启动springboot项目时，出现了以下报错：
defaultPattern_IS_UNDEFINEDdefaultPattern_IS_UNDEFINEDdefaultPattern_IS_UNDEFINEDjava.lang.IllegalStateException: Failed to load property source from location 'classpath:/application-local.yaml'
at org.springframework.boot.context.config.ConfigFileApplicationListener$Loader.load(ConfigFileApplicationListener.java:526)
at org.springframework.boot.context.config.ConfigFileApplicationListener$Loader.loadForFileExtension(ConfigFileApplicationListener.java:464)
at org.springframework.boot.context.config.ConfigFileApplicationListener$Loader.load(ConfigFileApplicationListener.java:445)
at org.springframework.boot.context.config.ConfigFileApplicationListener$Loader.lambda$null$6(ConfigFileApplicationListener.java:427)
at java.lang.Iterable.forEach(Iterable.java:75)
at org.springframework.boot.context.config.ConfigFileApplicationListener$Loader.lambda$load$7(ConfigFileApplicationListener.java:427)
at java.lang.Iterable.forEach(Iterable.java:75)
at org.springframework.boot.context.config.ConfigFileApplicationListener$Loader.load(ConfigFileApplicationListener.java:424)
at org.springframework.boot.context.config.ConfigFileApplicationListener$Loader.load(ConfigFileApplicationListener.java:323)
at org.springframework.boot.context.config.ConfigFileApplicationListener.addPropertySources(ConfigFileApplicationListener.java:204)
at org.springframework.boot.context.config.ConfigFileApplicationListener.postProcessEnvironment(ConfigFileApplicationListener.java:188)
at org.springframework.boot.context.config.ConfigFileApplicationListener.onApplicationEnvironmentPreparedEvent(ConfigFileApplicationListener.java:178)
at org.springframework.boot.context.config.ConfigFileApplicationListener.onApplicationEvent(ConfigFileApplicationListener.java:166)
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:76)
at org.springframework.boot.SpringApplicationRunListeners.environmentPrepared(SpringApplicationRunListeners.java:53)
at org.springframework.boot.SpringApplication.prepareEnvironment(SpringApplication.java:342)
at org.springframework.boot.SpringApplication.run(SpringApplication.java:305)
at org.springframework.boot.SpringApplication.run(SpringApplication.java:1215)
at org.springframework.boot.SpringApplication.run(SpringApplication.java:1204)
at cn.gov.chinatax.gt4.wxtjr.WxtjrServiceWebApplication.main(WxtjrServiceWebApplication.java:35)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:498)
at com.intellij.rt.execution.CommandLineWrapper.main(CommandLineWrapper.java:64)
Caused by: org.yaml.snakeyaml.error.YAMLException: java.nio.charset.MalformedInputException: Input length = 2
at 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:72)
at org.yaml.snakeyaml.constructor.BaseConstructor.checkData(BaseConstructor.java:112)
at org.yaml.snakeyaml.Yaml$1.hasNext(Yaml.java:542)
at org.springframework.beans.factory.config.YamlProcessor.process(YamlProcessor.java:200)
at org.springframework.beans.factory.config.YamlProcessor.process(YamlProcessor.java:164)
at org.springframework.boot.env.OriginTrackedYamlLoader.load(OriginTrackedYamlLoader.java:76)
at org.springframework.boot.env.YamlPropertySourceLoader.load(YamlPropertySourceLoader.java:54)
at org.springframework.boot.context.config.ConfigFileApplicationListener$Loader.loadDocuments(ConfigFileApplicationListener.java:544)
at org.springframework.boot.context.config.ConfigFileApplicationListener$Loader.load(ConfigFileApplicationListener.java:499)
... 28 common frames omitted
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:125)
at org.yaml.snakeyaml.reader.StreamReader.update(StreamReader.java:183)
... 46 common frames omitted
Process finished with exit code 1
本地好几个项目启动都是突然报了以上的错误，
出现这个的原因，就是解析yml文件时，中文字符集不是utf-8的原因或者有的项目就是GBK形式的，改成UTF-8反而还是会报错，改成GBK不报错，也有可能。
以下是我个人自己尝试了总结的解决方法
解决办法
一、检查pom文件
我们首先需要在pom文件中设置，编译时编码utf-8即可。
<properties>
<java.version>1.8</java.version>
<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
<project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
<maven.compiler.encoding>UTF-8</maven.compiler.encoding>
</properties>
如果以上还不行的话，那就按照接下来的方法试试
然后重新启动项目，就不会报错了。
如果你的项目pom本身并没有指定UTF-8,那么你的yaml改为UTF-8,可以再次启动，也可能启动不了，然后yaml改为GBK重启成功也是可能的。所以最好还是pom指定好文件格式。
如果你的项目本地启动报错java.nio.charset.MalformedInputException: Input length =2，
pom本身并没有指定UTF-8,那么说明你的项目有两个地方需要更改格式，记住这里说的是本地项目启动。要么这两个地方改为GBK,要么就是UTF-8
二、修改application.yml文件
application.yml文件本身有问题，直接改文件后缀名的话可能导致文件有问题。
因此需要把application.yml文件备份，重新在resources下新建一个yaml文件，命名为application.yml，将备份文件的内容拷贝进去。