Java¶
Java Versions¶
| Minecraft | Download Page | Linux Shell Command |
|---|---|---|
| <= 1.15 | Java 8 | sudo apt install openjdk-8-jdk |
| 1.16 | Java 8 OR Java 11 | sudo apt install openjdk-11-jdk |
| 1.17 | Java 16 | sudo apt install openjdk-16-jdk |
| 1.18+ | Java 17 | sudo apt install openjdk-17-jdk |
| 1.21+ | Java 21 | sudo apt install openjdk-21-jdk |
On the download page sort for your Operating System and your Architecture (This should typically be x64)
Other Java Download Links
Java Arguments¶
These can help both server and client with performance in,
- Reducing Ram Usage. (GC will clean up more efficiently)
- Reduced Lag Spikes. (GC will clean more frequently, reducing large lag spikes)
Client Arguments¶
These can be set in your Launcher
Curseforge Launcher
If you’re using the Curseforge Launcher, open your Settings, choose Minecraft and scroll down to these Settings. 
ATLauncher
Open your pack Settings, click Java/Minecraft and put your args into the big Java Parameters box. 
Default Java 8-11 Client Arguments
-XX:+UseG1GC -XX:+ParallelRefProcEnabled -XX:MaxGCPauseMillis=200 -XX:+UnlockExperimentalVMOptions -XX:+DisableExplicitGC -XX:+AlwaysPreTouch -XX:G1NewSizePercent=30 -XX:G1MaxNewSizePercent=40 -XX:G1HeapRegionSize=32M -XX:G1ReservePercent=20 -XX:G1HeapWastePercent=5 -XX:G1MixedGCCountTarget=4 -XX:InitiatingHeapOccupancyPercent=15 -XX:G1MixedGCLiveThresholdPercent=90 -XX:G1RSetUpdatingPauseTimePercent=5 -XX:SurvivorRatio=32 -XX:+PerfDisableSharedMem -XX:MaxTenuringThreshold=1 -Dusing.aikars.flags=https://mcflags.emc.gs -Daikars.new.flags=true
Default Java 17+ Client Arguments
-XX:+UnlockExperimentalVMOptions -XX:+UseG1GC -XX:G1NewSizePercent=20 -XX:G1ReservePercent=20 -XX:MaxGCPauseMillis=50 -XX:G1HeapRegionSize=32M
Default Java 21 Client Arguments
-XX:+UnlockExperimentalVMOptions -XX:+UseG1GC -XX:G1NewSizePercent=20 -XX:G1ReservePercent=20 -XX:MaxGCPauseMillis=50 -XX:G1HeapRegionSize=32M
Java 21 Client Arguments | If you have lots of ram (12GB+), try ZGC
-XX:+UseZGC -XX:+ZGenerational -XX:+DisableExplicitGC -XX:+AlwaysPreTouch -XX:+PerfDisableSharedMem -XX:+UseDynamicNumberOfGCThreads
Server Arguments¶
These are set in the user_jvm_args.txt file in your server folder
Default Java Server Arguments
-Xms4G -Xmx6G -XX:+UseG1GC -XX:+ParallelRefProcEnabled -XX:MaxGCPauseMillis=200 -XX:+UnlockExperimentalVMOptions -XX:+DisableExplicitGC -XX:+AlwaysPreTouch -XX:G1NewSizePercent=30 -XX:G1MaxNewSizePercent=40 -XX:G1HeapRegionSize=8M -XX:G1ReservePercent=20 -XX:G1HeapWastePercent=5 -XX:G1MixedGCCountTarget=4 -XX:InitiatingHeapOccupancyPercent=15 -XX:G1MixedGCLiveThresholdPercent=90 -XX:G1RSetUpdatingPauseTimePercent=5 -XX:SurvivorRatio=32 -XX:+PerfDisableSharedMem -XX:MaxTenuringThreshold=1
Java Server Arguments | For fast CPUs with 4+ cores & lots of ram (8-12GB), try ZGC:
-Xms8G -Xmx12G -XX:+UseZGC -XX:+ZGenerational -XX:SoftMaxHeapSize=10g -XX:+DisableExplicitGC -XX:+AlwaysPreTouch -XX:+PerfDisableSharedMem -XX:+UseDynamicNumberOfGCThreads