Axis2 Service Archiver java.lang.NoClassDefFoundError

Problem:
When running the Axis2 Service Archiver, I got the following error: java.lang.NoClassDefFoundError



Solution:
1. Close Eclipse.
2. Open an explore window and navigate to your workspace. Under your workspace folder, open .metadata folder and then open .plugins folder, and then open the Axis2_Service_Archiver folder. Now you should see a file called "dialog_settings.xml", delete that file.
3. Restart Eclipse.

Looks like Eclipse cashed plugin related information in that xml file. If something is wrong in that xml file, you'll get this error.