Required JAR's for developing custom adapter modules for PI 7.31 SP 09

Hello experts,

I have a new development wherein i have to consume .xlsx files in PI 7.31

i have gone through a lot of blogs but did not find any relevant JAR's specially for PI 7.31, I am planning  to go for custom module development for conversion of .xlsx file into xml

so need your help for finding the JAR's for PI 7.31 and also some custom JAVA source code for conversion of excel spreadsheet into XML.

Regards,

Sushant.Shinde