Seems like Unit is the theme of my troubles today. I'm porting a JSON deserializer that uses Gson and when it comes to this for loop:

  def deserialize(json:JsonElement, 
                  typeOfT:Type, 
                  context:JsonDeserializationContext) = {
    var eventData = new EventData(null, null)
    var jsonObject = json.getAsJsonObject
    for(entry <- jsonObject.entrySet()) {
      var key = entry.getKey()
      var element = entry.getValue()
      element
      if("previous_attributes".equals(key)) {
        var previousAttributes = new scala.collection.mutable.HashMap[String, Object]()
        populateMapFromJSONObject(previousAttributes, element.getAsJsonObject())
        eventData.setPreviousAttributes(previousAttributes)
        eventData
      } else if ("object".equals(key)) {
        val `type` = element.getAsJsonObject().get("object").getAsString()
        var cl = objectMap.get(`type`).asInstanceOf[StripeObject]
        var `object` = abstractObject.retrieve(cl, key)
        eventData.setObject(`object`)
        eventData
      }
    }
  }

The compiler spits out the error type mismatch; found : Unit required: com.stripe.EventData and it points to this line here: for(entry <- jsonObject.entrySet())

Questions

1. Confirm that it is indeed the Gson method entrySet() appearing as unit?
2. If not, what part of the code is creating the issue? I've set return types/values for eventData class methods
3. Is there a workaround for the Gson Unit issue?

Thanks!