修改SpringBoot的配置文件application.yaml后启动失败

经常碰到修改application.yaml文件之后，SpringBoot项目启动失败的，报错信息如下

Connected to the target VM, address: '127.0.0.1:7105', transport: 'socket'
21:12:59.122 [main] DEBUG org.springframework.boot.context.logging.ClasspathLoggingApplicationListener - Application failed to start with classpath: unknown
21:12:59.125 [main] ERROR org.springframework.boot.SpringApplication - Application run failed
java.lang.IllegalStateException: Failed to load property source from 'file:/G:/Program/JAVA_WorkSpace/project1/Cloud/redis-demo/target/classes/application.yaml' (classpath:/application.yaml)at org.springframework.boot.context.config.ConfigFileApplicationListener$Loader.load(ConfigFileApplicationListener.java:564)at org.springframework.boot.context.config.ConfigFileApplicationListener$Loader.loadForFileExtension(ConfigFileApplicationListener.java:501)at org.springframework.boot.context.config.ConfigFileApplicationListener$Loader.load(ConfigFileApplicationListener.java:471)at org.springframework.boot.context.config.ConfigFileApplicationListener$Loader.lambda$null$7(ConfigFileApplicationListener.java:450)at java.base/java.lang.Iterable.forEach(Iterable.java:75)at org.springframework.boot.context.config.ConfigFileApplicationListener$Loader.lambda$load$8(ConfigFileApplicationListener.java:450)at java.base/java.lang.Iterable.forEach(Iterable.java:75)at org.springframework.boot.context.config.ConfigFileApplicationListener$Loader.load(ConfigFileApplicationListener.java:447)at org.springframework.boot.context.config.ConfigFileApplicationListener$Loader.lambda$load$0(ConfigFileApplicationListener.java:350)at org.springframework.boot.context.config.FilteredPropertySource.apply(FilteredPropertySource.java:54)at org.springframework.boot.context.config.ConfigFileApplicationListener$Loader.load(ConfigFileApplicationListener.java:338)at org.springframework.boot.context.config.ConfigFileApplicationListener.addPropertySources(ConfigFileApplicationListener.java:229)at org.springframework.boot.context.config.ConfigFileApplicationListener.postProcessEnvironment(ConfigFileApplicationListener.java:213)at org.springframework.boot.context.config.ConfigFileApplicationListener.onApplicationEnvironmentPreparedEvent(ConfigFileApplicationListener.java:203)at org.springframework.boot.context.config.ConfigFileApplicationListener.onApplicationEvent(ConfigFileApplicationListener.java:191)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:80)at org.springframework.boot.SpringApplicationRunListeners.environmentPrepared(SpringApplicationRunListeners.java:53)at org.springframework.boot.SpringApplication.prepareEnvironment(SpringApplication.java:345)at org.springframework.boot.SpringApplication.run(SpringApplication.java:308)at org.springframework.boot.SpringApplication.run(SpringApplication.java:1237)at org.springframework.boot.SpringApplication.run(SpringApplication.java:1226)at cn.itcast.redisdemo.RedisDemoApplication.main(RedisDemoApplication.java:14)
Caused by: org.yaml.snakeyaml.error.YAMLException: java.nio.charset.MalformedInputException: Input length = 2at org.yaml.snakeyaml.reader.StreamReader.update(StreamReader.java:218)at org.yaml.snakeyaml.reader.StreamReader.ensureEnoughData(StreamReader.java:176)at org.yaml.snakeyaml.reader.StreamReader.ensureEnoughData(StreamReader.java:171)at org.yaml.snakeyaml.reader.StreamReader.peek(StreamReader.java:126)at org.yaml.snakeyaml.scanner.ScannerImpl.scanToNextToken(ScannerImpl.java:1177)at org.yaml.snakeyaml.scanner.ScannerImpl.fetchMoreTokens(ScannerImpl.java:287)at org.yaml.snakeyaml.scanner.ScannerImpl.checkToken(ScannerImpl.java:227)at org.yaml.snakeyaml.parser.ParserImpl$ParseImplicitDocumentStart.produce(ParserImpl.java:195)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.checkNode(Composer.java:82)at org.yaml.snakeyaml.constructor.BaseConstructor.checkData(BaseConstructor.java:123)at org.yaml.snakeyaml.Yaml$1.hasNext(Yaml.java:489)at org.springframework.beans.factory.config.YamlProcessor.process(YamlProcessor.java:200)at org.springframework.beans.factory.config.YamlProcessor.process(YamlProcessor.java:164)at org.springframework.boot.env.OriginTrackedYamlLoader.load(OriginTrackedYamlLoader.java:82)at org.springframework.boot.env.YamlPropertySourceLoader.load(YamlPropertySourceLoader.java:50)at org.springframework.boot.context.config.ConfigFileApplicationListener$Loader.loadDocuments(ConfigFileApplicationListener.java:632)at org.springframework.boot.context.config.ConfigFileApplicationListener$Loader.load(ConfigFileApplicationListener.java:534)... 25 common frames omitted
Caused by: java.nio.charset.MalformedInputException: Input length = 2at java.base/java.nio.charset.CoderResult.throwException(CoderResult.java:274)at java.base/sun.nio.cs.StreamDecoder.implRead(StreamDecoder.java:326)at java.base/sun.nio.cs.StreamDecoder.read(StreamDecoder.java:188)at java.base/java.io.InputStreamReader.read(InputStreamReader.java:177)at org.yaml.snakeyaml.reader.UnicodeReader.read(UnicodeReader.java:125)at org.yaml.snakeyaml.reader.StreamReader.update(StreamReader.java:183)... 43 common frames omitted
Disconnected from the target VM, address: '127.0.0.1:7105', transport: 'socket'Process finished with exit code 1

从【java.lang.IllegalStateException: Failed to load property source from 'file:/G:/Program/JAVA_WorkSpace/project1/Cloud/redis-demo/target/classes/application.yaml'】可以看出来是配置文件的问题，这个问题一般是配置文件编码格式不对。一般都是改了配置，加了一些中文注释之类的导致项目无法启动。

解决方案：

方案1：

删除非英文部分的字符

方案2：

以IDEA为例，把圈起来的地方全都设置为UTF-8，然后重新启动。