GSON how do I test for an key/value pair without throwing a null pointer exception

Question

I have a JsonArray of elements and I want to check each object in the array for a field "video" some items in the array will not have the key, some will have the key and it will be null, I want to only find the elements that have the key and it is not null

public void addItems(ArrayList<JsonObject> j) {

    if (j.size() > 0) {


        ArrayList<String> videos = new ArrayList<String>();

        for (int i = 0; i < j.size(); i++) {

            try {
                JsonElement test = j.get(i).getAsJsonObject().get("video");

                if(!test.isJsonNull()){
                    videos.add(test.getAsString());
                }
            }
            catch (JsonParseException e) {
                e.printStackTrace();
            }

        }

        if (videos.size() > 0) {
            cloudCache.downloadVideos(videos);
        }
    }
}

I keep getting null pointer exception on the line

 if(!test.isJsonNull()){
    videos.add(test.getAsString());
 }

Answer 1

Your JsonElement "test" is null for the object you are tring to find.
As you stated some objects have the video and others don't have.

Just change your code to:

if(test!=null && !test.isJsonNull()){
    videos.add(test.getAsString());
}