@Eliezer Welch the command you are looking for is "jar" these are just zip files with a special extension. 'jar' options mirror tar.
You will want to scan the folder and then open the listing of each jar file and scan for your class.
on Linux: ls *.jar | while read file; do jar tvf $file | grep -i vfsresolver; [[ $? == 0 ]] && echo $file; done