how to create a line number on table/grid - oracle adf jdeveloper

this will give a line number on af:table 
it's easy. follow this steps :

just right click on the table
add a column anywhere you need them 

on table properties, set varStatus dengan vs

on the label column properties, set value to #{vs.index+1}

thanks to Mohammad Jabr on http://mjabr.wordpress.com/2011/06/03/display-row-number-in-aftable/

error on java adf : An invalid object operation was invoked on type View Object

environment : Oracle Jdeveloper.
working page : Application Module.
problem : could not read a looping data.
troubleshoot : i check the connection, but it is fine. i re-write the view criteria, also not solving the problem.
solution : after a little search on google,  i found out that i may not close the view object connection with [view object.remove();].
and then i comment the line and whoallaa... it works fine..

i never close vo before.. but i know now that adf will automatically waste unused connection.
:)