> The following code doesn't work
> (org.firebirdsql.jdbc.FBDriverNotCapableException):
> contactsRowSet1.updateRow();
> contactsRowSet1.commit();
>
> So, how can I perform insert our update data ?

I suspect that RowSet implementation tries to use updatable result sets.
This feature is not yet supported (it is not directly supported by Firebird,
so we have to provide some "workaround" here).

Does that implementation support inserting or updating rows via SQL
statements?

Roman