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Here you can download a decomplied version of craftbukkit. And this is only for making a new server plugin loader based on craftbukkit that is legal or a plugin that loades in bukkit plugin.
Complete jar name: craftbukkit-1.8.8-R0.1.jar.
I will not post the original jar file.
IF RECOMPLIED THIS LINK WILL BE REMOVED UNTIL SURE THAT THE FILE IS NOT LONGER BE USED FOR RECOMPLIED USE OR PERMANTENTE REMOVED.
Minecraft mod developer. I will always answer pm's.