Error All
Exception in thread "JavaFX Application Thread" java.lang.NullPointerException: Cannot invoke "javafx.scene.control.Label.setText(String)" because "this.as" is null
at com.gluonhq.samples.comments.views.ProfilePresenter.initData(ProfilePresenter.java:51)
at com.gluonhq.samples.comments.views.CommentsPresenter.lambda$initialize$3(CommentsPresenter.java:104)
at javafx.base@19/com.sun.javafx.event.CompositeEventHandler.dispatchBubblingEvent(CompositeEventHandler.java:86)
at javafx.base@19/com.sun.javafx.event.EventHandlerManager.dispatchBubblingEvent(EventHandlerManager.java:234)
at javafx.base@19/com.sun.javafx.event.EventHandlerManager.dispatchBubblingEvent(EventHandlerManager.java:191)
at javafx.base@19/com.sun.javafx.event.CompositeEventDispatcher.dispatchBubblingEvent(CompositeEventDispatcher.java:59)
at javafx.base@19/com.sun.javafx.event.BasicEventDispatcher.dispatchEvent(BasicEventDispatcher.java:58)
at javafx.base@19/com.sun.javafx.event.EventDispatchChainImpl.dispatchEvent(EventDispatchChainImpl.java:114)
at javafx.base@19/com.sun.javafx.event.BasicEventDispatcher.dispatchEvent(BasicEventDispatcher.java:56)
at javafx.base@19/com.sun.javafx.event.EventDispatchChainImpl.dispatchEvent(EventDispatchChainImpl.java:114)
at javafx.base@19/com.sun.javafx.event.BasicEventDispatcher.dispatchEvent(BasicEventDispatcher.java:56)
at javafx.base@19/com.sun.javafx.event.EventDispatchChainImpl.dispatchEvent(EventDispatchChainImpl.java:114)
at javafx.base@19/com.sun.javafx.event.BasicEventDispatcher.dispatchEvent(BasicEventDispatcher.java:56)
at javafx.base@19/com.sun.javafx.event.EventDispatchChainImpl.dispatchEvent(EventDispatchChainImpl.java:114)
at javafx.base@19/com.sun.javafx.event.EventUtil.fireEventImpl(EventUtil.java:74)
at javafx.base@19/com.sun.javafx.event.EventUtil.fireEvent(EventUtil.java:54)
at javafx.base@19/javafx.event.Event.fireEvent(Event.java:198)
at javafx.graphics@19/javafx.scene.Scene$ClickGenerator.postProcess(Scene.java:3599)
at javafx.graphics@19/javafx.scene.Scene$MouseHandler.process(Scene.java:3903)
at javafx.graphics@19/javafx.scene.Scene.processMouseEvent(Scene.java:1887)
at javafx.graphics@19/javafx.scene.Scene$ScenePeerListener.mouseEvent(Scene.java:2620)
at javafx.graphics@19/com.sun.javafx.tk.quantum.GlassViewEventHandler$MouseEventNotification.run(GlassViewEventHandler.java:411)
at javafx.graphics@19/com.sun.javafx.tk.quantum.GlassViewEventHandler$MouseEventNotification.run(GlassViewEventHandler.java:301)
at java.base/java.security.AccessController.doPrivileged(AccessController.java:399)
at javafx.graphics@19/com.sun.javafx.tk.quantum.GlassViewEventHandler.lambda$handleMouseEvent$2(GlassViewEventHandler.java:450)
at javafx.graphics@19/com.sun.javafx.tk.quantum.QuantumToolkit.runWithoutRenderLock(QuantumToolkit.java:424)
at javafx.graphics@19/com.sun.javafx.tk.quantum.GlassViewEventHandler.handleMouseEvent(GlassViewEventHandler.java:449)
at javafx.graphics@19/com.sun.glass.ui.View.handleMouseEvent(View.java:551)
at javafx.graphics@19/com.sun.glass.ui.View.notifyMouse(View.java:937)
at javafx.graphics@19/com.sun.glass.ui.mac.MacView.notifyMouse(MacView.java:127)
ProfilePresenter.java Here is my fxml controller and I'm fetching the information from the commentPresenter
package com.gluonhq.samples.comments.views;
import com.gluonhq.charm.glisten.animation.BounceInRightTransition;
import com.gluonhq.charm.glisten.application.AppManager;
import com.gluonhq.charm.glisten.control.AppBar;
import com.gluonhq.charm.glisten.control.ListTile;
import com.gluonhq.charm.glisten.mvc.View;
import com.gluonhq.charm.glisten.visual.MaterialDesignIcon;
import com.gluonhq.samples.comments.model.Comment;
import javafx.beans.binding.Bindings;
import javafx.fxml.FXML;
import javafx.scene.control.Button;
import javafx.scene.control.Label;
import javafx.scene.control.ListCell;
import javafx.scene.image.Image;
import javafx.scene.image.ImageView;
import javafx.scene.text.Text;
import java.awt.event.ActionEvent;
import java.awt.event.MouseEvent;
public class ProfilePresenter {
@FXML
protected View profile;
@FXML
private Label as;
@FXML
private ImageView jembatan;
@FXML
private Button back;
@FXML
private Label bridge;
private String data;
public void initData(Comment comment){
var listSel = comment;
String value = listSel.getAuthor();
as.setText(value);
}
public void setData(String name) {
data = name;
}
public void initialize() {
Image img = new Image("jembatan_1.jpeg");
jembatan.setImage(img);
profile.showingProperty().addListener((obs, oldValue, newValue) -> {
if (newValue) {
AppBar appBar = AppManager.getInstance().getAppBar();
appBar.setNavIcon(MaterialDesignIcon.ARROW_BACK.button(e ->
AppViewManager.COMMENTS_VIEW.switchView()));
appBar.setTitleText("Brigde Profile");
}
});
}
public void updateData(String content) {
bridge.setText(content);
}
}
CommentPresenter.java Here is my fxml controller and I'm fetching the information from the commentPresenter
/*
* Copyright (c) 2016, 2021, Gluon
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* * Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* * Neither the name of Gluon, any associated website, nor the
* names of its contributors may be used to endorse or promote products
* derived from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL GLUON BE LIABLE FOR ANY
* DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
package com.gluonhq.samples.comments.views;
import com.gluonhq.charm.glisten.application.AppManager;
import com.gluonhq.charm.glisten.control.AppBar;
import com.gluonhq.charm.glisten.control.FloatingActionButton;
import com.gluonhq.charm.glisten.mvc.View;
import com.gluonhq.charm.glisten.visual.MaterialDesignIcon;
import com.gluonhq.samples.comments.cloud.Service;
import com.gluonhq.samples.comments.model.Comment;
import javafx.event.EventHandler;
import javafx.fxml.FXML;
import javafx.fxml.FXMLLoader;
import javafx.scene.Parent;
import javafx.scene.Scene;
import javafx.scene.control.Label;
import javafx.scene.control.ListView;
import javafx.scene.input.MouseEvent;
import javafx.stage.Stage;
import javax.inject.Inject;
import java.io.IOException;
public class CommentsPresenter{
@Inject
protected Service service;
@FXML
protected View comments;
@FXML
protected ListView<Comment> commentsList;
public void initialize() {
comments.showingProperty().addListener((obs, oldValue, newValue) -> {
if (newValue) {
AppBar appBar = AppManager.getInstance().getAppBar();
appBar.setNavIcon(MaterialDesignIcon.MENU.button(e ->
AppManager.getInstance().getDrawer().open()));
appBar.setTitleText("List Bridge");
}
});
commentsList.setCellFactory(p -> new CommentListCell());
commentsList.setPlaceholder(new Label("There are no comments"));
commentsList.getItems().add(new Comment("1","Jembatan Merah", "Palembang Indonesia"));
commentsList.setOnMouseClicked(mouseEvent -> {
var myIndex = commentsList.getSelectionModel().getSelectedIndex();
var test = commentsList.getItems().get(myIndex);
ProfilePresenter profilePresenter = new ProfilePresenter();
profilePresenter.initData(commentsList.getSelectionModel().getSelectedItem());
AppViewManager.PROFILE_VIEW.switchView();
});
service.retrieveComments();
}
}
I conveyed information from the Comment Presenter to the Presenter Profile and then I wanted to setText my label but instead there was an error like the one above, but when it was printed in the console the data appeared. How to Fix It