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Thread: getting NullPointerException, but not sure how or why

  1. #1
    Join Date
    Jan 2003
    Location
    PA
    Posts
    1,901

    getting NullPointerException, but not sure how or why

    I have the below code, with System.out.println for debugging, and when the code runs, it is only getting to #2 of my System.out.println statements, then gets a NullPointerException on the line in bold (the finally clause). How can it be getting this nullpointer when it only got to #2 of my debugging statements? It didn't even try to make a connection to my database yet. Could someone help me work this out?
    Code:
    private static void compareNexgenData(String args[]) throws InstantiationException, IllegalAccessException, ClassNotFoundException, SQLException{
            Class.forName(databaseDriver).newInstance();
            
            String spreadsheetNexgenLastName = null;
            int spreadsheetCustomerNumber = 0;
            String spreadsheetNameMatch = null;
            String databaseNameValue = null;
            String databaseLastName = null;
            Connection connection = null;
            PreparedStatement preparedStatement = null;
            
            try {
                File file = new File(args[3]);
                System.out.println("1");
                InputStream inputStream = new FileInputStream(file);            
                System.out.println("2: " + file.toString());
                Workbook wb = WorkbookFactory.create(inputStream);
                System.out.println("3");
                Sheet sheet = wb.getSheetAt(0);     
                System.out.println("4");
                            
                connection = DriverManager.getConnection(databaseConnectionString, args[1], args[2]);
                System.out.println("5");
                preparedStatement = connection.prepareStatement("select VALUE from xxx where CUSTOMER_NBR = ? and ATTRIBUTE_CODE = 'NAME'");
                System.out.println("6");
                
                for (Row row : sheet) {
                    System.out.println("7");
                    Cell spreadsheetNameMatchCell = row.getCell(8);
                    System.out.println("8");
                    spreadsheetNameMatch = spreadsheetNameMatchCell.getRichStringCellValue().getString().toLowerCase().trim();
                    System.out.println("spreadsheetNameMatch: " + spreadsheetNameMatch);
                    
                    if (spreadsheetNameMatch.contains("no")) {
                        Cell spreadsheetCustomerNumberCell = row.getCell(0);
                        spreadsheetCustomerNumber = Integer.valueOf(spreadsheetCustomerNumberCell.getRichStringCellValue().getString());
                        System.out.println("*****spreadsheetCustomerNumber: " + spreadsheetCustomerNumber + "*****");
                        
                        Cell spreadsheetNexgenLastNameCell = row.getCell(6);
                        spreadsheetNexgenLastName = spreadsheetNexgenLastNameCell.getRichStringCellValue().getString().toLowerCase().trim();
                        System.out.println("*****spreadsheetNexgenLastName: " + spreadsheetNexgenLastName + "*****");
                        
                        preparedStatement.setInt(1,spreadsheetCustomerNumber);
                        
                        ResultSet resultSet = preparedStatement.executeQuery();
                        
                        if (resultSet != null) {
                            while (resultSet.next()) {
                                databaseNameValue = resultSet.getString("VALUE").toLowerCase();
                                System.out.println("*****databaseValue: " + databaseNameValue + "*****");
                                
                                //get the last name from the returned database column value
                                if (databaseNameValue.indexOf("lastname") > 0) {
                                    int lastNameStartIndex = databaseNameValue.lastIndexOf("lastname");
                                    databaseLastName = databaseNameValue.substring(lastNameStartIndex + 9).toLowerCase().trim();                    
                                }
                                System.out.println("*****databaseLastName: " + databaseLastName + "*****");
                            }                        
                            //Compare databaseNameValue last name to spreadsheetLastName
                            if (spreadsheetNexgenLastName.equalsIgnoreCase(databaseLastName)) {
                                System.out.println("Customer Number " + spreadsheetCustomerNumber + ": Data entered matches Nexgen");
                                System.out.println("\n");
                                Cell newCell = row.getCell(9);
                                newCell.setCellValue("Data entered matches Nexgen");
                            } else {
                                System.out.println("Customer Number " + spreadsheetCustomerNumber + ": Data entered DOES NOT matches Nexgen");
                                System.out.println("\n");
                                Cell newCell = row.getCell(9);
                                newCell.setCellValue("Data entered DOES NOT matches Nexgen");
                            }                        
                        } else {
                            System.out.println("resultSet is null");
                        }    
                    }                
                }
                inputStream.close();
                // Write the output to a file
                FileOutputStream fileOut = new FileOutputStream(file + ".new");
                wb.write(fileOut);
                fileOut.close();
            } catch (FileNotFoundException fnfe) {
                System.out.println("FileNotFoundException");
                fnfe.printStackTrace();
            } catch (SQLException sqle) {
                System.out.println("SQLException selecting row for customer number: " + spreadsheetCustomerNumber);
                sqle.printStackTrace();
            } catch (InvalidFormatException ife) {
                System.out.println("InvalidFormatException");
                ife.printStackTrace();
            } catch (IOException ioe) {
                System.out.println("IOException");
                ioe.printStackTrace();
            } finally {            
                connection.close();            
            }
        }
    Thanks

  2. #2
    Join Date
    Jan 2003
    Location
    PA
    Posts
    1,901
    I think i got this fixed. I was missing a .jar file in my project.

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