Received Data Provider Mismatch error - testng-dataprovider

Question

Tried below code but receiving Data Provider Mismatch error. Could anyone help out on this?
package appModules;
import org.testng.annotations.Test;
import jxl.Sheet;
import jxl.Workbook;
import jxl.read.biff.BiffException;
import org.testng.annotations.DataProvider;
import org.testng.annotations.BeforeTest;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.IOException;
import org.openqa.selenium.By;
import org.openqa.selenium.WebDriver;
import org.openqa.selenium.firefox.FirefoxDriver;
import org.openqa.selenium.support.ui.WebDriverWait;
import org.testng.annotations.AfterTest;
import org.testng.annotations.BeforeClass;
public class NewTest {
public WebDriver driver;
public WebDriverWait wait;
String appURL =
"https://dev.agencyport.rsagroup.ca:8443/agencyportal/ProcessLogoff";
//Locators
private By username = By.id("USERID");
private By password = By.id("PASSWORD");
#BeforeClass
public void testSetup() {
System.setProperty("webdriver.firefox.marionette",
"C:\\Automation\\geckodriver.exe");
driver=new FirefoxDriver();
driver.manage().window().maximize();
wait = new WebDriverWait(driver, 5);
}
#Test(dataProvider = "login")
public void Login(String Username, String Password) {
driver.findElement(username).sendKeys(Username);
driver.findElement(password).sendKeys(Password);
}
#DataProvider (name="login")
public Object[][] dp() throws Exception{
Object[][] arrayObject =
getExcelData("C:\\Automation\\testData.xls","New");
return arrayObject;
}
public String[][] getExcelData(String fileName, String sheetName) throws
Exception {
String[][] arrayExcelData = null;
try {
FileInputStream fs = new FileInputStream(fileName);
Workbook wb = Workbook.getWorkbook(fs);
Sheet sh = wb.getSheet(sheetName);
int totalNoOfCols = sh.getColumns();
System.out.println(totalNoOfCols);
int totalNoOfRows = sh.getRows();
System.out.println(totalNoOfRows);
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();
System.out.println(arrayExcelData[i-1][j]);
}
}
} 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();
}
}
Received below error -
org.testng.internal.reflect.MethodMatcherException:
Data provider mismatch
Method: Login([Parameter{index=0, type=java.lang.String,
declaredAnnotations=[]}, Parameter{index=1, type=java.lang.String,
declaredAnnotations=[]}])
Arguments: [(java.lang.String) agent,(java.lang.String) password,
(java.lang.String) ]
atorg.testng.internal.reflect.DataProviderMethodMatcher.getConformingArguments(DataProviderMethodMatcher.java:45)
at org.testng.internal.Parameters.injectParameters(Parameters.java:796)
at org.testng.internal.Invoker.invokeTestMethods(Invoker.java:982)
at org.testng.internal.TestMethodWorker.invokeTestMethods(TestMethodWorker.java:125)
at org.testng.internal.TestMethodWorker.run(TestMethodWorker.java:109)
at org.testng.TestRunner.privateRun(TestRunner.java:648)
at org.testng.TestRunner.run(TestRunner.java:505)
at org.testng.SuiteRunner.runTest(SuiteRunner.java:455)
at org.testng.SuiteRunner.runSequentially(SuiteRunner.java:450)
at org.testng.SuiteRunner.privateRun(SuiteRunner.java:415)
at org.testng.SuiteRunner.run(SuiteRunner.java:364)
at org.testng.SuiteRunnerWorker.runSuite(SuiteRunnerWorker.java:52)
at org.testng.SuiteRunnerWorker.run(SuiteRunnerWorker.java:84)
at org.testng.TestNG.runSuitesSequentially(TestNG.java:1208)
at org.testng.TestNG.runSuitesLocally(TestNG.java:1137)
at org.testng.TestNG.runSuites(TestNG.java:1049)
at org.testng.TestNG.run(TestNG.java:1017)
at org.testng.remote.AbstractRemoteTestNG.run(AbstractRemoteTestNG.java:114)
at org.testng.remote.RemoteTestNG.initAndRun(RemoteTestNG.java:251)
at org.testng.remote.RemoteTestNG.main(RemoteTestNG.java:77)`

Answer 1

You are passing return value of arrayObject with incorrect Data Type,
You need to get String value from Excel File in Data Provider Method, and That you need to pass in Object.
Refer below Example, for Reference:
#DataProvider
public Iterator<Object[]> getTestData()
{
ArrayList<Object[]> testdata = new ArrayList<Object[]>();
try {
reader = new excelUtility(excelTestDataFile);
} catch (Exception e) {
e.printStackTrace();
}
sheetName = className;
for (int rowNumber = 2; rowNumber <= reader.getRowCount(sheetName); rowNumber++) {
String caseNo = reader.getCellData(sheetName, "Case", rowNumber);
String emailid = reader.getCellData(sheetName, "Email ID", rowNumber);
String password = reader.getCellData(sheetName, "Password", rowNumber);
String message = reader.getCellData(sheetName, "Expected Result", rowNumber);
Object ob[] =
{ caseNo, emailid, password, message };
testdata.add(ob);
}
return testdata.iterator();
}
And this is the #Test Receiver of Data Provider:
#Test(dataProvider = "getTestData")
public void calllogin(String caseNO, String emailid, String password, String expectedResult) throws Exception
{
******
}