Problem with java.lang.IllegalStateException: Cannot set modality once stage has been set visible

[Ertan Hasani]

Hello guys , im having an issue : when i click a menuItem it shows a window who says that "are you sure you want to logout" , and i click no (so that window is closed), but when i click again i that menuItem it shows me java.lang.IllegalStateException: Cannot set modality once stage has been set visible.

What should I do ?

Here's the code:

MainWindowController.java

public class MainWindowController {

    static Stage logoutStage = new Stage();
    
    @FXML
    private void initialize()
    {
        
    }
    
    @FXML
    public void logoutWindow() throws IOException
    {
        FXMLLoader loader = new FXMLLoader();
        loader.setLocation(getClass().getResource("LogoutFXML.fxml"));
        BorderPane border = loader.load();
        Scene scene = new Scene(border);
        logoutStage.setScene(scene);
        logoutStage.setTitle("Pit Stop - Logout");
        logoutStage.initModality(Modality.WINDOW_MODAL);
        logoutStage.initOwner(MainFXMLController.mainFXMLStage);
        logoutStage.showAndWait();
      }

Here's the method to close that window if user click "NO" i dont want to logout

@FXML
    private void noBtn()
    {
        MainWindowController.logoutStage.close();
    }

OUTPUT:

Exception in thread "JavaFX Application Thread" java.lang.RuntimeException: java.lang.reflect.InvocationTargetException
	at javafx.fxml.FXMLLoader$MethodHandler.invoke(FXMLLoader.java:1762)
	at javafx.fxml.FXMLLoader$ControllerMethodEventHandler.handle(FXMLLoader.java:1645)
	at com.sun.javafx.event.CompositeEventHandler.dispatchBubblingEvent(CompositeEventHandler.java:86)
	at com.sun.javafx.event.EventHandlerManager.dispatchBubblingEvent(EventHandlerManager.java:238)
	at com.sun.javafx.event.EventHandlerManager.dispatchBubblingEvent(EventHandlerManager.java:191)
	at com.sun.javafx.event.BasicEventDispatcher.dispatchEvent(BasicEventDispatcher.java:58)
	at com.sun.javafx.event.EventDispatchChainImpl.dispatchEvent(EventDispatchChainImpl.java:114)
	at com.sun.javafx.event.EventUtil.fireEventImpl(EventUtil.java:74)
	at com.sun.javafx.event.EventUtil.fireEvent(EventUtil.java:49)
	at javafx.event.Event.fireEvent(Event.java:198)
	at javafx.scene.control.MenuItem.fire(MenuItem.java:462)
	at com.sun.javafx.scene.control.skin.ContextMenuContent$MenuItemContainer.doSelect(ContextMenuContent.java:1364)
	at com.sun.javafx.scene.control.skin.ContextMenuContent$MenuItemContainer.lambda$createChildren$324(ContextMenuContent.java:1317)
	at com.sun.javafx.scene.control.skin.ContextMenuContent$MenuItemContainer$$Lambda$231/7286030.handle(Unknown Source)
	at com.sun.javafx.event.CompositeEventHandler$NormalEventHandlerRecord.handleBubblingEvent(CompositeEventHandler.java:218)
	at com.sun.javafx.event.CompositeEventHandler.dispatchBubblingEvent(CompositeEventHandler.java:80)
	at com.sun.javafx.event.EventHandlerManager.dispatchBubblingEvent(EventHandlerManager.java:238)
	at com.sun.javafx.event.EventHandlerManager.dispatchBubblingEvent(EventHandlerManager.java:191)
	at com.sun.javafx.event.CompositeEventDispatcher.dispatchBubblingEvent(CompositeEventDispatcher.java:59)
	at com.sun.javafx.event.BasicEventDispatcher.dispatchEvent(BasicEventDispatcher.java:58)
	at com.sun.javafx.event.EventDispatchChainImpl.dispatchEvent(EventDispatchChainImpl.java:114)
	at com.sun.javafx.event.BasicEventDispatcher.dispatchEvent(BasicEventDispatcher.java:56)
	at com.sun.javafx.event.EventDispatchChainImpl.dispatchEvent(EventDispatchChainImpl.java:114)
	at com.sun.javafx.event.BasicEventDispatcher.dispatchEvent(BasicEventDispatcher.java:56)
	at com.sun.javafx.event.EventDispatchChainImpl.dispatchEvent(EventDispatchChainImpl.java:114)
	at com.sun.javafx.event.BasicEventDispatcher.dispatchEvent(BasicEventDispatcher.java:56)
	at com.sun.javafx.event.EventDispatchChainImpl.dispatchEvent(EventDispatchChainImpl.java:114)
	at com.sun.javafx.event.EventUtil.fireEventImpl(EventUtil.java:74)
	at com.sun.javafx.event.EventUtil.fireEvent(EventUtil.java:54)
	at javafx.event.Event.fireEvent(Event.java:198)
	at javafx.scene.Scene$MouseHandler.process(Scene.java:3724)
	at javafx.scene.Scene$MouseHandler.access$1500(Scene.java:3452)
	at javafx.scene.Scene.impl_processMouseEvent(Scene.java:1728)
	at javafx.scene.Scene$ScenePeerListener.mouseEvent(Scene.java:2461)
	at com.sun.javafx.tk.quantum.GlassViewEventHandler$MouseEventNotification.run(GlassViewEventHandler.java:348)
	at com.sun.javafx.tk.quantum.GlassViewEventHandler$MouseEventNotification.run(GlassViewEventHandler.java:273)
	at java.security.AccessController.doPrivileged(Native Method)
	at com.sun.javafx.tk.quantum.GlassViewEventHandler.handleMouseEvent(GlassViewEventHandler.java:382)
	at com.sun.glass.ui.View.handleMouseEvent(View.java:553)
	at com.sun.glass.ui.View.notifyMouse(View.java:925)
	at com.sun.glass.ui.win.WinApplication._runLoop(Native Method)
	at com.sun.glass.ui.win.WinApplication.lambda$null$141(WinApplication.java:102)
	at com.sun.glass.ui.win.WinApplication$$Lambda$37/29531133.run(Unknown Source)
	at java.lang.Thread.run(Thread.java:745)
Caused by: java.lang.reflect.InvocationTargetException
	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
	at java.lang.reflect.Method.invoke(Method.java:483)
	at sun.reflect.misc.Trampoline.invoke(MethodUtil.java:71)
	at sun.reflect.GeneratedMethodAccessor1.invoke(Unknown Source)
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
	at java.lang.reflect.Method.invoke(Method.java:483)
	at sun.reflect.misc.MethodUtil.invoke(MethodUtil.java:275)
	at javafx.fxml.FXMLLoader$MethodHandler.invoke(FXMLLoader.java:1759)
	... 43 more
Caused by: java.lang.IllegalStateException: Cannot set modality once stage has been set visible
	at javafx.stage.Stage.initModality(Stage.java:513)
	at main.MainWindowController.logoutWindow(MainWindowController.java:43)
	... 53 more

MainWindowController.java.43 line is this one:

logoutStage.initModality(Modality.WINDOW_MODAL);

[Ertan Hasani]

All i needed to do was to split setup(initialize) and control (logoutWindow) :

@FXML
private void initialize() {
    FXMLLoader loader = new FXMLLoader();
    loader.setLocation(getClass().getResource("LogoutFXML.fxml"));
    BorderPane border = loader.load();
    Scene scene = new Scene(border);
    logoutStage.setScene(scene);
    logoutStage.setTitle("Pit Stop - Logout");
    logoutStage.initModality(Modality.WINDOW_MODAL);
    logoutStage.initOwner(MainFXMLController.mainFXMLStage);
}

@FXML
public void logoutWindow() throws IOException {
    logoutStage.showAndWait();
}