Selecting a default row in an adf detail table problem

Question

Hi, i'm hoping someone can help me as this problem is driving me to despair. I am using JDeveloper 10.1.3 production. All I want to do is set the first row selected in the detail af:table in my page. I have referred to the documentation available at http://www.oracle.com/technology/products/jdev/htdocs/partners/addins/exchange/jsf/doc/devguide/table.html#Single%20Selection and from this I have created the following code which I think should work.
public void setResourcesTable(CoreTable resourcesTable) {
this.resourcesTable = resourcesTable;
RowKeySet r = resourcesTable.getSelectionState();
if(r != null){
Iterator selection = r.getKeySet().iterator();
if(selection.hasNext()){
String rowKey = (String) selection.next();
resourcesTable.setRowKey(rowKey);
The main problem is that the getSelectionState() is returning null and I cant understand why. This happens regardless of whether or not there are any detail rows in the table. I havent been using JSF that long and so I apologise if i'm missing something obvious.
Please help me as I haven't been able to find any help throughout the forums apart from referring me to the same page and I cant believe that it can possibly be this difficult just to set the default row.
Thanks in advance,
Lee

Answer 1

mark,
Those four fields can be set completely declaratively in the Entity Object (check out the History Colum feature). Copied from the (11g) documentation:
If you need to keep track of historical information in your entity object, such as when an entity was created or modified and by whom, or the number of times the entity has been modified, you specify an attribute with the History Column option selected (in the Edit Attribute dialog).
If an attribute's data type is Number, String, or Date, and if it is not part of the primary key, then you can enable this property to have your entity automatically maintain the attribute's value for historical auditing. How the framework handles the attribute depends which type of history attribute you indicate:
* Created On: This attribute is populated with the time stamp of when the row was created. The time stamp is obtained from the database.
* Created By: The attribute is populated with the name of the user who created the row. The user name is obtained using the getUserPrincipalName() method on the Session object.
* Modified On: This attribute is populated with the time stamp whenever the row is updated/created.
* Modified By: This attribute is populated with the name of the user who creates or updates the row.
* Version Number: This attribute is populated with a long value that is incremented whenever a row is created or updated.
John