and how to create bauble.

IDEA: File->Project Structrue->Libraries->[+](create a lib)->[+](attach files or dirs to lib 'xxx')->[OK]
Eclipse: (right click your project)->Properties->Java build path->Libraries->Add external jar->..........->[Apply and close]

Create baubles: class NewBauble implements baubles.api.IBauble

Thanks!

This structure also works:
https://github.com/Frontrider/thaumic_arcana