problem in accessing the hidden variable from a jsp page.

[rammie singh]

Hi every body.

i am having problem in accesing a hidden variable from a jsp page.

my problem description is



i have a hidden variable "statusHidn" in my jsp page.

  

<input type="hidden" name="statusHidn" value="">

i am appending int values of an array into it through javascript function.

the function is as below

function submitForm()
            {
                alert("Hi");
                var table=document.getElementById('tbl_thumbRule');
                var rowsLength=table.rows.length;                
                alert("rowlength = "+rowsLength);
                

                // making all the index value 0 which are untouched.
                for(i=0;i<rowsLength-1;i++)
                {                    
                    if(document.thumbRuleForm.thumbRuleHiddenStatus[i].value=="")
                    {
                        document.thumbRuleForm.thumbRuleHiddenStatus[i].value=0;
                    }
                }

                var lengthHiddenStatusArray=document.thumbRuleForm.thumbRuleHiddenStatus.length;
                var statusHidnPush="";                
                
                
                for(i=0;i<lengthHiddenStatusArray;i++)
                {
                    
                   
                    statusHidnPush = statusHidnPush + document.thumbRuleForm.thumbRuleHiddenStatus[i].value + ":";
                    
                }
                 
                document.thumbRuleForm.statusHidn.value = statusHidnPush;              /* assigning the string(which consists of integers) 
                                                                                                                           to hidden variable  */

}

now i am trying to access this variable in my servlet as

String statusHidn=null;
            int[] status=null;
            
           
            {
                if(!(request.getParameter("statusHidn").equals("")))
                {
                    System.out.println("to print hidden status");
                    statusHidn=request.getParameter("statusHidn").toString();
                    System.out.println("hidden status is " + statusHidn);
                }                
                if(statusHidn!=null)
                {
                    String[] statusArray=null;
                    
                    statusArray=statusHidn.split(":");//
                    for(int i=0;i<statusArray.length;i++)
                    {
                        
                        int statusInt=Integer.parseInt(statusArray[i]);
                        System.out.println("after assigning ");
                        System.out.println("statusInt value is  " + statusInt);
                        [b]status[i]=statusInt;[/b]   // [b]giving null pointer exception at this line of code.[/b]
                        
                        System.out.println("status values are " + status[i] );  // [b]this line is not getting printed[/b]
                    }
                }
          }

it is giving null pointer exception when i am trying to assign status[i]=statusInt;


may be there is some problem of String to int conversion. i tried lot's of things but still exception error is coming.

can any body help me please in finding what is the reason for this and what could be the solution.


Thanks and Regards.

[David Newton]

Because the status array is null--you never assign it to anything.

[rammie singh]

hi

initially status[] would be null only.
so what is the solution for this??

Thanks and Regards.

[Seetharaman Venkatasamy]

rammie singh wrote:
so what is the solution for this??

you need to initialize right?. or use ArrayList. but dont use like below

   
ArrayList<Object> arrayList = null;
arrayList.add("your value");