> java.sql.SQLException: ORA-01012: not logged on This isn't a generic "not connected" error, it's an Oracle specific one, which suggests you are in fact able to connect to the database.
Googling for ORA-01012 yields a number of somewhat cryptic explinations of ORA-01012. Do you see this problem when you're not using pooling at all? If not, can you provide some details on your pooling configuration?
