Checking cell is null or not

Question

Hi ,
Iam using poi to read excel sheet. Iam reading line by line of excel sheet using HssfUserModel.
Here is my code
int numberOfRows = sheet.getLastRowNum();
for (int i = 1; i <= numberOfRows; i++)
  HSSFRow row = sheet.getRow(i);
//  check whether row is null or not
  if (row != null)
    int numberOfCells = row.getLastCellNum();
     for(int j=0;j <= numberOfCells;j++)
         HSSFCell cell = row.getCell((short)j);
         short cellNumber = cell.getCellNum();
      //check whether cell is null or not
          if(cell!=null)
            if(cellNumber ==  myTradeConstants.scripCode_column_Number)
               cell =row.getCell(myTradeConstants.scripCode_column_Number);
               scripCode =cell.getStringCellValue();
               System.out.println("scripCode:"+scripCode);
        else
              System.out.println("nocellValue");
              break;
else
   System.out.println("rowBreak");
   break;
}My Excel sheet is also having so many number of rows. But it is displaying only first row of the excel sheet. n displaying "nullpointerException".
why iam getting nullPointer Exception.
I want to check whether a cell is having data or not.
can anybody guide me in right dircection.
regards,
ramu.

Answer 1

import java.io.FileInputStream;
import java.io.IOException;
import java.util.Iterator;
import org.apache.poi.hssf.usermodel.HSSFCell;
import org.apache.poi.hssf.usermodel.HSSFRow;
import org.apache.poi.hssf.usermodel.HSSFSheet;
import org.apache.poi.hssf.usermodel.HSSFWorkbook;
import org.apache.poi.poifs.filesystem.POIFSFileSystem;
public class cellCheck {
* @param args
public static void main(String[] args) {
          // TODO Auto-generated method stub
try {
    POIFSFileSystem fs = new POIFSFileSystem(new FileInputStream(
                         args[0]));
    HSSFWorkbook workbook = new HSSFWorkbook(fs);
    HSSFSheet sheet = workbook.getSheet("Main");          // HSSFRow row = sheet.getRow(1);
     int numberOfRows = sheet.getLastRowNum();
   System.out.println("numberOfRowsInThe Sheet" + numberOfRows);
     String scripCode = null;
    for (int i = 1; i <= numberOfRows; i++)
     HSSFRow row = sheet.getRow(i);
     if (row != null)
     int numberOfCells = row.getLastCellNum();
     for(int j=0;j <= numberOfCells;j++)
                              HSSFCell cell = row.getCell((short)j);
     short cellNumber = cell.getCellNum();
     if(cell!=null)
     if(cellNumber == myTradeConstants.scripCode_column_Number)
                              cell =row.getCell(myTradeConstants.scripCode_column_Number);
                                  scripCode =cell.getStringCellValue();
                                  System.out.println("scripCode:"+scripCode);
                              else
                                   break;
                    //else
                         System.out.println("rowBreak");
                         break;
          } catch (IOException ioe) {
               // TODO: handle exception
               System.out.println("IoException" + ioe.getMessage());
}