Extending the Controller class OrderLinesTableRNCO

Hi,
My requirement is to enable 2 attribute columns on po lines summary table if a attribute1 on po header is Y else disable both of them.
I am writing trying to do this in the Controller class on the PO Lines summary table ( this is a advanced table). First i am just trying to get a handle on the messageinputlov column. IF this works then I will get a hangle to the po header column and will enable/disable based on its value.
My code is
package xxpb.oracle.apps.po.webui;
import oracle.apps.fnd.common.VersionInfo;
import oracle.apps.fnd.framework.webui.OAControllerImpl;
import oracle.apps.fnd.framework.webui.OAPageContext;
import oracle.apps.fnd.framework.webui.beans.OAWebBean;
import oracle.apps.fnd.framework.webui.beans.message.OAMessageLovInputBean;
import oracle.apps.fnd.framework.webui.beans.message.OAMessageTextInputBean;
import oracle.apps.fnd.framework.webui.beans.table.OAAdvancedTableBean;
import oracle.apps.fnd.framework.webui.beans.table.OAColumnBean;
import oracle.apps.fnd.framework.webui.beans.table.OASortableHeaderBean;
import oracle.apps.fnd.framework.webui.beans.table.OATableBean;
import oracle.apps.po.document.order.webui.OrderLinesTableRNCO;
public class XXPBOrderLinesTableRNCO extends OrderLinesTableRNCO
public void processRequest(OAPageContext pageContext, OAWebBean webBean)
super.processRequest(pageContext, webBean);
OAAdvancedTableBean tableBean =
(OAAdvancedTableBean)webBean.findIndexedChildRecursive("LinesTableRN");
OAMessageLovInputBean poLineLov =
(OAMessageLovInputBean)tableBean.findIndexedChildRecursive("XXPBSecondaryUOMLOV");
poLineLov.setDisabled(false);
I have changed the control class using personalization. When i test this it gives me a null pointer exception. Can you please help and look if my code is wrong.
java.lang.NullPointerException
at xxpb.oracle.apps.po.webui.XXPBOrderLinesTableRNCO.processRequest(XXPBOrderLinesTableRNCO.java:23)

Hi,
General Practice is to check for not null when you try to use the handle.
Ex:
public class XXPBOrderLinesTableRNCO extends OrderLinesTableRNCO
public void processRequest(OAPageContext pageContext, OAWebBean webBean)
super.processRequest(pageContext, webBean);
OAAdvancedTableBean tableBean =
(OAAdvancedTableBean)webBean.findIndexedChildRecursive("LinesTableRN");
if (tableBean != null)
OAMessageLovInputBean poLineLov =
(OAMessageLovInputBean)tableBean.findIndexedChildRecursive("XXPBSecondaryUOMLOV");
if (poLineLov != null)
poLineLov.setDisabled(false);
Regards
Sudhakar Mani
http://oraclearea51.com/sudhakarmani

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