[BUG] [JAVA] Description

Description

Api generation with config option models=true or models=false throws:

Exception in thread "main" java.lang.ClassCastException: java.lang.Boolean cannot be cast to java.util.List
        at org.openapitools.codegen.DefaultCodegen.updateAllModels(DefaultCodegen.java:273)
        at org.openapitools.codegen.DefaultGenerator.generateModels(DefaultGenerator.java:477)
        at org.openapitools.codegen.DefaultGenerator.generate(DefaultGenerator.java:923)
        at org.openapitools.codegen.cmd.Generate.run(Generate.java:416)
        at org.openapitools.codegen.OpenAPIGenerator.main(OpenAPIGenerator.java:60)

openapi-generator version

4.1.3

OpenAPI declaration file content or url

Petstore example file

Command line used for generation

openapi-generator generate -i /tmp/petstore.json -o /tmp/petstore -g java --library=resttemplate -c /tmp/config.json

Steps to reproduce

Create file /tmp/config.json with contents:

{
  "models": true
}

Download petstore.json to /tmp

Run command:
openapi-generator generate -i /tmp/petstore.json -o /tmp/petstore -g java --library=resttemplate -c /tmp/config.json

Related issues/PRs

Didn't found any

Suggest a fix

Start at DefaultCodegen.java:273, where the stack trace shows the ClassCastException during updateAllModels, and trace how the models config value is read from /tmp/config.json. Reproduce with the petstore.json example and the provided Java RestTemplate command; done means generation completes without the exception for models=true and models=false.