grouperClient uses forked versions of certain libraries, This may have been to make it an executable jar? It's not clear what versions the code bases are from, and whether they have been modified from the original source. Without knowing the versions, it's not easy to know whether there are bugs or vulnerabilities in them.
These libraries are in package edu.internet2.middleware.grouperClientExt:
There are other options for how to package a runnable jar with external dependencies. It would be easier for maintenance and better for security to switch to one of these options for these libraries.