title: NullPointerexception in itemizedOverlay
body: <p>in android application I am using the Google API for maps. I got the following exception. I want to know what exactly this exception means ?</p>
  
  <pre><code>10-19 23:45:06.619: E/AndroidRuntime(837): FATAL EXCEPTION: main
  10-19 23:45:06.619: E/AndroidRuntime(837): java.lang.NullPointerException
  10-19 23:45:06.619: E/AndroidRuntime(837):  at com.google.android.maps.ItemizedOverlay.getItemsAtLocation(ItemizedOverlay.java:617)
  10-19 23:45:06.619: E/AndroidRuntime(837):  at com.google.android.maps.ItemizedOverlay.getItemAtLocation(ItemizedOverlay.java:586)
  10-19 23:45:06.619: E/AndroidRuntime(837):  at com.google.android.maps.ItemizedOverlay.handleMotionEvent(ItemizedOverlay.java:498)
  10-19 23:45:06.619: E/AndroidRuntime(837):  at com.google.android.maps.ItemizedOverlay.onTouchEvent(ItemizedOverlay.java:572)
  10-19 23:45:06.619: E/AndroidRuntime(837):  at com.google.android.maps.OverlayBundle.onTouchEvent(OverlayBundle.java:63)
  10-19 23:45:06.619: E/AndroidRuntime(837):  at com.google.android.maps.MapView.onTouchEvent(MapView.java:679)
  10-19 23:45:06.619: E/AndroidRuntime(837):  at android.view.View.dispatchTouchEvent(View.java:3885)
  10-19 23:45:06.619: E/AndroidRuntime(837):  at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:903)
  10-19 23:45:06.619: E/AndroidRuntime(837):  at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:869)
  10-19 23:45:06.619: E/AndroidRuntime(837):  at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:869)
  10-19 23:45:06.619: E/AndroidRuntime(837):  at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:869)
  10-19 23:45:06.619: E/AndroidRuntime(837):  at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:869)
  10-19 23:45:06.619: E/AndroidRuntime(837):  at com.android.internal.policy.impl.PhoneWindow$DecorView.superDispatchTouchEvent(PhoneWindow.java:1691)
  10-19 23:45:06.619: E/AndroidRuntime(837):  at com.android.internal.policy.impl.PhoneWindow.superDispatchTouchEvent(PhoneWindow.java:1125)
  10-19 23:45:06.619: E/AndroidRuntime(837):  at android.app.Activity.dispatchTouchEvent(Activity.java:2096)
  10-19 23:45:06.619: E/AndroidRuntime(837):  at com.android.internal.policy.impl.PhoneWindow$DecorView.dispatchTouchEvent(PhoneWindow.java:1675)
  10-19 23:45:06.619: E/AndroidRuntime(837):  at android.view.ViewRoot.deliverPointerEvent(ViewRoot.java:2194)
  10-19 23:45:06.619: E/AndroidRuntime(837):  at android.view.ViewRoot.handleMessage(ViewRoot.java:1878)
  10-19 23:45:06.619: E/AndroidRuntime(837):  at android.os.Handler.dispatchMessage(Handler.java:99)
  10-19 23:45:06.619: E/AndroidRuntime(837):  at android.os.Looper.loop(Looper.java:130)
  10-19 23:45:06.619: E/AndroidRuntime(837):  at android.app.ActivityThread.main(ActivityThread.java:3683)
  10-19 23:45:06.619: E/AndroidRuntime(837):  at java.lang.reflect.Method.invokeNative(Native Method)
  10-19 23:45:06.619: E/AndroidRuntime(837):  at java.lang.reflect.Method.invoke(Method.java:507)
  10-19 23:45:06.619: E/AndroidRuntime(837):  at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:839)
  10-19 23:45:06.619: E/AndroidRuntime(837):  at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:597)
  10-19 23:45:06.619: E/AndroidRuntime(837):  at dalvik.system.NativeStart.main(Native Method)
  </code></pre>