Swagger-codegen: Generated JAVA API does not support file upload

[u1982]

Description

I generated a Java API which should allow me to upload files, but it does not. Looks like there is something wrong with choosing the right content type

Swagger-codegen version

Swagger declaration file content or url

...

basePath: /
produces:

• application/json
  paths:
  /1/upload:
  post:
  summary: Upload document
  operationId: upload
  parameters:
  #...
  - name: file1
  in: formData
  description: File 1
  required: true
  type: file
  responses:
  default:
  description: UploadResponse
  schema:
  $ref: '#/definitions/UploadResponse'
  #...
  definitions:
  UploadResponse:
  type: object
  properties:
  taskId:
  type: string
  #...

Steps to reproduce

1. Generate JAVA API
2. use upload

[wing328]

@u1982 have you tried to set a proper consumes?

e.g. https://github.com/swagger-api/swagger-codegen/blob/master/modules/swagger-codegen/src/test/resources/2_0/petstore.yaml#L253

[u1982]

I did not. Thank you, that partially solves the problem. Now I can upload files. Unfortunately, now the Content Type multipart/form-data is also set for the Parameters, which should not be the case. Is there an option to change that in the swagger.yaml? Here is what I changed in the Class ApiClient to make it work:
public Object serialize(Object obj, String contentType, Map<String, Object> formParams) throws ApiException { if (contentType.startsWith("multipart/form-data")) { //... mp.bodyPart(new FileDataBodyPart(param.getKey(),file,MediaType.APPLICATION_OCTET_STREAM_TYPE)) //originally, it is also MediaType.MULTIPART_FORM_DATA_TYPE here } else { mp.field(param.getKey(), parameterToString(param.getValue()), MediaType.MULTIPART_FORM_DATA_TYPE); } } return mp; //... }

[wing328]

What do you mean by content type multipart/form-data set for parameter?j

Please share your spec via http://gist.github.com.

[u1982]

Here are HTTP Post like the autogenerated C# and Java clients produce. The C# Version works fine, the Java Version not. In the Java client's POST, everything what is declared in "parameters" in the swagger.yaml has the extra "Content-Type: multipart/form-data" which causes the error. In the C# client's POST the uploaded files Content-Type is application/octet-stream.
Changing the ApiClient.java like I did here forces the Java Client to produce a working HTTP POST.

[wing328]

For Java API client, can you try the retrofit2 API client instead to see if it has the same issue?

Here is an FAQ on how to specify library: https://github.com/swagger-api/swagger-codegen/wiki/FAQ#how-can-i-generate-an-android-sdk