使用SpringBoot的yml文件配置时踩的一个坑

问题描述：使用SpringBoot整合redis进行yml配置的时候，启动工程报错，提示加载application.yml配置文件失败：

::27.430 [main] ERROR org.springframework.boot.SpringApplication - Application startup failed
java.lang.IllegalStateException: Failed to load property source from location 'classpath:/application.yml'
    at org.springframework.boot.context.config.ConfigFileApplicationListener$Loader.loadIntoGroup(ConfigFileApplicationListener.java:)
    at org.springframework.boot.context.config.ConfigFileApplicationListener$Loader.load(ConfigFileApplicationListener.java:)
    at org.springframework.boot.context.config.ConfigFileApplicationListener$Loader.load(ConfigFileApplicationListener.java:)
    at org.springframework.boot.context.config.ConfigFileApplicationListener.addPropertySources(ConfigFileApplicationListener.java:)
    at org.springframework.boot.context.config.ConfigFileApplicationListener.postProcessEnvironment(ConfigFileApplicationListener.java:)
    at org.springframework.boot.context.config.ConfigFileApplicationListener.onApplicationEnvironmentPreparedEvent(ConfigFileApplicationListener.java:)
    at org.springframework.boot.context.config.ConfigFileApplicationListener.onApplicationEvent(ConfigFileApplicationListener.java:)
    at org.springframework.context.event.SimpleApplicationEventMulticaster.invokeListener(SimpleApplicationEventMulticaster.java:)
    at org.springframework.context.event.SimpleApplicationEventMulticaster.multicastEvent(SimpleApplicationEventMulticaster.java:)
    at org.springframework.context.event.SimpleApplicationEventMulticaster.multicastEvent(SimpleApplicationEventMulticaster.java:)
    at org.springframework.boot.context.event.EventPublishingRunListener.environmentPrepared(EventPublishingRunListener.java:)
    at org.springframework.boot.SpringApplicationRunListeners.environmentPrepared(SpringApplicationRunListeners.java:)
    at org.springframework.boot.SpringApplication.prepareEnvironment(SpringApplication.java:)
    at org.springframework.boot.SpringApplication.run(SpringApplication.java:)
    at org.springframework.boot.SpringApplication.run(SpringApplication.java:)
    at org.springframework.boot.SpringApplication.run(SpringApplication.java:)
    at com.zhaopin.ImccApplication.main(ImccApplication.java:)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:)
    at java.lang.reflect.Method.invoke(Method.java:)
    at com.intellij.rt.execution.application.AppMain.main(AppMain.java:)
Caused by: org.yaml.snakeyaml.parser.ParserException: while parsing MappingNode
 in 'reader', line , column :
    server:
    ^
Duplicate key: spring
 in 'reader', line , column :

    ^

    at org.springframework.beans.factory.config.YamlProcessor$StrictMapAppenderConstructor.constructMapping(YamlProcessor.java:)
    at org.yaml.snakeyaml.constructor.SafeConstructor$ConstructYamlMap.construct(SafeConstructor.java:)
    at org.yaml.snakeyaml.constructor.BaseConstructor.constructObject(BaseConstructor.java:)
    at org.yaml.snakeyaml.constructor.BaseConstructor.constructDocument(BaseConstructor.java:)
    at org.yaml.snakeyaml.constructor.BaseConstructor.getData(BaseConstructor.java:)
    at org.yaml.snakeyaml.Yaml$.next(Yaml.java:)
    at org.springframework.beans.factory.config.YamlProcessor.process(YamlProcessor.java:)
    at org.springframework.beans.factory.config.YamlProcessor.process(YamlProcessor.java:)
    at org.springframework.boot.env.YamlPropertySourceLoader$Processor.process(YamlPropertySourceLoader.java:)
    at org.springframework.boot.env.YamlPropertySourceLoader.load(YamlPropertySourceLoader.java:)
    at org.springframework.boot.env.PropertySourcesLoader.load(PropertySourcesLoader.java:)
    at org.springframework.boot.context.config.ConfigFileApplicationListener$Loader.doLoadIntoGroup(ConfigFileApplicationListener.java:)
    at org.springframework.boot.context.config.ConfigFileApplicationListener$Loader.loadIntoGroup(ConfigFileApplicationListener.java:)
    ...  common frames omitted

Process finished with exit code 

application.yml配置截图：

注意图中有以spring开头的配置项，出现了两个spring，这是不符合yml配置语法的，所以启动报错。

解决方式：将yml配置文件修改为如下样子，再启动SpringBoot工程就不会报错了：

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