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In the case where multiple messages from different players are being processed in parallel, there was a potential race condition where the messages would be sent to the client in a different order than the message signature cache was updated. However, the cache relies on the fact that the client and server get the exact same updates in the same order. This race condition would cause the caches to become corrupted, and any future message received by the client would fail to validate. This also applies to the last seen state of the server, which becomes inconsistent in the same way as the message signature cache and would cause any messages sent to be rejected by the server too. |
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| build-data | ||
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| licenses | ||
| paper-api-generator | ||
| patches | ||
| scripts | ||
| test-plugin | ||
| work | ||
| .editorconfig | ||
| .gitattributes | ||
| .gitignore | ||
| .gitmodules | ||
| build.gradle.kts | ||
| CONTRIBUTING.md | ||
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| LICENSE.md | ||
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Paper 
The most widely used, high-performance Minecraft server that aims to fix gameplay and mechanics inconsistencies.
Support and Project Discussion:
How To (Server Admins)
Paperclip is a jar file that you can download and run just like a normal jar file.
Download Paper from our downloads page.
Run the Paperclip jar directly from your server. Just like old times
- Documentation on using Paper: docs.papermc.io
- For a sneak peek at upcoming features, see here
How To (Plugin Developers)
- See our API patches here
- See upcoming, pending, and recently added API here
- Paper API javadocs here: papermc.io/javadocs
Repository (for paper-api)
Maven
<repository>
<id>papermc</id>
<url>https://repo.papermc.io/repository/maven-public/</url>
</repository>
<dependency>
<groupId>io.papermc.paper</groupId>
<artifactId>paper-api</artifactId>
<version>1.21.1-R0.1-SNAPSHOT</version>
<scope>provided</scope>
</dependency>
Gradle
repositories {
maven {
url = uri("https://repo.papermc.io/repository/maven-public/")
}
}
dependencies {
compileOnly("io.papermc.paper:paper-api:1.21.1-R0.1-SNAPSHOT")
}
java {
toolchain.languageVersion.set(JavaLanguageVersion.of(21))
}
How To (Compiling Jar From Source)
To compile Paper, you need JDK 21 and an internet connection.
Clone this repo, run ./gradlew applyPatches, then ./gradlew createMojmapBundlerJar from your terminal. You can find the compiled jar in the project root's build/libs directory.
To get a full list of tasks, run ./gradlew tasks.
How To (Pull Request)
See Contributing
Support Us
First of all, thank you for considering helping out, we really appreciate that!
PaperMC has various recurring expenses, mostly related to infrastructure. Paper uses Open Collective via the Open Source Collective fiscal host to manage expenses. Open Collective allows us to be extremely transparent, so you can always see how your donations are used. You can read more about financially supporting PaperMC on our website.
You can find our collective here, or you can donate via GitHub Sponsors here, which will also go towards the collective.
Special Thanks To:
YourKit, makers of the outstanding java profiler, support open source projects of all kinds with their full featured Java and .NET application profilers. We thank them for granting Paper an OSS license so that we can make our software the best it can be.
JetBrains, creators of the IntelliJ IDEA, supports Paper with one of their Open Source Licenses. IntelliJ IDEA is the recommended IDE for working with Paper, and most of the Paper team uses it.
All our sponsors!
