remove tasks from ThreadPoolTaskScheduler pool Spring

Question

I am using ThreadPoolTaskScheduler and Scheduler to create tasks, but when I set a new task I want to remove a certain one or all of them how can I do this?

    @Bean
public ThreadPoolTaskScheduler createThreadPoolTaskScheduler() {
    ThreadPoolTaskScheduler threadPoolTaskScheduler = new ThreadPoolTaskScheduler();
    threadPoolTaskScheduler.setPoolSize(10);
    threadPoolTaskScheduler.setThreadNamePrefix(threadPrefix);
    threadPoolTaskScheduler.initialize();
    return threadPoolTaskScheduler;
}

Adding the tasks:

private final Scheduler scheduler;
private ThreadPoolTaskScheduler threadPoolTaskScheduler;
public void addTask(){
    FixedRateTask update = new FixedRateTask(this::executeOnRateMethod
            , initialDelay, waitTime);

    taskRegistrar.setTaskScheduler(threadPoolTaskScheduler);
    scheduler.setTask(taskRegistrar.scheduleFixedRateTask(update));
}

It seems that calling:

taskRegistrar.setTaskScheduler(threadPoolTaskScheduler);
taskRegistrar.scheduleFixedRateTask(update);

Adds threads to the pool everytime, Also canceling the scheduler is not working:

scheduler.getTask().cancel();

Answer 1

When you scheduled a future ScheduledFuture<?> will be returned.The ScheduledFuture<?> has scheduledFuture.cancel(false), it will cancel the scheduled task, which you have placed in the executor.