title: How to handle offline mode for Google visualisation in GWT
body: <p>I have a GWT application that uses many Google maps and charts. I want to have an offline mode where the user have the application installed on his the computer and without using the Google apps, he can continue using the other features.</p>
  
  <p>For now the maps in the application throught a nullpointer error because they cannot initialize. I thought about checking the internet connection in EntryPoint and change the behaviour accordingly,  but I am hoping for a simpler solution. Any thought ?</p>