Find a specific class by classname in a directory or directories of jars

find . -name '*.jar' | xargs -I {} jar tvf {} | grep ProviderImpl

debug opts

export JAVA_OPTS="-Xrunjdwp:transport=dt_socket,address=4040,server=y,suspend=n -Xms1536m -Xmx1536m -XX:PermSize=1024m -XX:MaxPermSize=2048m"