DataTable and returning to same page.

["Nail, Evan Burke" <Ev...@ENRON.com>]

I'm fairly new to JSF and am having a problem using the datatable. 
 
I'm implementing "select to delete" functionality based on some code I believe Craig posted. It uses a UISelectBoolean and UIData and iterates through them to determine the selected rows as such...
 
        int first = table.getFirst();
        int rows = table.getRows();
        
        for (int index = first; index < (first + rows); index++) {
 
            // Position the table at the current row ...
            table.setRowIndex(index);
            // And get the message bean for this row ...
            Photo photo = (Photo)
             FacesContext.getCurrentInstance().getExternalContext().getRequestMap().get("photo");
         
            // If this row is selected, delete the corresponding photo
            if (selected.isSelected()) {
                photosToDelete.add(photo);
            }
 
        }
        table.setRowIndex(-1); // We're done now
        return "go_photolist";
 
This works fine for me if my action returns to a different page ( i.e. return "go_home" ) however if I return to the same page  I get a nullpointerexception on the HtmlDataTable getFirst Method. 
 
I'm sure I just simply don't understand how the model gets updated throughout the lifecycle and somehow I'm not setting things up correctly, but I'm not sure how to accomplish this. 
 
Anyone know what I need to do?
 
 
Thanks
Burke
 
 
 


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