Net.sf.json.JSONException:java.lang.NoSuchMethodException:Property ' name ' has no Getter Method__java

The source of the error:

JSON = Jsonobject.fromobject (t, jsonconfig). toString ();

Analysis: For diagram simplicity I write entity class user and test class in the same Java file.

The structure of my Code Testjson.java:

public class testjson{public
static void Main (string[] args) {
...
JSON = Jsonobject.fromobject (t, jsonconfig). toString ();
...
}

}
Class user{...
}

Parsing: Testjson.class files are generated when compiling Testjson.java files,
The user class is an internal class of the action class, and the Fromobject method searches the user class for the User.class by reflection mechanism, because the user class is an inner class, so the class is not found and there is no getter and setter method for the class attribute.
Solution: Extract the user class as a separate class.