Java运行时错误以及加载异常错误

分类：编程问答

如何解决Java运行时错误以及加载异常错误

您好，当我尝试运行在oracle场景构建器中创建的fxml文件时遇到此错误，该fxml文件使用每个按钮的正确名称以及正确标记的控制器类进行了标记，我的控制代码问题中的错误看起来像这样

package prog24178;


import javafx.collections.FXCollections;
import java.util.ArrayList;
import javafx.collections.ObservableList;
import javafx.event.ActionEvent;
import javafx.fxml.FXML;
import javafx.scene.control.Alert;
import javafx.scene.control.Button;

import javafx.scene.control.TextField;
import javafx.scene.control.Alert.AlertType;
import java.io.File;
import java.io.PrintWriter;
import java.util.Scanner;



import javafx.scene.control.ListView;


public class DataBaseController implements Config{
    @FXML TextField txt1,txt2,txt3,txt4;
    @FXML Button b1,b2,b3,b4,b5;
    @FXML ListView<String> list;
    @FXML private ArrayList<String> stringItems = new ArrayList<String>();
    @FXML private ArrayList<Item> items = new ArrayList<Item>();
    
    @FXML
    public void add(ActionEvent e) {
            int id = Integer.parseInt(txt1.getText());
            String item = txt2.getText();
            int quantity = Integer.parseInt(txt3.getText());
            double price = Double.parseDouble(txt4.getText());
            items.add(new Item(id,item,quantity,price));
            list.getItems().clear();
            stringItems.clear();
            for(Item item1 : items) stringItems.add(item1.toString());
            ObservableList<String> items = FXCollections.observableArrayList(stringItems);
            list.setItems(items);
    }
    
    @FXML
    public void load(ActionEvent e) {
        items.clear();
        stringItems.clear();
        list.getItems().clear();
        
        File f = new File(FILE);
        try {
            if(!f.exists()) f.createNewFile();
            Scanner lines = new Scanner(f);
            if(!lines.hasNextLine()) {
                 Alert alert = new Alert(AlertType.INFORMATION,"data file is empty\nenter car and click the save button"); 
                 alert.showAndWait();
            }
            else {
                while(lines.hasNextLine()) {
                    Scanner line = new Scanner(lines.nextLine());
                    line.useDelimiter(":\\s*");
                    items.add(new Item(line.nextInt(),line.next(),line.nextInt(),line.nextDouble()));
                    line.close();
                }
            }
            lines.close();
            
            for(Item item1 : items) 
                list.getItems().add(item1.toString());
                //stringCars.add(car.toString());
            //ObservableList<String> items = FXCollections.observableArrayList(stringCars);
            //list.setItems(items);
            
        } catch (Exception e1) {
            e1.printStackTrace();
        }

    }
    
    @FXML   
        public void save(ActionEvent e)  {
        File f = new File(FILE);
        try {
            if(!f.exists()) f.createNewFile();
            PrintWriter pw = new PrintWriter(f);
            for(Item c : items) 
                pw.printf("%s:%s:%s:%d:%b\n",c.getID(),c.getItem(),c.getQuantity(),c.getPrice());
            pw.close();
        } catch (Exception e1) {
            e1.printStackTrace();
        }
         Alert alert = new Alert(AlertType.INFORMATION,"data is saved in a file\nyou can close the \napplication now"); 
         alert.showAndWait();
    
    }
    @FXML
        public void modify(ActionEvent e)  {
    

        }
    
    @FXML
        public void remove(ActionEvent e)  {
            
        }
        
        }

RunApp类

package prog24178;

import java.net.URL;

import javafx.fxml.FXMLLoader;
import javafx.scene.Parent;
import javafx.scene.Scene;
import javafx.stage.Stage;

public class RunApp extends javafx.application.Application implements Config{
    public static void main(String[] args) {
        launch(args);
    }
    @Override
    public void start(Stage ps) throws Exception {
        URL res = this.getClass().getResource("control.fxml");
        Parent scene = FXMLLoader.load(res);
        Scene ourscene = new Scene(scene);
        ps.setScene(ourscene);
        ps.setTitle("Items Database");
        ps.show();
    }
}

已实现的配置界面

以及完整的错误消息

Exception in Application start method
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 com.sun.javafx.application.LauncherImpl.launchApplicationWithArgs(LauncherImpl.java:389)
    at com.sun.javafx.application.LauncherImpl.launchApplication(LauncherImpl.java:328)
    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.launcher.LauncherHelper$FXHelper.main(LauncherHelper.java:767)
Caused by: java.lang.RuntimeException: Exception in Application start method
    at com.sun.javafx.application.LauncherImpl.launchApplication1(LauncherImpl.java:917)
    at com.sun.javafx.application.LauncherImpl.lambda$launchApplication$1(LauncherImpl.java:182)
    at java.lang.Thread.run(Thread.java:748)
Caused by: javafx.fxml.LoadException: Error resolving onAction='add',either the event handler is not in the Namespace or there is an error in the script.
/C:/Users/Canada%20Computers/workspace/Assign6/bin/prog24178/control.fxml:44

    at javafx.fxml.FXMLLoader.constructLoadException(FXMLLoader.java:2597)
    at javafx.fxml.FXMLLoader.access$100(FXMLLoader.java:103)
    at javafx.fxml.FXMLLoader$Element.processEventHandlerAttributes(FXMLLoader.java:610)
    at javafx.fxml.FXMLLoader$ValueElement.processEndElement(FXMLLoader.java:770)
    at javafx.fxml.FXMLLoader.processEndElement(FXMLLoader.java:2823)
    at javafx.fxml.FXMLLoader.loadImpl(FXMLLoader.java:2532)
    at javafx.fxml.FXMLLoader.loadImpl(FXMLLoader.java:2441)
    at javafx.fxml.FXMLLoader.loadImpl(FXMLLoader.java:3214)
    at javafx.fxml.FXMLLoader.loadImpl(FXMLLoader.java:3175)
    at javafx.fxml.FXMLLoader.loadImpl(FXMLLoader.java:3148)
    at javafx.fxml.FXMLLoader.loadImpl(FXMLLoader.java:3124)
    at javafx.fxml.FXMLLoader.loadImpl(FXMLLoader.java:3104)
    at javafx.fxml.FXMLLoader.load(FXMLLoader.java:3097)
    at prog24178.RunApp.start(RunApp.java:17)
    at com.sun.javafx.application.LauncherImpl.lambda$launchApplication1$8(LauncherImpl.java:863)
    at com.sun.javafx.application.PlatformImpl.lambda$runAndWait$7(PlatformImpl.java:326)
    at com.sun.javafx.application.PlatformImpl.lambda$null$5(PlatformImpl.java:295)
    at java.security.AccessController.doPrivileged(Native Method)
    at com.sun.javafx.application.PlatformImpl.lambda$runLater$6(PlatformImpl.java:294)
    at com.sun.glass.ui.InvokeLaterDispatcher$Future.run(InvokeLaterDispatcher.java:95)
    at com.sun.glass.ui.win.WinApplication._runLoop(Native Method)
    at com.sun.glass.ui.win.WinApplication.lambda$null$4(WinApplication.java:186)
    ... 1 more
Exception running application prog24178.RunApp

FXML代码

    <?xml version="1.0" encoding="UTF-8"?>

<?import javafx.scene.text.*?>
<?import javafx.geometry.*?>
<?import javafx.scene.control.*?>
<?import java.lang.*?>
<?import javafx.scene.layout.*?>

<GridPane maxHeight="-Infinity" maxWidth="-Infinity" minHeight="-Infinity" minWidth="-Infinity" prefHeight="384.0" prefWidth="664.0" xmlns="http://javafx.com/javafx/8" xmlns:fx="http://javafx.com/fxml/1" fx:controller="prog24178.RunApp">
  <columnConstraints>
    <ColumnConstraints hgrow="SOMETIMES" maxWidth="130.0" minWidth="10.0" prefWidth="51.0" />
    <ColumnConstraints hgrow="SOMETIMES" maxWidth="276.0" minWidth="10.0" prefWidth="34.0" />
      <ColumnConstraints hgrow="SOMETIMES" maxWidth="253.0" minWidth="0.0" prefWidth="39.0" />
      <ColumnConstraints hgrow="SOMETIMES" maxWidth="307.0" minWidth="10.0" prefWidth="203.0" />
      <ColumnConstraints hgrow="SOMETIMES" maxWidth="446.0" minWidth="10.0" prefWidth="66.0" />
      <ColumnConstraints hgrow="SOMETIMES" maxWidth="446.0" minWidth="10.0" prefWidth="75.0" />
      <ColumnConstraints hgrow="SOMETIMES" maxWidth="446.0" minWidth="10.0" prefWidth="51.0" />
      <ColumnConstraints hgrow="SOMETIMES" maxWidth="446.0" minWidth="10.0" prefWidth="148.0" />
  </columnConstraints>
  <rowConstraints>
    <RowConstraints />
      <RowConstraints maxHeight="48.0" minHeight="10.0" prefHeight="48.0" />
    <RowConstraints maxHeight="48.0" minHeight="0.0" prefHeight="40.0" />
    <RowConstraints maxHeight="44.0" minHeight="8.0" prefHeight="32.0" vgrow="SOMETIMES" />
      <RowConstraints maxHeight="274.0" minHeight="10.0" prefHeight="32.0" vgrow="SOMETIMES" />
      <RowConstraints maxHeight="274.0" minHeight="10.0" prefHeight="201.0" vgrow="SOMETIMES" />
      <RowConstraints maxHeight="123.0" minHeight="10.0" prefHeight="31.0" vgrow="SOMETIMES" />
  </rowConstraints>
   <children>
      <Label alignment="CENTER_RIGHT" text="ID:" GridPane.halignment="CENTER" GridPane.rowIndex="2" />
      <TextField fx:id="txt1" prefHeight="25.0" prefWidth="46.0" GridPane.columnIndex="1" GridPane.rowIndex="2" />
      <Label text="Item:" GridPane.columnIndex="2" GridPane.halignment="CENTER" GridPane.rowIndex="2" />
      <TextField fx:id="txt2" GridPane.columnIndex="3" GridPane.rowIndex="2" />
      <Label prefHeight="17.0" prefWidth="57.0" text="Quanitity:" GridPane.columnIndex="4" GridPane.halignment="CENTER" GridPane.rowIndex="2" />
      <TextField fx:id="txt3" GridPane.columnIndex="5" GridPane.rowIndex="2" />
      <Label text="Price:" GridPane.columnIndex="6" GridPane.halignment="CENTER" GridPane.rowIndex="2" />
      <TextField fx:id="txt4" GridPane.columnIndex="7" GridPane.rowIndex="2">
         <GridPane.margin>
            <Insets />
         </GridPane.margin>
      </TextField>
      <HBox prefHeight="29.0" prefWidth="516.0" spacing="10.0" GridPane.columnIndex="3" GridPane.columnSpan="2147483647" GridPane.rowIndex="3">
         <children>
            <Button fx:id="b1" mnemonicParsing="false" onAction="add" text="Add Item" />
            <Button fx:id="b2" mnemonicParsing="false" onAction="#modify" text="Modify Item" />
            <Button fx:id="b3" mnemonicParsing="false" onAction="#remove" prefHeight="25.0" prefWidth="107.0" text="Remove Item" />
         </children>
         <GridPane.margin>
            <Insets top="10.0" />
         </GridPane.margin>
      </HBox>
      <HBox prefHeight="100.0" prefWidth="200.0" GridPane.columnSpan="2147483647" GridPane.rowIndex="5">
         <children>
            <ListView fx:id="list" prefHeight="201.0" prefWidth="627.0">
               <padding>
                  <Insets left="20.0" right="10.0" />
               </padding>
            </ListView>
         </children>
      </HBox>
      <Label text="Items:" GridPane.halignment="CENTER" GridPane.rowIndex="4" />
      <HBox prefHeight="100.0" prefWidth="200.0" spacing="10.0" GridPane.columnIndex="3" GridPane.columnSpan="2147483647" GridPane.rowIndex="6">
         <children>
            <Button fx:id="b4" mnemonicParsing="false" onAction="#load" text="Load Data From File" />
            <Button fx:id="b5" mnemonicParsing="false" onAction="#save" text="Save Data To File" />
         </children>
      </HBox>
      <HBox prefHeight="100.0" prefWidth="200.0" GridPane.columnIndex="3" GridPane.columnSpan="2147483647" GridPane.rowIndex="1">
         <children>
            <Label alignment="CENTER" prefHeight="48.0" prefWidth="318.0" text="Database of Items">
               <font>
                  <Font size="26.0" />
               </font>
            </Label>
         </children>
      </HBox>
   </children>
   <opaqueInsets>
      <Insets />
   </opaqueInsets>
</GridPane>

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