Question

I am unable to understand the reason behind the error.I want to convert .class file to jar file,

on dos i write :

java cf myjar.jar *.class

but here is what i get in return:

Error: Could not find main class cf
Exception in thread “main”
java.lang.NoClassDefFoundError: cf
—and goes on,,,,

Why i am getting this error and what is it?

Answer 1

You’re running the wrong command – java instead of jar. That’s why it’s treating cf as a class name.

You want:

jar cf myjar.jar *.class