Below are the sample commands to find out required class is there in the jar files of current directory and its sub-dirs.

Unix : 

find . -type f -name '*.jar' -print0 |  xargs -0 -I '{}' sh -c 'jar tf {} | grep com/sun/net/ssl/HostnameVerifier.class &&  echo {}'
find . -type f -name '*.jar' -print0 |  xargs -0 -I '{}' sh -c 'jar tf {} | grep HostnameVerifier.class &&  echo {}'
Ex :
[kg6378@bldv0014 jdk1.6.0_20]$ find . -type f -name '*.jar' -print0 |  xargs -0 -I '{}' sh -c 'jar tf {} | grep com/sun/net/ssl/HostnameVerifier.class &&  echo {}'
com/sun/net/ssl/HostnameVerifier.class
./jre/lib/jsse.jar

[kg6378@bldv0014 jdk1.6.0_20]$ find . -type f -name '*.jar' -print0 |  xargs -0 -I '{}' sh -c 'jar tf {} | grep HostnameVerifier.class &&  echo {}'
com/sun/deploy/security/CertificateHostnameVerifier.class
./jre/lib/deploy.jar
javax/net/ssl/HostnameVerifier.class
javax/net/ssl/HttpsURLConnection$DefaultHostnameVerifier.class
sun/net/www/protocol/https/DefaultHostnameVerifier.class
com/sun/net/ssl/HostnameVerifier.class
./jre/lib/jsse.jar

Windows : 


forfiles /S /M *.jar /C "cmd /c jar -tvf @file | findstr /C:"HostnameVerifier.class" && echo @path"


C:\Users\kg6378\Desktop\jdk-7u79-windows-x64\tools>cd C:\Krish\MyDocs\SWS\Jdk1.6
.0_14

C:\Krish\MyDocs\SWS\Jdk1.6.0_14>forfiles /S /M *.jar /C "cmd /c jar -tvf @file |
 findstr /C:"HostnameVerifier.class" && echo @path"

  3517 Thu May 21 09:19:20 EDT 2009 com/sun/deploy/security/CertificateHostnameV
erifier.class
"C:\Krish\MyDocs\SWS\Jdk1.6.0_14\jre\lib\deploy.jar"
   194 Thu Feb 05 13:54:20 EST 2009 javax/net/ssl/HostnameVerifier.class
   618 Thu Feb 05 13:54:22 EST 2009 javax/net/ssl/HttpsURLConnection$DefaultHost
nameVerifier.class
   384 Thu Feb 05 13:54:22 EST 2009 sun/net/www/protocol/https/DefaultHostnameVe
rifier.class
   272 Thu Feb 05 13:54:32 EST 2009 com/sun/net/ssl/HostnameVerifier.class
"C:\Krish\MyDocs\SWS\Jdk1.6.0_14\jre\lib\jsse.jar"

C:\Krish\MyDocs\SWS\Jdk1.6.0_14>