No subscribers registered for event class org.greenrobot.eventbus.NoSubscriberEvent

[artem1989]

 @Override
    public void onStart() {
        super.onStart();
        EventBus.getDefault().register(this);
    }

 @Override
    public void onStop() {
        EventBus.getDefault().unregister(this);
        super.onStop();
    }

// post object from Activity
ByteImage msg = new ByteImage();
EventBus.getDefault().postSticky(msg);

// subscriber placed in other module
@Subscribe(sticky = true, threadMode = ThreadMode.MAIN)
   public void writeImage(ByteImage image) {
        write(image); // not invoked after app back from background to foreground
 }

When app just started everything works perfectly but after app goes to background and then back to foreground: No subscribers registered for event class org.greenrobot.eventbus.NoSubscriberEvent for event class ByteImage. Register and unregister called as intended.

[greenrobot-team]

Maybe your event is fired before your activity/fragment is started or after it is stopped? -Uwe

[xianfeng92]

1. When your app goes to background and then back to foreground, current Activity is the activity you register eventBus?
2. When your app goes to background and then back to foreground, you register EventBus by onStart, but when you post object from Activity ?