[BUG] NullPointerException when loading configuration

Description

I have an automatic build pipeline that uses the openapi generator to create a python-flask server. Today the builds started failing with a NullPointerException and the below mentioned stack-trace.

openapi-generator version

I use the following Docker Image: openapitools/openapi-generator-cli latest 132da9168d58

OpenAPI declaration file content or url

Seems to be irrelevant, also happens with the swagger petstore.

Generation Details

docker run --rm -u $(id -u) -v "$(pwd):/local" openapitools/openapi-generator-cli generate -i /local/openapi.yaml -g python-flask -o /local/app -c /local/config.json --package-name PKGNAM --skip-operation-example

Contents of config.json:

{
        "packageName": "PKGNAM",
        "serverPort": "8080"
}

Output

Exception in thread "main" java.lang.NullPointerException
	at java.base/java.lang.String.concat(Unknown Source)
	at org.openapitools.codegen.CodegenConfigLoader.forName(CodegenConfigLoader.java:48)
	at org.openapitools.codegen.config.CodegenConfigurator.fromFile(CodegenConfigurator.java:94)
	at org.openapitools.codegen.cmd.Generate.execute(Generate.java:272)
	at org.openapitools.codegen.cmd.OpenApiGeneratorCommand.run(OpenApiGeneratorCommand.java:32)
	at org.openapitools.codegen.OpenAPIGenerator.main(OpenAPIGenerator.java:66)

[idkCpp]

I now use openapitools/openapi-generator-cli:latest-release instead of openapitools/openapi-generator-cli:latest. For me this works fine.

[provokateurin]

Hello, I’m also facing this issue and did a bisect and found out that commit dd3bba8c9442f2ee40d6ea8f0872ab0be43714b9 broke it. @spacether pinging you as the author of the commit.