationName}")
    public List<ServiceInstance> serviceInstancesByApplicationName(
            @PathVariable String applicationName) {
        return this.discoveryClient.getInstances(applicationName);
    }
}
客户端参数配置

bootstrap.yml

spring:
  application:
    name: eureka-client

application.yml

eureka:
  enabled: true
#  instance:
#  appname: eureka.client.01
  client:
    registerWithEureka: true
    fetchRegistry: true
    serviceUrl:
      defaultZone: http://localhost:8761/eureka/
启动客户端并查看运行情况

待正常启动eureka客户端后，访问网页：
http://localhost:8080/
这里写图片描述

访问链接：http://localhost:8080/service-instance/eureka-client
这里写图片描述

查看注册中心状态，发现存在已注册实例：
这里写图片描述

总结

服务端与客户端注解

服务端注解@EnableEurekaServer，在Springboot应用中加上后，即可启动一个eureka服务端。该服务端会接收客户端的心跳检测，并通过网页UI显示已注册的客户端的状态信息。
客户端注解可以用@EnableEurekaClient。同时，也可以换成用@EnableDiscoveryClient注解（仅限于Eureka，Spring官方资料原文：In this example we use @EnableEurekaClient explicitly, but with only Eureka available you could also use @EnableDiscoveryClient）。
关于Eureka的服务注册、服务续约、服务下线、服务删除、服务注册列表获取等更多信息，可参考：深入理解Eureka之源码解析

关于eureka服务部署

服务的部署方式：一般可以将eureka工程打成war包，发布到tomcat容器中即可。为保持高可用，eureka server一般以集群方式部署。eureka client客户端，通过向服务端注册成功后，方可向外部提供某种特定业务或系统功能的服务。

遇到的问题

按照官方参考pom配置后，eureka server启动报错：

Error starting ApplicationContext. To display the auto-configuration report re-run your application with 'debug' enabled.
2017-07-29 00:17:10.065 ERROR 3432 --- [           main] o.s.boot.SpringApplication               : Application startup failed

org.springframework.beans.factory.UnsatisfiedDependencyException: Error creating bean with name 'org.springframework.cloud.netflix.eureka.server.EurekaServerInitializerConfiguration': Unsatisfied dependency expressed through field 'eurekaServerBootstrap'; nested exception is org.springframework.beans.factory.UnsatisfiedDependencyException: Error creating bean with name 'eurekaServerBootstrap' defined in class path resource [org/springframework/cloud/netflix/eureka/server/EurekaServerAutoConfiguration.class]: Unsatisfied dependency expressed through method 'eurekaServerBootstrap' parameter 0; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'peerAwareInstanceRegistry' defined in class path resource [org/springframework/cloud/netflix/eureka/server/EurekaServerAutoConfiguration.class]: Bean instantiation via factory method failed; nested exception is org.springframework.beans.BeanInstantiationException: Failed to instantiate [com.netflix.eureka.registry.PeerAwareInstanceRegistry]: Factory method 'peerAwareInstanceRegistry' threw exception; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'scopedTarget.eurekaClient' defined in class path resource [org/springframework/cloud/netflix/eureka/EurekaClientAutoConfiguration$RefreshableEurekaClientConfiguration.class]: Bean instantiation via factory method failed; nested exception is org.springframework.beans.BeanInstantiationException: Failed to instantiate [com.netflix.discovery.EurekaClient]: Factory method 'eurekaClient' threw exception; nested exception is java.lang.NoClassDefFoundError: com/google/common/base/Function
    at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor$AutowiredFieldElement.inject(AutowiredAnnotationBeanPostProcessor.java:588) ~[spring-beans-4.3.10.RELEASE.jar:4.3.10.RELEASE]
    ...[此处有省略]
    at org.springframework.boot.SpringApplication.run(SpringApplication.java:1107) [spring-boot-1.5.6.RELEASE.jar:1.5.6.RELEASE]
    at com.example.demo.EurekaServerApplication.main(EurekaServerApplication.java:19) [classes/:na]
Caused by: org.springframework.beans.factory.UnsatisfiedDependencyException: Error creating bean with name 'eurekaServerBootstrap' defined in class path resource [org/springframework/cloud/netflix/eureka/server/EurekaServerAutoConfiguration.class]: Unsatisfied dependency expressed through method 'eurekaServerBootstrap' parameter 0; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'peerAwareInstanceRegistry' defined in class path resource [org/springframework/cloud/netflix/eureka/server/EurekaServerAutoConfiguration.class]: Bean instantiation via factory method failed; nested exception is org.springframework.beans.BeanInstantiationException: Failed to instantiate [com.netflix.eureka.registry.PeerAwareInstanceRegistry]: Factory method 'peerAwareInstanceRegistry' threw exception; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'scopedTarget.eurekaClient' defined in class path resource [org/springframework/cloud/netflix/eureka/EurekaClientAutoConfiguration$RefreshableEurekaClientConfiguration.class]: Bean instantiation via factory method failed; nested exception is org.springframework.beans.BeanInstantiationException: Failed to instantiate [com.netflix.discovery.EurekaClient]: Factory method 'eurekaClient' threw exception; nested exception is java.lang.NoClassDefFoundError: com/google/common/base/Function
    at org.springframework.beans.factory.support.ConstructorResolver.createArgumentArray(ConstructorResolver.java:749) ~[spring-beans-4.3.10.RELEASE.jar:4.3.10.RELEASE]
    at org.springframework.beans.factory.support.ConstructorResolver.instantiateUsingFactoryMethod(ConstructorResolver.java:467) ~[spring-beans-4.3.10.RELEASE.jar:4.3.10.RELEASE]
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.instantiateUsingFactoryMethod(AbstractAutowireCapableBeanFactory.java:1173) ~[spring-beans-4.3.10.RELEASE.jar:4.3.10.RELEASE]
    ...[此处有省略]
    ... 19 common frames omitted
Caused by: org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'peerAwareInstanceRegistry' defined in class path resource [org/springframework/cloud/netflix/eureka/server/EurekaServerAutoConfiguration.class]: Bean instantiation via factory method failed; nested exception is org.springframework.beans.BeanInstantiationException: Failed to instantiate [com.netflix.eureka.registry.PeerAwareInstanceRegistry]: Factory method 'peerAwareInstanceRegistry' threw exception; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'scopedTarget.eurekaClient' defined in class path resource [org/springframework/cloud/netflix/eureka/EurekaClientAutoConfiguration$RefreshableEurekaClientConfiguration.class]: Bean instantiation via factory method failed; nested exception is org.springframework.beans.BeanInstantiationException: Failed to instantiate [com.netflix.discovery.EurekaClient]: Factory method 'eurekaClient' threw exception; nested exception is java.lang.NoClassDefFoundError: com/google/common/base/Function
    at org.springframework.beans.factory.support.ConstructorResolver.instantiateUsingFactoryMethod(ConstructorResolver.java:599) ~[spring-beans-4.3.10.RELEASE.jar:4.3.10.RELEASE]
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.instantiateUsingFactoryMethod(AbstractAutowireCapableBeanFactory.java:1173) ~[spring-beans-4.3.10.RELEASE.jar:4.3.10.RELEASE]
    ...[此处有省略]
Caused by: org.springframework.beans.BeanInstantiationException: Failed to instantiate [com.netflix.eureka.registry.PeerAwareInstanceRegistry]: Factory method 'peerAwareInstanceRegistry' threw exception; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'scopedTarget.eurekaClient' defined in class path resource [org/springframework/cloud/netflix/eureka/EurekaClientAutoConfiguration$RefreshableEurekaClientConfiguration.class]: Bean instantiation via factory method failed; nested exception is org.springframework.beans.BeanInstantiationException: Failed to instantiate [com.netflix.discovery.EurekaClient]: Factory method 'eurekaClient' threw exception; nested exception is java.lang.NoClassDefFoundError: com/google/common/base/Function
    at org.springframework.beans.factory.support.SimpleInstantiationStrategy.instantiate(SimpleInstantiationStrategy.java:189) ~[spring-beans-4.3.10.RELEASE.jar:4.3.10.RELEASE]
    at org.springframework.beans.factory.support.ConstructorResolver.instantiateUsingFactoryMethod(ConstructorResolver.java:588) ~[spring-beans-4.3.10.RELEASE.jar:4.3.10.RELEASE]
    ... 45 common frames omitted
Caused by: org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'scopedTarget.eurekaClient' defined in class path resource [org/springframework/cloud/netflix/eureka/EurekaClientAutoConfiguration$RefreshableEurekaClientConfiguration.class]: Bean instantiation via factory method failed; nested exception is org.springframework.beans.BeanInstantiationException: Failed to instantiate [com.netflix.discovery.EurekaClient]: Factory method 'eurekaClient' threw exception; nested exception is java.lang.NoClassDefFoundError: com/google/common/base/Function
    at org.springframework.beans.factory.support.ConstructorResolver.instantiateUsingFactoryMethod(ConstructorResolver.java:599) ~[spring-beans-4.3.10.RELEASE.jar:4.3.10.RELEASE]
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.instantiateUsingFactoryMethod(AbstractAutowireCapableBeanFactory.java:1173) ~[spring-beans-4.3.10.RELEASE.jar:4.3.10.RELEASE]
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBeanInstance(AbstractAutowireCapableBeanFactory.java:1067) ~[spring-beans-4.3.10.RELEASE.jar:4.3.10.RELEASE]
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:513) ~[spring-beans-4.3.10.RELEASE.jar:4.3.10.RELEASE]
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:483) ~[spring-beans-4.3.10.RELEASE.jar:4.3.10.RELEASE]
    at org.springframework.beans.factory.support.AbstractBeanFactory$2.getObject(AbstractBeanFactory.java:345) ~[spring-beans-4.3.10.RELEASE.jar:4.3.10.RELEASE]
    at org.springframework.cloud.context.scope.GenericScope$BeanLifecycleWrapper.getBean(GenericScope.java:359) ~[spring-cloud-context-1.2.3.RELEASE.jar:1.2.3.RELEASE]
    at org.springframework.cloud.context.scope.GenericScope.get(GenericScope.java:176) ~[spring-cloud-context-1.2.3.RELEASE.jar:1.2.3.RELEASE]
    at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:340) ~[spring-beans-4.3.10.RELEASE.jar:4.3.10.RELEASE]
    at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:197) ~[spring-beans-4.3.10.RELEASE.jar:4.3.10.RELEASE]
    at org.springframework.aop.target.SimpleBeanTargetSource.getTarget(SimpleBeanTargetSource.java:35) ~[spring-aop-4.3.10.RELEASE.jar:4.3.10.RELEASE]
    at org.springframework.aop.framework.JdkDynamicAopProxy.invoke(JdkDynamicAopProxy.java:192) ~[spring-aop-4.3.10.RELEASE.jar:4.3.10.RELEASE]
    at com.sun.proxy.$Proxy78.getApplications(Unknown Source) ~[na:na]
    at org.springframework.cloud.netflix.eureka.server.EurekaServerAutoConfiguration.peerAwareInstanceRegistry(EurekaServerAutoConfiguration.java:161) ~[spring-cloud-netflix-eureka-server-1.3.2.RELEASE.jar:1.3.2.RELEASE]
    at org.springframework.cloud.netflix.eureka.server.EurekaServerAutoConfiguration$$EnhancerBySpringCGLIB$$4364068c.CGLIB$peerAwareInstanceRegistry$6(<generated>) ~[spring-cloud-netflix-eureka-server-1.3.2.RELEASE.jar:1.3.2.RELEASE]
    at org.springframework.cloud.netflix.eureka.server.EurekaServerAutoConfiguration$$EnhancerBySpringCGLIB$$4364068c$$FastClassBySpringCGLIB$$e392c4ae.invoke(<generated>) ~[spring-cloud-netflix-eureka-server-1.3.2.RELEASE.jar:1.3.2.RELEASE]
    at org.springframework.cglib.proxy.MethodProxy.invokeSuper(MethodProxy.java:228) ~[spring-core-4.3.10.RELEASE.jar:4.3.10.RELEASE]
    at org.springframework.context.annotation.ConfigurationClassEnhancer$BeanMethodInterceptor.intercept(ConfigurationClassEnhancer.java:358) ~[spring-context-4.3.10.RELEASE.jar:4.3.10.RELEASE]
    at org.springframework.cloud.netflix.eureka.server.EurekaServerAutoConfiguration$$EnhancerBySpringCGLIB$$4364068c.peerAwareInstanceRegistry(<generated>) ~[spring-cloud-netflix-eureka-server-1.3.2.RELEASE.jar:1.3.2.RELEASE]
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[na:1.8.0_131]
    at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source) ~[na:1.8.0_131]
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source) ~[na:1.8.0_131]
    at java.lang.reflect.Method.invoke(Unknown Source) ~[na:1.8.0_131]
    at org.springframework.beans.factory.support.SimpleInstantiationStrategy.instantiate(SimpleInstantiationStrategy.java:162) ~[spring-beans-4.3.10.RELEASE.jar:4.3.10.RELEASE]
    ... 46 common frames omitted
Caused by: org.springframework.beans.BeanInstantiationException: Failed to instantiate [com.netflix.discovery.EurekaClient]: Factory method 'eurekaClient' threw exception; nested exception is java.lang.NoClassDefFoundError: com/google/common/base/Function
    at org.springframework.beans.factory.support.SimpleInstantiationStrategy.instantiate(SimpleInstantiationStrategy.java:189) ~[spring-beans-4.3.10.RELEASE.jar:4.3.10.RELEASE]
    at org.springframework.beans.factory.support.ConstructorResolver.instantiateUsingFactoryMethod(ConstructorResolver.java:588) ~[spring-beans-4.3.10.RELEASE.jar:4.3.10.RELEASE]
    ... 69 common frames omitted
Caused by: java.lang.NoClassDefFoundError: com/google/common/base/Function
    at com.netflix.discovery.DiscoveryClient.<init>(DiscoveryClient.java:128) ~[eureka-client-1.6.2.jar:1.6.2]
    at com.netflix.discovery.DiscoveryClient.<init>(DiscoveryClient.java:266) ~[eureka-client-1.6.2.jar:1.6.2]
    at com.netflix.discovery.DiscoveryClient.<init>(DiscoveryClient.java:262) ~[eureka-client-1.6.2.jar:1.6.2]
    at org.springframework.cloud.netflix.eureka.CloudEurekaClient.<init>(CloudEurekaClient.java:60) ~[spring-cloud-netflix-eureka-client-1.3.2.RELEASE.jar:1.3.2.RELEASE]
    at org.springframework.cloud.netflix.eureka.EurekaClientAutoConfiguration$RefreshableEurekaClientConfiguration.eurekaClient(EurekaClientAutoConfiguration.java:228) ~[spring-cloud-netflix-eureka-client-1.3.2.RELEASE.jar:1.3.2.RELEASE]
    at org.springframework.cloud.netflix.eureka.EurekaClientAutoConfiguration$RefreshableEurekaClientConfiguration$$EnhancerBySpringCGLIB$$b153fbca.CGLIB$eurekaClient$1(<generated>) ~[spring-cloud-netflix-eureka-client-1.3.2.RELEASE.jar:1.3.2.RELEASE]
    at org.springframework.cloud.netflix.eureka.EurekaClientAutoConfiguration$RefreshableEurekaClientConfiguration$$EnhancerBySpringCGLIB$$b153fbca$$FastClassBySpringCGLIB$$cc5140c9.invoke(<generated>) ~[spring-cloud-netflix-eureka-client-1.3.2.RELEASE.jar:1.3.2.RELEASE]
    at org.springframework.cglib.proxy.MethodProxy.invokeSuper(MethodProxy.java:228) ~[spring-core-4.3.10.RELEASE.jar:4.3.10.RELEASE]
    at org.springframework.context.annotation.ConfigurationClassEnhancer$BeanMethodInterceptor.intercept(ConfigurationClassEnhancer.java:358) ~[spring-context-4.3.10.RELEASE.jar:4.3.10.RELEASE]
    at org.springframework.cloud.netflix.eureka.EurekaClientAutoConfiguration$RefreshableEurekaClientConfiguration$$EnhancerBySpringCGLIB$$b153fbca.eurekaClient(<generated>) ~[spring-cloud-netflix-eureka-client-1.3.2.RELEASE.jar:1.3.2.RELEASE]
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[na:1.8.0_131]
    at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source) ~[na:1.8.0_131]
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source) ~[na:1.8.0_131]
    at java.lang.reflect.Method.invoke(Unknown Source) ~[na:1.8.0_131]
    at org.springframework.beans.factory.support.SimpleInstantiationStrategy.instantiate(SimpleInstantiationStrategy.java:162) ~[spring-beans-4.3.10.RELEASE.jar:4.3.10.RELEASE]
    ... 70 common frames omitted
Caused by: java.lang.ClassNotFoundException: com.google.common.base.Function
    at java.net.URLClassLoader.findClass(Unknown Source) ~[na:1.8.0_131]
    at java.lang.ClassLoader.loadClass(Unknown Source) ~[na:1.8.0_131]
    at sun.misc.Launcher$AppClassLoader.loadClass(Unknown Source) ~[na:1.8.0_131]
    at java.lang.ClassLoader.loadClass(Unknown Source) ~[na:1.8.0_131]
    ... 85 common frames omitted

为解决如上问题，在pom中依次引入了如下几个依赖。

        <dependency>
            <groupId>com.google.guava</groupId>
            <artifactId>guava</artifactId>
        </dependency>
        <dependency>
          <groupId>com.diffplug.guava</groupId>
          <artifactId>guava-cache</artifactId>
          <version>19.0.0</version>
        </dependency>

目前不知道有没有更合理的解决方法。

参考资料

springcloud(第三篇)springcloud eureka 服务注册与发现
Spring Cloud Netflix Service Discovery - Dalston.SR1

# spring # eureka # 微服务
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