Java APIs

caught Java.lang.classnot found Exception: com.sun.comm.linuxdriver while loading com.sun.comm.linuxdriver in linux

when i am running my java programs am getting this exception for resolving this i did all possiblity of putting

Comm.jar , javax.comm.properties , RXTXcomm.jar , librxtxSerial.so , libLinuxSerialParallel.so

in all directories and folder of

usr / lib
jdk folder
and even into current directory of my java program

but then also i am getting this error.. what to do now coz of this my work is stuckd

please help me

thanks in advance.