Exception Handling

Most exceptions in queries are database exceptions, resulting from a failure in the database operation. Write operations can also throw an OptimisticLockException on a write, update, or delete operation in applications that use optimistic locking. To catch these exceptions, execute all database operations within a try-catch block.

{
    try {
        Vector employees = session.readAllObjects(Employee.class); 
        } 
    catch (DatabaseException exception) {
        // Handle exception 
        }
}

For more information about exceptions in a OracleAS TopLink application, see Appendix C, "Troubleshooting".