废话不多说，直接上错误堆栈：
Caused by: java.lang.IllegalStateException: Failed to load property source from location 'classpath:/application.yml' at org.springframework.boot.context.config.ConfigFileApplicationListener$Loader.loadIntoGroup(ConfigFileApplicationListener.java:476) at org.springframework.boot.context.config.ConfigFileApplicationListener$Loader.load(ConfigFileApplicationListener.java:465) at org.springframework.boot.context.config.ConfigFileApplicationListener$Loader.load(ConfigFileApplicationListener.java:386) at org.springframework.boot.context.config.ConfigFileApplicationListener.addPropertySources(ConfigFileApplicationListener.java:225) at org.springframework.boot.context.config.ConfigFileApplicationListener.postProcessEnvironment(ConfigFileApplicationListener.java:195) at org.springframework.boot.context.config.ConfigFileApplicationListener.onApplicationEnvironmentPreparedEvent(ConfigFileApplicationListener.java:182) at org.springframework.boot.context.config.ConfigFileApplicationListener.onApplicationEvent(ConfigFileApplicationListener.java:168) 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:122) at org.springframework.boot.context.event.EventPublishingRunListener.environmentPrepared(EventPublishingRunListener.java:74) at org.springframework.boot.SpringApplicationRunListeners.environmentPrepared(SpringApplicationRunListeners.java:54) at org.springframework.boot.SpringApplication.prepareEnvironment(SpringApplication.java:325) at org.springframework.boot.SpringApplication.run(SpringApplication.java:296) at org.springframework.boot.web.support.SpringBootServletInitializer.run(SpringBootServletInitializer.java:156) at org.springframework.boot.web.support.SpringBootServletInitializer.createRootApplicationContext(SpringBootServletInitializer.java:136) at org.springframework.boot.web.support.SpringBootServletInitializer.onStartup(SpringBootServletInitializer.java:91) at org.springframework.web.SpringServletContainerInitializer.onStartup(SpringServletContainerInitializer.java:169) at org.apache.catalina.core.StandardContext.startInternal(StandardContext.java:5245) at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:150) ... 42 more Caused by: org.yaml.snakeyaml.error.YAMLException: java.nio.charset.MalformedInputException: Input length = 1 at org.yaml.snakeyaml.reader.StreamReader.update(StreamReader.java:200) at org.yaml.snakeyaml.reader.StreamReader.forward(StreamReader.java:118) at org.yaml.snakeyaml.reader.StreamReader.forward(StreamReader.java:108) at org.yaml.snakeyaml.scanner.ScannerImpl.fetchValue(ScannerImpl.java:894) at org.yaml.snakeyaml.scanner.ScannerImpl.fetchMoreTokens(ScannerImpl.java:360) at org.yaml.snakeyaml.scanner.ScannerImpl.checkToken(ScannerImpl.java:226) at org.yaml.snakeyaml.parser.ParserImpl$ParseBlockMappingValue.produce(ParserImpl.java:585) at org.yaml.snakeyaml.parser.ParserImpl.peekEvent(ParserImpl.java:157) at org.yaml.snakeyaml.parser.ParserImpl.checkEvent(ParserImpl.java:147) at org.yaml.snakeyaml.composer.Composer.composeNode(Composer.java:132) at org.yaml.snakeyaml.composer.Composer.composeValueNode(Composer.java:246) at org.yaml.snakeyaml.composer.Composer.composeMappingChildren(Composer.java:237) at org.yaml.snakeyaml.composer.Composer.composeMappingNode(Composer.java:225) at org.yaml.snakeyaml.composer.Composer.composeNode(Composer.java:155) at org.yaml.snakeyaml.composer.Composer.composeDocument(Composer.java:122) at org.yaml.snakeyaml.composer.Composer.getNode(Composer.java:84) at org.yaml.snakeyaml.constructor.BaseConstructor.getData(BaseConstructor.java:104) at org.yaml.snakeyaml.Yaml$1.next(Yaml.java:471) at org.springframework.beans.factory.config.YamlProcessor.process(YamlProcessor.java:157) at org.springframework.beans.factory.config.YamlProcessor.process(YamlProcessor.java:135) at org.springframework.boot.env.YamlPropertySourceLoader$Processor.process(YamlPropertySourceLoader.java:101) at org.springframework.boot.env.YamlPropertySourceLoader.load(YamlPropertySourceLoader.java:58) at org.springframework.boot.env.PropertySourcesLoader.load(PropertySourcesLoader.java:128) at org.springframework.boot.context.config.ConfigFileApplicationListener$Loader.doLoadIntoGroup(ConfigFileApplicationListener.java:490) at org.springframework.boot.context.config.ConfigFileApplicationListener$Loader.loadIntoGroup(ConfigFileApplicationListener.java:473) ... 62 more Caused by: java.nio.charset.MalformedInputException: Input length = 1 at java.nio.charset.CoderResult.throwException(CoderResult.java:281) at sun.nio.cs.StreamDecoder.implRead(StreamDecoder.java:339) at sun.nio.cs.StreamDecoder.read(StreamDecoder.java:178) at java.io.InputStreamReader.read(InputStreamReader.java:184) at org.yaml.snakeyaml.reader.UnicodeReader.read(UnicodeReader.java:123) at java.io.Reader.read(Reader.java:140) at org.yaml.snakeyaml.reader.StreamReader.update(StreamReader.java:184) ... 86 more
解决办法：
通过一番折腾，发现自己的 yml 配置文件编码为 GBK，项目编码为 UTF-8。因此，将 yml 文件编码统一修改为 UTF-8 编码，问题解决了。
注意，这只是笔者项目的解决办法，因此并不能百分百解决你的问题，写出来仅仅提供一种参考，祝你好运！
