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Oracle® Application Server TopLink Application Developer's Guide
10g Release 2 (10.1.2)
Part No. B15901-01
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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".