Eureka Client启动后就关闭 Unregistering application xxx with eureka with status DOWN

报错如下：

DiscoveryClient_USER-CENTER/192.168.1.231:user-center:2001: registering service...
Started UserCenterApplication in 2.351 seconds (JVM running for 2.892)
Unregistering application USER-CENTER with eureka with status DOWN
Saw local status change event StatusChangeEvent [timestamp=1583640516889, current=DOWN, previous=UP]
Shutting down DiscoveryClient ...
DiscoveryClient_USER-CENTER/192.168.1.231:user-center:2001 - registration status: 204
DiscoveryClient_USER-CENTER/192.168.1.231:user-center:2001: registering service...
DiscoveryClient_USER-CENTER/192.168.1.231:user-center:2001 - registration status: 204
Unregistering ...
DiscoveryClient_USER-CENTER/192.168.1.231:user-center:2001 - deregister  status: 200
Completed shut down of DiscoveryClient

springboot版本：2.2.0.RELEASE

springcloud版本：Hoxton.RELEASE

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解决：

在eureka-client中加入web包后解决

    org.springframework.boot
    spring-boot-starter-web

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可能原因：

1.不用web包只是一个java程序，所以运行后就停止了；

2.spring-boot-starter-web这个包里面存在tomcat，boot运行都需要这个包

以上猜测来自网络。