Going to the next record using Iterators. Please HELP

Question

No offence meant for asking again as this is URGENT.
I am unable to go to the next record.
I need to go to the next record using the RowsetIteratorTag.
But am getting the null pointer exception.
Please can anyone tell me the way to go to the next record.
I AM USING THE NEXT(),BUT STILL NO LUCK
public class CheckDetailRowsIterate extends TagSupport
     public int doStartTag() throws JspException
       Row currentRow = null;
       Row nextRow = null;
       String m_CmpyCode;
       // Find the current row and get Data out of it.
       RowsetIterateTag detailIterator = (RowsetIterateTag)TagSupport.findAncestorWithClass(this, RowsetIterateTag.class);
       if (detailIterator != null)
          currentRow = detailIterator.getRow();
       else
           // No row iterator
           log.logDebug(ClassName,"","No CURRENT ROW Found : ");
       if(currentRow != null)
         String[] attrNames = currentRow.getAttributeNames();
         Object[] obj = currentRow.getAttributeValues();
         // Get the attribute Values
         m_CmpyCode = obj[currentRow.getAttributeIndexOf("CmpyCode")].toString();
        /* Now,move to the next Row.GIVES NULL POINTER EXCEPTION.
        RowSet rowSet = new IT().getRowSet();
        nextRow = rowSet.next();
        m_CmpyCode = obj[nextRow.getAttributeIndexOf("CmpyCode")].toString();
        log.logDebug(ClassName,"","NEXT ROW Values ARE "     + m_CmpyCode );
        rowSet = null;
        return Tag.SKIP_BODY;
     public class IT extends RowsetIterateTag
             RowSet getRowSet()
                  return rs;
}  // End class.

Answer 1

You cannot look for a duplicate record situation using a timer. When you issue the Raise Form_trigger_failure from the when-timer-expired trigger, all it does is stops that trigger. The when-validate trigger has already run and completed with success, before the when-timer-expired trigger even started.
You must do the checking and raise form_trigger_failure at the same time from the When-validate-record trigger.
In fact, you don't even need to Post; first. In the WVR trigger, just do this:
If :System.Record_Status = 'INSERT', then do the select.
Then, if v_counter >= 1, issue the message and Raise Form_Trigger_Failure;