Hi
I have a Json string, I want to store it into custom object.
json string is:

'{"FRAPI":{"STATUS":"0","MSG":" ","ACCOUNTLIST":{"ACCOUNT":[{"ACCOUNTID":"1083302481D3","ACCOUNTNAME":"kelly Roosevelt","DEFAULTDATE":"20121231"},{"ACCOUNTID":"119334261AD3","ACCOUNTNAME":"Stephen King","DEFAULTDATE":"20121231"}]}}}'

I have written below code but I am getting null value in Wrapper output

global class json2Apex{
public string xmlstring{get;set;}
public string jsstring{get;set;}
public cls_FRAPI  Wrapper{get;set;}
public string resstring{get;set;}
public json2Apex(){
datapull();
}
public void datapull(){

    xmlstring= p.GetAccountList('TGAINES','FRdemo13!','DEMO201212','1');
  jsstring='{"FRAPI":{"STATUS":"0","MSG":" ","ACCOUNTLIST":{"ACCOUNT":[{"ACCOUNTID":"1083302481D3","ACCOUNTNAME":"Teddy Roosevelt","DEFAULTDATE":"20121231"},{"ACCOUNTID":"119334261AD3","ACCOUNTNAME":"Stephen King","DEFAULTDATE":"20121231"}]}}}';
      
      
      
       resstring=jsstring.replace('\\n','').replace('\\','').replace('"{','{').replace('}"','}');
      Wrapper =(cls_FRAPI ) System.JSON.deserialize(resstring, cls_FRAPI .class);
      System.debug('>>>>>'+Wrapper  );
 }  

   public cls_FRAPI FRAPI{get;set;}
    class cls_FRAPI {
        public String STATUS{get;set;}  //0
        public String MSG{get;set;}  // 
        public cls_ACCOUNTLIST ACCOUNTLIST{get;set;}
    }
    class cls_ACCOUNTLIST {
        public list<ACCOUNT> cls_ACCOUNT {get;set;}
    }
    class cls_ACCOUNT {
        public String ACCOUNTID{get;set;}    //1083302481D3
        public String ACCOUNTNAME{get;set;}  //Teddy Roosevelt
        public String DEFAULTDATE{get;set;} //20121231
    }
}

Result is:

cls_FRAPI:[ACCOUNTLIST=null, MSG=null, STATUS=null]

Please suggest the soluton.

Thanks