java.lang.IllegalStateException: Failed to load property source from location 'classpath:/application.yaml'

    at org.springframework.boot.context.config.ConfigFileApplicationListener$Loader.load(ConfigFileApplicationListener.java:537)

    at org.springframework.boot.context.config.ConfigFileApplicationListener$Loader.loadForFileExtension(ConfigFileApplicationListener.java:496)

    at org.springframework.boot.context.config.ConfigFileApplicationListener$Loader.load(ConfigFileApplicationListener.java:464)

    at org.springframework.boot.context.config.ConfigFileApplicationListener$Loader.lambda$null$6(ConfigFileApplicationListener.java:446)

    at java.lang.Iterable.forEach(Iterable.java:75)

    at org.springframework.boot.context.config.ConfigFileApplicationListener$Loader.lambda$load$7(ConfigFileApplicationListener.java:445)

    at java.lang.Iterable.forEach(Iterable.java:75)

    at org.springframework.boot.context.config.ConfigFileApplicationListener$Loader.load(ConfigFileApplicationListener.java:442)

    at org.springframework.boot.context.config.ConfigFileApplicationListener$Loader.load(ConfigFileApplicationListener.java:330)

    at org.springframework.boot.context.config.ConfigFileApplicationListener.addPropertySources(ConfigFileApplicationListener.java:212)

    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:127)

    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:358)

    at org.springframework.boot.SpringApplication.run(SpringApplication.java:317)

    at org.springframework.boot.SpringApplication.run(SpringApplication.java:1255)

    at org.springframework.boot.SpringApplication.run(SpringApplication.java:1243)

    at com.qingmu.MySpringBootSstart.main(MySpringBootSstart.java:16)

Caused by: java.lang.IllegalStateException: duplicate key: datasource

    at org.yaml.snakeyaml.constructor.SafeConstructor.processDuplicateKeys(SafeConstructor.java:99)

    at org.yaml.snakeyaml.constructor.SafeConstructor.flattenMapping(SafeConstructor.java:70)

    at org.yaml.snakeyaml.constructor.SafeConstructor.constructMapping2ndStep(SafeConstructor.java:182)

    at org.yaml.snakeyaml.constructor.BaseConstructor.constructMapping(BaseConstructor.java:443)

    at org.yaml.snakeyaml.constructor.SafeConstructor$ConstructYamlMap.construct(SafeConstructor.java:519)

    at org.yaml.snakeyaml.constructor.BaseConstructor.constructObjectNoCheck(BaseConstructor.java:207)

    at org.yaml.snakeyaml.constructor.BaseConstructor.constructObject(BaseConstructor.java:196)

    at org.springframework.boot.env.OriginTrackedYamlLoader$OriginTrackingConstructor.constructObject(OriginTrackedYamlLoader.java:94)

    at org.yaml.snakeyaml.constructor.BaseConstructor.constructMapping2ndStep(BaseConstructor.java:462)

    at org.yaml.snakeyaml.constructor.SafeConstructor.constructMapping2ndStep(SafeConstructor.java:183)

    at org.yaml.snakeyaml.constructor.BaseConstructor.constructMapping(BaseConstructor.java:443)

    at org.yaml.snakeyaml.constructor.SafeConstructor$ConstructYamlMap.construct(SafeConstructor.java:519)

    at org.yaml.snakeyaml.constructor.BaseConstructor.constructObjectNoCheck(BaseConstructor.java:207)

    at org.yaml.snakeyaml.constructor.BaseConstructor.constructObject(BaseConstructor.java:196)

    at org.springframework.boot.env.OriginTrackedYamlLoader$OriginTrackingConstructor.constructObject(OriginTrackedYamlLoader.java:94)

    at org.yaml.snakeyaml.constructor.BaseConstructor.constructDocument(BaseConstructor.java:161)

    at org.yaml.snakeyaml.constructor.BaseConstructor.getData(BaseConstructor.java:127)

    at org.yaml.snakeyaml.Yaml$1.next(Yaml.java:547)

    at org.springframework.beans.factory.config.YamlProcessor.process(YamlProcessor.java:168)

    at org.springframework.beans.factory.config.YamlProcessor.process(YamlProcessor.java:141)

    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:547)

    at org.springframework.boot.context.config.ConfigFileApplicationListener$Loader.load(ConfigFileApplicationListener.java:517)

    ... 23 common frames omitted

因为我在使用的是yaml文件模式,然后因为:

去掉三个相同的键以后,就能够正常运行了.

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