title: Exception in Application start method occurs while calling Method
body: <p>I am coding a web browser in javafx. I am facing a problem in getting the title of the page currently open in the web engine. It gives me a bunch of errors while compiling the programe Whenever i call getTitle method(<code>private final String title = getTitle(webEngine);</code>)</p>
  
  <pre><code>// to get title of page currently open in web engine
  private static String getTitle(WebEngine webEngine) {    
  Document doc = webEngine.getDocument();
  NodeList heads = doc.getElementsByTagName("head");
  String titleText = webEngine.getLocation() ; // use location if page does not define a title
  if (heads.getLength() &gt; 0) {
      Element head = (Element)heads.item(0);
      NodeList titles = head.getElementsByTagName("title");
      if (titles.getLength() &gt; 0) {
          Node title = titles.item(0);
          titleText = title.getTextContent();            
      }
  }
  return titleText ;  
  }
  </code></pre>
  
  <p>The Error which i get is </p>
  
  <pre><code>    Exception in Application start method
  java.lang.reflect.InvocationTargetException
      at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
      at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
      at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
      at java.lang.reflect.Method.invoke(Method.java:483)
      at com.sun.javafx.application.LauncherImpl.launchApplicationWithArgs(LauncherImpl.java:363)
      at com.sun.javafx.application.LauncherImpl.launchApplication(LauncherImpl.java:303)
      at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
      at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
      at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
      at java.lang.reflect.Method.invoke(Method.java:483)
      at sun.launcher.LauncherHelper$FXHelper.main(LauncherHelper.java:767)
  Caused by: java.lang.RuntimeException: Exception in Application start method
      at com.sun.javafx.application.LauncherImpl.launchApplication1(LauncherImpl.java:875)
      at com.sun.javafx.application.LauncherImpl.lambda$launchApplication$147(LauncherImpl.java:157)
      at com.sun.javafx.application.LauncherImpl$$Lambda$53/1598924227.run(Unknown Source)
      at java.lang.Thread.run(Thread.java:745)
  Caused by: java.lang.NullPointerException
      at com.rajat.browser.Browser.getTitle(Main.java:307)
      at com.rajat.browser.Browser.&lt;init&gt;(Main.java:77)
      at com.rajat.browser.Main.start(Main.java:53)
      at com.sun.javafx.application.LauncherImpl.lambda$launchApplication1$153(LauncherImpl.java:821)
      at com.sun.javafx.application.LauncherImpl$$Lambda$59/857338418.run(Unknown Source)
      at com.sun.javafx.application.PlatformImpl.lambda$runAndWait$166(PlatformImpl.java:323)
      at com.sun.javafx.application.PlatformImpl$$Lambda$49/1401420256.run(Unknown Source)
      at com.sun.javafx.application.PlatformImpl.lambda$null$164(PlatformImpl.java:292)
      at com.sun.javafx.application.PlatformImpl$$Lambda$52/1424777668.run(Unknown Source)
      at java.security.AccessController.doPrivileged(Native Method)
      at com.sun.javafx.application.PlatformImpl.lambda$runLater$165(PlatformImpl.java:291)
      at com.sun.javafx.application.PlatformImpl$$Lambda$51/752848266.run(Unknown Source)
      at com.sun.glass.ui.InvokeLaterDispatcher$Future.run(InvokeLaterDispatcher.java:95)
      at com.sun.glass.ui.gtk.GtkApplication._runLoop(Native Method)
      at com.sun.glass.ui.gtk.GtkApplication.lambda$null$45(GtkApplication.java:126)
      at com.sun.glass.ui.gtk.GtkApplication$$Lambda$42/1469821799.run(Unknown Source)
      ... 1 more
  Exception running application com.rajat.browser.Main
  Java Result: 1
  </code></pre>
  
  <p>Somebody please help me in fixing this. I would be very thankfull to you. You can also check my project <a href="http://goo.gl/r5D3Wq" rel="nofollow">here</a> 
  Thank you :)</p>