Swagger codegen for jax-rs 2.0 using mustache template doesn't work properly.

Description

We are using JAX-RS 2.0 which doesn't support PATCH, so we wrote a Custom PATCH which allows the generation but unable to support merge and patch json seperately.

Swagger-codegen version

gradle-swagger-generator-plugin-2.18.1-SNAPSHOT

Swagger declaration file content or url

'/{{classname}}/{id}':
patch:
operationId: merge{{classname}}
summary: Update a {{classname}}
description:
tags:
- Resource/{{classname}}
parameters:
- required: true
name: id
schema:
type: string
in: path
description:
- $ref: '#/components/parameters/fields'
- $ref: '#/components/parameters/depth'
- $ref: '#/components/parameters/expand'
requestBody:
description: .
required: true
content:
application/merge-patch+json:
schema:
$ref: '#/components/schemas/LogicalDeviceAccount'
application/json-patch+json:
schema:
$ref: '#/components/schemas/PatchRequest'
responses:
'200':
description:
content:
application/json:
schema:
$ref: '#'

Mustache template:

Generated code:
@PATCH
@Path("/{id}")
@Consumes({ "application/merge-patch+json", "application/json-patch+json" })
@Produces({ "application/json" })
...................

Suggest a fix/enhancement

As per our requirement we need to have two different consumers, as mentioned below.
@PATCH
@Path("/{id}")
@Consumes({ "application/json-patch+json" })
@Produces({ "application/json" })
@io.swagger.annotations.ApiOperation("")
@io.swagger.annotations.ApiResponses(value = { < 200...500 > })
public Response mergeMethod(@ApiParam(value = "The logical device to be updated." ,required=true) List body, @PathParam("id") String id, @QueryParam("fields") String fields, @Min(0) @Max(10) @QueryParam("depth") Integer depth, @QueryParam("expand") String expand,@Context SecurityContext securityContext)
/throws NotFoundException/ {
return service.<method(parameters)>;
}

@PATCH
@Path("/{id}")
@Consumes({ "application/merge-patch+json" })
@Produces({ "application/json" })
@io.swagger.annotations.ApiOperation"")
@io.swagger.annotations.ApiResponses(value = {< 200..500 > })
public Response mergeMethod(@ApiParam(value = "The logical device to be updated." ,required=true) LogicalDeviceType body, @PathParam("id") String id,  @QueryParam("fields") String fields, @Min(0) @Max(10)  @QueryParam("depth") Integer depth,  @QueryParam("expand") String expand,@Context SecurityContext securityContext)
/*throws NotFoundException*/ {
    return service. return service.<method(parameters)>;

Please help us on this as we are unable to generate the PATCH - httpmethod for both consumers using mustache seperately.

The issue names no source file or test; start by reproducing the JAX-RS 2.0 generation with the supplied OpenAPI declaration and Mustache template. Compare the generated PATCH methods with the requested output, and consider the work done when merge-patch and json-patch media types produce separate consumers and request signatures.