If the url of a running atmosphere example is copied and then opened in a different tab while the old one left open in the same browser,
i.e. there are two atmosphere examples of the same url opened at the same time in a browser,
one of them will stop working.
I found the cause of this problem is that trackingPages in EventBus is using a BiMap.
If there are different tracking-ids mapping to the same PageKey, one of the map entry will be removed.
The simple solution would be replacing the BiMap with HashMap, but I think there might be reasons why BiMap is used here.