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Native Minecraft Servers that use GraalVM Native Image



The Minecraft server is known to use a lot of CPU and memory resources and can be difficult to install. This project allows you to transform the Minecraft server into a native executable with GraalVM. As such, it is expected to use less resources in terms of memory and CPU, provide better startup times, and be easier and cheaper to deploy.



A native Minecraft server is smaller than 120MB and, with that, significantly smaller than Minecraft's server.jar along with a JDK required to run it. With upx compression it is possible to reduce the size of the native executable may be reduced to less than 40MB, which is less than the server.jar. Initial tests also showed competitive run-time performance and a smaller footprint of memory. Build with GraalVM Enterprise native image for best results. This gives you better performance and lower memory consumption than the Community Edition. Also, try the G1 GC or Profile-Guided Optimizations. The Oracle Cloud Free Tier not only provides four Ampere A1 cores and 24 GB of RAM that is always free that's enough to host a Minecraft server, but also free access to GraalVM Enterprise.



For more information, see this blog post.



Disclaimer This project is intended for demonstration purposes only. It's meant to assist the Minecraft community assess 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: Ensure that upx is installed 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 be required to follow the normal procedure of accepting Minecraft's EULA.



How it works



This project contains only the build.sh script and the reachability metadata to build a native Minecraft server. The build.sh script downloads Minecraft's server.jar first and extracts the jars from it. It then invokes GraalVM native image with the correct configuration to create a native Minecraft server. In the end, if upx is in the $PATH the script will compress native executable.



Limitations and known issues



The configuration currently supports Minecraft 1.18.2. - The server GUI has not been supported at this time. - Mods are currently not supported. There isn't a built script for Windows yet, however the WSL should be able to work. Sometimes the native executable is unable to start. Extrema It is generally possible to restart it several times. Error: com.mojang.datafixers.types.templates.List$ListType cannot be cast to java.lang.Comparable.


Here's my website: https://extrema.org/