JavaFX+；弹簧靴&x2B；JPA-NullPointerException

我对iConnected存储库的任何操作都有问题

Exception in thread "JavaFX Application Thread" java.lang.RuntimeException:  java.lang.reflect.InvocationTargetException
    at javafx.fxml.FXMLLoader$MethodHandler.invoke(FXMLLoader.java:1774)
    at javafx.fxml.FXMLLoader$ControllerMethodEventHandler.handle(FXMLLoader.java:1657)
    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.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.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.Node.fireEvent(Node.java:8413)
    at javafx.scene.control.Button.fire(Button.java:185)
    at com.sun.javafx.scene.control.behavior.ButtonBehavior.mouseReleased(ButtonBehavior.java:182)
    at com.sun.javafx.scene.control.skin.BehaviorSkinBase$1.handle(BehaviorSkinBase.java:96)
    at com.sun.javafx.scene.control.skin.BehaviorSkinBase$1.handle(BehaviorSkinBase.java:89)
    at com.sun.javafx.event.CompositeEventHandler$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.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$MouseHandler.process(Scene.java:3757)
    at javafx.scene.Scene$MouseHandler.access$1500(Scene.java:3485)
    at javafx.scene.Scene.impl_processMouseEvent(Scene.java:1762)
    at javafx.scene.Scene$ScenePeerListener.mouseEvent(Scene.java:2494)
    at com.sun.javafx.tk.quantum.GlassViewEventHandler$MouseEventNotification.run(GlassViewEventHandler.java:381)
    at com.sun.javafx.tk.quantum.GlassViewEventHandler$MouseEventNotification.run(GlassViewEventHandler.java:295)
    at java.security.AccessController.doPrivileged(Native Method)
    at com.sun.javafx.tk.quantum.GlassViewEventHandler.lambda$handleMouseEvent$354(GlassViewEventHandler.java:417)
    at com.sun.javafx.tk.quantum.QuantumToolkit.runWithoutRenderLock(QuantumToolkit.java:389)
    at com.sun.javafx.tk.quantum.GlassViewEventHandler.handleMouseEvent(GlassViewEventHandler.java:416)
    at com.sun.glass.ui.View.handleMouseEvent(View.java:555)
    at com.sun.glass.ui.View.notifyMouse(View.java:937)
    at com.sun.glass.ui.win.WinApplication._runLoop(Native Method)
    at com.sun.glass.ui.win.WinApplication.lambda$null$148(WinApplication.java:191)
    at java.lang.Thread.run(Thread.java:748)
 Caused by:
 java.lang.reflect.InvocationTargetException
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.lang.reflect.Method.invoke(Method.java:498)
    at sun.reflect.misc.Trampoline.invoke(MethodUtil.java:71)
    at sun.reflect.GeneratedMethodAccessor21.invoke(Unknown Source)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.lang.reflect.Method.invoke(Method.java:498)
    at sun.reflect.misc.MethodUtil.invoke(MethodUtil.java:275)
    at javafx.fxml.FXMLLoader$MethodHandler.invoke(FXMLLoader.java:1769)
    ... 48 more
 Caused by: java.lang.NullPointerException
    at pl.com.jg.serviceapp.controllers.ReportFrameController.generateButtonClicked(ReportFrameController.java:54)
    ... 58 more

My

ReportFrameController

（使用故障报告）：

另一个回购操作正常：

@Controller
public class MainFrameController {

    @FXML
    public Button connectButton;

    @FXML
    private PasswordField passwordBox;

    @FXML
    private TextField usernameBox;

    @FXML
    private Label answerLb;

    @Autowired
    UserController userController;

    @FXML
    void connectClicked(ActionEvent event) throws Exception {
        String login;
        String password;
        String answer;

        login = usernameBox.getText();
        password = MD5(passwordBox.getText());

        answer = userController.auth(login, password);
        answerLb.setText(answer);

        if (answer.equals("ok")) {
            try {
                Parent root = FXMLLoader.load(getClass().getResource("/fxml/menuFrame.fxml"));
                Scene scene = new Scene(root);
                Stage stage = (Stage) connectButton.getScene().getWindow();
                stage.hide();
                stage.setTitle("Logged in as: " + login);
                stage.setScene(scene);
                stage.show();

            } catch (IOException e) {
                System.out.println("Failed to create new Window.");
            }

        }
    }


    public String MD5(String s) throws Exception{

        MessageDigest m=MessageDigest.getInstance("MD5");
        m.update(s.getBytes(),0,s.length());
        String pass = new BigInteger(1,m.digest()).toString(16);
        return(pass);
    }

这两种回购都有合适的模式。数据库中的实体有几个条目。 还需要别的吗

编辑。 添加主类：

@SpringBootApplication
@EnableAutoConfiguration
@ComponentScan(basePackages = {"pl.com.jg.serviceapp.controllers",
    "pl.com.jg.serviceapp.services"})
@EntityScan("pl.com.jg.serviceapp.models")
@EnableJpaRepositories(basePackages = {"pl.com.jg.serviceapp.repositories"})
public class ServiceappApplication extends Application{

private ConfigurableApplicationContext springContext;
private Parent rootNode;

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

@Override
public void init() throws Exception {
    springContext = SpringApplication.run(ServiceappApplication.class);
    FXMLLoader fxmlLoader = new FXMLLoader(getClass().getResource("/fxml/mainFrame.fxml"));
    fxmlLoader.setControllerFactory(springContext::getBean);
    rootNode = fxmlLoader.load();
}

@Override
public void start(Stage stage) throws Exception {
    stage.setScene(new Scene(rootNode));
    stage.setTitle("SERVICEAPP");
    stage.show();
}

@Override
public void stop() throws Exception {
    springContext.close();
}


}

编辑：

添加菜单框架控制器：

@Controller
public class MenuFrameController {

@FXML
private Button generateReportButton;



@FXML
void generateReportButtonClicked(ActionEvent event) throws Exception {

        try {
            Parent root = FXMLLoader.load(getClass().getResource("/fxml/reportFrame.fxml"));
            Scene scene = new Scene(root);
            Stage stage = (Stage) generateReportButton.getScene().getWindow();
            stage.setTitle("Generate new report");
            stage.setScene(scene);
            stage.show();
        } catch (IOException e) {
            System.out.println("Failed to create Generate Window.");
        }



    }

}

---

加载

reportFrame.fxml

时，您没有在

fxmloader

上设置控制器工厂。因此，当

fxmloader

需要

ReportFrameController

的实例时，它只是直接实例化一个实例，而不是从Spring应用程序上下文中获取一个实例。由于spring没有管理控制器，因此无法向其中注入任何内容

只需使用与加载大型机.fxml相同的模式加载

reportFrame.fxml

。您可以将

ApplicationContext

本身注入控制器，以便执行此操作。请注意，这意味着您的

MenuFrameController

也必须是spring管理的（因此，在加载相应的FXML文件等时使用相同的技术）

另外，您应该制作所有的控制器原型，因为每次加载相同的FXML文件时，您都需要控制器的一个新实例

@Controller
@Scope("prototype")
public class MenuFrameController {

@FXML
private Button generateReportButton;

@Autowired
private ApplicationContext springContext ;

@FXML
void generateReportButtonClicked(ActionEvent event) throws Exception {

        try {
            FXMLLoader fxmlLoader = new FXMLLoader(getClass().getResource("/fxml/reportFrame.fxml"));
            fxmlLoader.setControllerFactory(springContext::getBean);
            Parent root = fxmlLoader.load();
            Scene scene = new Scene(root);
            Stage stage = (Stage) generateReportButton.getScene().getWindow();
            stage.setTitle("Generate new report");
            stage.setScene(scene);
            stage.show();
        } catch (IOException e) {
            System.out.println("Failed to create Generate Window.");
        }



    }

}

---

如果愿意，您可以通过创建一个封装加载功能的类来减少重复代码，并在任何需要的地方插入该类的实例：

public class SpringFXMLLoader {

    @Autowired
    private ApplicationContext springContext ;

    public Parent load(String resourceName) throws IOException {
        FXMLLoader loader = new FXMLLoader(getClass().getResource(resourceName));
        loader.setControllerFactory(springContext::getBean);
        return loader.load();
    }
}

那么你的主课就可以了

@Override
public void init() throws Exception {
    springContext = SpringApplication.run(ServiceappApplication.class);
    rootNode = springContext.getBean(SpringFXMLLoader.class).load("/fxml/mainFrame.fxml");
}

而您的

菜单框架控制器

将（稍微）简化为

---

加载

reportFrame.fxml

时，您没有在

fxmloader

上设置控制器工厂。因此，当

fxmloader

需要

ReportFrameController

的实例时，它只是直接实例化一个实例，而不是从Spring应用程序上下文中获取一个实例。由于spring没有管理控制器，因此无法向其中注入任何内容

只需使用与加载大型机.fxml相同的模式加载

reportFrame.fxml

。您可以将

ApplicationContext

本身注入控制器，以便执行此操作。请注意，这意味着您的

MenuFrameController

也必须是spring管理的（因此，在加载相应的FXML文件等时使用相同的技术）

另外，您应该制作所有的控制器原型，因为每次加载相同的FXML文件时，您都需要控制器的一个新实例

@Controller
@Scope("prototype")
public class MenuFrameController {

@FXML
private Button generateReportButton;

@Autowired
private ApplicationContext springContext ;

@FXML
void generateReportButtonClicked(ActionEvent event) throws Exception {

        try {
            FXMLLoader fxmlLoader = new FXMLLoader(getClass().getResource("/fxml/reportFrame.fxml"));
            fxmlLoader.setControllerFactory(springContext::getBean);
            Parent root = fxmlLoader.load();
            Scene scene = new Scene(root);
            Stage stage = (Stage) generateReportButton.getScene().getWindow();
            stage.setTitle("Generate new report");
            stage.setScene(scene);
            stage.show();
        } catch (IOException e) {
            System.out.println("Failed to create Generate Window.");
        }



    }

}

---

如果愿意，您可以通过创建一个封装加载功能的类来减少重复代码，并在任何需要的地方插入该类的实例：

public class SpringFXMLLoader {

    @Autowired
    private ApplicationContext springContext ;

    public Parent load(String resourceName) throws IOException {
        FXMLLoader loader = new FXMLLoader(getClass().getResource(resourceName));
        loader.setControllerFactory(springContext::getBean);
        return loader.load();
    }
}

那么你的主课就可以了

@Override
public void init() throws Exception {
    springContext = SpringApplication.run(ServiceappApplication.class);
    rootNode = springContext.getBean(SpringFXMLLoader.class).load("/fxml/mainFrame.fxml");
}

而您的

菜单框架控制器

将（稍微）简化为

---

NullPointerException非常清楚。这是ReportFrameController.java:54，具体是哪一行？您如何确保控制器是spring管理的bean？第54行：for（关键字i:keywordRepository.findAll（））{//InteliJ建议在这一行上出现问题编辑。添加了mainClass，但主类仅加载

mainFrame.fxml

（我假设

MainFrameController

是该FXML文件的控制器类）。您在哪里加载使用

ReportFrameController

的FXML？NullPointerException非常清楚。它在ReportFrameController.java:54中，具体是哪一行？您如何确保控制器是spring管理的bean？第54行：for（关键字i:keywordRepository.findAll（））{//InteliJ建议在这行编辑上出现问题。添加了mainClass，但main类只加载

大型机。fxml

（我假设

MainFrameController

是该fxml文件的控制器类）。您在哪里加载使用

ReportFrameController

的fxml？