Bukkit/CraftBukkit-Bleeding — comment on commit eeda92e38de3eccde9c3043bac3f343b8ca557a0
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By Cogito:

This thread is run on the shutdown event thrown by the JVM. It is used to catch the application in the case it crashes etc, but is also thrown when the application shuts down normally. We are already shutting down normally, and then this was causing us to shut down again. Stopping that is the purpose of this series.