SpringBoot No subdirectories found for mandatory directory location 'file:./config/*/'.

After upgrading from Spring Boot 2.4.5 to 2.4.6 we get the following error when starting our application in Kubernetes:

11:11:03.360 [main] ERROR org.springframework.boot.SpringApplication - Application run failed
java.lang.IllegalStateException: No subdirectories found for mandatory directory location 'file:./config/*/'.
    at org.springframework.util.Assert.state(Assert.java:76)
    at org.springframework.boot.context.config.StandardConfigDataLocationResolver.resolvePatternEmptyDirectories(StandardConfigDataLocationResolver.java:268)
    at org.springframework.boot.context.config.StandardConfigDataLocationResolver.resolveEmptyDirectories(StandardConfigDataLocationResolver.java:257)
    at org.springframework.boot.context.config.StandardConfigDataLocationResolver.resolveEmptyDirectories(StandardConfigDataLocationResolver.java:248)
    at org.springframework.boot.context.config.StandardConfigDataLocationResolver.resolve(StandardConfigDataLocationResolver.java:239)
    at org.springframework.boot.context.config.StandardConfigDataLocationResolver.resolve(StandardConfigDataLocationResolver.java:117)
    at org.springframework.boot.context.config.ConfigDataLocationResolvers.lambda$resolve$1(ConfigDataLocationResolvers.java:115)
    at org.springframework.boot.context.config.ConfigDataLocationResolvers.resolve(ConfigDataLocationResolvers.java:126)
    at org.springframework.boot.context.config.ConfigDataLocationResolvers.resolve(ConfigDataLocationResolvers.java:115)
    at org.springframework.boot.context.config.ConfigDataLocationResolvers.resolve(ConfigDataLocationResolvers.java:107)
    at org.springframework.boot.context.config.ConfigDataImporter.resolve(ConfigDataImporter.java:105)
    at org.springframework.boot.context.config.ConfigDataImporter.resolve(ConfigDataImporter.java:97)
    at org.springframework.boot.context.config.ConfigDataImporter.resolveAndLoad(ConfigDataImporter.java:85)
    at org.springframework.boot.context.config.ConfigDataEnvironmentContributors.withProcessedImports(ConfigDataEnvironmentContributors.java:121)
    at org.springframework.boot.context.config.ConfigDataEnvironment.processInitial(ConfigDataEnvironment.java:243)
    at org.springframework.boot.context.config.ConfigDataEnvironment.processAndApply(ConfigDataEnvironment.java:230)
    at org.springframework.boot.context.config.ConfigDataEnvironmentPostProcessor.postProcessEnvironment(ConfigDataEnvironmentPostProcessor.java:102)
    at org.springframework.boot.context.config.ConfigDataEnvironmentPostProcessor.postProcessEnvironment(ConfigDataEnvironmentPostProcessor.java:94)
    at org.springframework.boot.env.EnvironmentPostProcessorApplicationListener.onApplicationEnvironmentPreparedEvent(EnvironmentPostProcessorApplicationListener.java:100)
    at org.springframework.boot.env.EnvironmentPostProcessorApplicationListener.onApplicationEvent(EnvironmentPostProcessorApplicationListener.java:86)
    at org.springframework.context.event.SimpleApplicationEventMulticaster.doInvokeListener(SimpleApplicationEventMulticaster.java:176)
    at org.springframework.context.event.SimpleApplicationEventMulticaster.invokeListener(SimpleApplicationEventMulticaster.java:169)
    at org.springframework.context.event.SimpleApplicationEventMulticaster.multicastEvent(SimpleApplicationEventMulticaster.java:143)
    at org.springframework.context.event.SimpleApplicationEventMulticaster.multicastEvent(SimpleApplicationEventMulticaster.java:131)
    at org.springframework.boot.context.event.EventPublishingRunListener.environmentPrepared(EventPublishingRunListener.java:82)
    at org.springframework.boot.SpringApplicationRunListeners.lambda$environmentPrepared$2(SpringApplicationRunListeners.java:63)
    at java.base/java.util.ArrayList.forEach(ArrayList.java:1541)
    at org.springframework.boot.SpringApplicationRunListeners.doWithListeners(SpringApplicationRunListeners.java:117)
    at org.springframework.boot.SpringApplicationRunListeners.doWithListeners(SpringApplicationRunListeners.java:111)
    at org.springframework.boot.SpringApplicationRunListeners.environmentPrepared(SpringApplicationRunListeners.java:62)
    at org.springframework.boot.SpringApplication.prepareEnvironment(SpringApplication.java:375)
    at org.springframework.boot.SpringApplication.run(SpringApplication.java:333)
    at org.springframework.boot.SpringApplication.run(SpringApplication.java:1329)
    at org.springframework.boot.SpringApplication.run(SpringApplication.java:1318)
    at com. ... .main(MainApplication.java:21)

Our filesystem looks like:

/app/
  config/
    application.yaml
  run.sh
  target/
    application.jar
    lib/
      <dependencies>

and the apps runs with working directory /app/. Seems to be looking for new mandatory directories?

It looks like a regression.

Comment From: snicoll

Thanks for the report but please consider searching the issue tracker before creating an issue.

Duplicate of #26627