Problem with the event driven XLS reader in HSSF. I believe the value returned 
by the RowRecord object for the last column used (indexed on 0) is incorrect. 
The value actually returned is the correct value + 1.

Snippet of code below (basically the simple event example in the docs):

public void processRecord(Record record) {
  switch (record.getSid()) {
    case RowRecord.sid :
      RowRecord rowrec = (RowRecord) record;
      System.out.println("Row number ["
        + rowrec.getRowNumber()
        + "], first col ["
        + rowrec.getFirstCol()
        + "] last col ["
        + rowrec.getLastCol()
        + "]");
  }
}