Jar File that contains BaseController.Class

Hi there,

I'm writing a my own custom plugin where I need to write my own Controller for which I need extend "BaseController", I order to import
"jetbrains.buildServer.controllers.BaseController" I don't find this Class file in any Jar. I searched under ]]>/WEB-INF/lib directory.

Please let me know in which Jar file I can find the BaseController.Class file.
I will appreciate your help.

Thanks,
Vinay