How to access an action's Due Date through the GP API

Question

I'm new to the GP API, and I would like to know how can I get/set an action's due date and notifications at runtime.
Is it possible to create new actions and attach them to a process?
Thanks in advance

Answer 1

Thanks for your reply. You know? I already looked at those documents before, but I couldn't find the right API to acomplish my requirement.
What I've found over and over is how to retrieve the notifications belonging to the process. But these are not the notifications that I need. Like the post's title reads, I need the <i>Activities/Actions</i> notifications.
I read there's a method in the <i>NotificationManager</i> API to do so, but so far I've only manage to get a <i>NullPointerException</i>
Here's the code:
String processId = executionContext.getProcessId();
String activityId = executionContext.getTaskId();
IGPNotificationInstance notificationInstance =
        ntfm.retrieveNotification(
                processId, activityId, notifId);
String idNotificacion = "";
if (notificationInstance != null) {
    deadline = notificationInstance.getDeadline();
The notification ID comes from watching the faulty notifications in the queue manager (so it's hard-coded)
It doesn't matter what property/method I try to access from the <i>notificationInstance </i>object. I get a <i>NullPointerException</i>.