jar file creation in java...not that tough believ me.....

go stepwise as follow in command prompt:-

-verbose

create-->

jar -cvf  jarfilename .jar folder/filelist

manifest -->meta-inf 

extract-->

jar -xvf jarfilename.jar

running-->

specify the main class in manifest file

Main-Class: packagename.filename

attach manifest again (create jar file again with manifest)

jar  -cvfm jarfilename.jar MANIFEST.MF folder/filelist 

java -jar jarfilename.jar arguments(if any)

if main class is not inside package , place your manifest inside the folder. go to the folder and then create your jar file

if it is in package,stay out of the package , place your manifest outside the package, create jar file staying outside the package