Installation - Windows systems

Install JDK 25

Download the JDK 25 MSI from the link above and run the installer with defaults.

Download and extract Eclipse

Preferably to C:\eclipse\ and set the workspace to C:\eclipse\workspace.

At this point make sure Eclipse is using the right Java version: Window → Preferences → Java → Installed JREs. If your JDK 25 install folder isn't listed, add it with the Add... button.

Enable Eclipse Git support

1. Open Eclipse.
2. Click the top menu item Window.
3. Select Show View.
4. Click Other....
5. From the Git folder select Git Repositories.

Check out the project

1. In the Git Repositories view, click Clone a Git repository.
2. URI: https://gitlab.com/MobiusDevelopment/L2J_Mobius.git
3. Click Next > twice.
4. Directory: C:\eclipse\workspace\L2J_Mobius
5. Click Finish and wait for the clone to complete.
6. Double click L2J_Mobius [master], then Working Tree.
7. Right click any project → Import Projects... → Finish.

If you get "JRE System Library [JavaSE-25]" warnings, re-add JDK 25 from Window → Preferences → Java → Installed JREs.

Compile the project

1. In the Package Explorer, expand the project to find build.xml.
2. Right click build.xml → Run as... → 1 Ant Build.
3. Wait for the BUILD SUCCESSFUL console message.
4. Find your compiled L2J_Mobius.zip in C:\eclipse\workspace\L2J_Mobius\build.

Install XAMPP

Download and install XAMPP from the link above. The L2JMobius database runs on the MySQL service that ships with it.

Install the MySQL service

1. Go to C:\xampp.
2. Run xampp-control (the one with the orange icon).
3. Click the X button next to MySQL.
4. Click Yes to install it as a Windows service.
5. Use the Start button to launch the service.

Run the server

1. Extract your compiled L2J_Mobius.zip to a folder. Preferably C:\L2J_Mobius.
2. Go to db_installer and run DatabaseInstaller.vbs to install the schema.
3. Go to login and run LoginServer.vbs.
4. Go to game and run GameServer.vbs.