BKCommonLib logo

Latest version: 1.57

CraftBukkit/SportBukkit/Spigot/MCPC+ build: CB 1.6.4 R1.0 / CB 1.6.4 R2.1 / Spigot 1.7

Older builds available: CB 1.5.2-R1.0 / CB 1.6.2-R1.0

Tekkit: Untested and thus unsupported, some features may not work as expected


This utility library shares all the common code needs for various plugins, and having them in one library heavily reduces the amount of duplicated code. The featured utilities are varied, and whenever something is missing in Bukkit, it is added in BKCommonLib. This is one of the reasons why it has become this large: there are simply a lot of things Bukkit doesn't (want to) offer.

BKCommonLib has versioning on a per-plugin basis, so when a certain plugin needs version 2, and version 1 is installed, the server owner is automatically notified and the plugin is not enabled. This prevents the common mishaps with outdated BKCommonLib versions.

Other than utilities and services, this library offers a wide variety of reflection and user-friendly ways of accessing net.minecraft.server. If your plugin requires the use of the internals, but do not want to risk changing field and method names, you can depend on BKCommonLib to provide them for you. This allows you to remain compatible between CraftBukkit versions automatically, and reduces silent failure hazards.

Reasons for you to depend on this library

  • You need to access Minecraft internals in your plugin, and Bukkit has no API for it
  • You are tired of re-uploading the same version over again because of the internals changing
  • You want to work with Vector/math logic, or need to use other utility classes
  • The YAML of Bukkit dislikes you, and you want this to be easier
  • You want to easily read and write configuration/data files
  • You want easy access to data conversion utilities to convert user input
  • You want to work with inventories in an advanced fashion
  • You want to work with unique server events
  • You want to alter entity behaviour (such as handling block collisions, custom movement, etc.)
  • You want plugin messages/permissions to be configurable
  • You want to work with (async)tasks without storing IDs
  • You want to send and manipulate packets


Getting started

To start using BKCommonLib, you have two options (after adding BKCommonLib as dependency in the plugin.yml):

Include the jar file as a dependency

Like any dependency, keep the jar file somewhere on your computer and add it to your classpath. Nothing special here.

Make a (new) maven project and include it

Add the following repository:

    <id>dj-tcraft repository</id>

And the following dependency (may need to update version):


Dependencies BKCommonLib uses

BKCommonLib supports various other plugins and projects. Below all of these are listed:

  • Vault - for permission plugin support
  • ProtocolLib - to avoid packet listening conflicts
  • Showcase(Standalone) - to ignore showcased items
  • HyperConomy - to ignore shop items
  • BleedingMobs - to ignore particles
  • CGLib - for generating nms.Entity classes on-the-fly to supply Entity Controllers
  • Objenesis - for generating classes without calling constructors (needed for various fixes inside class constructors)

Plugins that require BKCommonLib to be installed:


This plugin utilises Hidendra's plugin metrics system, which means that the following information is collected and sent to mcstats.org:

  • A unique identifier
  • The server's version of Java
  • Whether the server is in offline or online mode
  • The plugin's version
  • The server's version
  • The OS version/name and architecture
  • The core count for the CPU
  • The number of players online
  • The Metrics version Opting out of this service can be done by editing plugins/Plugin Metrics/config.yml and changing opt-out to true.


This library uses an open license. Feel free to use whatever code you need from it, you do not have to ask me either. If you want me to add certain features, that is fine too. Everyone is allowed to use this Library as a dependency. I do recommend extending 'PluginBase' instead of 'JavaPlugin' then, as it allows you to automatically deal with the BKCommonLib versioning checks. See also: BKCommonLib license file

This product includes software developed by the Apache Software Foundation (http://www.apache.org/)


BKCommonLib supports ProtocolLib when it is enabled, but if it is not, the player connection is replaced resulting in several incompatibilities. To fix these incompatibility issues, install ProtocolLib next to BKCommonLib. This can not be stressed enough. When incompatibility occurs, BKCommonLib will notify you in the console and will disable itself. The following plugins are known to be incompatible when ProtocolLib is NOT installed:


This plugin sends server count and dependency statistics to MCStats.org. You can (globally) opt out in the PluginMetrics/config.yml file.


I use a banner in my depending plugins. This banner is automatically updated when a new version of BKCommonLib is out. It is a quick and efficient way to keep track of updates for this library. This was needed, too, because a lot of people were using outdated BKCommonLib versions, which resulted in bug reports...too many of them. And I do not want to waste your time with invalid reports. You have a plugin that uses BKCommonLib? Feel free to use the banner on your download page.

[[http://dev.bukkit.org/bukkit-plugins/bkcommonlib/|{{http://ci.dj-tcraft.nl/job/BKCommonLib/lastSuccessfulBuild/artifact/target/BKCommonLibVersion.png|Go to the BKCommonLib Dev-bukkit page}}]]

Development Builds

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  • Avatar of carmeops carmeops Jan 30, 2015 at 22:39 UTC - 0 likes
    • stare intensely at giezenberg* cannot wait for 1.8
    • excitement intensify* we won't update our server without traincarts
    • staring intensify*
  • Avatar of giezenberg giezenberg Jan 27, 2015 at 21:35 UTC - 0 likes

    @sanjay900: Go

    That is only the protocol patch I suspect? Because my (not yet finished) version is with the real 1.8 spigot build.

  • Avatar of sanjay900 sanjay900 Jan 27, 2015 at 04:31 UTC - 0 likes

    @giezenberg: Go

    I removed the tab list, since i was too lazy to make a new API for it, traincarts worked fine though.

  • Avatar of FuzzyThor FuzzyThor Jan 25, 2015 at 04:19 UTC - 0 likes

    I have a 1.8 spigot and craftbukkit build that I compiled as well as a dev version of essentials. Works just fine, but the plugins that require bk lib do not work.

    When I try to compile bk it spams errors near the end with cannot find symbol.

    Last edited Jan 25, 2015 by FuzzyThor
  • Avatar of KamikazePlatypus KamikazePlatypus Jan 24, 2015 at 23:08 UTC - 0 likes

    @Swords761: Go

    Can't find anything. sanjay900's build won't compile because the BK build server is down, and spinot won't compile because IT'S build server is down, and the devs aren't too active. It's a hot mess.

  • Avatar of Swords761 Swords761 Jan 24, 2015 at 18:10 UTC - 0 likes

    @KamikazePlatypus: Go

    @GameChicken: Go

    @dentesdracula: Go

    Read the comments below yours. You might have to click the "next" button. There might be a link to a work in progress for "Spinot".



  • Avatar of KamikazePlatypus KamikazePlatypus Jan 24, 2015 at 08:20 UTC - 0 likes

    @lenis0012: Go

    Any update on Spinot and the new build server? This place looks dead.

  • Avatar of dentesdracula dentesdracula Jan 21, 2015 at 23:52 UTC - 0 likes

    Me too this is my last plugin for 1.8 ( it operates traincarts ) If you please update or compile your plugin Thank you for your very good work .

  • Avatar of GameChicken GameChicken Jan 21, 2015 at 15:13 UTC - 1 like

    please update to 1.8, its the last plugin i need to upgrade to 1.8

  • Avatar of giezenberg giezenberg Jan 17, 2015 at 10:32 UTC - 0 likes

    @jenks1999: Go

    @sanjay900 already did this. He only removed the things that were causing the crass and did not fix it, so maybe sometime I will fix this. But in the meantime you can use the fork of @sanjay900.

    Last edited Jan 17, 2015 by giezenberg


Date created
Sep 18, 2012
Last update
Oct 27, 2014
Development stage
  • enUS
GNU General Public License version 3 (GPLv3)
Curse link
Recent files
  • R: v1.59 (1.7.10) for CB 1.7.9-R0.2 Oct 27, 2014
  • R: v1.58 for CB 1.7.9-R0.1 May 21, 2014
  • R: v1.57 for CB 1.7.2-R0.2 Jan 26, 2014
  • R: v1.56 for CB 1.6.4-R2.0 Nov 17, 2013
  • R: v1.55 for 1.6.4 Sep 30, 2013