i just started jsf application , i am able to get the values from database , and i used datatable to papulate data in the from of table formate .. now i just adding one a4j command button to that table ,i.s update .. but i never receive any action from that button thats mean .. i was used ActionListner to make a call to the method with out return type ..at that time .. the method witch i writen in backing bean is not called ........

thanks........................