The shopping task is still daunting me, so I did something else for now. Until now it was possible to log in multiple times with the same account and even multiple times with the same character. Now I finally prevented multiple logins per account. In order to do this I added a static OnlineManager class which keeps hash-maps of all logged-in accounts and characters with their names as keys. This will also be useful for the implementation of /commands and scripts which affect characters by name.
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