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README.md



Native Minecraft Servers that use GraalVM Native Image



The Minecraft server is known to consume a lot of memory and CPU resources and can be hard to deploy. This project makes it possible to convert the Minecraft server into an independent executable that is self-contained with the help of GraalVM Native Image. This means it should use fewer CPU and memory resources, have faster startup times, and be easier and cheaper to deploy.



A native Minecraft server is less than 120MB in size and, with that, significantly smaller than Minecraft's server.jar and a JDK required to run it. With upx compression the size of the native executable could be reduced further to less than 40MB which is smaller than just the server.jar. Initial tests also showed a competitive run-time and a smaller footprint of memory. Create using GraalVM Enterprise native images for best results. This gives you higher performance and lower usage of memory than the Community Edition. Minecraft Servers Also, test the G1 GC or Profile-Guided Optimizations. The Oracle Cloud Free Tier not only offers four Ampere A1 cores and 24GB of RAM, which is plenty to host a Minecraft server and also provides access to GraalVM Enterprise.



For more details, read this blog post.



Disclaimer This project is intended to be a demonstration only and designed to help the Minecraft community to evaluate the use of GraalVM Native Image. Use at your own risk.



1. Download GraalVM Community or Enterprise (GraalVM 22.2.0 or later is required). Optional: make sure that upx is on your $PATH to enable compression. 2. Go to the repository and download it. Then run build.sh. 3. Launch the native Minecraft server with ./native-minecraft-server. The first time you run the server, you'll have to follow the regular procedure of accepting Minecraft's EULA.



How does it work



This project is only the build.sh script and the reachability metadata for creating a native Minecraft server. The build.sh script first downloads Minecraft's server.jar and then extracts jars and other resources from it. Then, it calls GraalVM Native Image using the correct configuration to create an native version of the Minecraft server. If upx is present on the $PATH, the script will compress the native executable.



Limitations and Issues



- The configuration currently only is compatible with Minecraft 1.18.2. The server GUI is not yet supported. Mods aren't supported at the moment. There isn't yet a build script available for Windows but the WSL should be able to work. - The native executable sometimes fails on startup. It is typically possible to restart it multiple times. Error: com.mojang.datafixers.types.templates.List$ListType cannot be cast to java.lang.Comparable.


Here's my website: https://minecraftservers.quest/