java.lang.RuntimeException: java.lang.reflect.InvocationTargetException


Question

I get a NullPointerException when I run the following program. Please note that I'm using Hibernate.

I can't figure out how to fix the Null Pointer error. This is the error:

Caused by: java.lang.NullPointerException
    at wakiliproject.SampleController.setSettersLose(SampleController.java:22)

The KIWI_TABLE is created in the database by this class:

import java.io.Serializable;
import javax.persistence.Entity;
import javax.persistence.GeneratedValue;
import javax.persistence.Id;

@Entity(name = "KIWI_TABLE")
public class NewBeautifulKiwi implements Serializable {

    @Id
    @GeneratedValue
    private int KiwiId;
    private String Kiwi;

    public int getKiwiId() {
        return KiwiId;
    }

    public void setKiwiId(int KiwiId) {
        this.KiwiId = KiwiId;
    }

    public String getKiwi() {
        return Kiwi;
    }

    public void setKiwi(String Kiwi) {
        this.Kiwi = Kiwi;
    }
}

This is how I call the NewBeautifulKiwi to persist items into the table 'KIWI_TABLE': (partial extract of the class)

public class SampleController implements Initializable, ControlledScreen {

    @FXML
    TextField KIWITextField;

    @FXML
    public void setSettersLose () {
        NewBeautifulKiwi newBeautifulKiwi = new NewBeautifulKiwi();
        newBeautifulKiwi.setKiwi(KIWITextField.getText());

        SessionFactory sessionFactory = new Configuration().configure().buildSessionFactory();
        Session session = sessionFactory.openSession();
        session.beginTransaction();
        session.save(newBeautifulKiwi);
        session.getTransaction().commit();
    }

More of the error:

java.lang.RuntimeException: java.lang.reflect.InvocationTargetException
    at javafx.fxml.FXMLLoader$ControllerMethodEventHandler.handle(FXMLLoader.java:1449)
    at com.sun.javafx.event.CompositeEventHandler.dispatchBubblingEvent(CompositeEventHandler.java:69)
    at com.sun.javafx.event.EventHandlerManager.dispatchBubblingEvent(EventHandlerManager.java:217)
    at com.sun.javafx.event.EventHandlerManager.dispatchBubblingEvent(EventHandlerManager.java:170)
    at com.sun.javafx.event.CompositeEventDispatcher.dispatchBubblingEvent(CompositeEventDispatcher.java:38)
    at com.sun.javafx.event.BasicEventDispatcher.dispatchEvent(BasicEventDispatcher.java:37)
    at com.sun.javafx.event.EventDispatchChainImpl.dispatchEvent(EventDispatchChainImpl.java:92)
    at com.sun.javafx.event.BasicEventDispatcher.dispatchEvent(BasicEventDispatcher.java:35)
    at com.sun.javafx.event.EventDispatchChainImpl.dispatchEvent(EventDispatchChainImpl.java:92)
    at com.sun.javafx.event.BasicEventDispatcher.dispatchEvent(BasicEventDispatcher.java:35)
    at com.sun.javafx.event.EventDispatchChainImpl.dispatchEvent(EventDispatchChainImpl.java:92)
    at com.sun.javafx.event.EventUtil.fireEventImpl(EventUtil.java:53)
    at com.sun.javafx.event.EventUtil.fireEvent(EventUtil.java:33)
    at javafx.event.Event.fireEvent(Event.java:171)
    at javafx.scene.Scene$ClickGenerator.postProcess(Scene.java:3100)
    at javafx.scene.Scene$ClickGenerator.access$8600(Scene.java:3038)
    at javafx.scene.Scene$MouseHandler.process(Scene.java:3320)
    at javafx.scene.Scene$MouseHandler.process(Scene.java:3151)
    at javafx.scene.Scene$MouseHandler.access$1900(Scene.java:3106)
    at javafx.scene.Scene.impl_processMouseEvent(Scene.java:1563)
    at javafx.scene.Scene$ScenePeerListener.mouseEvent(Scene.java:2248)
    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:530)
    at com.sun.glass.ui.View.notifyMouse(View.java:924)
    at com.sun.glass.ui.win.WinApplication._runLoop(Native Method)
    at com.sun.glass.ui.win.WinApplication.access$100(WinApplication.java:17)
    at com.sun.glass.ui.win.WinApplication$3$1.run(WinApplication.java:67)
    at java.lang.Thread.run(Thread.java:744)
Caused by: java.lang.reflect.InvocationTargetException
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.lang.reflect.Method.invoke(Method.java:606)
    at sun.reflect.misc.Trampoline.invoke(MethodUtil.java:75)
    at sun.reflect.GeneratedMethodAccessor1.invoke(Unknown Source)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.lang.reflect.Method.invoke(Method.java:606)
    at sun.reflect.misc.MethodUtil.invoke(MethodUtil.java:279)
    at javafx.fxml.FXMLLoader$ControllerMethodEventHandler.handle(FXMLLoader.java:1446)
    ... 30 more
Caused by: java.lang.NullPointerException
    at wakiliproject.SampleController.setSettersLose(SampleController.java:23)
    ... 40 more

Thank you in advance.

EDIT: The SampleController Class with everything else:

import java.net.URL;
import java.util.ResourceBundle;
import javafx.application.Platform;
import javafx.fxml.FXML;
import javafx.fxml.Initializable;
import javafx.scene.control.TextField;
import javafx.scene.layout.Pane;
import org.hibernate.Session;
import org.hibernate.SessionFactory;
import org.hibernate.cfg.Configuration;
import wakiliproject.Forms.AddNew.DB.NewBeautifulKiwi;

public class SampleController implements Initializable, ControlledScreen {

    @FXML
    TextField KIWITextField = null;

    @FXML
    public void setSettersLose () {
        NewBeautifulKiwi newBeautifulKiwi = new NewBeautifulKiwi();
        newBeautifulKiwi.setKiwi(KIWITextField.getText());

        SessionFactory sessionFactory = new Configuration().configure().buildSessionFactory();
        Session session = sessionFactory.openSession();
        session.beginTransaction();
        session.save(newBeautifulKiwi);
        session.getTransaction().commit();
    }   

    ScreensController myController;

    // Initializes the controller class.
    @Override
    public void initialize(URL url, ResourceBundle rb) {
        // TODO
    }

    @Override
    public void setScreenParent(ScreensController screenParent) {
        myController = screenParent;
    }

    @FXML
    public void windowClose() {
        Platform.exit();
    }

    // Pages
    @FXML
    private void goToClients() {
        myController.setScreen(WakiliProject.clientsID);
    }

    @FXML
    private void goToMatters() {
        myController.setScreen(WakiliProject.mattersID);
    }

    @FXML
    private void goToEvents() {
        myController.setScreen(WakiliProject.eventsID);
    }

    @FXML
    private void goToFirmProfileView() {
        myController.setScreen(WakiliProject.firmProfileID);
    }

    // Hover menus
    @FXML
    Pane clientAccountsHoverMenu;

    @FXML
    private void clientAccountsHover() {
        clientAccountsHoverMenu.setVisible(true);
    }

    @FXML
    private void clientAccountsHoverOut() {
        clientAccountsHoverMenu.setVisible(false);
    }

    // Hidden Panes
    @FXML
    Pane notesHomePane;

    @FXML
    Pane navItems;

    @FXML
    Pane mainHome;

    @FXML
    Pane homeContentDisplay;

    @FXML
    private void notesHomePaneShow() {
        notesHomePane.setVisible(true);
        mainHome.setVisible(false);
    }

    @FXML
    private void goToHome() {
        notesHomePane.setVisible(false);
        mainHome.setVisible(true);
    }

    @FXML
    private void navItemsShow() {
        navItems.setVisible(true);
        homeContentDisplay.setVisible(false);
    }

    @FXML
    private void goToHomeFronNavAll() {
        navItems.setVisible(false);
        homeContentDisplay.setVisible(true);
    }
}
1
0
1/16/2014 4:53:13 AM

Accepted Answer

So since the line of interest is newBeautifulKiwi.setKiwi(KIWITextField.getText()); and taking into account that newBeautifulKiwi can never be null (it has just been created using default constructor) it's KIWITextField that is null and thus not inject properly. make sure the id of this element in .fxml file exactly matches this field's name (I'd made it private).

Most probable cause is setSettersLose annotated with @FXML. Check the similar thread.

2
5/23/2017 11:50:53 AM

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