How Read xlsx file in Hyris

Hi All, I have a requirement to read xlsx file and create impex file. I use Apache POI in standalone mode in Java project and able to read xlsx file ,but i am not able to read xlsx file in Hybris...I included all jar file related to Apache POI in Build path.

I create a extension, inside that we write a class contains main() method.and also write a cunstome class inside that class we write code for read xlsx file and call that class from main(). Please help....

Regards Davendra