[英]JavaFX open new window issue with fxml
I'm developing a password manager program. 我正在开发一个密码管理器程序。 When opening a new window in this program it throws an exception on the
addEntry()
mouse click event. 在此程序中打开新窗口时,它将在
addEntry()
鼠标单击事件上引发异常。 I have a Main
class that opens the main window (with sample.fxml
) and a Controller
class that manages to open the new window (with addNewEntryDialog.fxml
). 我有一个
Main
类,它打开主窗口(带有sample.fxml
),还有一个Controller
类,它设法打开新窗口(带有addNewEntryDialog.fxml
)。 Here's my code: 这是我的代码:
Main.java Main.java
package sample;
import javafx.application.Application;
import javafx.fxml.FXML;
import javafx.fxml.FXMLLoader;
import javafx.scene.Parent;
import javafx.scene.Scene;
import javafx.stage.Modality;
import javafx.stage.Stage;
import java.io.IOException;
public class Main extends Application {
@Override
public void start(Stage primaryStage) throws Exception{
Parent root = FXMLLoader.load(getClass().getResource("/sample.fxml"));
primaryStage.setTitle("Password Manager");
primaryStage.setScene(new Scene(root, 800, 600));
primaryStage.show();
}
public static void main(String[] args) {
launch(args);
}
}
Controller.java Controller.java
package sample;
import javafx.collections.FXCollections;
import javafx.collections.ObservableList;
import javafx.fxml.FXML;
import javafx.fxml.FXMLLoader;
import javafx.fxml.Initializable;
import javafx.scene.Parent;
import javafx.scene.Scene;
import javafx.scene.control.*;
import javafx.scene.control.cell.PropertyValueFactory;
import javafx.stage.Stage;
import javafx.stage.StageStyle;
import java.io.IOException;
import java.net.URL;
import java.sql.*;
import java.util.ResourceBundle;
public class Controller implements Initializable {
public ObservableList<Data> data;
public TableView dbTable;
public TableColumn siteColumn, usernameColumn, passwordColumn;
public ToggleButton showPasswordToggle;
@Override
public void initialize(URL location, ResourceBundle resources) {
fillTable();
}
public void fillTable(){
data = FXCollections.observableArrayList();
String query = "SELECT * FROM accounts";
try {
Connection connection = connectToDatabase();
ResultSet resultSet = connection.createStatement().executeQuery(query);
while (resultSet.next()) {
data.add(new Data(resultSet.getString(1), resultSet.getString(2), resultSet.getString(3)));
}
siteColumn.setCellValueFactory(new PropertyValueFactory("site"));
usernameColumn.setCellValueFactory(new PropertyValueFactory("username"));
passwordColumn.setCellValueFactory(new PropertyValueFactory("password"));
dbTable.setItems(data);
} catch (SQLException e) {
e.printStackTrace();
}
}
@FXML
public void addEntry() throws IOException {
Stage stage = new Stage();
Parent root = FXMLLoader.load(getClass().getResource("/addEntryDialog.fxml"));
stage.setTitle("Add new entry");
stage.setScene(new Scene(root, 800, 600));
stage.show();
}
addEntryDialog.fxml addEntryDialog.fxml
<?xml version="1.0" encoding="UTF-8"?>
<?import javafx.scene.*?>
<?import javafx.scene.control.*?>
<?import java.lang.*?>
<?import javafx.scene.layout.*?>
<Pane maxHeight="-Infinity" maxWidth="-Infinity" minHeight="-Infinity" minWidth="-Infinity" prefHeight="200.0" prefWidth="400.0" xmlns="http://javafx.com/javafx/8" xmlns:fx="http://javafx.com/fxml/1" fx:controller="sample.Controller">
<children>
<GridPane layoutX="28.0" layoutY="21.0" prefHeight="123.0" prefWidth="317.0">
<columnConstraints>
<ColumnConstraints hgrow="SOMETIMES" minWidth="10.0" />
<ColumnConstraints hgrow="SOMETIMES" minWidth="10.0" />
</columnConstraints>
<rowConstraints>
<RowConstraints minHeight="10.0" vgrow="SOMETIMES" />
<RowConstraints minHeight="10.0" vgrow="SOMETIMES" />
<RowConstraints minHeight="10.0" vgrow="SOMETIMES" />
</rowConstraints>
<children>
<Label layoutX="33.0" layoutY="26.0" text="Site:" />
<Label layoutX="28.0" layoutY="78.0" text="Username:" GridPane.rowIndex="1" />
<Label layoutX="44.0" layoutY="135.0" text="Password:" GridPane.rowIndex="2" />
<TextField fx:id="siteField" layoutX="150.0" layoutY="21.0" GridPane.columnIndex="1" />
<TextField fx:id="usernameField" layoutX="150.0" layoutY="73.0" GridPane.columnIndex="1" GridPane.rowIndex="1" />
<PasswordField fx:id="passwordField" layoutX="150.0" layoutY="123.0" GridPane.columnIndex="1" GridPane.rowIndex="2" />
</children>
</GridPane>
<Button layoutX="327.0" layoutY="163.0" mnemonicParsing="false" text="OK" />
<Button layoutX="246.0" layoutY="163.0" mnemonicParsing="false" text="Cancel" />
</children>
</Pane>
sample.fxml sample.fxml
<?xml version="1.0" encoding="UTF-8"?>
<?import javafx.scene.control.*?>
<?import java.lang.*?>
<?import javafx.scene.layout.*?>
<?import javafx.geometry.Insets?>
<?import javafx.scene.layout.GridPane?>
<?import javafx.scene.control.Button?>
<?import javafx.scene.control.Label?>
<Pane prefHeight="600.0" prefWidth="800.0" xmlns="http://javafx.com/javafx/8" xmlns:fx="http://javafx.com/fxml/1" fx:controller="sample.Controller">
<children>
<TableView fx:id="dbTable" layoutX="4.0" layoutY="85.0" prefHeight="505.0" prefWidth="790.0">
<columns>
<TableColumn fx:id="siteColumn" prefWidth="263.0" text="Site" />
<TableColumn fx:id="usernameColumn" prefWidth="263.0" text="Username" />
<TableColumn fx:id="passwordColumn" prefWidth="263.0" text="Password" />
</columns>
</TableView>
<GridPane layoutX="14.0" layoutY="27.0" prefHeight="25.0" prefWidth="263.0">
<columnConstraints>
<ColumnConstraints hgrow="SOMETIMES" minWidth="10.0" />
<ColumnConstraints hgrow="SOMETIMES" minWidth="10.0" />
<ColumnConstraints hgrow="SOMETIMES" minWidth="10.0" />
</columnConstraints>
<rowConstraints>
<RowConstraints minHeight="10.0" vgrow="SOMETIMES" />
</rowConstraints>
<children>
<Button fx:id="addNewEntry" layoutX="14.0" layoutY="14.0" mnemonicParsing="false" onMouseClicked="#addEntry" text="Add.." GridPane.columnIndex="0" />
<Button fx:id="removeEntry" layoutX="83.0" layoutY="14.0" mnemonicParsing="false" text="Remove.." GridPane.columnIndex="1" />
<Button fx:id="editEntry" layoutX="178.0" layoutY="14.0" mnemonicParsing="false" text="Edit.." GridPane.columnIndex="2" />
</children>
</GridPane>
<ToggleButton fx:id="showPasswordToggle" layoutX="671.0" layoutY="27.0" mnemonicParsing="false" text="Show Password" />
</children>
</Pane>
STACK TRACE 堆栈跟踪
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:54)
at javafx.event.Event.fireEvent(Event.java:198)
at javafx.scene.Scene$ClickGenerator.postProcess(Scene.java:3470)
at javafx.scene.Scene$ClickGenerator.access$8100(Scene.java:3398)
at javafx.scene.Scene$MouseHandler.process(Scene.java:3766)
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$MouseEventNotification.run(GlassViewEventHandler.java:352)
at com.sun.javafx.tk.quantum.GlassViewEventHandler$MouseEventNotification.run(GlassViewEventHandler.java:275)
at java.security.AccessController.doPrivileged(Native Method)
at com.sun.javafx.tk.quantum.GlassViewEventHandler.lambda$handleMouseEvent$354(GlassViewEventHandler.java:388)
at com.sun.javafx.tk.quantum.QuantumToolkit.runWithoutRenderLock(QuantumToolkit.java:389)
at com.sun.javafx.tk.quantum.GlassViewEventHandler.handleMouseEvent(GlassViewEventHandler.java:387)
at com.sun.glass.ui.View.handleMouseEvent(View.java:555)
at com.sun.glass.ui.View.notifyMouse(View.java:937)
at com.sun.glass.ui.gtk.GtkApplication._runLoop(Native Method)
at com.sun.glass.ui.gtk.GtkApplication.lambda$null$49(GtkApplication.java:139)
at java.lang.Thread.run(Thread.java:745)
Caused by: java.lang.reflect.InvocationTargetException
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:498)
at sun.reflect.misc.Trampoline.invoke(MethodUtil.java:71)
at sun.reflect.GeneratedMethodAccessor1.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:498)
at sun.reflect.misc.MethodUtil.invoke(MethodUtil.java:275)
at javafx.fxml.FXMLLoader$MethodHandler.invoke(FXMLLoader.java:1771)
... 31 more
Caused by: javafx.fxml.LoadException:
/home/umberto/passwordManager/out/production/passwordManager/addEntryDialog.fxml
at javafx.fxml.FXMLLoader.constructLoadException(FXMLLoader.java:2601)
at javafx.fxml.FXMLLoader.loadImpl(FXMLLoader.java:2579)
at javafx.fxml.FXMLLoader.loadImpl(FXMLLoader.java:2441)
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 sample.Controller.addEntry(Controller.java:58)
... 41 more
Caused by: java.lang.NullPointerException
at sample.Controller.loadTableData(Controller.java:45)
at sample.Controller.initialize(Controller.java:30)
at javafx.fxml.FXMLLoader.loadImpl(FXMLLoader.java:2548)
... 49 more
Look at your addEntryDialog.fxml
file. 查看您的
addEntryDialog.fxml
文件。 There is definition of this view's controller: 有此视图的控制器的定义:
<Pane ... fx:controller="sample.Controller>
JavaFX loads the view, looks for the controller and creates it. JavaFX加载视图,寻找控制器并创建它。 (At this moment another
sample.Controller
object is instantiated). (此时,另一个
sample.Controller
对象被实例化)。 After creating it sees that this controller implements Initializable
interface, so it executes initialize
method which in turn calls fillTable
method and finally the statement siteColumn.setCellValueFactory(..)
is reached. 创建后,它会看到该控制器实现了
Initializable
接口,因此它执行了initialize
方法,该方法又调用fillTable
方法,最后到达语句siteColumn.setCellValueFactory(..)
。 The problem is that there's no siteColumn
for addEntryDialog.fxml
view - it has not been binded since there's no element on view with that id. 问题在于
addEntryDialog.fxml
视图没有siteColumn
它没有被绑定,因为视图上没有具有该ID的元素。
Solution is to create proper controller for addEntryView.fxml
and call it in xml fx:controller
attribute. 解决方案是为
addEntryView.fxml
创建适当的控制器,并在xml fx:controller
属性中调用它。
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