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README.md



Native Minecraft Servers with GraalVM Native Image



The Minecraft server is known to use lots of memory and CPU and can be difficult to deploy. This project makes it possible to compile 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 time to start, and also be less expensive and easier to deploy.



A native Minecraft server is less than 120MB in size and is 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 smaller than just the server.jar. Initial tests also showed a competitive run-time and a smaller footprint for memory. Build with GraalVM Enterprise native image for best results. This will give you better performance and lower usage of memory than the Community Edition. Also, try the G1 GC or Profile-Guided Optimizations. The Oracle Cloud Free Tier not only comes with four Ampere A1 cores and 24GB of RAM always free that is enough for hosting a Minecraft server and also provides access to GraalVM Enterprise.



For more details, read this blog post.
Yurock


Disclaimer This project is intended to be a demonstration only and intended to assist the Minecraft community 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: 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 will have to follow the regular procedure of accepting Minecraft's EULA.



How It Works



This project only contains the build.sh script and reachability metadata for building 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 with the correct configuration to create an native version of the Minecraft server. Finally, and only if upx is in the $PATH, the script will compress the native executable.



Limitations and issues that are known



The configuration currently supports Minecraft 1.18.2. The server GUI is not yet supported. Mods aren't currently supported. There isn't a build script for Windows yet, however the WSL should work. The native executable often fails on startup. It is generally possible to restart it multiple times. Error: com.mojang.datafixers.types.templates.List$ListType cannot be cast to java.lang.Comparable.


Homepage: https://yurock.net/