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L2J Server is an open-source server emulator fully written in Java for a famous Korean MMORPG.

L2J Server is divided into two components, the L2j Game Server and the L2j Login Server, at the same time, the L2j Game Server is divided into Core and Datapack, the Core is the Java code that defines the game mechanics, persistence, and communication mechanics, and the Datapack is composed by all the files that are related to the gameplay such as dialogs, quest scripts, AIs, etc.