how to package jar easily with find command

Eclipse jar packing function isn't very easy and comfort to use. Sometimes the packaged jar does not include some classes.

we can use find and jar command to make a jar package easily:
assume $project is where your project located, and bin is the output directory.
com.xxx.yyy is the parent package of the project.

cd $project/bin
find ./com  > classlist  (or find ./com -name *.class if you have .cass files only)
jar -cvf project.jar @classlist