jdbc problems with oracle 8i

[Bhasker Reddy]

We upgraded to Oracle 8i and we are unable to connect to database. Before we had oracle 8.0.5.
We used classes111.zip for oracle driver. Now we are using classes12.zip. We are unable to connect to database.
Do you guys have any idea what could be wrong.
Let me know if i am not clear. I will try to explain the situation again.
Creating the connection for first time
DB Connection failed. System Error Message: java.sql.SQLException: Message [TTC0000] not found in 'oracle.jdbc.dbaccess.Messages'.

A connection to the database could not be established. java.sql.SQLException: Message [TTC0000] not found in 'oracle.jdbc.dbaccess.Messages' Object type ServiceOrder, A connection to the database could not be established. java.sql.SQLException: Message [TTC0000] not found in 'oracle.jdbc.dbaccess.Messages'. There was a failure in updating your request