Welcome to L2J Server Project
L2J Server is an open-source server emulator fully written in Java for the famous Korean MMORPG.
This page only gives very basic information, for the detailed information about building and developing L2J Server, please visit the developers forums.
We have worked with Eclipse for over 10 years, recently we decided to give a try to JetBrain's IntelliJ IDEA IDE and they have been kind enough to give us licenses for the Ultimate version.
We will continue to support Eclipse, but also give support for IntelliJ IDEA users.