Question

我正在调用一个弹出窗口，该窗口的主窗口上的按钮具有 TableView 。我之前在显示“弹出窗口”时遇到问题，但这是因为我设置了错误的路径。我现在需要在弹出窗口中实现TableView。由于需要在弹出窗口中使用某些功能，因此需要将控制器类添加到GenderPopup.fxml文件中。这是我收到错误消息的时候。

我有以下文件：

Student.java（src / sample / model）

StudentController.java（src / sample / controller）

SexDAO.java（src / sample / model）

StudentView.fxml（src / sample / view）

GenderPopup.fxml（src / sample / view）

如果TableView位于主窗口中，则效果很好。

// Student.java file
public class Student {
    private StringProperty student_id;
    private StringProperty first_name;
    private StringProperty last_name;
    private StringProperty gender_code;
    private StringProperty gender_description;

// Constructor
public Student() {
        this.student_id = new SimpleStringProperty();
        this.first_name = new SimpleStringProperty();
        this.last_name = new SimpleStringProperty();
        this.gender_code = new SimpleStringProperty();
        this.gender_description = new SimpleStringProperty();
    }

// Functions for TableView
    public void setGenderCode(String genderCode){
        this.gender_code.set(genderCode);
    }

    public StringProperty genderCodeProperty() {
        return gender_code;
    }

    public void setGenderDescription(String genderDescription){
        this.gender_description.set(genderDescription);
    }

    public StringProperty genderDescriptionProperty() {
        return gender_description;
    }
}

// StudentController.java
public class StudentController {

@FXML private TextField studentIdText;
@FXML private TextField lastNameText;
@FXML private TextField firstNameText;

@FXML private TableView genderTable;
@FXML private TableColumn<Student, String>  genderCodeColumn;
@FXML private TableColumn<Student, String>  genderDescriptionColumn;
@FXML private ActionEvent actionEvent;

private void initialize () {
    // Currently commented as I am getting an Error
    //  genderCodeColumn.setCellValueFactory(cellData -> cellData.getValue().genderCodeProperty());
    //  genderDescriptionColumn.setCellValueFactory(cellData -> cellData.getValue().genderDescriptionProperty());
}

@FXML
public void showGenderPopup() throws IOException {
    try {
        FXMLLoader fxmlLoader = new FXMLLoader(getClass().getResource("/sample/view/GenderPopup.fxml"));
        Parent root = (Parent) fxmlLoader.load();
        Scene scene = new Scene(root);
        Stage stage = new Stage();
        stage.setScene(scene);
        stage.show();
        searchAllGender(this.actionEvent);
        genderCodeColumn.setCellValueFactory(cellData -> cellData.getValue().genderCodeProperty());
        genderDescriptionColumn.setCellValueFactory(cellData -> cellData.getValue().genderDescriptionProperty());
} catch (IOException e)
    {
    e.printStackTrace();
  } catch (SQLException e) {
        e.printStackTrace();
    } catch (ClassNotFoundException e) {
        e.printStackTrace();
    }
}

//Search all Genders
@FXML
private void searchAllGender(ActionEvent actionEvent) throws SQLException, ClassNotFoundException {
    this.actionEvent = actionEvent;
    try {
        //Get all Gender information
        ObservableList<Student> genderData = SexDAO.searchAllGender();
        //Populate Genders on TableView
        populateGenders(genderData);
    } catch (SQLException e){
       System.out.println("Error occurred while getting Gender information from DB.\n" + e);
      throw e;
    }
}

// Populate Genders for TableView
@FXML
private void populateGenders (ObservableList<Student> genderData) throws ClassNotFoundException {
    //Set items to the genderTable
    genderTable.setItems(genderData);
}

// GenderPopup.fxml
// I have removed Height/Width etc as the line was quite long on here
<AnchorPane xmlns="http://javafx.com/javafx/8.0.171" xmlns:fx="http://javafx.com/fxml/1" fx:controller="sample.controller.StudentController">
</AnchorPane>

**错误：*

javafx.fxml.LoadException：     在javafx.fxml.FXMLLoader.constructLoadException（FXMLLoader.java:2601）     在javafx.fxml.FXMLLoader.loadImpl（FXMLLoader.java:2571）     在javafx.fxml.FXMLLoader.loadImpl（FXMLLoader.java:2441）     在javafx.fxml.FXMLLoader.load（FXMLLoader.java:2409）

由以下原因引起：java.lang.reflect.InvocationTargetException

原因：java.lang.NullPointerException

尝试使用TableView调用弹出窗口时引发LoadException

0 个答案: