title: call other class method from controller in javafx
body: <p>I am currently doing an app in JavaFx and in that I am calling main class method from Controller class.I have check sample example provided by Oracle and in that example it's working fine.
  Here it's my code:
  Main class:</p>
  
  <pre><code>public class Boiler_New extends Application {
  
  private Stage stage;
  @Override
  public void start(Stage primarystage) throws Exception {
      stage = primarystage;
      stage.setTitle("Login");
      call1("Login.fxml");
      stage.show();
  
  
  }
  public void call1(String fxml) throws IOException{
      FXMLLoader loader = new FXMLLoader();
      InputStream in = Boiler_New.class.getResourceAsStream(fxml);
      loader.setBuilderFactory(new JavaFXBuilderFactory());
      loader.setLocation(Boiler_New.class.getResource(fxml));
      AnchorPane root = (AnchorPane)loader.load(in);
       Scene scene = new Scene(root);
       stage.setScene(scene);
  
  }
  public static void main(String[] args) {
      launch(args);
  }
  }
  </code></pre>
  
  <p>Controller:</p>
  
  <pre><code>public class LoginController extends AnchorPane implements Initializable {
  
  private Boiler_New application ;
  @FXML
  private Label label;
  
  @FXML
  private AnchorPane login_panel;
  
  @FXML
  private Button login_button;
  
  @FXML
  private ImageView close_button;
  
  
  public void setApp(Boiler_New application){
      this.application = application;
  }
  
  @FXML
  public void login_act(ActionEvent event) throws Exception {
  
      application.call1("content.fxml");
  
  }
  
  @Override
  public void initialize(URL url, ResourceBundle rb) {
      // TODO
  
  }    
  }
  </code></pre>
  
  <p>Tracing:</p>
  
  <pre><code>Executing boiler_new.Boiler_New from C:\Users\BlackWorld\Documents\NetBeansProjects   \Boiler_New\dist\run1175007848\Boiler_New.jar using platform C:\Program Files\Java\jdk1.7.0_25/bin/java
  ***java.lang.RuntimeException: java.lang.reflect.InvocationTargetException***
  at javafx.fxml.FXMLLoader$ControllerMethodEventHandler.handle(FXMLLoader.java:1440)
  at com.sun.javafx.event.CompositeEventHandler.dispatchBubblingEvent(CompositeEventHandler.java:69)
  at  com.sun.javafx.event.EventHandlerManager.dispatchBubblingEvent(EventHandlerManager.java:217)
  at com.sun.javafx.event.EventHandlerManager.dispatchBubblingEvent(EventHandlerManager.java:170)
  at com.sun.javafx.event.CompositeEventDispatcher.dispatchBubblingEvent(CompositeEventDispatcher.java:38)
  at com.sun.javafx.event.BasicEventDispatcher.dispatchEvent(BasicEventDispatcher.java:37)
  at com.sun.javafx.event.EventDispatchChainImpl.dispatchEvent(EventDispatchChainImpl.java:92)
  at com.sun.javafx.event.BasicEventDispatcher.dispatchEvent(BasicEventDispatcher.java:35)
  at com.sun.javafx.event.EventDispatchChainImpl.dispatchEvent(EventDispatchChainImpl.java:92)
  at com.sun.javafx.event.EventUtil.fireEventImpl(EventUtil.java:53)
  at com.sun.javafx.event.EventUtil.fireEvent(EventUtil.java:28)
  at javafx.event.Event.fireEvent(Event.java:171)
  at javafx.scene.Node.fireEvent(Node.java:6863)
  at javafx.scene.control.Button.fire(Button.java:179)
  at com.sun.javafx.scene.control.behavior.ButtonBehavior.mouseReleased(ButtonBehavior.java:193)
  at com.sun.javafx.scene.control.skin.SkinBase$4.handle(SkinBase.java:336)
  at com.sun.javafx.scene.control.skin.SkinBase$4.handle(SkinBase.java:329)
  at com.sun.javafx.event.CompositeEventHandler.dispatchBubblingEvent(CompositeEventHandler.java:64)
  at com.sun.javafx.event.EventHandlerManager.dispatchBubblingEvent(EventHandlerManager.java:217)
  at com.sun.javafx.event.EventHandlerManager.dispatchBubblingEvent(EventHandlerManager.java:170)
  at com.sun.javafx.event.CompositeEventDispatcher.dispatchBubblingEvent(CompositeEventDispatcher.java:38)
  at com.sun.javafx.event.BasicEventDispatcher.dispatchEvent(BasicEventDispatcher.java:37)
  at com.sun.javafx.event.EventDispatchChainImpl.dispatchEvent(EventDispatchChainImpl.java:92)
  at com.sun.javafx.event.BasicEventDispatcher.dispatchEvent(BasicEventDispatcher.java:35)
  at com.sun.javafx.event.EventDispatchChainImpl.dispatchEvent(EventDispatchChainImpl.java:92)
  at com.sun.javafx.event.BasicEventDispatcher.dispatchEvent(BasicEventDispatcher.java:35)
  at com.sun.javafx.event.EventDispatchChainImpl.dispatchEvent(EventDispatchChainImpl.java:92)
  at com.sun.javafx.event.EventUtil.fireEventImpl(EventUtil.java:53)
  at com.sun.javafx.event.EventUtil.fireEvent(EventUtil.java:33)
  at javafx.event.Event.fireEvent(Event.java:171)
  at javafx.scene.Scene$MouseHandler.process(Scene.java:3328)
  at javafx.scene.Scene$MouseHandler.process(Scene.java:3168)
  at javafx.scene.Scene$MouseHandler.access$1900(Scene.java:3123)
  at javafx.scene.Scene.impl_processMouseEvent(Scene.java:1563)
  at javafx.scene.Scene$ScenePeerListener.mouseEvent(Scene.java:2265)
  at com.sun.javafx.tk.quantum.GlassViewEventHandler$MouseEventNotification.run(GlassViewEventHandler.java:250)
  at com.sun.javafx.tk.quantum.GlassViewEventHandler$MouseEventNotification.run(GlassViewEventHandler.java:173)
  at java.security.AccessController.doPrivileged(Native Method)
  at com.sun.javafx.tk.quantum.GlassViewEventHandler.handleMouseEvent(GlassViewEventHandler.java:292)
  at com.sun.glass.ui.View.handleMouseEvent(View.java:528)
  at com.sun.glass.ui.View.notifyMouse(View.java:922)
  at com.sun.glass.ui.win.WinApplication._runLoop(Native Method)
  at com.sun.glass.ui.win.WinApplication.access$100(WinApplication.java:29)
  at com.sun.glass.ui.win.WinApplication$3$1.run(WinApplication.java:73)
  at java.lang.Thread.run(Thread.java:724)
  ***Caused by: java.lang.reflect.InvocationTargetException***
  at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
  at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
  at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
  at java.lang.reflect.Method.invoke(Method.java:606)
  at sun.reflect.misc.Trampoline.invoke(MethodUtil.java:75)
  at sun.reflect.GeneratedMethodAccessor1.invoke(Unknown Source)
  at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
  at java.lang.reflect.Method.invoke(Method.java:606)
  at sun.reflect.misc.MethodUtil.invoke(MethodUtil.java:279)
  at javafx.fxml.FXMLLoader$ControllerMethodEventHandler.handle(FXMLLoader.java:1435)
  ... 44 more
  ***Caused by: java.lang.NullPointerException***
  at boiler_new.LoginController.login_act(LoginController.java:50)
  ... 54 more
  Exception in thread "JavaFX Application Thread" Deleting directory C:\Users\BlackWorld\Documents\NetBeansProjects\Boiler_New\dist\run1175007848
  </code></pre>
  
  <p>Please help me.</p>