当应用程序初始化时，FXMLLoader.constructLoadException被阻止 [英] FXMLLoader.constructLoadException occuered when app gets initialize
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问题描述
我已经构建了联系人管理器应用程序，当我尝试运行它时，我在java.security.AccessController上遇到以下错误
I have build contact manager app and When I try to run it I got following error
at java.security.AccessController.doPrivileged(Native Method)
at com.sun.javafx.application.PlatformImpl.lambda$runLater$174(PlatformImpl.java:294)
at `enter code here`com.sun.glass.ui.InvokeLaterDispatcher$Future.run(InvokeLaterDispatcher.java:95)
at com.sun.glass.ui.win.WinApplication._runLoop(Native Method)
at com.sun.glass.ui.win.WinApplication.lambda$null$148(WinApplication.java:191)
at java.lang.Thread.run(Thread.java:745)
Caused by: java.lang.NullPointerException
at addressapp.PersonOverviewController.initialize(PersonOverviewController.java:52)
at javafx.fxml.FXMLLoader.loadImpl(FXMLLoader.java:2548)
... 13 more
之后，我在 initialize（）块和<$ c中搜索停止了应用程序的位置$ c> setCellValueFactory（） of我的表视图列。这是我的控制器代码。请告诉我这段代码的问题是什么？
After that I searched where there the application stopped stopped within the initialize() block and setCellValueFactory() of my table view column. This is my controller code. Please tell me what is the matter of this code?
控制器
package addressapp;
import addressapp.Model.Person;
import java.net.URL;
import java.util.ResourceBundle;
import javafx.fxml.FXML;
import javafx.fxml.Initializable;
import javafx.scene.control.Label;
import javafx.scene.control.TableColumn;
import javafx.scene.control.TableView;
import javafx.scene.control.cell.PropertyValueFactory;
public class PersonOverviewController implements Initializable {
@FXML
private TableView<Person> personTable;
@FXML
private TableColumn<Person, String> firstNameColumn;
@FXML
private TableColumn<Person, String> lastNameColumn;
@FXML
private Label firstNameLabel;
@FXML
private Label lastNameLabel;
@FXML
private Label streetLabel;
@FXML
private Label postalCodeLabel;
@FXML
private Label cityLabel;
@FXML
private Label birthdayLabel;
private AddressApp AddressApp;
public PersonOverviewController() {
}
@Override
public void initialize(URL url, ResourceBundle rb) {
firstNameColumn.setCellValueFactory(new PropertyValueFactory<>("firstName"));
lastNameColumn.setCellValueFactory(new PropertyValueFactory<>("lastName"));
}
public void setMainApp(AddressApp mainApp) {
this.AddressApp = mainApp;
personTable.setItems(mainApp.getPersonData());
}
}
这里我的FXML
<?xml version="1.0" encoding="UTF-8"?>
<?import java.lang.*?>
<?import java.util.*?>
<?import javafx.scene.*?>
<?import javafx.scene.control.*?>
<?import javafx.scene.layout.*?>
<AnchorPane id="AnchorPane" prefHeight="484.0" prefWidth="584.0" xmlns="http://javafx.com/javafx/8" xmlns:fx="http://javafx.com/fxml/1" fx:controller="addressapp.PersonOverviewController">
<children>
<Label fx:id="label" layoutX="126" layoutY="120" minHeight="16" minWidth="69" />
<SplitPane layoutX="-2.0" prefHeight="484.0" prefWidth="584.0" AnchorPane.bottomAnchor="0.0" AnchorPane.leftAnchor="0.0" AnchorPane.rightAnchor="0.0" AnchorPane.topAnchor="0.0">
<items>
<AnchorPane prefHeight="300.0" prefWidth="600.0">
<children>
<SplitPane dividerPositions="0.29797979797979796" layoutX="14.0" prefHeight="482.0" prefWidth="582.0" AnchorPane.bottomAnchor="0.0" AnchorPane.leftAnchor="0.0" AnchorPane.rightAnchor="0.0" AnchorPane.topAnchor="0.0">
<items>
<AnchorPane minHeight="0.0" minWidth="0.0" prefHeight="160.0" prefWidth="100.0">
<children>
<TableView id="personTable" layoutX="-7.0" layoutY="40.0" prefHeight="480.0" prefWidth="170.0" AnchorPane.bottomAnchor="0.0" AnchorPane.leftAnchor="0.0" AnchorPane.rightAnchor="0.0" AnchorPane.topAnchor="0.0">
<columns>
<TableColumn id="firstNameColumn" prefWidth="75.0" text="First Name" />
<TableColumn id="lastNameColumn" prefWidth="83.0" text="Last Name" />
</columns>
<columnResizePolicy>
</columnResizePolicy>
</TableView>
</children>
</AnchorPane>
<AnchorPane minHeight="0.0" minWidth="0.0" prefHeight="160.0" prefWidth="100.0">
<children>
<Label layoutX="25.0" layoutY="25.0" text="Person Details" AnchorPane.leftAnchor="5.0" AnchorPane.topAnchor="5.0" />
<GridPane layoutX="14.0" layoutY="42.0" AnchorPane.leftAnchor="5.0" AnchorPane.rightAnchor="5.0" AnchorPane.topAnchor="40.0">
<columnConstraints>
<ColumnConstraints hgrow="SOMETIMES" minWidth="10.0" prefWidth="100.0" />
<ColumnConstraints hgrow="SOMETIMES" minWidth="10.0" prefWidth="100.0" />
</columnConstraints>
<rowConstraints>
<RowConstraints minHeight="10.0" prefHeight="30.0" vgrow="SOMETIMES" />
<RowConstraints minHeight="10.0" prefHeight="30.0" vgrow="SOMETIMES" />
<RowConstraints minHeight="10.0" prefHeight="30.0" vgrow="SOMETIMES" />
<RowConstraints minHeight="10.0" prefHeight="30.0" vgrow="SOMETIMES" />
<RowConstraints minHeight="10.0" prefHeight="30.0" vgrow="SOMETIMES" />
<RowConstraints minHeight="10.0" prefHeight="30.0" vgrow="SOMETIMES" />
</rowConstraints>
<children>
<Label text="First Name" />
<Label text="Last Name" GridPane.rowIndex="1" />
<Label text="Street" GridPane.rowIndex="2" />
<Label text="City" GridPane.rowIndex="3" />
<Label text="Postal Code" GridPane.rowIndex="4" />
<Label text="Birthday" GridPane.rowIndex="5" />
<Label id="firstNameLabel" text="Label" GridPane.columnIndex="1" />
<Label id="lastNameLabel" text="Label" GridPane.columnIndex="1" GridPane.rowIndex="1" />
<Label id="streetLabel" text="Label" GridPane.columnIndex="1" GridPane.rowIndex="2" />
<Label id="postalCodeLabel" text="Label" GridPane.columnIndex="1" GridPane.rowIndex="3" />
<Label id="cityLabel" text="Label" GridPane.columnIndex="1" GridPane.rowIndex="4" />
<Label id="birthdayLabel" text="Label" GridPane.columnIndex="1" GridPane.rowIndex="5" />
</children>
</GridPane>
<Button layoutX="338.0" layoutY="441.0" mnemonicParsing="false" text="Delete" />
<Button layoutX="286.0" layoutY="441.0" mnemonicParsing="false" text="Edit.." />
<Button layoutX="232.0" layoutY="441.0" mnemonicParsing="false" text="New.." AnchorPane.rightAnchor="126.0" />
</children>
</AnchorPane>
</items>
</SplitPane>
</children></AnchorPane>
</items>
</SplitPane>
</children>
</AnchorPane>
推荐答案
您的FXML文件使用 id 属性，而不是所有控件上的 fx：id 属性。因此， @FXML - 注释字段均未被 FXMLLoader 初始化。
Your FXML file is using an id attribute, instead of the fx:id attribute on all the controls. Consequently, none of the @FXML-annotated fields are initialized by the FXMLLoader.
你需要
<TableColumn fx:id="firstNameColumn" prefWidth="75.0" text="First Name" />
<TableColumn fx:id="lastNameColumn" prefWidth="83.0" text="Last Name" />
和所有其他控件类似。
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