I wanted to start debugging my new plugin and followed this tutorial here: http://forums.bukkit.org/threads/debugging-plugins-in-eclipse.4043/ Now when I run the program in eclipse, the console shows nothing but the following: Code: Loading libraries, please wait... 2014-05-16 15:01:01,645 WARN Unable to instantiate org.fusesource.jansi.WindowsAnsiOutputStream It seems to freeze at this point. To my surprise, the server itself works just fine, I can join it and even stop it via the eclipse console. This tutorial has already worked for me years ago when I did my first plugin, I can't remember doing anything else back then. I use bukkit and craftbukkit 1.7.9-R0.1, if there is anything else you need to know, let me know. Update: I figured out that the problem only occurs with craftbukkit versions that are 1.7.x Any earlier verions work fine.