SQLException: No suitable driver found for jdbc:derby

[shotokanpoloto]

I've got this exception after running my project
Really don't know what to do!
SQLException: No suitable driver found for jdbc:derby://localhost:1527
I've add derbyclient.jar to Library.but I didn't get any different result.I also don't want to create a new database.
I wasn't able to attach it here but here are two links to download project files.
source:
http://bia2internet.com/dl/java/java.zip
database:
http://bia2internet.com/dl/java/db.zip

[mvmalderen]

Have you tried connecting to your database using the Netbeans Services tab? This should work before you proceed.

[shotokanpoloto]

Yes I'm able to see tables too...but still this exception appear after running project.

[mvmalderen]

Yes I'm able to see tables too...but still this exception appear after running project.

Hmm, that's odd, because I managed to get it to work (although I had to change the persistence provider).
Have you tried (re)generating the persistence.xml file using the NetBeans wizard?

[shotokanpoloto]

No what should I do with it?!