Description of the problem: IDEAL in the program compilation, packaging are whole into, debug on the error, the content is as follows:

org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'org.springframework.cloud.netflix.eureka.EurekaDiscoveryClientConfiguration$EurekaHealthCheckHandlerConfiguration': Instantiation of bean failed; nested exception is org.springframework.beans.BeanInstantiationException: Failed to instantiate [org.springframework.cloud.netflix.eureka.EurekaDiscoveryClientConfiguration$EurekaHealthCheckHandlerConfiguration]: Constructor threw exception; nested exception is java.lang.NoClassDefFoundError: org/springframework/boot/actuate/health/SimpleStatusAggregator
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.instantiateBean(AbstractAutowireCapableBeanFactory.java:1334) ~[spring-beans-5.3.13.jar:5.3.13]
 
     ......
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.instantiateBean(AbstractAutowireCapableBeanFactory.java:1326) ~[spring-beans-5.3.13.jar:5.3.13]
    ... 17 common frames omitted
Caused by: java.lang.NoClassDefFoundError: org/springframework/boot/actuate/health/SimpleStatusAggregator
    at org.springframework.cloud.netflix.eureka.EurekaDiscoveryClientConfiguration$EurekaHealthCheckHandlerConfiguration.<init>(EurekaDiscoveryClientConfiguration.java:64) ~[spring-cloud-netflix-eureka-client-3.1.0.jar:3.1.0]
    at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method) ~[na:1.8.0_251]
    at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:62) ~[na:1.8.0_251]
    at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45) ~[na:1.8.0_251]
    at java.lang.reflect.Constructor.newInstance(Constructor.java:423) ~[na:1.8.0_251]
    at org.springframework.beans.BeanUtils.instantiateClass(BeanUtils.java:211) ~[spring-beans-5.3.13.jar:5.3.13]
    ... 19 common frames omitted
Caused by: java.lang.ClassNotFoundException: org.springframework.boot.actuate.health.SimpleStatusAggregator
    at java.net.URLClassLoader.findClass(URLClassLoader.java:382) ~[na:1.8.0_251]
    at java.lang.ClassLoader.loadClass(ClassLoader.java:418) ~[na:1.8.0_251]
    at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:355) ~[na:1.8.0_251]
    at java.lang.ClassLoader.loadClass(ClassLoader.java:351) ~[na:1.8.0_251]
    ... 25 common frames omitted

 

Error Analysis:
Add eureka.client.healthcheck.enabled=true in application.properties files

Solution:
1. add dependency in pom.xml

 <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-actuator</artifactId>
</dependency>

 

2. file->invalidate caches/restart