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debprakash shawdebprakash shaw 

I get null value when deserialize then Json object

Hi,
I get a null value when deserialize the JSON

This field value I deserialize. 
public class OrderUpdateJSON {

public ContactJson ContactJson;
    public class ContactJson{
        public String referrer_id;
        public String contact_email;
    }
    public static OrderUpdateJSON parse(String json) {
		return (OrderUpdateJSON) System.JSON.deserialize(json, OrderUpdateJSON.class);
	}
	
}
This is my class where I call a Deserialize class for Json2Apex convert 
public with sharing class DeletionScript {
    public static void ContactJson(List<Handle_JSON__c> contJson){    
            for(Handle_JSON__c hj:contJson){
                string bdy=hj.JSON__c;
                
                OrderUpdateJSON objMainJason=(OrderUpdateJSON) System.JSON.deserialize(bdy,OrderUpdateJSON.class);

                system.debug('objMainJason------->' + objMainJason); //I get here null value

                OrderUpdateJSON.ContactJson objAH=objMainJason.ContactJson;
                system.debug('objAH==>'+objAH);//i get null value here

                string referrer=objAH.referrer_id;
                string email=objAH.contact_email;            
               
             }
        }
    }

I get null value debug is

User-added imagePlease give me a suggestion to resolve this issue

Thanks in Advanced