问题

java.lang.NoClassDefFoundError: com/mongodb/client/MongoDriverInformation
	at java.lang.Class.getDeclaredConstructors0(Native Method) ~[na:1.8.0_201]
	at java.lang.Class.privateGetDeclaredConstructors(Class.java:2671) ~[na:1.8.0_201]
	at java.lang.Class.getDeclaredConstructors(Class.java:2020) ~[na:1.8.0_201]
	at org.springframework.boot.context.properties.ConfigurationPropertiesBindConstructorProvider.findConstructorBindingAnnotatedConstructor(ConfigurationPropertiesBindConstructorProvider.java:62) ~[spring-boot-2.2.1.RELEASE.jar:2.2.1.RELEASE]
	at org.springframework.boot.context.properties.ConfigurationPropertiesBindConstructorProvider.getBindConstructor(ConfigurationPropertiesBindConstructorProvider.java:48) ~[spring-boot-2.2.1.RELEASE.jar:2.2.1.RELEASE]
	at org.springframework.boot.context.properties.ConfigurationPropertiesBean$BindMethod.forType(ConfigurationPropertiesBean.java:311) ~[spring-boot-2.2.1.RELEASE.jar:2.2.1.RELEASE]
	at org.springframework.boot.context.properties.ConfigurationPropertiesBeanDefinitionValidator.validate(ConfigurationPropertiesBeanDefinitionValidator.java:61) ~[spring-boot-2.2.1.RELEASE.jar:2.2.1.RELEASE]
	at org.springframework.boot.context.properties.ConfigurationPropertiesBeanDefinitionValidator.postProcessBeanFactory(ConfigurationPropertiesBeanDefinitionValidator.java:44) ~[spring-boot-2.2.1.RELEASE.jar:2.2.1.RELEASE]
	at org.springframework.context.support.PostProcessorRegistrationDelegate.invokeBeanFactoryPostProcessors(PostProcessorRegistrationDelegate.java:286) ~[spring-context-5.2.1.RELEASE.jar:5.2.1.RELEASE]
	at org.springframework.context.support.PostProcessorRegistrationDelegate.invokeBeanFactoryPostProcessors(PostProcessorRegistrationDelegate.java:174) ~[spring-context-5.2.1.RELEASE.jar:5.2.1.RELEASE]
	at org.springframework.context.support.AbstractApplicationContext.invokeBeanFactoryPostProcessors(AbstractApplicationContext.java:706) ~[spring-context-5.2.1.RELEASE.jar:5.2.1.RELEASE]
	at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:532) ~[spring-context-5.2.1.RELEASE.jar:5.2.1.RELEASE]
	at org.springframework.boot.web.servlet.context.ServletWebServerApplicationContext.refresh(ServletWebServerApplicationContext.java:141) ~[spring-boot-2.2.1.RELEASE.jar:2.2.1.RELEASE]
	at org.springframework.boot.SpringApplication.refresh(SpringApplication.java:747) [spring-boot-2.2.1.RELEASE.jar:2.2.1.RELEASE]
	at org.springframework.boot.SpringApplication.refreshContext(SpringApplication.java:397) [spring-boot-2.2.1.RELEASE.jar:2.2.1.RELEASE]
	at org.springframework.boot.SpringApplication.run(SpringApplication.java:315) [spring-boot-2.2.1.RELEASE.jar:2.2.1.RELEASE]
	at org.springframework.boot.SpringApplication.run(SpringApplication.java:1226) [spring-boot-2.2.1.RELEASE.jar:2.2.1.RELEASE]
	at org.springframework.boot.SpringApplication.run(SpringApplication.java:1215) [spring-boot-2.2.1.RELEASE.jar:2.2.1.RELEASE]
	at cn.sob.article.ArticleApp.main(ArticleApp.java:35) [classes/:na]
Caused by: java.lang.ClassNotFoundException: com.mongodb.client.MongoDriverInformation
	at java.net.URLClassLoader.findClass(URLClassLoader.java:382) ~[na:1.8.0_201]
	at java.lang.ClassLoader.loadClass(ClassLoader.java:424) ~[na:1.8.0_201]
	at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:349) ~[na:1.8.0_201]
	at java.lang.ClassLoader.loadClass(ClassLoader.java:357) ~[na:1.8.0_201]
	... 19 common frames omitted

遇到这样的问题我也不想的，哈哈。

解决过程

很明显，就是没有这个类嘛。

可是，这个类是有的

但是，这个类的包名不一样呀

查看了对应的库，根本就没有client目录

出现这种情况，通常是版本的问题

如果是的话，那就很简单了，我找一个运行正常的项目一看就知道了。

所以，就是这样子咯。

版本的问题

继续分析依赖，我明明添加的是3.6.3的，怎么就来了个3.11.2的呢？

可以看到spring-boot-starter-data-mongodb里面也有一个driver

那么这个问题就简单了，SpringCloud就是搞整合的，里面已经有mongodb的驱动了，不需要额外添加驱动依赖。

我删除即可。

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

只要这个就可以了，里面已经包含了驱动。