java gson - Check if JsonElement is string or JsonObject

Question

I'm trying to make an API backward-compatible by checking a value.

I have to determine if one of the parameters is a string or a JsonObject.

This is what I tried:

if (oDevices.get(i).getAsJsonPrimitive().isJsonObject()) {
                  deviceToClean.addProperty("deviceId", oDevices.get(i).getAsJsonObject().get("name").getAsString());
              } else if(oDevices.get(i).getAsJsonPrimitive().isString()) {
                  deviceToClean.addProperty("deviceId", oDevices.get(i).getAsString());
              }

When I send a JsonObject to the API, I get the following error:

This is not a JSON Primitive.

How I can check whether oDevices.get(i) is a json object or a string?

BackSlash · Accepted Answer · 2018-11-21 13:15:01Z

12

You are always getting the value as primitive.

Change this:

if (oDevices.get(i).getAsJsonPrimitive().isJsonObject()) {

to

if (oDevices.get(i).isJsonObject()) {

I would also change this:

if(oDevices.get(i).getAsJsonPrimitive().isString()) {

To this:

if(oDevices.get(i).isJsonPrimitive() && oDevices.get(i).getAsJsonPrimitive().isString()) {

// ----------------^ check if it's a json primitive before getting its value

edited Nov 21, 2018 at 13:15

answered Nov 21, 2018 at 13:12

BackSlash

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1 Comment

TheUnreal Over a year ago

Thanks @BackSlash. I thought the isJsonObject() method does not exists on a simple JsonElement.

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