NPE in JSONObject.writeValue() about json-java HOT 2 CLOSED

I was curious why an element in the JSONArray is real null, instead of the Null object defined in JSONObject, and the reason is that method of JSONArray

public JSONArray put(Object value) {
this.myArrayList.add(value);
return this;
}

Maybe the correct code is:
public JSONArray put(Object value) {
this.myArrayList.add(JSONObject.wrap(value));
return this;
}

from json-java.

Thanks. Please try it now.

With respect to JSON, Java's null is ambiguous. Sometimes it means NULL, and sometimes it means something like JavaScript's undefined.

from json-java.