JSONObject, null values

Core Library Questions

paerha

in Core Library Questions • 1 month ago

As far as other code I've seen, and some validators I've used, null is a valid value. I have a server using jackson which is sending key/value pairs with null values, but I'm unable to add a key/value pair to my JSONObject with a null value.

Simple example:

JSONObject jo = new JSONObject();

jo.setString("isadded", "yes");

jo.setString("notadded", null);

println(jo);

Am I missing something?

Replies(3)

PhiLho

Re: JSONObject, null values

1 month ago

setString() with a null value will remove the key from the JSONObject.
To have a null value, you have to add JSONObject.NULL.

paerha

Re: JSONObject, null values

1 month ago

Thanks for a quick reply ... and I may be missing something simple, but sticking to the available api,

if I replace the above setString call with any set*("notadded", JSONObject.NULL) method call will

generate a "... not applicable for the arguments (String, Object)" error.

PhiLho

Re: JSONObject, null values

1 month ago

Well, you don't add a String, an int or other typed things, you add a JSONObject, so you have to use:
setJSONObject(key, JSONObject.NULL);

(Finding these informations by looking into the source code of JSONObject.java).