[java] File uploads in multipart/form-data request body's are generated as a byte[] argument instead of File

[lion7]

When attempting to specify file uploads in a multipart/form-data schema the Java generator will generate a method that takes a byte[] argument. But the OpenAPI Specification 3.0 states that byte arrays are properties defined as:

requestBody:
  content:
    multipart/form-data:
      schema:
        type: object
        properties:
          myByteArray:
            type: string
            format: byte

Specifying a binary type such as a file upload can be defined by using the binary format:

requestBody:
  content:
    multipart/form-data:
      schema:
        type: object
        properties:
          myFileUpload:
            type: string
            format: binary

I'd expect that in the generated Java code this would be a java.util.File argument. That way the used HTTP client can properly determine the Content-Type and Content-Disposition headers, where the latter contains the filename. These headers are both mandatory when submitting a file upload according to the multipart specification.

[lion7]

Closing this as the PR has been merged.