Throwing null pointerException in Timer.Schedule();

Question

In the following code
t.schedule(timertask, d.getDate(), 1000); is throwing NullPointer exception help me out

Goal :
My basic goal is to Run a method(every time after a fixed interval ) that will send some data to webservice from my android device

Date d = new Date();
    d.getDate();
    timertask = new TimerTask() {
        @Override
        public void run() {
            new Thread() {

                public void run() {
                    try {
                        ProDialog = ProgressDialog.show(Home.this,
                                "Sending Data",
                                "Please wait while sending data...");
                        Looper.prepare();
                        sendLocation();
                        handler.sendEmptyMessage(0);
                        quit();
                        Looper.loop();
                    } catch (Exception e) {
                        ProDialog.dismiss();
                    }
                }

                public void quit() {
                    ProDialog.dismiss();
                    Looper.myLooper().quit();
                }
            }.start();
        }
    };
try {
    t.schedule(timertask, d.getDate(), 1000);
} catch (Exception e) {
        e.printStackTrace();
}

You might have not initialized all your variables . – TRonZ Jun 15 '12 at 07:50 — TRonZ, Jun 15 '12 at 07:50

score 5 · Accepted Answer · answered Jun 15 '12 at 07:53

5

You need to initialize your

t

first.

Change

try {
        t.schedule(timertask, d.getDate(), 1000);
    } catch (Exception e) {
        e.printStackTrace();
    }

To

try 
 {
    Timer t=new Timer();
    t.schedule(timertask, d.getDate(), 1000);
 } 
catch (Exception e) 
 {
   e.printStackTrace();
 }

answered Jun 15 '12 at 07:53

Vipul

27,808
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or may do this : try { timertask .schedule(timertask, d.getDate(), 1000); } catch (Exception e) { e.printStackTrace(); } – Dheeresh Singh Jun 15 '12 at 07:56

score 1 · Answer 2 · edited May 23 '17 at 11:49

Basically NullPointerException throws where the required object is null.

The reasons for NullPointerException

Calling the instance method of a null object.
Accessing or modifying the field of a null object.
Taking the length of null as if it were an array.
Accessing or modifying the slots of null as if it were an array.
Throwing null as if it were a Throwable value.
Applications should throw instances of this class to indicate other illegal uses of the null object.

Explained in this link more eloborately What is a NullPointerException, and how do I fix it?

Throwing null pointerException in Timer.Schedule();

2 Answers2