protected void runQueuedTasks() {
        AppTask<?> task;
        while( (task = taskQueue.poll()) != null ) {
            if (!task.isCancelled()) {
                task.invoke();
            }
        }
    }
Runs tasks enqueued via {@link #enqueue(Callable)}
jme3-vr/src/main/java/com/jme3/app/VRApplication.java