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Spigot drastically altered vanilla mob spawn logic and caused a few issues. 1) Used only spawnable chunks vs entire world for entity counting, resulting in ignoring other entities in the world, and causing the world to go over its intended limit. Specially with servers using smaller mob spawn ranges than view distance, as well as affects spawning API 2) Spigot was using 16x16 division instead of vanilla 17x17 division. Issues got worse in 1.9 due to more chunks being loaded due to 1.9 changes, that fall out of the monster spawn radius. This patch returns mob counting to use all loaded chunks, and 17x17 division.
Paper 
High performance Spigot fork that aims to fix gameplay and mechanics inconsistencies.
IRC Support and Project Discussion
Documentation
Access the paper docs here: paper.readthedocs.org
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 buildserver here: https://ci.destroystokyo.com/job/PaperSpigot/
Run the Paperclip jar directly from your server. Just like old times
Paper requires Java 8 or above.
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.