[BUG] Java client (OkHttp) uses java.io.File for file parameters, instead of an InputStream

Bug Report Checklist

There is a serious design flaw in the Java client generated by default. Open to workarounds, have not been able to find one so far.

Description

Currently, if you have a binary string input parameter, the generated client takes a parameter of java.io.File. This is wrong because it means that you can only pass in a "local file" as a parameter. You cannot pass in a memory stream, which would be the more common case.

There does not seem to be an option to configure this, thus rendering the generated client completely useless for APIs that take in binary string / file parameter types. This is a huge issue. Would love to know if there is a workaround.

openapi-generator version

openapi-generator-cli-5.0.0-beta2.jar

OpenAPI declaration file content or url

https://api.cloudmersive.com/swagger/api/convert

Generation Details

See above

Steps to reproduce

See above

Related issues/PRs

N/A

Suggest a fix

Offer an option to use InputStream

Start by generating the Java client from the linked Cloudmersive Swagger declaration with openapi-generator-cli-5.0.0-beta2.jar and inspect how binary string or file parameters are represented. Trace the generated client and generator configuration for a way to use InputStream, then verify that generated APIs accept in-memory streams rather than only java.io.File.