Check full article on https://cedricleruth.com/how-to-get-current-column-value-of-selected-richtable-row-from-iterator-in-adf/

getRichTableSelectedRowAttributeValue.java

//Function to call as follow : 
//Object myValue = MyBean.getRichTableSelectedRowAttributeValue("tableID", "VoAttributeName");

public Object getRichTableSelectedRowAttributeValue(String tableID, String attributeName) {
    Object value = null;
    RichTable richTable = (RichTable)findComponentInRoot(tableID); //part of the JSFUtils opensource class
    if (richTable != null) {
        ViewObject vo = getViewObjectFromTable(richTable); //part of the ADFUtils opensource class
        if (vo != null) {
            //Get select row from the view object
            Row row = vo.getCurrentRow(); 
            if (row != null) {
                //Get the attribute value from the view object row
                value = (Object)row.getAttribute(attributeName);
            }
        }
    }
    return value;
}


//The function use the findComponentInRoot util, usually set in a bean called JSFUtils. If you don't have it already here it is:
 /**
 * Method find in the JSFUtils ADF toolkit : https://github.com/CedricL46/Oracle-ADF-and-JSF-Utils-libraries
 * Locate an UIComponent in view root with its component id. Use a recursive way to achieve this.
 * @param id UIComponent id
 * @return UIComponent object
 */
public static UIComponent findComponentInRoot(String id) {
    UIComponent component = null;
    if (id != null) {
        FacesContext facesContext = FacesContext.getCurrentInstance();
        if (facesContext != null) {
            UIComponent root = facesContext.getViewRoot();
            if (root != null) {
                component = findComponent(root, id);
            }
        }
    }
    return component;
}

public static ViewObject getViewObjectFromTable(RichTable richTable) {
    if (richTable != null) {
        CollectionModel model = (CollectionModel)richTable.getValue();
        JUCtrlHierBinding treeBinding = (JUCtrlHierBinding)model.getWrappedData();
        return treeBinding.getDCIteratorBinding().getViewObject();
    } else {
        return null;
    }
}