Spring Cloud Config Exception when using property key with square bracket and array value

Describe the bug Spring Cloud Config 2.2.5.RELEASE I have an issue with the following configuration. The use of "[ is due to the > in the property name:

dms:
  standardization:  
    rules:
      "[XXX>yyy]":
        - XXX>www

An exception is thrown:

java.lang.ClassCastException: class java.util.LinkedHashMap cannot be cast to class java.util.List (java.util.LinkedHashMap and java.util.List are in module java.base of loader 'bootstrap')
        at org.springframework.cloud.config.server.environment.EnvironmentController$PropertyNavigator.setMapValue(EnvironmentController.java:375)
        at org.springframework.cloud.config.server.environment.EnvironmentController$PropertyNavigator.setMapValue(EnvironmentController.java:372)
        at org.springframework.cloud.config.server.environment.EnvironmentController$PropertyNavigator.setMapValue(EnvironmentController.java:372)
        at org.springframework.cloud.config.server.environment.EnvironmentController$PropertyNavigator.access$100(EnvironmentController.java:349)
        at org.springframework.cloud.config.server.environment.EnvironmentController.convertToMap(EnvironmentController.java:240)
        at org.springframework.cloud.config.server.environment.EnvironmentController.labelledYaml(EnvironmentController.java:204)
        at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)

By debugging the code, I see that the propertyKey is converted to dms.standardization.rules[XXX>yyy][0] which results in an IllegalArgumentException because the character after a square bracket is supposed to be a digit

https://github.com/spring-cloud/spring-cloud-config/blob/cec480ea2dfdf819dde95479d07e186b6ecc5f7d/spring-cloud-config-server/src/main/java/org/springframework/cloud/config/server/environment/EnvironmentController.java#L463

Comment From: spencergibb

Yes. It's not meant to be exhaustive because of incompatibilities between yaml and properties. If you can think of a fix that would be great, otherwise we'll see if there are others suffering from this issue.

Comment From: gbfvip

same issue here when try to define some cors configs for spring cloud gateway, the config I try to use is:

spring:
  cloud:
    gateway:
      enabled: true
      globalcors:
        cors-configurations:
          '[/**]':
            allowedOrigins: "*"
            allowedHeaders: "*"
            allowedMethods: "*"
            allowCredentials: true