JavaFX : Use a Thread more than once

Question

I\'m new with JavaFX and I\'ve a little problem with a thread: I can execute it twice and I can\'t find why.

Here is a sum-upt of my code:

Task

        

Answer 1

From the Thread.start() documentation : No

It is never legal to start a thread more than once. In particular, a thread may not be restarted once it has completed execution.

From the Concurrency in JavaFX tutorial :

The Task class defines a one-time object that cannot be reused. If you need a reusable Worker object, use the Service class.

So, you have to consider the Service class rather than Task.

---

Edit: this should work for you:

Service service = new Service<>(task);

//Updated use this to create a new Service object instead
    Service service = new Service() {
    @Override
    protected Task createTask() {
        return new Task() {
            @Override
            protected Void call() throws Exception {
                //Your codes here
                return null;
            }
        };
    }
};

@FXML protected void launch(ActionEvent event){
     if (!service.isRunning()) {
        service.reset();
        service.start();
    }
}