Spring boot OpenAPI 3 download multipart with JSON content and attachment - spring-boot

Question

I am seeing a 406 error when I try to download a file with Swagger 3.0 schema definition. The schema definition for a multipart file download which looks something like the below.
"get": {
"operationId": "getAttachment",
"summary": "Retrieve attachments to a existing Ticket",
"tags": [
"changeRequest"
],
"parameters": [
{
"required": true,
"name": "id",
"in": "path",
"description": "Identifier of the Change Request",
"schema": {
"type": "string"
}
}
],
"responses": {
"200": {
"description": "Ok",
"headers": {
},
"content": {
"multipart/form-data": {
"schema": {
"type": "object",
"properties": {
"metadata": {
"$ref": "#/components/schemas/Attachment"
},
"file": {
"type": "string",
"format":"binary",
"description": "Actual File Attachment"
}
}
}
}
}
}
}
}
It generates the following class when built using the swagger plugin which seems to be apt:
public class InlineResponse200 {
#JsonProperty("metadata")
private Attachment metadata = null;
#JsonProperty("file")
private Resource file;
Following is the implementation generated:
#ApiOperation(value = "Retrieve attachments to a existing Ticket", nickname = "getAttachment", notes
= "", response = InlineResponse200.class, tags={ "changeRequest", })
#RequestMapping(value = "/changeRequest/attachment/{id}",
produces = { "multipart/form-data", "application/json" },
method = RequestMethod.GET)
public ResponseEntity<InlineResponse200> getAttachment(#PathVariable("id") String id) {
Attachment lAttachmentMetadata = new Attachment();
lAttachmentMetadata.setDescription("This is a sample description");
lAttachmentMetadata.setSize(2000);
FileSystemResource fileSysResource = new FileSystemResource(new File("C:\\Projects\\Service Assurance\\Chnage Mgmt\\Attachments\\attachment.txt"));
InlineResponse200 responseObject = new InlineResponse200();
responseObject.setFile(fileSysResource);
responseObject.setMetadata(lAttachmentMetadata);
return ResponseEntity.ok().header(HttpHeaders.CONTENT_DISPOSITION,
"attachment; filename=\"" + fileSysResource.getFilename() + "\"").header("Content-Type", "multipart/form-data").body(responseObject);
}
When I invoke the service I see a 406 error returned
Thu Oct 15 03:46:39 IST 2020:DEBUG:<< "{"timestamp":"2020-10-14T22:16:39.258Z","status":406,"error":"Not Acceptable","message":"Could not find acceptable representation","path":"/changeManagement/api/v1/changeRequest/attachment/1234"}"
SOAPUI REST SERVICE TEST
Any help or pointers in the right direction would be much appreciated.