应用程序启动方法中的异常-Javafx控件类

Question

I have already read all the old question, but I don´t understand what´s happened. The Problem come only when I try to connect the file layout.fxml with the control Class. I have try 1.000 path but it doesn´t work... I need your help, and sorry for the stupid question :(

error:

> 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:498)
    at com.sun.javafx.application.LauncherImpl.launchApplicationWithArgs(LauncherImpl.java:389)
    at com.sun.javafx.application.LauncherImpl.launchApplication(LauncherImpl.java:328)
    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:498)
    at sun.launcher.LauncherHelper$FXHelper.main(LauncherHelper.java:767)
Caused by: java.lang.RuntimeException: Exception in Application start method
    at com.sun.javafx.application.LauncherImpl.launchApplication1(LauncherImpl.java:917)
    at com.sun.javafx.application.LauncherImpl.lambda$launchApplication$155(LauncherImpl.java:182)
    at java.lang.Thread.run(Thread.java:745)
Caused by: java.io.FileNotFoundException: /Users/claudio/Documents/workspace/KlickiBunti/Layout.fxml (No such file or directory)
    at java.io.FileInputStream.open0(Native Method)
    at java.io.FileInputStream.open(FileInputStream.java:195)
    at java.io.FileInputStream.<init>(FileInputStream.java:138)
    at java.io.FileInputStream.<init>(FileInputStream.java:93)
    at sun.net.www.protocol.file.FileURLConnection.connect(FileURLConnection.java:90)
    at sun.net.www.protocol.file.FileURLConnection.getInputStream(FileURLConnection.java:188)
    at java.net.URL.openStream(URL.java:1045)
    at javafx.fxml.FXMLLoader.loadImpl(FXMLLoader.java:2440)
    at javafx.fxml.FXMLLoader.loadImpl(FXMLLoader.java:3214)
    at javafx.fxml.FXMLLoader.loadImpl(FXMLLoader.java:3175)
    at javafx.fxml.FXMLLoader.loadImpl(FXMLLoader.java:3148)
    at javafx.fxml.FXMLLoader.loadImpl(FXMLLoader.java:3124)
    at javafx.fxml.FXMLLoader.loadImpl(FXMLLoader.java:3104)
    at javafx.fxml.FXMLLoader.load(FXMLLoader.java:3097)
    at control.Main_Controller.start(Main_Controller.java:20)
    at com.sun.javafx.application.LauncherImpl.lambda$launchApplication1$162(LauncherImpl.java:863)
    at com.sun.javafx.application.PlatformImpl.lambda$runAndWait$175(PlatformImpl.java:326)
    at com.sun.javafx.application.PlatformImpl.lambda$null$173(PlatformImpl.java:295)
    at java.security.AccessController.doPrivileged(Native Method)
    at com.sun.javafx.application.PlatformImpl.lambda$runLater$174(PlatformImpl.java:294)
    at com.sun.glass.ui.InvokeLaterDispatcher$Future.run(InvokeLaterDispatcher.java:95)
Exception running application control.Main_Controller

Layout.fxml Class:

<?xml version="1.0" encoding="UTF-8"?>

<?import javafx.scene.control.*?>
<?import java.lang.*?>
<?import javafx.scene.layout.*?>
<?import javafx.scene.layout.AnchorPane?>


<AnchorPane prefHeight="386.0" prefWidth="354.0" xmlns:fx="http://javafx.com/fxml/1" xmlns="http://javafx.com/javafx/8" fx:controller="Controller.java">
   <children>
      <MenuBar AnchorPane.leftAnchor="0.0" AnchorPane.rightAnchor="0.0" AnchorPane.topAnchor="0.0">
        <menus>
          <Menu mnemonicParsing="false" text="File">
            <items>
              <MenuItem mnemonicParsing="false" text="Close" />
            </items>
          </Menu>
          <Menu mnemonicParsing="false" text="Edit">
            <items>
              <MenuItem mnemonicParsing="false" text="Delete" />
            </items>
          </Menu>
          <Menu mnemonicParsing="false" text="Help">
            <items>
              <MenuItem mnemonicParsing="false" text="About" />
            </items>
          </Menu>
        </menus>
      </MenuBar>
      <TextArea layoutX="14.0" layoutY="41.0" prefHeight="200.0" prefWidth="200.0" promptText="hey" />
   </children>
</AnchorPane>

Main Class:

package control;

import java.io.File;

import javafx.application.Application;
import javafx.scene.Scene;
import javafx.stage.Stage;
import javafx.fxml.FXMLLoader;
public class Main_Controller extends Application{

    public static void main(String[] args) {
        // TODO Auto-generated method stub
launch(args);
    }

    @Override
    public void start(Stage stage) throws Exception {
        // TODO Auto-generated method stub

        stage.setScene(new Scene(FXMLLoader.load(new File("Layout.fxml").toURI().toURL())));
        stage.show();

    }

}

Control Class:

package control;

public class Controller {

    Controller (){

        System.out.println("Try");

    }


}

The 3 Classes are in the same path.

Maybe is for you a stupid question, but I try since 6 hours to resolve my Problem -.-

Answer 1

The error message is pretty self-explanatory:

Caused by: java.io.FileNotFoundException: /Users/claudio/Documents/workspace/KlickiBunti/Layout.fxml (No such file or directory).

You should load the FXML file as a resource anyway: if (when) you bundle the application as a jar file, the FXML will not be an independent file on the file system anyway (and even if you don't, new File() resolves relative to the working directory, over which you have no control).

If the FXML file is in the same package as the class from which it is being loaded, you should do

stage.setScene(new Scene(FXMLLoader.load(getClass().getResource("Layout.fxml"))));

If it is in the same package as the controller class Controller , you could also do

stage.setScene(new Scene(FXMLLoader.load(Controller.class.getResource("Layout.fxml"))));

Additionally, the fx:controller attribute is expecting the fully qualified classname of the controller (ie package.ClassName ), not the Java source file (which is not even available at runtime, for obvious reasons).