如何解决Spring Boot v2.1.3.RELEASE 的 while scanning an alias的问题

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初学 Spring Boot 框架，在搭建"优雅停服"的时候遇到问题，怎么也配置不通，有一系列问题（都是我自己的原因，太菜）。下面简单说一下，首先，我是用的 application.yml 配置文件进行配置的。这个就导致了配置以下

management.endpoints.web.exposure.include: *

再启动项目，会出现报错：

09:56:06.571 [main] ERROR org.springframework.boot.SpringApplication - Application run failedjava.lang.IllegalStateException: Failed to load property source from location 'classpath:/application.yml'        at org.springframework.boot.context.config.ConfigFileApplicationListener$Loader.load(ConfigFileApplicationListener.java:554)        at org.springframework.boot.context.config.ConfigFileApplicationListener$Loader.loadForFileExtension(ConfigFileApplicationListener.java:500)        at org.springframework.boot.context.config.ConfigFileApplicationListener$Loader.load(ConfigFileApplicationListener.java:467)        at org.springframework.boot.context.config.ConfigFileApplicationListener$Loader.lambda$null$6(ConfigFileApplicationListener.java:448)        at java.lang.Iterable.forEach(Iterable.java:75)        at org.springframework.boot.context.config.ConfigFileApplicationListener$Loader.lambda$load$7(ConfigFileApplicationListener.java:447)        at java.lang.Iterable.forEach(Iterable.java:75)        at org.springframework.boot.context.config.ConfigFileApplicationListener$Loader.load(ConfigFileApplicationListener.java:444)        at org.springframework.boot.context.config.ConfigFileApplicationListener$Loader.load(ConfigFileApplicationListener.java:332)        at org.springframework.boot.context.config.ConfigFileApplicationListener.addPropertySources(ConfigFileApplicationListener.java:207)        at org.springframework.boot.context.config.ConfigFileApplicationListener.postProcessEnvironment(ConfigFileApplicationListener.java:190)        at org.springframework.boot.context.config.ConfigFileApplicationListener.onApplicationEnvironmentPreparedEvent(ConfigFileApplicationListener.java:177)        at org.springframework.boot.context.config.ConfigFileApplicationListener.onApplicationEvent(ConfigFileApplicationListener.java:163)        at org.springframework.context.event.SimpleApplicationEventMulticaster.doInvokeListener(SimpleApplicationEventMulticaster.java:172)        at org.springframework.context.event.SimpleApplicationEventMulticaster.invokeListener(SimpleApplicationEventMulticaster.java:165)        at org.springframework.context.event.SimpleApplicationEventMulticaster.multicastEvent(SimpleApplicationEventMulticaster.java:139)        at org.springframework.context.event.SimpleApplicationEventMulticaster.multicastEvent(SimpleApplicationEventMulticaster.java:127)        at org.springframework.boot.context.event.EventPublishingRunListener.environmentPrepared(EventPublishingRunListener.java:75)        at org.springframework.boot.SpringApplicationRunListeners.environmentPrepared(SpringApplicationRunListeners.java:54)        at org.springframework.boot.SpringApplication.prepareEnvironment(SpringApplication.java:347)        at org.springframework.boot.SpringApplication.run(SpringApplication.java:306)        at org.springframework.boot.SpringApplication.run(SpringApplication.java:1260)        at org.springframework.boot.SpringApplication.run(SpringApplication.java:1248)        at com.eric.diary.DiaryApplication.main(DiaryApplication.java:12)Caused by: org.yaml.snakeyaml.scanner.ScannerException: while scanning an alias in 'reader', line 25, column 44:     ... endpoints.web.exposure.include: *                                         ^(13) in 'reader', line 25, column 45:     ... ndpoints.web.exposure.include: *                                         ^        at org.yaml.snakeyaml.scanner.ScannerImpl.scanAnchor(ScannerImpl.java:1444)        at org.yaml.snakeyaml.scanner.ScannerImpl.fetchAlias(ScannerImpl.java:916)        at org.yaml.snakeyaml.scanner.ScannerImpl.fetchMoreTokens(ScannerImpl.java:364)        at org.yaml.snakeyaml.scanner.ScannerImpl.checkToken(ScannerImpl.java:227)        at org.yaml.snakeyaml.parser.ParserImpl$ParseBlockMappingValue.produce(ParserImpl.java:586)        at org.yaml.snakeyaml.parser.ParserImpl.peekEvent(ParserImpl.java:158)        at org.yaml.snakeyaml.parser.ParserImpl.checkEvent(ParserImpl.java:148)        at org.yaml.snakeyaml.composer.Composer.composeNode(Composer.java:124)        at org.yaml.snakeyaml.composer.Composer.composeValueNode(Composer.java:236)        at org.yaml.snakeyaml.composer.Composer.composeMappingChildren(Composer.java:227)        at org.yaml.snakeyaml.composer.Composer.composeMappingNode(Composer.java:215)        at org.yaml.snakeyaml.composer.Composer.composeNode(Composer.java:144)        at org.yaml.snakeyaml.composer.Composer.getNode(Composer.java:85)        at org.yaml.snakeyaml.constructor.BaseConstructor.getData(BaseConstructor.java:123)        at org.yaml.snakeyaml.Yaml$1.next(Yaml.java:547)        at org.springframework.beans.factory.config.YamlProcessor.process(YamlProcessor.java:161)        at org.springframework.beans.factory.config.YamlProcessor.process(YamlProcessor.java:134)        at org.springframework.boot.env.OriginTrackedYamlLoader.load(OriginTrackedYamlLoader.java:75)        at org.springframework.boot.env.YamlPropertySourceLoader.load(YamlPropertySourceLoader.java:50)        at org.springframework.boot.context.config.ConfigFileApplicationListener$Loader.loadDocuments(ConfigFileApplicationListener.java:572)        at org.springframework.boot.context.config.ConfigFileApplicationListener$Loader.load(ConfigFileApplicationListener.java:526)        ... 23 common frames omittedDisconnected from the target VM, address: '127.0.0.1:59532', transport: 'socket'Process finished with exit code 1

查了一些资料，发现 yml 的配置文件的特殊符号要加上单引号，按如下配置就可以解决此问题：

management.endpoints.web.exposure.include: '*'

题外话：

配置"优雅停服"本来都快成功了，出现这个错误，一度以为自己又配错了，又重新配了，耽误了半天。其实 Spring Boot 配置的 1.x 和 2.x 配置不一样，然后 application.properties 和 application.yml 也有一点查别。下面放出 2.1.3 的 Spring Boot "优雅停服"的配置，也算是一个记录吧：

#/actuator转换成/eric（你也可以写任意的，默认是/actuator）management.endpoints.web.base-path: /eric#激活所有的端点的web方式请求（也可以单独只暴露shutdown断点，有些人管这个叫暴露）management.endpoints.web.exposure.include: '*'#启用shutdown（启用Spring Boot的shutdown功能）management.endpoint.shutdown.enabled: true

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