[BUG] Generator tried to load relative ref from a non-existing path.

Description

I have created some yaml files, structured like:

• [common]
  • [data]
    • components.yml
  • [operation]
    • auth.yml
  • common.yml
• [amp]
  • amp.yml

Both common.yml and amp.yml refer to auth.yml, which refers to components.yml. See the following for details.

components.yml (Meta refers to ErrorCode):

ErrorCode:
  type: integer
  format: int64
  description: 0 for NoError, 100 for AuthenticationFailed

Meta:
  title: Meta
  type: object
  properties:
    error_code:
      $ref: ./component.yml#/ErrorCode
    redirect:
      title: Redirect
      type: object
      properties:
        url:
          type: string

auth.yml (oauth2_code2token response refers to Meta in components.yml):

oauth2_code2token:
  get:
    responses:
      200:
        description: OK
        content:
          application/json:
            schema:
              type: object
              title: Code2TokenResponse
              properties:
                meta:
                  $ref: ../data/component.yml#/Meta
                data:

common.yml (code2token refers to oauth2_code2token in auth.yml)

paths:
  /oauth2/code2token:
    $ref: ./operation/auth.yml#/oauth2_code2token

amp.yml (code2token refers to oauth2_code2token in auth.yml)

paths:
  /oauth2/code2token:
    $ref: ../common/operation/auth.yml#/oauth2_code2token

As above the only difference between amp.yml and common.yml is the relative reference path according to their different parent directories.

However, only common.yml can be successfully parsed and generated, while the amp.yml would generate the following error:

java.lang.RuntimeException: Unable to load RELATIVE ref: ../common/common/data/component.yml path: /autra/./api/amp
at io.swagger.v3.parser.util.RefUtils.readExternalRef(RefUtils.java:220)
at io.swagger.v3.parser.ResolverCache.loadRef(ResolverCache.java:150)
at io.swagger.v3.parser.processors.ExternalRefProcessor.processRefToExternalSchema(ExternalRefProcessor.java:88)
at io.swagger.v3.parser.processors.SchemaProcessor.processReferenceSchema(SchemaProcessor.java:236)
at io.swagger.v3.parser.processors.SchemaProcessor.processPropertySchema(SchemaProcessor.java:138)
at io.swagger.v3.parser.processors.SchemaProcessor.processSchemaType(SchemaProcessor.java:77)
at io.swagger.v3.parser.processors.SchemaProcessor.processSchema(SchemaProcessor.java:62)
at io.swagger.v3.parser.processors.ComponentsProcessor.processSchemas(ComponentsProcessor.java:231)
at io.swagger.v3.parser.processors.ComponentsProcessor.processComponents(ComponentsProcessor.java:145)
at io.swagger.v3.parser.OpenAPIResolver.resolve(OpenAPIResolver.java:73)
at io.swagger.v3.parser.OpenAPIResolver.resolve(OpenAPIResolver.java:59)
at io.swagger.v3.parser.OpenAPIV3Parser.resolve(OpenAPIV3Parser.java:238)
at io.swagger.v3.parser.OpenAPIV3Parser.readContents(OpenAPIV3Parser.java:181)
at io.swagger.v3.parser.OpenAPIV3Parser.readLocation(OpenAPIV3Parser.java:97)
at io.swagger.parser.OpenAPIParser.readLocation(OpenAPIParser.java:16)
at org.openapitools.codegen.config.CodegenConfigurator.toContext(CodegenConfigurator.java:637)
at org.openapitools.codegen.config.CodegenConfigurator.toClientOptInput(CodegenConfigurator.java:695)
at org.openapitools.codegen.cmd.Generate.execute(Generate.java:503)
at org.openapitools.codegen.cmd.OpenApiGeneratorCommand.run(OpenApiGeneratorCommand.java:32)
at org.openapitools.codegen.OpenAPIGenerator.main(OpenAPIGenerator.java:66)
Caused by: java.lang.RuntimeException: Could not find ../common/common/data/component.yml on the classpath
at io.swagger.v3.parser.util.ClasspathHelper.loadFileFromClasspath(ClasspathHelper.java:33)
at io.swagger.v3.parser.util.RefUtils.readExternalRef(RefUtils.java:214)
... 19 common frames omitted
[main] WARN o.o.codegen.utils.ModelUtils - Failed to get the schema name: ../common/common/data/component.yml#/ErrorCode
[main] WARN o.o.codegen.utils.ModelUtils - Failed to get the schema name: ../common/common/data/component.yml#/ErrorCode
Exception in thread "main" org.openapitools.codegen.SpecValidationException: There were issues with the specification. The option can be disabled via validateSpec (Maven/Gradle) or --skip-validate-spec (CLI).
| Error count: 1, Warning count: 0
Errors:
-Unable to load RELATIVE ref: ../common/common/data/component.yml path: /autra/./api/amp
at org.openapitools.codegen.config.CodegenConfigurator.toContext(CodegenConfigurator.java:668)
at org.openapitools.codegen.config.CodegenConfigurator.toClientOptInput(CodegenConfigurator.java:695)
at org.openapitools.codegen.cmd.Generate.execute(Generate.java:503)
at org.openapitools.codegen.cmd.OpenApiGeneratorCommand.run(OpenApiGeneratorCommand.java:32)
at org.openapitools.codegen.OpenAPIGenerator.main(OpenAPIGenerator.java:66)

This really confused me, for the string "common/common/data" does not even exist in my workspace.

I haved tried the followings:

1. Run ag "common/comon/data" . in my workspace, with no output at all.
2. Find string "common/common/data" in my Visual Studio Code, with no result.
3. Run docker system prune -a to remove all the cache, and force update the generator, tried to generate again, ending in the same error.
4. Run the generator image with sh as the substitution for the default entry point, and manually run /usr/local/bin/docker-entrypoint.sh generate in the container, ending in the same error.

Now I have no idea about what happened... Could anyone help me about that?

Thanks.

openapi-generator version

7.0.1-SNAPSHOT
(Using the docker image)

Reproduce the nested relative-reference case from the reported components.yml, auth.yml, common.yml, and amp.yml files. Start with RefUtils.readExternalRef and ResolverCache.loadRef, then trace how ExternalRefProcessor resolves the nested $ref path. Done means amp.yml resolves the same component chain as common.yml without constructing the duplicated common/common/data path.