Custom packet extensions/iq packets with spark

i’‘ve a general question … if i build my own extensions & a client with smack i’'ve to put my own smack.provider in the META-INF directory of my jar file.

now if i build a plugin for spark that uses custom extensions do i have to place the smack.provider to the META-INF of my plugin.jar or is there another mechanism for loading custom extensions?

i found anything in the documentation and i found no single smack.providers in any plugin i watched.