Deserialize json doesn' work for a class with parent constructor

[pierre03]

Hello,
Here is my problem, i have a json object, which is like that:

{"commandId":"1","result":"ok","devices":[{"PluginId":"Device 1","DisplayName":"Device 1"},{"PluginId":"Device 2","DisplayName":"Device 2"}],"message":""}

The commandId and result is defined in GeneralResponse, for the other parameters, here is the class:

export class PluginParam {
  @JsonProperty('**PluginId**')
  public **pluginId**: string;
  @JsonProperty('**DisplayName**')
  public **displayName**: string;

  constructor() {
    this.PluginId = undefined;
    this.DisplayName = undefined;
  }
}
export class GetDevicesResponse extends GeneralResponse {
  @JsonProperty({clazz: PluginParam, name: 'devices'})
  public devices: PluginParam[];
  public message: string;
  constructor() {
    super();
    this.devices = void 0;
    this.message = void 0;
  }
}

When i get the jsonobject, i do this to use it:

processGetDevice(object: GetDevicesResponse): void {
  console.log('processGetDevice, devices', object.devices);
  console.log('processGetDevice', object);
  console.log('processGetDevice, devices 0 ', object.devices[0].PluginId);
  if (object.result === 'ok' || object.devices.length > 0) {
    this.selectedDevice = object.devices[0].PluginId;
      } else if (object.result === 'error') {
    this.toasterService.pop('error', 'processGetDevice', object.message);
  }
}

But i can not get the pluginId and the displayName, it seems that the JsonProperty doesn't work here.
When i replace pluginId by PluginId and displayName by DisplayName, everything is ok.
Do you have any idea, please? Is it related to the function super()?
Thank you.