JSONNull cannot convert to JSONObject

[Andrew Hart]

Hi Andres,

The example of a custom bean processor on your blog page doesn't compile:

JsonConfig jsonConfig = new JsonConfig();  
jsonConfig.registerJsonBeanProcessor( Person.class,  
   new JsonBeanProcessor(){  
      public JSONObject processBean( Object bean, JsonConfig jsonConfig ){  
         if( !(bean instanceof Person) ){  
            return JSONNull.getInstance();  
         }  
         Person person = (Person) bean;  
         return new JSONObject()  
            .element( "name", person.getName() )  
            .element( "lastname", person.getLastname() );  
      }  
});

I get a type mismatch, cannot convert from JSONNull to JSONObject.  What should it return in this example?

[aalmiray]

Hi Andrew,

You are absolutely right, I wonder how I managed to write that on the first place. That method should return a 'null' JSONObject instead of JSONNull by doing the following

if( !(bean instanceof Person) ){ 
   return new JSONObject(true);  // marks the object as null
} 

I'll update the info on the page as well, thanks for spotting it!

Cheers,
Andres