JavaFX Acceso un método desde un controlador anidada

Others 2022-04-28 13:16:14 views: 0
Kinya feliz;

Estoy experimentando con tener diferentes archivos FXML con diferentes controladores. El AddBalances.fxml tiene campos de texto de entrada y luego añadir a la base de datos cuando se pulsa el botón de entrada. A continuación, se supone que lo ideal para refrescar la TableView para reflejar la lista actualizada de la base de datos. Esto se supone que debe hacerse por el método sample.refresh (). Actualmente, se actualiza la base de datos, pero no vuelve a cargar los datos para refrescar.

NB el controlador sample.java (donde he anidado otros controladores), puede acceder a los métodos de los controladores anidados bien. es decir, el trabajo bottomLabelController.checkConnection () y tableViewController.loadFinanceData () como se esperaba.

NB Cuando tuve un archivo FXML y un controlador de la TableView actualiza también.

Espero que sea suficiente información.

Aquí está el error (causada por controller.refresh () en el AddBalancesController.

Exception in thread "JavaFX Application Thread" java.lang.RuntimeException: java.lang.reflect.InvocationTargetException
    at javafx.fxml/javafx.fxml.FXMLLoader$MethodHandler.invoke(FXMLLoader.java:1787)
    at javafx.fxml/javafx.fxml.FXMLLoader$ControllerMethodEventHandler.handle(FXMLLoader.java:1670)
    at javafx.base/com.sun.javafx.event.CompositeEventHandler.dispatchBubblingEvent(CompositeEventHandler.java:86)
    at javafx.base/com.sun.javafx.event.EventHandlerManager.dispatchBubblingEvent(EventHandlerManager.java:238)
    at javafx.base/com.sun.javafx.event.EventHandlerManager.dispatchBubblingEvent(EventHandlerManager.java:191)
    at javafx.base/com.sun.javafx.event.CompositeEventDispatcher.dispatchBubblingEvent(CompositeEventDispatcher.java:59)
    at javafx.base/com.sun.javafx.event.BasicEventDispatcher.dispatchEvent(BasicEventDispatcher.java:58)
    at javafx.base/com.sun.javafx.event.EventDispatchChainImpl.dispatchEvent(EventDispatchChainImpl.java:114)
    at javafx.base/com.sun.javafx.event.BasicEventDispatcher.dispatchEvent(BasicEventDispatcher.java:56)
    at javafx.base/com.sun.javafx.event.EventDispatchChainImpl.dispatchEvent(EventDispatchChainImpl.java:114)
    at javafx.base/com.sun.javafx.event.BasicEventDispatcher.dispatchEvent(BasicEventDispatcher.java:56)
    at javafx.base/com.sun.javafx.event.EventDispatchChainImpl.dispatchEvent(EventDispatchChainImpl.java:114)
    at javafx.base/com.sun.javafx.event.EventUtil.fireEventImpl(EventUtil.java:74)
    at javafx.base/com.sun.javafx.event.EventUtil.fireEvent(EventUtil.java:49)
    at javafx.base/javafx.event.Event.fireEvent(Event.java:198)
    at javafx.graphics/javafx.scene.Node.fireEvent(Node.java:8879)
    at javafx.controls/javafx.scene.control.Button.fire(Button.java:200)
    at javafx.controls/com.sun.javafx.scene.control.behavior.ButtonBehavior.mouseReleased(ButtonBehavior.java:206)
    at javafx.controls/com.sun.javafx.scene.control.inputmap.InputMap.handle(InputMap.java:274)
    at javafx.base/com.sun.javafx.event.CompositeEventHandler$NormalEventHandlerRecord.handleBubblingEvent(CompositeEventHandler.java:218)
    at javafx.base/com.sun.javafx.event.CompositeEventHandler.dispatchBubblingEvent(CompositeEventHandler.java:80)
    at javafx.base/com.sun.javafx.event.EventHandlerManager.dispatchBubblingEvent(EventHandlerManager.java:238)
    at javafx.base/com.sun.javafx.event.EventHandlerManager.dispatchBubblingEvent(EventHandlerManager.java:191)
    at javafx.base/com.sun.javafx.event.CompositeEventDispatcher.dispatchBubblingEvent(CompositeEventDispatcher.java:59)
    at javafx.base/com.sun.javafx.event.BasicEventDispatcher.dispatchEvent(BasicEventDispatcher.java:58)
    at javafx.base/com.sun.javafx.event.EventDispatchChainImpl.dispatchEvent(EventDispatchChainImpl.java:114)
    at javafx.base/com.sun.javafx.event.BasicEventDispatcher.dispatchEvent(BasicEventDispatcher.java:56)
    at javafx.base/com.sun.javafx.event.EventDispatchChainImpl.dispatchEvent(EventDispatchChainImpl.java:114)
    at javafx.base/com.sun.javafx.event.BasicEventDispatcher.dispatchEvent(BasicEventDispatcher.java:56)
    at javafx.base/com.sun.javafx.event.EventDispatchChainImpl.dispatchEvent(EventDispatchChainImpl.java:114)
    at javafx.base/com.sun.javafx.event.EventUtil.fireEventImpl(EventUtil.java:74)
    at javafx.base/com.sun.javafx.event.EventUtil.fireEvent(EventUtil.java:54)
    at javafx.base/javafx.event.Event.fireEvent(Event.java:198)
    at javafx.graphics/javafx.scene.Scene$MouseHandler.process(Scene.java:3851)
    at javafx.graphics/javafx.scene.Scene$MouseHandler.access$1200(Scene.java:3579)
    at javafx.graphics/javafx.scene.Scene.processMouseEvent(Scene.java:1849)
    at javafx.graphics/javafx.scene.Scene$ScenePeerListener.mouseEvent(Scene.java:2588)
    at javafx.graphics/com.sun.javafx.tk.quantum.GlassViewEventHandler$MouseEventNotification.run(GlassViewEventHandler.java:397)
    at javafx.graphics/com.sun.javafx.tk.quantum.GlassViewEventHandler$MouseEventNotification.run(GlassViewEventHandler.java:295)
    at java.base/java.security.AccessController.doPrivileged(AccessController.java:391)
    at javafx.graphics/com.sun.javafx.tk.quantum.GlassViewEventHandler.lambda$handleMouseEvent$2(GlassViewEventHandler.java:434)
    at javafx.graphics/com.sun.javafx.tk.quantum.QuantumToolkit.runWithoutRenderLock(QuantumToolkit.java:390)
    at javafx.graphics/com.sun.javafx.tk.quantum.GlassViewEventHandler.handleMouseEvent(GlassViewEventHandler.java:433)
    at javafx.graphics/com.sun.glass.ui.View.handleMouseEvent(View.java:556)
    at javafx.graphics/com.sun.glass.ui.View.notifyMouse(View.java:942)
    at javafx.graphics/com.sun.glass.ui.win.WinApplication._runLoop(Native Method)
    at javafx.graphics/com.sun.glass.ui.win.WinApplication.lambda$runLoop$3(WinApplication.java:174)
    at java.base/java.lang.Thread.run(Thread.java:830)
Caused by: java.lang.reflect.InvocationTargetException
    at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
    at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.base/java.lang.reflect.Method.invoke(Method.java:567)
    at com.sun.javafx.reflect.Trampoline.invoke(MethodUtil.java:76)
    at jdk.internal.reflect.GeneratedMethodAccessor2.invoke(Unknown Source)
    at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.base/java.lang.reflect.Method.invoke(Method.java:567)
    at javafx.base/com.sun.javafx.reflect.MethodUtil.invoke(MethodUtil.java:273)
    at javafx.fxml/com.sun.javafx.fxml.MethodHelper.invoke(MethodHelper.java:83)
    at javafx.fxml/javafx.fxml.FXMLLoader$MethodHandler.invoke(FXMLLoader.java:1784)
    ... 47 more
Caused by: java.lang.NullPointerException
    at BudgetApp/sample.AddBalancesController.addBalances(AddBalancesController.java:65)
    ... 58 more

sample.fxml

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

<?import javafx.geometry.*?>
<?import javafx.scene.control.*?>
<?import javafx.scene.layout.*?>
<BorderPane maxHeight="-Infinity" maxWidth="-Infinity" minHeight="-Infinity" minWidth="-Infinity" prefHeight="700.0" prefWidth="1280.0"
            xmlns="http://javafx.com/javafx/11.0.1"
            xmlns:fx="http://javafx.com/fxml/1"
            fx:controller="sample.Controller">
   <top>
      <fx:include source="menuBar.fxml"/>
   </top>
   <left>
      <VBox prefHeight="375.0" prefWidth="225.0" BorderPane.alignment="CENTER">
         <fx:include source="ViewBalances.fxml" fx:id="viewBalances"/>
         <fx:include source="AddBalances.fxml" fx:id="addBalances"/>
         <BorderPane.margin>
            <Insets bottom="5.0" left="5.0" right="5.0" top="5.0" />
         </BorderPane.margin>
      </VBox>
   </left>
   <center>
      <fx:include source="TableView.fxml" fx:id="tableView"/>
   </center>
   <bottom>
      <fx:include source="BottomLabel.fxml" fx:id="bottomLabel"/>
   </bottom>
</BorderPane>

Controller.java (Controller para sample.fxml)


    package sample;

import datasource.DbConnect;
import datasource.DbModel;
import javafx.fxml.FXML;
import javafx.fxml.Initializable;
import java.net.URL;
import java.util.ResourceBundle;



public class Controller implements Initializable {


    private DbConnect dbConnect;

    DbModel dbModel = new DbModel();


    @FXML
    private BottomLabelController bottomLabelController;
    @FXML
    private TableViewController tableViewController;
    @FXML
    private AddBalancesController addBalancesController;

    public void initialize(URL url, ResourceBundle rb){

        bottomLabelController.checkConnection();
        tableViewController.loadFinanceData();
    }

    public void refresh(){

        tableViewController.loadFinanceData();
    }

}

AddBalances.fxml


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


<?import javafx.geometry.*?>
<?import javafx.scene.control.*?>
<?import javafx.scene.layout.*?>
<VBox prefHeight="403.0" prefWidth="225.0" xmlns="http://javafx.com/javafx"
      xmlns:fx="http://javafx.com/fxml"
      fx:controller="sample.AddBalancesController">
    <children>
        <Label prefHeight="17.0" prefWidth="220.0" text="Enter Balances">
            <VBox.margin>
                <Insets left="10.0" right="10.0" top="10.0"/>
            </VBox.margin>
        </Label>
        <DatePicker fx:id="datepicker" prefWidth="220.0" promptText="Date">
            <VBox.margin>
                <Insets left="5.0" right="5.0" top="5.0"/>
            </VBox.margin>
        </DatePicker>
        <TextField fx:id="cashfield" promptText="Cash">
            <VBox.margin>
                <Insets left="5.0" right="5.0" top="5.0"/>
            </VBox.margin>
        </TextField>
        <TextField fx:id="mpesafield" layoutX="10.0" layoutY="37.0" promptText="Mpesa">
            <VBox.margin>
                <Insets left="5.0" right="5.0" top="5.0"/>
            </VBox.margin>
        </TextField>
        <TextField fx:id="bankfield" layoutX="10.0" layoutY="62.0" promptText="Bank">
            <VBox.margin>
                <Insets left="5.0" right="5.0" top="5.0"/>
            </VBox.margin>
        </TextField>
        <TextField fx:id="stimafield" layoutX="10.0" layoutY="112.0" promptText="Stima Sacco">
            <VBox.margin>
                <Insets left="5.0" right="5.0" top="5.0"/>
            </VBox.margin>
        </TextField>
        <TextField fx:id="field" layoutX="10.0" layoutY="137.0" promptText="Loan">
            <VBox.margin>
                <Insets left="5.0" right="5.0" top="5.0"/>
            </VBox.margin>
        </TextField>
        <TextField fx:id="advancefield" layoutX="10.0" layoutY="162.0" promptText="Advance">
            <VBox.margin>
                <Insets left="5.0" right="5.0" top="5.0"/>
            </VBox.margin>
        </TextField>
        <Button fx:id="postbutton" mnemonicParsing="false" onAction="#addBalances" prefHeight="25.0" prefWidth="229.0"
                text="Post">
            <VBox.margin>
                <Insets left="5.0" right="5.0" top="5.0"/>
            </VBox.margin>
        </Button>
    </children>
</VBox>

AddBalancesController.java (Controller para Addbalances.fxml)


package sample;

import datasource.DbConnect;
import javafx.fxml.FXML;
import javafx.scene.control.Button;
import javafx.scene.control.DatePicker;
import javafx.scene.control.TextField;

import java.sql.Connection;
import java.sql.PreparedStatement;
import java.sql.SQLException;

public class AddBalancesController {

    @FXML
    private Controller controller;
    @FXML
    private TableViewController tableViewController;
    @FXML
    private DatePicker datepicker;
    @FXML
    private TextField cashfield;
    @FXML
    private TextField mpesafield;
    @FXML
    private TextField bankfield;
    @FXML
    private TextField stimafield;
    @FXML
    private TextField loanfield;
    @FXML
    private TextField advancefield;
    @FXML
    private Button postbutton;


    @FXML
    public void addBalances() {

        String sqlinsert = "INSERT INTO data(date, cash, mpesa, bank, stimasacco, loan, advance) VALUES (?, ?, ?, ?, ?, ?, ?)";
        try {

            Connection connection = DbConnect.getConnection();
            PreparedStatement insertPreparedStatement = connection.prepareStatement(sqlinsert);

            insertPreparedStatement.setString(1, this.datepicker.getEditor().getText());
            insertPreparedStatement.setString(2, this.cashfield.getText());
            insertPreparedStatement.setString(3, this.mpesafield.getText());
            insertPreparedStatement.setString(4, this.bankfield.getText());
            insertPreparedStatement.setString(5, this.stimafield.getText());
            insertPreparedStatement.setString(6, this.loanfield.getText());
            insertPreparedStatement.setString(7, this.advancefield.getText());


            insertPreparedStatement.execute();

            this.datepicker.setValue(null);
            this.cashfield.setText("");
            this.mpesafield.setText("");
            this.bankfield.setText("");
            this.stimafield.setText("");
            this.loanfield.setText("");
            this.advancefield.setText("");

            controller.refresh();

            connection.close();

        } catch (SQLException e) {

            System.out.println("addBalances() " + e.getMessage());

        }

    }

}

TableView.fxml


    <?xml version="1.0" encoding="UTF-8"?>
<?import javafx.scene.control.*?>
<?import javafx.scene.layout.BorderPane?>


<TableView fx:id="financeDataTableView" prefHeight="200.0" prefWidth="200.0" BorderPane.alignment="CENTER"
           xmlns="http://javafx.com/javafx"
           xmlns:fx="http://javafx.com/fxml"
           fx:controller="sample.TableViewController">
    <columns>
        <TableColumn fx:id="date" prefWidth="75.0" text="Date"/>
        <TableColumn fx:id="cashinwallet" prefWidth="75.0" text="Cash in Wallet"/>
        <TableColumn fx:id="mpesa" prefWidth="75.0" text="Mpesa"/>
        <TableColumn fx:id="bank" prefWidth="75.0" text="Bank"/>
        <TableColumn fx:id="stimasacco" prefWidth="75.0" text="Stima Sacco"/>
        <TableColumn fx:id="loan" prefWidth="93.0" text="Loan"/>
        <TableColumn fx:id="advance" prefWidth="93.0" text="Advance"/>
    </columns>
</TableView>

TableViewController.java (Controller para Tableview.fxml)

package sample;

import datasource.DbConnect;
import datasource.FinanceData;
import javafx.collections.FXCollections;
import javafx.collections.ObservableList;
import javafx.fxml.FXML;
import javafx.scene.control.TableColumn;
import javafx.scene.control.TableView;
import javafx.scene.control.cell.PropertyValueFactory;

import java.sql.Connection;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.text.ParseException;

public class TableViewController {

    @FXML
    private TableColumn<FinanceData, String> date;
    @FXML
    private TableColumn <FinanceData, String> cashinwallet;
    @FXML
    private TableColumn <FinanceData, String> mpesa;
    @FXML
    private TableColumn <FinanceData, String> bank;
    @FXML
    private TableColumn <FinanceData, String> stimasacco;
    @FXML
    private TableColumn <FinanceData, String> loan;
    @FXML
    private TableColumn <FinanceData, String> advance;
    @FXML
    private TableView<FinanceData> financeDataTableView;


    private ObservableList<FinanceData> financeDataObservableList;

    @FXML
    public void loadFinanceData(){

        try {
            Connection connection = DbConnect.getConnection();
            financeDataObservableList = FXCollections.observableArrayList();

            String sqlselect = "SELECT * FROM data";
            ResultSet resultSet = connection.createStatement().executeQuery(sqlselect);

            while (resultSet.next()) {

                financeDataObservableList.add(new FinanceData(resultSet.getString(1),
                        resultSet.getString(2), resultSet.getString(3),
                        resultSet.getString(4), resultSet.getString(5),
                        resultSet.getString(6), resultSet.getString(7)));
            }

            connection.close();
        } catch (SQLException | ParseException e) {

            System.out.println("loadFinanceData(): " + e.getMessage());
        }



        try {
            date.setCellValueFactory(new PropertyValueFactory<>("datefield"));
            cashinwallet.setCellValueFactory(new PropertyValueFactory<>("cashfield"));
            mpesa.setCellValueFactory(new PropertyValueFactory<>("mpesafield"));
            bank.setCellValueFactory(new PropertyValueFactory<>("bankfield"));
            stimasacco.setCellValueFactory(new PropertyValueFactory<>("stimafield"));
            loan.setCellValueFactory(new PropertyValueFactory<>("loanfield"));
            advance.setCellValueFactory(new PropertyValueFactory<>("advancefield"));

            financeDataTableView.setItems(null);
            financeDataTableView.setItems(financeDataObservableList);

        } catch (Exception e) {

            System.out.println("setcellvalue: " + e.getMessage());
        }

    }
}````
Abra:

Como usted escribió en su pregunta ...

Aquí está el error (causada por controller.refresh () en el AddBalancesController.

controller.refresh()es la línea 65 en el expediente AddBalancesController.javay, de acuerdo con el seguimiento de la pila informados, esta línea está lanzando NullPointerExceptionlo que significa que controlleres nulo.

controlleres un miembro de la clase AddBalancesControllery se anota con @FXML. Estas son las líneas de código relevantes de la clase AddBalancesController:

@FXML
private Controller controller;

Sin embargo AddBalances.fxmles un FXML anidada de sample.fxmlcuyo "controlador" es una instancia de la clase Controller. Aquí están los extractos pertinentes de archivo sample.fxml:

fx:controller="sample.Controller">
.
.
<fx:include source="AddBalances.fxml" fx:id="addBalances"/>

Y de hecho addBalanceses un miembro de la clase Controller...

@FXML
private AddBalancesController addBalancesController;

Me parece que piensan que el cargador FXML también se inicializará miembro de controllerla clase AddBalancesControllery que es donde se equivoca. En otras palabras, se necesita inicializar miembro de controllerla clase AddBalancesController, de lo contrario el miembro es nulo y por lo tanto el NullPointerException.

Probablemente la forma más sencilla de miembro de inicialización controlleren la clase AddBalancesControllersería añadir un método a la clase AddBalancesController, por ejemplo,

public void setSampleController(Controller controller) {
    this.controller = controller;
}

A continuación, en la clase Controller, llamar a este método - probablemente en el método initialize()de esa clase, como en:

public void initialize(URL url, ResourceBundle rb){
    bottomLabelController.checkConnection();
    tableViewController.loadFinanceData();
    addBalancesController.setSampleController(this); // I added this line.
}

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