How do you set a value to null with org.json.JSONObject in java?

Question

How do you set a value to null with org.json.JSONObject in java? I can certainly read if a value is null by using isNull - but it seems like when I put null, it just ignores

Answer 1

Try to set JSONObject.NULL instead of null:

A sentinel value used to explicitly define a name with no value. Unlike null, names with this value:

• show up in the names() array
• show up in the keys() iterator
• return true for has(String)
• do not throw on get(String)
• are included in the encoded JSON string.

This value violates the general contract of equals(Object) by returning true when compared to null. Its toString() method returns "null".

Answer 2

For me with net.sf.json.JSONObject I need to create a null JSON by

new JSONObject(true)

This is how I get class into groovy:

groovy.grape.Grape.grab(group: "org.kohsuke.stapler", module: "json-lib", version: "2.4-jenkins-2")