https://stackoverflow.com/questions/1342894/find-a-class-somewhere-inside-dozens-of-jar-files
for i in *.jar; do jar -tvf "$i" | grep -Hsi ClassName && echo "$i"; done
or
find path/to/libs -name '*.jar' -exec grep -Hls ClassName {} \;
for /R %G in (*.jar) do @jar -tvf "%G" | find "ClassName" > NUL && echo %G