Make GSON accept single objects where it expects arrays

Question

I have bunch of model classes which have fields of type List where X is one of many things (e.g. String, Integer

Answer 1

You can simply write your own JsonDeserializer where you check whether your bleh or foo are JsonObjects or JsonArrays.

To check if a JsonElement is an array or an object:

JsonElement element = ...;
if (element.isJsonObject()) {
    //element is a JsonObject
} else if (element.isJsonArray()) {
    //element is a JsonArray
}