Passing data to DataProvider from Excel sheet

package com.pack;

import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.IOException;
import org.junit.Assert;
import org.openqa.selenium.By;
import org.openqa.selenium.WebDriver;
import org.openqa.selenium.firefox.FirefoxDriver;
import org.openqa.selenium.support.ui.ExpectedConditions;
import org.openqa.selenium.support.ui.WebDriverWait;
import org.testng.annotations.BeforeClass;
import org.testng.annotations.DataProvider;
import org.testng.annotations.Test;
import jxl.Sheet;
import jxl.Workbook;
import jxl.read.biff.BiffException;

public class ReadExcelDataProvider {
    public WebDriver driver;
    public WebDriverWait wait;
    String appURL = "https://www.linkedin.com/";
   
    //Locators
    private By byEmail = By.id("session_key-login");
    private By byPassword = By.id("session_password-login");
    private By bySubmit = By.id("signin");
    private By byError = By.id("global-alert-queue");
   
    @BeforeClass
    public void testSetup() {
        driver=new FirefoxDriver();
        driver.manage().window().maximize();
        wait = new WebDriverWait(driver, 5);
    }
   

    @Test(dataProvider="empLogin")
    public void VerifyInvalidLogin(String userName, String password) {
        driver.navigate().to(appURL);
        driver.findElement(byEmail).sendKeys(userName);
        driver.findElement(byPassword).sendKeys(password);
        //wait for element to be visible and perform click
        wait.until(ExpectedConditions.visibilityOfElementLocated(bySubmit));
        driver.findElement(bySubmit).click();
       
        //Check for error message
        wait.until(ExpectedConditions.presenceOfElementLocated(byError));
        String actualErrorDisplayed = driver.findElement(byError).getText();
        String requiredErrorMessage = "Please correct the marked field(s) below.";
        Assert.assertEquals(requiredErrorMessage, actualErrorDisplayed);
       
    }
   
    @DataProvider(name="empLogin")
    public Object[][] loginData() {
        Object[][] arrayObject = getExcelData("D:/sampledoc.xls","Sheet1");
        return arrayObject;
    }

    /**
     * @param File Name
     * @param Sheet Name
     * @return
     */
    public String[][] getExcelData(String fileName, String sheetName) {
        String[][] arrayExcelData = null;
        try {
            FileInputStream fs = new FileInputStream(fileName);
            Workbook wb = Workbook.getWorkbook(fs);
            Sheet sh = wb.getSheet(sheetName);

            int totalNoOfCols = sh.getColumns();
            int totalNoOfRows = sh.getRows();
           
            arrayExcelData = new String[totalNoOfRows-1][totalNoOfCols];
           
            for (int i= 1 ; i < totalNoOfRows; i++) {

                for (int j=0; j < totalNoOfCols; j++) {
                    arrayExcelData[i-1][j] = sh.getCell(j, i).getContents();
                }

            }
        } catch (FileNotFoundException e) {
            e.printStackTrace();
        } catch (IOException e) {
            e.printStackTrace();
            e.printStackTrace();
        } catch (BiffException e) {
            e.printStackTrace();
        }
        return arrayExcelData;
    }

    @Test
    public void tearDown() {
        driver.quit();
    }
}