Yesterday I encountered a problem with the minecraft server version 1.7.2 and 1.7.4. When a specific user was logging in, the memory use of the minecraft service raised to 100% of the available memory and the server started swapping. This causes a very slow responding server and all the players where disconnected because of a timeout. Every time this users logs in this problem occurs. After some searching I found out it has something to do with the installed java version.
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