Disconnected from the target VM

前排提示：Disconnected from the target VM是一种常见的错误，导致这个错误可能是方方面面，请根据项目情况和日志进行分析，没有日志的项目建议构建日志。

Connected to the target VM, address: '127.0.0.1:3177', transport: 'socket'
Disconnected from the target VM, address: '127.0.0.1:3177', transport: 'socket'
Process finished with exit code 1

升级项目的jar包版本，从spring-boot-dependencies从2.1.6.RELEASE升级到2.7.0从而保证引用的spring核心jar包的版本升级从5.1.8.RELEASE升级到5.3.20，升级完成后项目无法启动

Caused by: java.lang.ClassNotFoundException: org.springframework.boot.context.properties.ConfigurationBeanFactoryMetadata
	at java.net.URLClassLoader.findClass(URLClassLoader.java:381) ~[?:1.8.0_181]
	at java.lang.ClassLoader.loadClass(ClassLoader.java:424) ~[?:1.8.0_181]
	at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:349) ~[?:1.8.0_181]
	at java.lang.ClassLoader.loadClass(ClassLoader.java:357) ~[?:1.8.0_181]
	at org.springframework.cloud.autoconfigure.ConfigurationPropertiesRebinderAutoConfiguration.configurationPropertiesBeans(ConfigurationPropertiesRebinderAutoConfiguration.java:56) ~[spring-cloud-context-2.1.2.RELEASE.jar:2.1.2.RELEASE]
	at org.springframework.cloud.autoconfigure.ConfigurationPropertiesRebinderAutoConfiguration$$EnhancerBySpringCGLIB$$b521b47.CGLIB$configurationPropertiesBeans$3() ~[spring-cloud-context-2.1.2.RELEASE.jar:2.1.2.RELEASE]
	at org.springframework.cloud.autoconfigure.ConfigurationPropertiesRebinderAutoConfiguration$$EnhancerBySpringCGLIB$$b521b47$$FastClassBySpringCGLIB$$f09598d2.invoke() ~[spring-cloud-context-2.1.2.RELEASE.jar:2.1.2.RELEASE]
	at org.springframework.cglib.proxy.MethodProxy.invokeSuper(MethodProxy.java:244) ~[spring-core-5.3.20.jar:5.3.20]
	at org.springframework.context.annotation.ConfigurationClassEnhancer$BeanMethodInterceptor.intercept(ConfigurationClassEnhancer.java:331) ~[spring-context-5.3.20.jar:5.3.20]
	at org.springframework.cloud.autoconfigure.ConfigurationPropertiesRebinderAutoConfiguration$$EnhancerBySpringCGLIB$$b521b47.configurationPropertiesBeans() ~[spring-cloud-context-2.1.2.RELEASE.jar:2.1.2.RELEASE]
	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[?:1.8.0_181]
	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) ~[?:1.8.0_181]
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[?:1.8.0_181]
	at java.lang.reflect.Method.invoke(Method.java:498) ~[?:1.8.0_181]
	at org.springframework.beans.factory.support.SimpleInstantiationStrategy.instantiate(SimpleInstantiationStrategy.java:154) ~[spring-beans-5.3.20.jar:5.3.20]
	at org.springframework.beans.factory.support.ConstructorResolver.instantiate(ConstructorResolver.java:653) ~[spring-beans-5.3.20.jar:5.3.20]
	... 32 more

根据项目报错搜索相关文章可知，springboot版本升级后，springcloud的版本没有升级，相应的类在不对应的版本中找不到，升级spring-cloud-dependencies到版本2021.0.0

    org.springframework.cloud
    spring-cloud-dependencies
    2021.0.0
    pom
    import