title: What is the use of CELL_TYPE_ERROR?
body: <p>I want to understand the use of cell type CELL_TYPE_ERROR in apache poi. I tried the following code, I see no error.</p>
  
  <pre><code>Workbook wb = new XSSFWorkbook();
  Row row = sheet1.createRow(0);
  Cell cell = row.createCell(0);
  
  cell.setCellType(Cell.CELL_TYPE_ERROR);
  cell.setCellValue(234);
  System.out.println("error cell value-"+ cell.getNumericCellValue()); //this prints 234.0
  </code></pre>
  
  <p>Also, I want to understand if the cell can be of type <code>error</code> if we don't manually set its type. </p>