jar from a different folder

Hi ,
i use below command to create a jar from /home/surya
jar -cvf foldername.jar jarfolderpath
foldrename.jar= directorywhere jar file needs to be created including jar file name

jarfolderpath: directory which needs to be included to create a jar

Now taking below scenario:
foldername.jar - /home/surya/xyz/jars/test.jar
jarfolderpath = /home/surya/classes/com

the jar that gets created is containing all jars starting from folder /home/surya/classes/com. But I need the jar need to contain from "com" (within /home/surya/classes) only..ie. within jar it should start from "com"
Please let me know for any clarificaiton/

Surya

jar cvf ~/xyz/jars/test.jar -C ~/classes/ com