Adding a new EJB jar file

I was trying to make a small ejb application work. I made a jar file called Inventory.jar as said in the training documentation(JGURU inro to EJB). I get an error saying that it is not a valid EJB jar file. Any ideas.
[224 byte] By [vdittakavia] at [2007-9-28 18:32:21]
# 1
Did you use the EJB compiler to generate your stubs and skeletons?
cknelsena at 2007-7-12 16:32:15 > top of Java-index,Other Topics,Patterns & OO Design...
# 2
This is what is given in JGURU steps: jar cvf MusicCD.jar musicstore\*.class META-INF\ejb-jar.xml I am using Tomcat apache.Thanks Venkat
vdittakavia at 2007-7-12 16:32:15 > top of Java-index,Other Topics,Patterns & OO Design...
# 3
After that use ejb compilation and make jar once again and deploy.In the case of Weblogic ejbc is the command.
pv_ramana at 2007-7-12 16:32:15 > top of Java-index,Other Topics,Patterns & OO Design...