spring-cloud-config配置中心报错：java.lang.IllegalStateException: duplicate key: spring_springboot启动 java.lang.illegalstateexception: dupl-优快云博客

本文探讨了在Spring Boot应用中使用YAML配置文件时出现的java.lang.IllegalStateException异常，详细分析了错误堆栈，指出问题在于YAML文件中的重复键'spring'。文章进一步解释了YAML文件的正确格式规范，包括如何使用三个连字号区分多个文档及使用三个点号表示文档结束。

java.lang.IllegalStateException: duplicate key: spring
    at org.yaml.snakeyaml.constructor.SafeConstructor.processDuplicateKeys(SafeConstructor.java:99) ~[snakeyaml-1.19.jar:na]
    at org.yaml.snakeyaml.constructor.SafeConstructor.flattenMapping(SafeConstructor.java:70) ~[snakeyaml-1.19.jar:na]
    at org.yaml.snakeyaml.constructor.SafeConstructor.constructMapping2ndStep(SafeConstructor.java:182) ~[snakeyaml-1.19.jar:na]
    at org.yaml.snakeyaml.constructor.BaseConstructor.constructMapping(BaseConstructor.java:443) ~[snakeyaml-1.19.jar:na]
    at org.yaml.snakeyaml.constructor.SafeConstructor$ConstructYamlMap.construct(SafeConstructor.java:519) ~[snakeyaml-1.19.jar:na]
    at org.yaml.snakeyaml.constructor.BaseConstructor.constructObjectNoCheck(BaseConstructor.java:207) ~[snakeyaml-1.19.jar:na]
    at org.yaml.snakeyaml.constructor.BaseConstructor.constructObject(BaseConstructor.java:196) ~[snakeyaml-1.19.jar:na]
    at org.springframework.boot.env.OriginTrackedYamlLoader$OriginTrackingConstructor.constructObject(OriginTrackedYamlLoader.java:94) ~[spring-boot-2.0.2.RELEASE.jar:2.0.2.RELEASE]
    at org.yaml.snakeyaml.constructor.BaseConstructor.constructDocument(BaseConstructor.java:161) ~[snakeyaml-1.19.jar:na]
    at org.yaml.snakeyaml.constructor.BaseConstructor.getData(BaseConstructor.java:127) ~[snakeyaml-1.19.jar:na]
    at org.yaml.snakeyaml.Yaml$1.next(Yaml.java:547) ~[snakeyaml-1.19.jar:na]