Could it be something between localhost and 127.0.0.1 or a full hostname and address? I often met MySQL grants to be different between these and I am sure Oracle makes it even more safe. The fact that QueryTimeoutException is given seems to be more indicative or a connection problem. Can you paste the complete stack-trace? With some very clever logging adjustment I think you can even let hibernate log each of the SQL query. I doubt the very first query is something that is far from standard SQL. paul ruschhauptb wrote:
The bold error message says *User does not exists* But we are sure we used a correct connection string. Because were able to connect from the server to our Database using the same connection string via sqlplus. Our concluse is that there is a problem using the Oracle10gDialect with a 12c Oracle Database.