在Springboot启动项目的时候，出现如下错误

java.lang.IllegalStateException: The following classes could not be excluded because they are not auto-configuration classes:
- org.springframework.boot.autoconfigure.jdbc.DataSourceProperties

at org.springframework.boot.autoconfigure.AutoConfigurationImportSelector.handleInvalidExcludes(AutoConfigurationImportSelector.java:209) ~[spring-boot-autoconfigure-2.1.7.RELEASE.jar:2.1.7.RELEASE]
at org.springframework.boot.autoconfigure.AutoConfigurationImportSelector.checkExcludedClasses(AutoConfigurationImportSelector.java:195) ~[spring-boot-autoconfigure-2.1.7.RELEASE.jar:2.1.7.RELEASE]
at org.springframework.boot.autoconfigure.AutoConfigurationImportSelector.getAutoConfigurationEntry(AutoConfigurationImportSelector.java:119) ~[spring-boot-autoconfigure-2.1.7.RELEASE.jar:2.1.7.RELEASE]
at org.springframework.boot.autoconfigure.AutoConfigurationImportSelector$AutoConfigurationGroup.process(AutoConfigurationImportSelector.java:396) ~[spring-boot-autoconfigure-2.1.7.RELEASE.jar:2.1.7.RELEASE]
at org.springframework.context.annotation.ConfigurationClassParser$DeferredImportSelectorGrouping.getImports(ConfigurationClassParser.java:875) ~[spring-context-5.1.9.RELEASE.jar:5.1.9.RELEASE]
at org.springframework.context.annotation.ConfigurationClassParser$DeferredImportSelectorGroupingHandler.processGroupImports(ConfigurationClassParser.java:801) ~[spring-context-5.1.9.RELEASE.jar:5.1.9.RELEASE]
at org.springframework.context.annotation.ConfigurationClassParser$DeferredImportSelectorHandler.process(ConfigurationClassParser.java:771) ~[spring-context-5.1.9.RELEASE.jar:5.1.9.RELEASE]
at org.springframework.context.annotation.ConfigurationClassParser.parse(ConfigurationClassParser.java:185) ~[spring-context-5.1.9.RELEASE.jar:5.1.9.RELEASE]
at org.springframework.context.annotation.ConfigurationClassPostProcessor.processConfigBeanDefinitions(ConfigurationClassPostProcessor.java:315) ~[spring-context-5.1.9.RELEASE.jar:5.1.9.RELEASE]
at org.springframework.context.annotation.ConfigurationClassPostProcessor.postProcessBeanDefinitionRegistry(ConfigurationClassPostProcessor.java:232) ~[spring-context-5.1.9.RELEASE.jar:5.1.9.RELEASE]
at org.springframework.context.support.PostProcessorRegistrationDelegate.invokeBeanDefinitionRegistryPostProcessors(PostProcessorRegistrationDelegate.java:275) ~[spring-context-5.1.9.RELEASE.jar:5.1.9.RELEASE]
at org.springframework.context.support.PostProcessorRegistrationDelegate.invokeBeanFactoryPostProcessors(PostProcessorRegistrationDelegate.java:95) ~[spring-context-5.1.9.RELEASE.jar:5.1.9.RELEASE]
    ...

这句话的意思是“不能排序以下类，因为它不是自动配置类”

以下类：指的就是错误第二行的DataSourceProperties，所以检查代码发现

@SpringBootApplication(exclude = DataSourceProperties.class)
public class ServerApplication {

    public static void main(String[] args) {
        SpringApplication.run(ServerApplication.class, args);
    }

}

这个里面exclude只能排除auto-configuration类型的类，而DataSourceProperties.class 并不是，所以不能排除在这

代码写错了，应该是要排除DataSourceAutoConfiguration.class,用来排除不进行数据库连接设置