polymorphism: swagger-codegen generates doubled classtype-attribute in json

[volkaoth]

TL;DR:
Using our polymorphic class-definitions, used e.g. in Tasks by Ports, Interfaces and Requirements in combination with the actual swagger-codegen master (version 2.3.0) results in a doubled listed classtype-attribute in the json output.
Solution: Redefining JsonTypeInfo in generated superclass models

Problem:
polymorphistic Classdefinitions in swagger:
e.g. Port-Definition:
superclass:

Port:
type: object
discriminator: type
description: |
Represents a communication port of a task
required:
- name
properties:
type:
description: |
Discriminator for polymorphism.
type: string
name:
type: string
description: |
Uniquely identifies a port. Defines the name of the environment variables holding IP addresses of remote tasks.

and the subclasses:

PortProvided:
type: object
description: Represents a communication port that the tasks provides for other tasks or the end user.
allOf:
- $ref: '#/definitions/Port'
- properties:
port:
type: integer
format: int32

PortRequired:
type: object
description: Represents a communication port that the task requires from other (downstream) tasks.
allOf:
- $ref: '#/definitions/Port'
- properties:
updateAction:
type: string
description: A script that is executed if a new instance of a downstream task is available.
isMandatory:
type: boolean
description: States if an instance of a downstream tasks needs to be already started (true), or if the task can start without a downstream task (false).

The generated Model of the superclass Port.java looks like:
(important therefor are the first lines)

@apimodel(description = "Represents a communication port of a task ")
@validated
@JsonTypeInfo(use = JsonTypeInfo.Id.NAME, include = As.PROPERTY, property = "type", visible = true )
@JsonSubTypes({
@JsonSubTypes.Type(value = PortRequired.class, name = "PortRequired"),
@JsonSubTypes.Type(value = PortProvided.class, name = "PortProvided"),
})
...

Resulting json output of a task using the polymophistic class-definition:

{"name":"TaskTest","ports":[{"type":"PortProvided","type":"PortProvided","name":"PortProvidedTest","port":12345},{"type":"PortRequired","type":"PortRequired","name":"PortRequiredTest","updateAction":"UpdateActionTest","isMandatory":true}],"interfaces":[{"type":"DockerInterface","type":"DockerInterface","dockerImage":"DockerImage"},{"type":"LanceInterface","type":"LanceInterface","init":"init","preInstall":"preInstall","install":"install","postInstall":"postInstall","preStart":"preStart","start":"start","startDetection":"startDetection","stopDetection":"stopDetection","postStart":"postStart","preStop":"preStop","stop":"stop","postStop":"postStop","shutdown":"shutdown"}],"executionEnvironment":"LANCE","requirements":[{"type":"OclRequirement","type":"OclRequirement","constraint":"oclRequirement"},{"type":"IdentifierRequirement","type":"IdentifierRequirement","hardwareId":"hardwareId","locationId":"locationId","imageId":"imageId"}],"taskType":"BATCH"}

Solution to avoid the highlighted doubled typedefintion:
changing the JsonTypeInfo in the superclass.
from "[...]include = AS.PROPERTY, property = "type"[...]"
to "[...]include = AS.EXISTING_PROPERTY, property = "type"[...]"