First you have to export current
java (import archive).
1. create new java project.
2. import this jar file into this.
3. you will see the new java file and class files also.
4. it shows error on project , whenever you open java file.
( missed external files, or refering lib files)
( add these files in javabuild path again).
Now start export.
How to verify, if my new jar files has class file or not
just rename new jar file, with *.zip file
open in win zip
check if java and class file is there or not.