解决方法:
    在pom.xml中加入或者父pom.xml中加入
    <dependency>  
        <groupId>org.springframework.boot</groupId>  
        <artifactId>spring-boot-starter-web</artifactId>  
    </dependency>  
    即可

报错信息:

.   ____          _            __ _ _
 /\\ / ___'_ __ _ _(_)_ __  __ _ \ \ \ \
( ( )\___ | '_ | '_| | '_ \/ _` | \ \ \ \
 \\/  ___)| |_)| | | | | || (_| |  ) ) ) )
  '  |____| .__|_| |_|_| |_\__, | / / / /
 =========|_|==============|___/=/_/_/_/
 :: Spring Boot ::        (v2.1.6.RELEASE)

2019-07-03 14:17:49.002  INFO 67531 --- [           main] c.z.e.EurekaClientApplication            : No active profile set, falling back to default profiles: default
2019-07-03 14:17:49.438  INFO 67531 --- [           main] o.s.cloud.context.scope.GenericScope     : BeanFactory id=7ee7d973-fec7-384c-baa1-c7a4b4852bc5
2019-07-03 14:17:49.475  INFO 67531 --- [           main] trationDelegate$BeanPostProcessorChecker : Bean 'org.springframework.cloud.autoconfigure.ConfigurationPropertiesRebinderAutoConfiguration' of type [org.springframework.cloud.autoconfigure.ConfigurationPropertiesRebinderAutoConfiguration$$EnhancerBySpringCGLIB$$131bb016] is not eligible for getting processed by all BeanPostProcessors (for example: not eligible for auto-proxying)
2019-07-03 14:17:49.487  WARN 67531 --- [           main] c.n.c.sources.URLConfigurationSource     : No URLs will be polled as dynamic configuration sources.
2019-07-03 14:17:49.487  INFO 67531 --- [           main] c.n.c.sources.URLConfigurationSource     : To enable URLs as dynamic configuration sources, define System property archaius.configurationSource.additionalUrls or make config.properties available on classpath.
2019-07-03 14:17:49.490  WARN 67531 --- [           main] c.n.c.sources.URLConfigurationSource     : No URLs will be polled as dynamic configuration sources.
2019-07-03 14:17:49.490  INFO 67531 --- [           main] c.n.c.sources.URLConfigurationSource     : To enable URLs as dynamic configuration sources, define System property archaius.configurationSource.additionalUrls or make config.properties available on classpath.
2019-07-03 14:17:49.870  INFO 67531 --- [           main] o.s.c.n.eureka.InstanceInfoFactory       : Setting initial instance status as: STARTING
2019-07-03 14:17:49.900  INFO 67531 --- [           main] com.netflix.discovery.DiscoveryClient    : Initializing Eureka in region us-east-1
2019-07-03 14:17:50.164  INFO 67531 --- [           main] c.n.d.provider.DiscoveryJerseyProvider   : Using JSON encoding codec LegacyJacksonJson
2019-07-03 14:17:50.164  INFO 67531 --- [           main] c.n.d.provider.DiscoveryJerseyProvider   : Using JSON decoding codec LegacyJacksonJson
2019-07-03 14:17:50.251  INFO 67531 --- [           main] c.n.d.provider.DiscoveryJerseyProvider   : Using XML encoding codec XStreamXml
2019-07-03 14:17:50.252  INFO 67531 --- [           main] c.n.d.provider.DiscoveryJerseyProvider   : Using XML decoding codec XStreamXml
2019-07-03 14:17:50.399  INFO 67531 --- [           main] c.n.d.s.r.aws.ConfigClusterResolver      : Resolving eureka endpoints via configuration
2019-07-03 14:17:50.415  INFO 67531 --- [           main] com.netflix.discovery.DiscoveryClient    : Disable delta property : false
2019-07-03 14:17:50.415  INFO 67531 --- [           main] com.netflix.discovery.DiscoveryClient    : Single vip registry refresh property : null
2019-07-03 14:17:50.415  INFO 67531 --- [           main] com.netflix.discovery.DiscoveryClient    : Force full registry fetch : false
2019-07-03 14:17:50.415  INFO 67531 --- [           main] com.netflix.discovery.DiscoveryClient    : Application is null : false
2019-07-03 14:17:50.415  INFO 67531 --- [           main] com.netflix.discovery.DiscoveryClient    : Registered Applications size is zero : true
2019-07-03 14:17:50.415  INFO 67531 --- [           main] com.netflix.discovery.DiscoveryClient    : Application version is -1: true
2019-07-03 14:17:50.415  INFO 67531 --- [           main] com.netflix.discovery.DiscoveryClient    : Getting all instance registry info from the eureka server
2019-07-03 14:17:50.557  INFO 67531 --- [           main] com.netflix.discovery.DiscoveryClient    : The response status is 200
2019-07-03 14:17:50.560  INFO 67531 --- [           main] com.netflix.discovery.DiscoveryClient    : Starting heartbeat executor: renew interval is: 30
2019-07-03 14:17:50.563  INFO 67531 --- [           main] c.n.discovery.InstanceInfoReplicator     : InstanceInfoReplicator onDemand update allowed rate per min is 4
2019-07-03 14:17:50.566  INFO 67531 --- [           main] com.netflix.discovery.DiscoveryClient    : Discovery Client initialized at timestamp 1562134670565 with initial instances count: 1
2019-07-03 14:17:50.568  INFO 67531 --- [           main] o.s.c.n.e.s.EurekaServiceRegistry        : Registering application EUREKA-CLIENT with eureka with status UP
2019-07-03 14:17:50.568  INFO 67531 --- [           main] com.netflix.discovery.DiscoveryClient    : Saw local status change event StatusChangeEvent [timestamp=1562134670568, current=UP, previous=STARTING]
2019-07-03 14:17:50.569  INFO 67531 --- [nfoReplicator-0] com.netflix.discovery.DiscoveryClient    : DiscoveryClient_EUREKA-CLIENT/192.168.137.233:eureka-client:8869: registering service...
2019-07-03 14:17:50.580  INFO 67531 --- [           main] c.z.e.EurekaClientApplication            : Started EurekaClientApplication in 2.635 seconds (JVM running for 3.216)
2019-07-03 14:17:50.583  INFO 67531 --- [       Thread-9] o.s.c.n.e.s.EurekaServiceRegistry        : Unregistering application EUREKA-CLIENT with eureka with status DOWN
2019-07-03 14:17:50.583  WARN 67531 --- [       Thread-9] com.netflix.discovery.DiscoveryClient    : Saw local status change event StatusChangeEvent [timestamp=1562134670583, current=DOWN, previous=UP]
2019-07-03 14:17:50.586  INFO 67531 --- [       Thread-9] com.netflix.discovery.DiscoveryClient    : Shutting down DiscoveryClient ...
2019-07-03 14:17:50.597  INFO 67531 --- [nfoReplicator-0] com.netflix.discovery.DiscoveryClient    : DiscoveryClient_EUREKA-CLIENT/192.168.137.233:eureka-client:8869 - registration status: 204
2019-07-03 14:17:50.597  INFO 67531 --- [nfoReplicator-0] com.netflix.discovery.DiscoveryClient    : DiscoveryClient_EUREKA-CLIENT/192.168.137.233:eureka-client:8869: registering service...
2019-07-03 14:17:50.604  INFO 67531 --- [nfoReplicator-0] com.netflix.discovery.DiscoveryClient    : DiscoveryClient_EUREKA-CLIENT/192.168.137.233:eureka-client:8869 - registration status: 204
2019-07-03 14:17:50.605  INFO 67531 --- [       Thread-9] com.netflix.discovery.DiscoveryClient    : Unregistering ...
2019-07-03 14:17:50.611  INFO 67531 --- [       Thread-9] com.netflix.discovery.DiscoveryClient    : DiscoveryClient_EUREKA-CLIENT/192.168.137.233:eureka-client:8869 - deregister  status: 200
2019-07-03 14:17:50.627  INFO 67531 --- [       Thread-9] com.netflix.discovery.DiscoveryClient    : Completed shut down of DiscoveryClient

进程已结束,退出代码 0

解决思路:

看到"Unregistering application unknown with eureka with status DOWN",eureka无法注册未知应用程序,导致停止。感觉应该是缺少容器,spring-boot-starter-web中含有tomcat。

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