Unable to connect to the Discoverer Server: null..

Unable to connect to the Discoverer Server (10g or Higher):


Could not initialize class

oracle.disco.model.xml.ModelElementToClassMapper

Please contact your Oracle Application Server administrator
 
Solution:
Clear the temporary internet files and cookies and java cache


Steps to clear java cache:



1.Go to Start > Settings > Control Panel and click the Java icon.

2. Click on 'Settings'
3. Delete files

4. Close all browsers

5.Open new browser and test it
 
OR 
close all browsers and delete all files from "C:\Users\<>\AppData\LocalLow\Sun\Java\Deployment\cache".
 
 
(<> replace this with your windows login name)