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getDimensionId() returns the dimension id - 1. So without this patch we would reuse an existing dimension id, if some other dimension was unloaded before. In Spigot this is nearly invisible because DimensionManager has no equals(), so dimension id collisions just create 2 worlds with the same dimension. The PaperWorldMap (Added in https://github.com/PaperMC/Paper/blob/master/Spigot-Server-Patches/0376-Optimize-Server-World-Map.patch ) changes this - Now the dimension is overwritten if there is some collision, what causes players to teleport to incorrect worlds, World checks will no longer work and many more evil things.
Paper 
High performance Spigot fork 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 a copy of paperclip.jar from our build server, here.
Run the Paperclip jar directly from your server. Just like old times
- Documentation on using Paper: paper.readthedocs.io
- For a sneak peak on 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
- Maven Repo (for paper-api):
<repository>
<id>papermc</id>
<url>https://papermc.io/repo/repository/maven-public/</url>
</repository>
- Artifact Information:
<dependency>
<groupId>com.destroystokyo.paper</groupId>
<artifactId>paper-api</artifactId>
<version>1.13.1-R0.1-SNAPSHOT</version>
<scope>provided</scope>
</dependency>
How To (Compiling Jar From Source)
To compile Paper, you need JDK 8, maven, and an internet connection.
Clone this repo, run ./paper jar from bash, get files.
How To (Pull Request)
See Contributing
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.