Add a task to a vApp or other entity (vCD Java SDK)

I am experimenting with customizing a vApp and my goal is to have the vApp user wait while I am making these changes to the vApp.  It seems like adding a custom task to the vApp's TaskList would be the best way to do this.   The user can wait on this task and then use the vApp when I indicate that the task is done.

1) How do I add a task to a vApp's task list?

2) What is the correct way to signal that the task is done?  i.e., the user unblocks from a waitForTask() on that task

For adding the task, I've tried something like:

// Add a new task to the list
TaskType myTaskType = new TaskType();
myTaskType.setDescription("My Test Task");
myTaskType.setName("my test description");
myTaskType.setOperation("my test operation");
myTaskType.setOwner(myVapp.getReference()); 
TasksInProgressType tasksInProgressType = new TasksInProgressType();
tasksInProgressType.getTask().add(myTaskType); 
Vapp.getVappByReference(vcloudClient, myVapp.getReference()).getResource().setTasks(tasksInProgressType); 

But I think I am on the wrong track here.

Any pointer would be much appreciated.

Thanks!