Handling error / logging with asynchronous calls

Hello

I want to record each error that my app can throw. I thought it would be enough to surround the launch or method the method start with a try... catch. But it does not work like the exception.
If an error occurs during an asynchronous call, for example by clicking on a button, the exception is never caught.

You have an idea how to solve this problem?

Example:

import javafx.application.Application;
import javafx.event.ActionEvent;
import javafx.event.EventHandler;
import javafx.scene.Scene;
import javafx.scene.control.Button;
import javafx.scene.layout.VBox;
import javafx.stage.Stage;

public class TestApp4 extends Application {

    public static void main(String[] args) {
        launch(args);
    }

    public void start(final Stage stage) throws Exception {

        try {
            final VBox root = new VBox();

            Button button = new Button("Click");
            button.setOnAction(new EventHandler<ActionEvent>() {
                @Override
                public void handle(ActionEvent actionEvent) {
                    int i = 0;
                    int a = 5 / i;
                }
            });
            root.getChildren().add(button);
            Scene scene = new Scene(root);
            stage.setScene(scene);
            stage.show();
        } catch (Exception e) {
            // do logging here
            e.printStackTrace();
        }
    }
}

I'm not sure how it works 100%, but I am pretty sure is that these Exceptions in EventHandlers are intercepted by JavaFX itself inside the thread of JavaFX. They must, because if they let the exception to the top bubble, the thread of FX would end (and with it, any response in the user interface). It's probably taken at the level where the events are fired somewhere (my guess is within the QuantumToolKit).

Anyway, these exceptions are printed to System.err - if you can redirect the flow to a log file or you can have them all in one place. The error stream can be defined in your application simply by calling System.setErr ().

Note also that exceptions that occur in a task are stored in the exception property - sometimes, they can be difficult to find because they are put there in silence - you'll need to check your tasks for exceptions and print them.

Tags: Java

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Handling error / logging with asynchronous calls

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