如何避免不在FX应用程序线程上; currentThread = JavaFX应用程序线程错误?

时间:2014-01-13 04:34:09

标签: multithreading javafx javafx-8 javafx-2

下面的代码片段给出了错误Not on FX application thread; currentThread = JavaFX Application Thread。此应用程序在java 1.7中运行正常但是当我将其移动到fx8时,它现在给出了错误。当我在第一次尝试时启动应用程序时它正在按预期工作。但是在关闭舞台并再次打开它之后它无法正常工作。

错误也是不明确的Not On fx application thread and current thread- javafx application thread。如果当前线程是fx应用程序线程,那么对于fx应用程序线程没有意义。

      progressDialog = createProgressDialog(service);
        progressDialog.show();
        progressDialog.setOnCloseRequest(new EventHandler<WindowEvent>() {
          @Override
          public void handle(WindowEvent event) {
            // if (service.isRunning()) {
            // service.cancel();
            progressDialog.close();
            // }
          }
        });

      }

      @SuppressWarnings("unchecked")
      private Stage createProgressDialog(final Service<IStatus> service) {
        stage = new Stage();

        URL url = FileLocator.find(Activator.getDefault().getBundle(),
            new Path("icons/xxx_16x16.png"), null); //$NON-NLS-1$
        stage.getIcons().add(new Image(url.getFile()));
        stage.setTitle("Downloading ..."); //$NON-NLS-1$
        // Creating StackPane
        stage.initModality(Modality.WINDOW_MODAL);
}

6 个答案:

答案 0 :(得分:37)

当我从javafx 2中的任务修改UI元素时,发生了这种情况,例如listview元素。A Task Which Modifies The Scene Graph帮助我解决了问题,即通过

更新UI元素
 final ListView<String> group = new ListView ();

 Task<Void> task = new Task<Void>() {

     @Override protected Void call() throws Exception {

         group.getItems().clear();  

          for (int i=0; i<100; i++) {                
             Platform.runLater(new Runnable() {
                 @Override public void run() {
                     group.getItems.add(i);
                 }
             });
         }
         return null;
     }
 };

答案 1 :(得分:14)

Platform.setImplicitExit(false);解决了我的问题。我认为他们改变了JavaFX 8中的实现,因此在JavaFX 2中没有任何问题的相同代码在那里给出了而不是fx应用程序线程错误。

答案 2 :(得分:14)

当您尝试更改某些组件UI(如标签文本)时,应该会发生这种情况。这样的运行总是起作用:

@FXML Label myLabel;

Platform.runLater(new Runnable(){
   myLabel.setText("some text");
});

答案 3 :(得分:5)

您可以在代码的任何部分更改表单或转到其他视图或fxml:

Platform.runLater(() -> {
                            try {
                                Stage st = new Stage();
                                Parent sceneMain = FXMLLoader.load(getClass().getResource("/com/load/free/form/LoadFile.fxml"));
                                Scene scene = new Scene(sceneMain);
                                st.setScene(scene);
                                st.setMaximized(true);
                                st.setTitle("load");
                                st.show();
                            } catch (IOException ex) {
                                Logger.getLogger(LoginController.class.getName()).log(Level.SEVERE, null, ex);
                            }
                        });

我的控制器中的示例:

import java.io.IOException;
import java.net.URL;
import java.util.ResourceBundle;
import java.util.logging.Level;
import java.util.logging.Logger;
import javafx.application.Platform;
import javafx.concurrent.Task;
import javafx.event.ActionEvent;
import javafx.fxml.FXML;
import javafx.fxml.FXMLLoader;
import javafx.fxml.Initializable;
import javafx.scene.Parent;
import javafx.scene.Scene;
import javafx.scene.control.Hyperlink;
import javafx.scene.control.Label;
import javafx.scene.control.TextField;
import javafx.stage.Stage;


public class LoginController implements Initializable {

    @FXML
    private TextField txtUser;

    @FXML
    private TextField txtPassword;

    @FXML
    private Hyperlink urlForgetPassword;

    @FXML
    private Label lblError;

    @Override
    public void initialize(URL url, ResourceBundle rb) {

    }

    public void isLoginAction(ActionEvent event) {
        String message = "Ingrese ";
        boolean isEmtpy = false;

        if (txtUser.getText().trim().isEmpty()) {
            message += "usuario y ";
            isEmtpy = true;
        }

        if (txtPassword.getText().trim().isEmpty()) {
            message += "contraseña  ";
            isEmtpy = true;
        }
        isEmtpy = false;
        if (isEmtpy) {
            message = message.substring(0, message.length() - 2);
            lblError.getStyleClass().remove("message_process");
            lblError.getStyleClass().add("message_error");
            lblError.setText(message);
        } else {
            lblError.getStyleClass().add("message_process");
            lblError.getStyleClass().remove("message_error");
            Task task = new Task<Void>() {
                @Override
                protected Void call() throws Exception {
                    updateMessage("Procesando...");
                    System.out.println("Asignando DATOS DE PRUEBA ");
                    String passEnc = Encripta.encriptar(txtPassword.getText(), Encripta.HASH_SHA1);
                    int typeRest = new RestConnection().getConnectionUser(txtUser.getText(), passEnc);
                    if (typeRest == 1) {
                        //Load Another form
                        Platform.runLater(() -> {
                            try {
                                Stage st = new Stage();
                                Parent sceneMain = FXMLLoader.load(getClass().getResource("/com/load/free/form/LoadFile.fxml"));
                                Scene scene = new Scene(sceneMain);
                                st.setScene(scene);
                                st.setMaximized(true);
                                st.setTitle("");
                                st.show();
                            } catch (IOException ex) {
                                Logger.getLogger(LoginController.class.getName()).log(Level.SEVERE, null, ex);
                            }
                        });

                    } else {
                        lblError.getStyleClass().remove("message_process");
                        lblError.getStyleClass().add("message_error");
                        updateMessage("Usuario y/o contraseña incorrectos");
                    }
                    return null;
                }
            };

            lblError.textProperty().bind(task.messageProperty());
            new Thread(task).start();

        }

    }

}

答案 4 :(得分:1)

它没有在上面的代码中明确显示,但我相当确定发生的是你在应用程序(主)javafx线程之外创建一个线程,然后你试图在javafx对象上执行操作(如关闭,打开窗户等)在SECOND线程上。这是严格禁止的,因为只有主线程可以直接控制javafx对象。如果这成为程序的一个要求,你需要使用第二个线程进行其他事情,比如计算等等。你必须使用某种形式的消息传递让另一个线程知道你想做任何javafx动作。

答案 5 :(得分:0)

在尝试为程序添加启动屏幕时,我遇到了相同的问题。这就是我的代码

CircleTest pForm = new CircleTest();

Task<Void> task = new Task<Void>() {
    @Override
    public Void call() {

        try {
            FXMLLoader loader = new FXMLLoader(
                Main.class.getResource("/newRegistration/HomePage.fxml"));
            AnchorPane page = (AnchorPane) loader
                .load();
            dialogStagee.getIcons().add(new Image("/piks/showthumb.png"));
            dialogStagee.setTitle("WALGOTECH SOLUTIONS: 0703445354");
            dialogStagee.initModality(Modality.APPLICATION_MODAL);
            Scene scene = new Scene(page);
            dialogStagee.setScene(scene);
            HomePageController controller = loader.getController();
            controller.setDialogStage(dialogStagee);
            dialogStagee.setMaximized(true);
            dialogStagee.initStyle(StageStyle.UNDECORATED);

            conn.prepareStatement(
                "INSERT INTO `logs`(`date`,`user`,`Terminal`,`Action`)"
                    + " VALUES ('"
                    + (java.time.LocalDate.now()
                    + " "
                    + java.time.LocalTime.now().getHour()
                    + ":"
                    + java.time.LocalTime.now().getMinute()
                    + ":" + java.time.LocalTime.now().getSecond())
                    + "',"
                    + "'"
                    + DbConnector.getMyVariablepatientvameloginCategory()
                                                        .split("as")[1]
                    + "',"
                    + "'"
                    + StartPageController.hostname
                    + "',"
                    + " 'Logged in into Registration')")
                                        .execute();
            } catch (Exception e) {
                    e.printStackTrace();
            }   

            return null;
        }
};
pForm.activateProgressBar(task);

task.setOnSucceeded(event -> {

    dialogStagee.show();

    try {

    } catch (Exception e) {

    }
    pForm.getDialogStage().close();
});

pForm.getDialogStage().show();
dialogStage.close();

Thread thread = new Thread(task);
thread.start();

运行此命令将显示“不在fx应用程序上”。通过在我的任务中添加Platform.runLater(),解决了该问题。 现在,这就是我目前的代码:

CircleTest pForm = new CircleTest();

Task<Void> task = new Task<Void>() {
    @Override
    public Void call() {
        Platform.runLater(new Runnable() {

            @Override
            public void run() {

                try {
                    FXMLLoader loader = new FXMLLoader(
                                        Main.class
                                                .getResource("/newRegistration/HomePage.fxml"));
                    AnchorPane page = (AnchorPane) loader
                                        .load();
                    dialogStagee.getIcons().add(
                                        new Image("/piks/showthumb.png"));
                    dialogStagee
                                        .setTitle("WALGOTECH SOLUTIONS: 0703445354");
                    dialogStagee
                                        .initModality(Modality.APPLICATION_MODAL);
                    Scene scene = new Scene(page);
                    dialogStagee.setScene(scene);
                    HomePageController controller = loader
                                        .getController();
                    controller.setDialogStage(dialogStagee);
                    dialogStagee.setMaximized(true);
                    dialogStagee.initStyle(StageStyle.UNDECORATED);

                    conn.prepareStatement(
                        "INSERT INTO `logs`(`date`,`user`,`Terminal`,`Action`)"
                        + " VALUES ('"
                        + (java.time.LocalDate.now()
                        + " "
                        + java.time.LocalTime.now().getHour()
                        + ":"
                        + java.time.LocalTime.now().getMinute()
                        + ":" + java.time.LocalTime.now().getSecond())
                        + "',"
                        + "'"
                        + DbConnector.getMyVariablepatientvameloginCategory()
                                                        .split("as")[1]
                        + "',"
                        + "'"
                        + StartPageController.hostname
                        + "',"
                        + " 'Logged in into Registration')")
                                        .execute();
                } catch (Exception e) {
                    e.printStackTrace();
                }   
            }
        });

        return null;
    }
};
pForm.activateProgressBar(task);

task.setOnSucceeded(event -> {

    dialogStagee.show();

    try {

    } catch (Exception e) {

    }
    pForm.getDialogStage().close();
});

pForm.getDialogStage().show();
dialogStage.close();

// dialogStage.setDisable(true);
Thread thread = new Thread(task);
thread.start();

我希望这会帮助您解决问题。干杯。