ArrayIndexOutOfBoundsException: Index -1 out of bounds for length 1024 on large yml files after upgrading to Boot 2.6.4 and Spring Cloud 2021 .0.1

Since updating our config server to Spring Boot 2.6.4 and Spring Cloud 2021.0.1 we get the following error when trying to retrieve a large (500KB) config file via GET http://host:8888/config-file/dev.

Caused by: java.lang.ArrayIndexOutOfBoundsException: Index -1 out of bounds for length 1024
	at org.yaml.snakeyaml.reader.StreamReader.peek(StreamReader.java:136)
	at org.yaml.snakeyaml.scanner.ScannerImpl.scanToNextToken(ScannerImpl.java:1222)
	at org.yaml.snakeyaml.scanner.ScannerImpl.fetchMoreTokens(ScannerImpl.java:308)
	at org.yaml.snakeyaml.scanner.ScannerImpl.checkToken(ScannerImpl.java:248)
	at org.yaml.snakeyaml.parser.ParserImpl$ParseBlockMappingKey.produce(ParserImpl.java:634)
	at org.yaml.snakeyaml.parser.ParserImpl.peekEvent(ParserImpl.java:165)
	at org.yaml.snakeyaml.comments.CommentEventsCollector$1.peek(CommentEventsCollector.java:59)
	at org.yaml.snakeyaml.comments.CommentEventsCollector$1.peek(CommentEventsCollector.java:45)
	at org.yaml.snakeyaml.comments.CommentEventsCollector.collectEvents(CommentEventsCollector.java:140)
	at org.yaml.snakeyaml.comments.CommentEventsCollector.collectEvents(CommentEventsCollector.java:119)
	at org.yaml.snakeyaml.composer.Composer.composeScalarNode(Composer.java:214)
	at org.yaml.snakeyaml.composer.Composer.composeNode(Composer.java:184)
	at org.yaml.snakeyaml.composer.Composer.composeValueNode(Composer.java:314)
	at org.yaml.snakeyaml.composer.Composer.composeMappingChildren(Composer.java:305)
	at org.yaml.snakeyaml.composer.Composer.composeMappingNode(Composer.java:286)
	at org.yaml.snakeyaml.composer.Composer.composeNode(Composer.java:188)
	at org.yaml.snakeyaml.composer.Composer.composeValueNode(Composer.java:314)
	at org.yaml.snakeyaml.composer.Composer.composeMappingChildren(Composer.java:305)
	at org.yaml.snakeyaml.composer.Composer.composeMappingNode(Composer.java:286)
	at org.yaml.snakeyaml.composer.Composer.composeNode(Composer.java:188)
	at org.yaml.snakeyaml.composer.Composer.composeValueNode(Composer.java:314)
	at org.yaml.snakeyaml.composer.Composer.composeMappingChildren(Composer.java:305)
	at org.yaml.snakeyaml.composer.Composer.composeMappingNode(Composer.java:286)
	at org.yaml.snakeyaml.composer.Composer.composeNode(Composer.java:188)
	at org.yaml.snakeyaml.composer.Composer.getNode(Composer.java:115)
	at org.yaml.snakeyaml.constructor.BaseConstructor.getData(BaseConstructor.java:135)
	at org.springframework.boot.env.OriginTrackedYamlLoader$OriginTrackingConstructor.getData(OriginTrackedYamlLoader.java:99)
	at org.yaml.snakeyaml.Yaml$1.next(Yaml.java:514)
	at org.springframework.beans.factory.config.YamlProcessor.process(YamlProcessor.java:198)
	at org.springframework.beans.factory.config.YamlProcessor.process(YamlProcessor.java:166)
	at org.springframework.boot.env.OriginTrackedYamlLoader.load(OriginTrackedYamlLoader.java:84)
	at org.springframework.boot.env.YamlPropertySourceLoader.load(YamlPropertySourceLoader.java:50)
	at org.springframework.boot.context.config.StandardConfigDataLoader.load(StandardConfigDataLoader.java:54)
	at org.springframework.boot.context.config.StandardConfigDataLoader.load(StandardConfigDataLoader.java:36)
	at org.springframework.boot.context.config.ConfigDataLoaders.load(ConfigDataLoaders.java:107)
	at org.springframework.boot.context.config.ConfigDataImporter.resolveAndLoad(ConfigDataImporter.java:86)
	at org.springframework.boot.context.config.ConfigDataEnvironmentContributors.withProcessedImports(ConfigDataEnvironmentContributors.java:116)
	at org.springframework.boot.context.config.ConfigDataEnvironment.processInitial(ConfigDataEnvironment.java:240)
	at org.springframework.boot.context.config.ConfigDataEnvironment.processAndApply(ConfigDataEnvironment.java:227)
	at org.springframework.boot.context.config.ConfigDataEnvironmentPostProcessor.postProcessEnvironment(ConfigDataEnvironmentPostProcessor.java:102)
	at org.springframework.boot.context.config.ConfigDataEnvironmentPostProcessor.applyTo(ConfigDataEnvironmentPostProcessor.java:201)
	at org.springframework.cloud.config.server.environment.NativeEnvironmentRepository.findOne(NativeEnvironmentRepository.java:140)

The tipping point seems to be about 290KB or 10,000 lines. We have updated from Spring Boot 2.4.3 and Spring Cloud 2020.0.2 where we could retrieve the file successfully.

Example bootstrap config:

spring:
  config:
    additional-location: file:/run/secrets/auth.yml,file:/run/secrets/app-secrets.yml
  application:
    name: config-app
  cloud:
    inetutils:
      ignored-interfaces:
        - eth0
        - eth1
        - eth2
        - eth3
        - lo
    consul:
      discovery:
        instanceId: ${spring.application.name}:${random.value}
      host: consul
      port: 8500
    config:
      name: large-config-file
      discovery:
        enabled: true
        serviceId: Config-Server
      username: xxxx
      password: xxxx
      fail-fast: true
      retry:
        initialInterval: 6000
        maxInterval: 6000
        maxAttempts: 10
  profiles:
    active: dev

server:
  tomcat:
    accesslog:
      enabled: true
      pattern: '%h %l %u %t "%r" %s %b %D %{X-B3-TraceId}i %{X-B3-SpanId}i'
      directory: "/dev"
      prefix: "stdout"
      buffered: false
      suffix: ""
      file-date-format: ""

[mhalbritter]

Hi!

If you'd like us to spend some time investigating, please take the time to provide a complete minimal sample (something that we can unzip or git clone, build, and deploy) that reproduces the problem.

[spring-projects-issues]

If you would like us to look at this issue, please provide the requested information. If the information is not provided within the next 7 days this issue will be closed.

[spring-projects-issues]

Closing due to lack of requested feedback. If you would like us to look at this issue, please provide the requested information and we will re-open the issue.

[ruanych]

I also encountered this problem just now. After investigation, I found that the place where the error is triggered lies in this configuration:
spring.application.name in application.yml.

If the input contains some characters, the exception will be thrown, I tested - ~ _ and they all cause the exception to be thrown.

I would venture to guess that the exception mentioned above is due to its configuration spring.application.name being config-app.

[mhalbritter]

This does only happen if spring-cloud is used, right?

[ruanych]

I am using springboot to build a web project and not using springcloud. I just tried it again, but this time with no errors!

I can't quickly locate where the problem is right now. If it reappears later, I will record more detailed content and try to give a reproduction plan.

[JalalSordo]

imp having the same problem with spring boot 2.6.7 and 2021.0.2, I'm not sure if its related...

[philwebb]

@JalalSordo Are you able to provide a sample application that replicates the problem?