java.lang.ClassNotFoundException: com.netflix.discovery.DiscoveryClient$DiscoveryClientOptionalArgs

java.lang.ClassNotFoundException: com.netflix.discovery.DiscoveryClient$DiscoveryClientOptionalArgs

报错内容:

Caused by: java.lang.NoClassDefFoundError: com/netflix/discovery/DiscoveryClient$DiscoveryClientOptionalArgs
	at java.base/java.lang.ClassLoader.defineClass1(Native Method) ~[na:na]
	at java.base/java.lang.ClassLoader.defineClass(ClassLoader.java:1016) ~[na:na]
	at java.base/java.security.SecureClassLoader.defineClass(SecureClassLoader.java:151) ......
	at java.base/java.lang.ClassLoader.loadClass(ClassLoader.java:521) ~[na:na]
	at java.base/java.lang.Class.getDeclaredMethods0(Native Method) ~[na:na]
	at java.base/java.lang.Class.privateGetDeclaredMethods(Class.java:3171) ~[na:na]
	at java.base/java.lang.Class.getDeclaredMethods(Class.java:2314) ~[na:na]
	at org.springframework.util.ReflectionUtils.getDeclaredMethods(ReflectionUtils.java:463) ~[spring-core-5.2.2.RELEASE.jar:5.2.2.RELEASE]
	... 21 common frames omitted

报错截图:

报错原因以及解决方案:

我的原因很愚蠢, 引依赖不小心将Eureka-Client 引成了Eureka-Server,将依赖重新引入即可:

<!-- eureka客户端 -->
<dependency>
    <groupId>org.springframework.cloud</groupId>
    <artifactId>spring-cloud-starter-netflix-eureka-client</artifactId>
    <version>2.2.3.RELEASE</version>
</dependency>

注意, 不是

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

二者一个是用来做服务端(注册中心), 一个是用来做客户端(提供服务)