Question

我一直在尝试开发一个小型的java应用程序。我正在使用JavaFX作为GUI。我正在使用带有e(fx)clipse插件的eclipse。一切都很好。我在eclipse中使用jdk1.7.0_60作为默认JRE。我决定尝试导出到一个可运行的.jar文件，这样我可以在没有eclipse的情况下测试我的应用程序。这是它出错的地方。

前段时间我在我的系统上安装了jre8和jdk1.8.0_05，用于测试目的。起初我不明白为什么我的应用程序在运行应用程序时一直给出运行时错误/异常，但这是因为我的默认java现在是8。

我将eclipse中的jdk从1.7改为1.8，并且在eclipse中给出了相同的错误/异常，所以我很确定它与我正在运行的jave8有关。（这两者之间的组合可能？）

这是我第一次使用JavaFX，因此可能只是配置错误。

我已尝试按照here的说明更改我的代码，但它仍无效。以下是一些屏幕截图和代码，可以更详细地解释：

Main.java

public class Main extends Application {

public static void main(String[] args) {
    Application.launch(Main.class, args);
}

@Override
public void start(Stage primaryStage) throws Exception {
    /*
    FXMLLoader fxmlLoader = new FXMLLoader(getClass().getResource("/fxml/gui/Launcher.fxml"));
    Parent root = (Parent) fxmlLoader.load();
    LauncherController controller = fxmlLoader.getController();
    controller.setStage(primaryStage);

    primaryStage.setTitle("The Deep Space Code");
    primaryStage.setScene(new Scene(root, 600, 400));
    primaryStage.setResizable(false);
    primaryStage.show();
    */
    Parent root;
    LauncherController controller;

    URL location = LauncherController.class.getResource("/fxml/gui/Launcher.fxml");
    FXMLLoader fxmlLoader = new FXMLLoader();
    fxmlLoader.setLocation(location);
    fxmlLoader.setBuilderFactory(new JavaFXBuilderFactory());

    try {
        root = (Parent) fxmlLoader.load(location.openStream());
        controller = (LauncherController) fxmlLoader.getController();
    } catch (IOException ioe) {
        throw new IllegalStateException(ioe);
    }

    primaryStage.setTitle("The Deep Space Code");
    primaryStage.setScene(new Scene(root, 600, 400));
    primaryStage.setResizable(false);
    primaryStage.show();
}



}

LauncherController.java

public class LauncherController {

@FXML
private static WebView WebView;
@FXML
private static ImageView LaunchImage;
@FXML
private static TextField FieldMail;
@FXML
private static PasswordField FieldPassword;
@FXML
private static CheckBox CheckBoxSave;
@FXML
private static Button BtnLogIn;

@FXML
private static Label lblEMail;
@FXML
private static Label lblPassword;
@FXML
private static Label lblWelcome;
@FXML
private static Label lblName;

private final static String website = "http://5.231.59.222/Secret/motd";
private static WebEngine webEngine;
private Stage stage;

private boolean configWrite;
private Config config;

private User user;
private String firstName;
private String lastName;
private String logged;
private long session;

public void setStage(Stage stage) {
    this.stage = stage;
}

public void initialize() {
    configWrite = false;
    webEngine = WebView.getEngine();
    webEngine.load(website);

    Platform.runLater(new Runnable() {
        @Override
        public void run() {
            FieldMail.requestFocus();
        }
    });

    // config GET
    config = ObjectPrinter.readConfig();
    if (config != null) {
        if (!config.getEmail().equals("")) {
            FieldMail.setText(config.getEmail());
            CheckBoxSave.setSelected(true);
            Platform.runLater(new Runnable() {
                @Override
                public void run() {
                    FieldPassword.requestFocus();
                }
            });
        }
    }
}

@FXML
protected void LogInButtonClicked(ActionEvent event) {
    //Removed code since this doens't matter and was 100+ lines long
}

@FXML
protected void SaveCheckBoxChanged(ActionEvent event) {
    configWrite = true;
}
}

Launcher.fxml

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

<?import javafx.scene.text.*?>
<?import javafx.scene.image.*?>
<?import javafx.scene.web.*?>
<?import javafx.scene.control.*?>
<?import java.lang.*?>
<?import javafx.scene.layout.*?>
        <TabPane maxHeight="1.7976931348623157E308" maxWidth="1.7976931348623157E308" prefHeight="400.0" prefWidth="600.0" tabClosingPolicy="UNAVAILABLE" xmlns="http://javafx.com/javafx/8" xmlns:fx="http://javafx.com/fxml/1" fx:controller="application.LauncherController">
        <tabs>
        <Tab text="Index">
          <content>
            <AnchorPane minHeight="0.0" minWidth="0.0" prefHeight="180.0" prefWidth="200.0">
                   <children>
                      <ImageView fx:id="LaunchImage" fitHeight="200.0" fitWidth="200.0" layoutX="400.0" layoutY="1.0" pickOnBounds="true" preserveRatio="true">
                         <image>
                            <Image url="@../../../recources/launcher.png" />
                         </image>
                      </ImageView>
                      <Label fx:id="lblEMail" layoutX="14.0" layoutY="244.0" text="E-Mail" />
                      <Label fx:id="lblPassword" layoutX="14.0" layoutY="281.0" text="Password" />
                      <TextField fx:id="FieldMail" layoutX="85.0" layoutY="240.0" prefColumnCount="16" promptText="E-Mail" />
                      <PasswordField fx:id="FieldPassword" layoutX="85.0" layoutY="277.0" prefColumnCount="16" promptText="Password" />
                      <CheckBox fx:id="CheckBoxSave" layoutX="85.0" layoutY="318.0" mnemonicParsing="false" onAction="#SaveCheckBoxChanged" text="Save E-Mail" />
                      <Button fx:id="BtnLogIn" layoutX="174.0" layoutY="310.0" mnemonicParsing="false" onAction="#LogInButtonClicked" prefHeight="27.0" prefWidth="105.0" text="LogIn" textAlignment="CENTER" textFill="BLUE" wrapText="true">
                         <font>
                            <Font name="Centaur" size="18.0" />
                         </font>
                      </Button>
                      <WebView fx:id="WebView" layoutX="-1.0" prefHeight="200.0" prefWidth="400.0" />
                      <Label fx:id="lblWelcome" layoutX="14.0" layoutY="244.0" text="Welcome to The Deep Space Code" visible="false" />
                      <Label fx:id="lblName" layoutX="14.0" layoutY="281.0" text="Currently logged in as " visible="false" />
                   </children></AnchorPane>
          </content>
        </Tab>
        <Tab text="Info">
          <content>
            <AnchorPane minHeight="0.0" minWidth="0.0" prefHeight="180.0" prefWidth="200.0" />
          </content>
        </Tab>
      </tabs>
    </TabPane>

http://i.stack.imgur.com/W3eJq.png（图书馆）

错误讯息：

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:367)
    at com.sun.javafx.application.LauncherImpl.launchApplication(LauncherImpl.java:305)
    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:894)
    at com.sun.javafx.application.LauncherImpl.access$000(LauncherImpl.java:56)
    at com.sun.javafx.application.LauncherImpl$1.run(LauncherImpl.java:158)
    at java.lang.Thread.run(Thread.java:745)
Caused by: java.lang.IllegalStateException: javafx.fxml.LoadException: 
/J:/Desktop/Game/Launcher/bin/fxml/gui/Launcher.fxml

    at application.Main.start(Main.java:46)
    at com.sun.javafx.application.LauncherImpl$8.run(LauncherImpl.java:837)
    at com.sun.javafx.application.PlatformImpl$7.run(PlatformImpl.java:335)
    at com.sun.javafx.application.PlatformImpl$6$1.run(PlatformImpl.java:301)
    at com.sun.javafx.application.PlatformImpl$6$1.run(PlatformImpl.java:298)
    at java.security.AccessController.doPrivileged(Native Method)
    at com.sun.javafx.application.PlatformImpl$6.run(PlatformImpl.java:298)
    at com.sun.glass.ui.InvokeLaterDispatcher$Future.run(InvokeLaterDispatcher.java:95)
    at com.sun.glass.ui.win.WinApplication._runLoop(Native Method)
    at com.sun.glass.ui.win.WinApplication.access$300(WinApplication.java:39)
    at com.sun.glass.ui.win.WinApplication$4$1.run(WinApplication.java:112)
    ... 1 more
Caused by: javafx.fxml.LoadException: 
/J:/Desktop/Game/Launcher/bin/fxml/gui/Launcher.fxml

    at javafx.fxml.FXMLLoader.constructLoadException(FXMLLoader.java:2617)
    at javafx.fxml.FXMLLoader.loadImpl(FXMLLoader.java:2587)
    at javafx.fxml.FXMLLoader.load(FXMLLoader.java:2425)
    at application.Main.start(Main.java:43)
    ... 11 more
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.loadImpl(FXMLLoader.java:2582)
    ... 13 more
Caused by: java.lang.NullPointerException
    at application.LauncherController.initialize(LauncherController.java:70)
    ... 23 more
Exception running application application.Main

Answer 1

看起来像静态字段不再填充我的FXMLLoader - 你为什么要使用静态变量呢？

使用jdk1.7时运行的Java + JavaFX应用程序，使用jdk1.8时出错

1 个答案: