SpringBoot啟動yaml報錯的解決

更新時間：2021年08月18日 14:23:27 作者：草寶蟲

這篇文章主要介紹了SpringBoot啟動yaml報錯的解決方案，具有很好的參考價值，希望對大家有所幫助。如有錯誤或未考慮完全的地方，望不吝賜教

SpringBoot啟動yaml報錯

報錯找不到org.yaml里的一個方法

10:45:54.742 [main] ERROR org.springframework.boot.SpringApplication - Application run failed
java.lang.NoSuchMethodError: org.yaml.snakeyaml.nodes.ScalarNode.getScalarStyle()Lorg/yaml/snakeyaml/DumperOptions$ScalarStyle;
	at org.springframework.boot.env.OriginTrackedYamlLoader$KeyScalarNode.<init>(OriginTrackedYamlLoader.java:127)
	at org.springframework.boot.env.OriginTrackedYamlLoader$KeyScalarNode.get(OriginTrackedYamlLoader.java:138)
	at org.springframework.boot.env.OriginTrackedYamlLoader$KeyScalarNode.get(OriginTrackedYamlLoader.java:133)
	at java.util.stream.ReferencePipeline$3$1.accept(ReferencePipeline.java:193)
	at java.util.ArrayList$ArrayListSpliterator.forEachRemaining(ArrayList.java:1384)
	at java.util.stream.AbstractPipeline.copyInto(AbstractPipeline.java:482)
	at java.util.stream.AbstractPipeline.wrapAndCopyInto(AbstractPipeline.java:472)
	at java.util.stream.ReduceOps$ReduceOp.evaluateSequential(ReduceOps.java:708)
	at java.util.stream.AbstractPipeline.evaluate(AbstractPipeline.java:234)
	at java.util.stream.ReferencePipeline.collect(ReferencePipeline.java:566)
	at org.springframework.boot.env.OriginTrackedYamlLoader$OriginTrackingConstructor.replaceMappingNodeKeys(OriginTrackedYamlLoader.java:99)
	at org.springframework.boot.env.OriginTrackedYamlLoader$OriginTrackingConstructor.constructObject(OriginTrackedYamlLoader.java:92)
	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$1.next(Yaml.java:547)
	at org.springframework.beans.factory.config.YamlProcessor.process(YamlProcessor.java:160)
	at org.springframework.beans.factory.config.YamlProcessor.process(YamlProcessor.java:134)
	at org.springframework.boot.env.OriginTrackedYamlLoader.load(OriginTrackedYamlLoader.java:75)
	at org.springframework.boot.env.YamlPropertySourceLoader.load(YamlPropertySourceLoader.java:50)
	at org.springframework.boot.context.config.ConfigFileApplicationListener$Loader.loadDocuments(ConfigFileApplicationListener.java:574)
	at org.springframework.boot.context.config.ConfigFileApplicationListener$Loader.load(ConfigFileApplicationListener.java:528)
	at org.springframework.boot.context.config.ConfigFileApplicationListener$Loader.loadForFileExtension(ConfigFileApplicationListener.java:502)
	at org.springframework.boot.context.config.ConfigFileApplicationListener$Loader.load(ConfigFileApplicationListener.java:469)
	at org.springframework.boot.context.config.ConfigFileApplicationListener$Loader.lambda$null$6(ConfigFileApplicationListener.java:450)
	at java.lang.Iterable.forEach(Iterable.java:75)
	at org.springframework.boot.context.config.ConfigFileApplicationListener$Loader.lambda$load$7(ConfigFileApplicationListener.java:449)
	at java.lang.Iterable.forEach(Iterable.java:75)
	at org.springframework.boot.context.config.ConfigFileApplicationListener$Loader.load(ConfigFileApplicationListener.java:446)
	at org.springframework.boot.context.config.ConfigFileApplicationListener$Loader.load(ConfigFileApplicationListener.java:334)
	at org.springframework.boot.context.config.ConfigFileApplicationListener.addPropertySources(ConfigFileApplicationListener.java:209)
	at org.springframework.boot.context.config.ConfigFileApplicationListener.postProcessEnvironment(ConfigFileApplicationListener.java:192)
	at org.springframework.boot.context.config.ConfigFileApplicationListener.onApplicationEnvironmentPreparedEvent(ConfigFileApplicationListener.java:179)
	at org.springframework.boot.context.config.ConfigFileApplicationListener.onApplicationEvent(ConfigFileApplicationListener.java:165)
	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:75)
	at org.springframework.boot.SpringApplicationRunListeners.environmentPrepared(SpringApplicationRunListeners.java:54)
	at org.springframework.boot.SpringApplication.prepareEnvironment(SpringApplication.java:347)
	at org.springframework.boot.SpringApplication.run(SpringApplication.java:306)
	at org.springframework.boot.SpringApplication.run(SpringApplication.java:1260)
	at org.springframework.boot.SpringApplication.run(SpringApplication.java:1248)

解決

核對了下引入的包，發(fā)現(xiàn)項目中額外引入了1.19版本的org.yaml.snakeyaml包，這個包里確實沒有這個方法。把這個包改成1.26的即可。

SpringBoot配置文件application.yml遇到的坑

1.第一個坑

原代碼：

username:root
password:123456

項目啟動報以下異常：

Caused by: org.yaml.snakeyaml.scanner.ScannerException: while scanning a simple key

產(chǎn)生問題的根源：application.yml文件鍵、值對之間要用冒號：隔開，而且冒號和值之間有一個空格

上述異常產(chǎn)生的就是鍵后面的：號緊接著寫值，沒有留一個空格。

解決辦法：

冒號：后面留出一個空格后再寫值

2.第二個坑

原代碼參見下圖：

項目啟動以后報以下異常：

Caused by: org.yaml.snakeyaml.scanner.ScannerException: mapping values are not allowed here

或

Caused by: org.yaml.snakeyaml.parser.ParserException: while parsing a block mapping

expected <block end>, but found '<block mapping start>'
in 'reader', line 11, column 3:
jpa:

產(chǎn)生問題的根源：application.yml一級鍵，空一格寫就可以了。像Jpa這樣是一級鍵，下屬的database是二級鍵。