How to declare one field as Map?

[Jeff Zhang]

I know in jsonschema2pojo additionalProperties is java Map, but how can I declare one specific field also as Map? e.g. I want the following field config to be a Map.

{
  "type":"object",
  "properties": {
    "config": {
        "type" : "string"
    }
  }
}

[Joe Littlejohn]

One option is to say: "existingJavaType": "java.util.Map<String,String>"

[Jeff Zhang]

Thanks @joelittlejohn