解决：ERROR org.springframework.boot.SpringApplication - Application run failedorg.yaml.snakey

在启动项目的时候报下面错误导致服务启动失败，详细报错信息如下：

21:10:56.676 [main] ERROR org.springframework.boot.SpringApplication - Application run failed
org.yaml.snakeyaml.scanner.ScannerException: mapping values are not allowed here
 in 'reader', line 14, column 24:
          driver-class-name: com.mysql.cj.jdbc.Driver
                           ^

    at org.yaml.snakeyaml.scanner.ScannerImpl.fetchValue(ScannerImpl.java:890)
    at org.yaml.snakeyaml.scanner.ScannerImpl.fetchMoreTokens(ScannerImpl.java:379)
    at org.yaml.snakeyaml.scanner.ScannerImpl.checkToken(ScannerImpl.java:248)
    at org.yaml.snakeyaml.parser.ParserImpl$ParseBlockMappingKey.produce(ParserImpl.java:602)
    at org.yaml.snakeyaml.parser.ParserImpl.peekEvent(ParserImpl.java:165)
    at org.yaml.snakeyaml.comments.CommentEventsCollector$1.peek(CommentEventsCollector.java:59)
    at org.yaml.snakeyaml.comments.CommentEventsCollector$1.peek(CommentEventsCollector.java:45)
    at org.yaml.snakeyaml.comments.CommentEventsCollector.collectEvents(CommentEventsCollector.java:140)
    at org.yaml.snakeyaml.comments.CommentEventsCollector.collectEvents(CommentEventsCollector.java:119)
    at org.yaml.snakeyaml.composer.Composer.composeScalarNode(Composer.java:221)
    at org.yaml.snakeyaml.composer.Composer.composeNode(Composer.java:191)
    at org.yaml.snakeyaml.composer.Composer.composeValueNode(Composer.java:313)
    at org.yaml.snakeyaml.composer.Composer.composeMappingChildren(Composer.java:304)
    at org.yaml.snakeyaml.composer.Composer.composeMappingNode(Composer.java:288)
    at org.yaml.snakeyaml.composer.Composer.composeNode(Composer.java:195)
    at org.yaml.snakeyaml.composer.Composer.composeValueNode(Composer.java:313)
    at org.yaml.snakeyaml.composer.Composer.composeMappingChildren(Composer.java:304)
    at org.yaml.snakeyaml.composer.Composer.composeMappingNode(Composer.java:288)
    at org.yaml.snakeyaml.composer.Composer.composeNode(Composer.java:195)
    at org.yaml.snakeyaml.composer.Composer.composeValueNode(Composer.java:313)
    at org.yaml.snakeyaml.composer.Composer.composeMappingChildren(Composer.java:304)
    at org.yaml.snakeyaml.composer.Composer.composeMappingNode(Composer.java:288)
    at org.yaml.snakeyaml.composer.Composer.composeNode(Composer.java:195)
    at org.yaml.snakeyaml.composer.Composer.getNode(Composer.java:115)
    at org.yaml.snakeyaml.constructor.BaseConstructor.getData(BaseConstructor.java:135)
    at org.springframework.boot.env.OriginTrackedYamlLoader$OriginTrackingConstructor.getData(OriginTrackedYamlLoader.java:99)
    at org.yaml.snakeyaml.Yaml$1.next(Yaml.java:512)
    at org.springframework.beans.factory.config.YamlProcessor.process(YamlProcessor.java:198)
    at org.springframework.beans.factory.config.YamlProcessor.process(YamlProcessor.java:166)
    at org.springframework.boot.env.OriginTrackedYamlLoader.load(OriginTrackedYamlLoader.java:84)
    at org.springframework.boot.env.YamlPropertySourceLoader.load(YamlPropertySourceLoader.java:50)
    at org.springframework.boot.context.config.StandardConfigDataLoader.load(StandardConfigDataLoader.java:54)
    at org.springframework.boot.context.config.StandardConfigDataLoader.load(StandardConfigDataLoader.java:36)
    at org.springframework.boot.context.config.ConfigDataLoaders.load(ConfigDataLoaders.java:107)
    at org.springframework.boot.context.config.ConfigDataImporter.load(ConfigDataImporter.java:128)
    at org.springframework.boot.context.config.ConfigDataImporter.resolveAndLoad(ConfigDataImporter.java:86)
    at org.springframework.boot.context.config.ConfigDataEnvironmentContributors.withProcessedImports(ConfigDataEnvironmentContributors.java:121)
    at org.springframework.boot.context.config.ConfigDataEnvironment.processInitial(ConfigDataEnvironment.java:240)
    at org.springframework.boot.context.config.ConfigDataEnvironment.processAndApply(ConfigDataEnvironment.java:227)
    at org.springframework.boot.context.config.ConfigDataEnvironmentPostProcessor.postProcessEnvironment(ConfigDataEnvironmentPostProcessor.java:102)
    at org.springframework.boot.context.config.ConfigDataEnvironmentPostProcessor.postProcessEnvironment(ConfigDataEnvironmentPostProcessor.java:94)
    at org.springframework.boot.env.EnvironmentPostProcessorApplicationListener.onApplicationEnvironmentPreparedEvent(EnvironmentPostProcessorApplicationListener.java:102)
    at org.springframework.boot.env.EnvironmentPostProcessorApplicationListener.onApplicationEvent(EnvironmentPostProcessorApplicationListener.java:87)
    at org.springframework.context.event.SimpleApplicationEventMulticaster.doInvokeListener(SimpleApplicationEventMulticaster.java:176)
    at org.springframework.context.event.SimpleApplicationEventMulticaster.invokeListener(SimpleApplicationEventMulticaster.java:169)
    at org.springframework.context.event.SimpleApplicationEventMulticaster.multicastEvent(SimpleApplicationEventMulticaster.java:143)
    at org.springframework.context.event.SimpleApplicationEventMulticaster.multicastEvent(SimpleApplicationEventMulticaster.java:131)
    at org.springframework.boot.context.event.EventPublishingRunListener.environmentPrepared(EventPublishingRunListener.java:82)
    at org.springframework.boot.SpringApplicationRunListeners.lambda$environmentPrepared$2(SpringApplicationRunListeners.java:63)
    at java.util.ArrayList.forEach(ArrayList.java:1255)
    at org.springframework.boot.SpringApplicationRunListeners.doWithListeners(SpringApplicationRunListeners.java:117)
    at org.springframework.boot.SpringApplicationRunListeners.doWithListeners(SpringApplicationRunListeners.java:111)
    at org.springframework.boot.SpringApplicationRunListeners.environmentPrepared(SpringApplicationRunListeners.java:62)
    at org.springframework.boot.SpringApplication.prepareEnvironment(SpringApplication.java:374)
    at org.springframework.boot.SpringApplication.run(SpringApplication.java:332)
    at org.springframework.boot.SpringApplication.run(SpringApplication.java:1354)
    at org.springframework.boot.SpringApplication.run(SpringApplication.java:1343)
    at com.lxl.RedisDemoApplication.main(RedisDemoApplication.java:9)

Process finished with exit code 1

报错部分截图如下：

经过仔细思考，发现是因为driver-class-name前面不知道什么时候多输了一个空格导致的，删掉多余的空格，服务启动成功，所以在开发的时候，一定要注意yml文件的格式