Is it possible to run multiple of test in one unit in testng - selenium

Question

I am reading data from excel and running my test cases.It is possible to run multiple of test method in one test unit using testNg and eclipse.Below is my code.I tried it but getting error
at org.testng.internal.MethodInvocationHelper.invokeDataProvider(MethodInvocationHelper.java:161)
at org.testng.internal.Parameters.handleParameters(Parameters.java:429)
at org.testng.internal.Invoker.handleParameters(Invoker.java:1383)
at org.testng.internal.Invoker.createParameters(Invoker.java:1075)
at org.testng.internal.Invoker.invokeTestMethods(Invoker.java:1180)
login.java
import com.thoughtworks.selenium.*;
import org.junit.AfterClass;
import org.openqa.selenium.server.SeleniumServer;
import org.testng.annotations.*;
import java.io.File;
import jxl.*;
public class login extends SeleneseTestCase {
#BeforeClass
public void setUp() throws Exception {
try {
System.out.println("in setup");
SeleniumServer seleniumserver = new SeleniumServer();
seleniumserver.boot();
seleniumserver.start();
// String
// firefoxPath="C:\\Program Files (x86)\\Mozilla Firefox\\firefox.exe";
setUp("http://localhost:8080/",
"*firefox C:\\Program Files (x86)\\Mozilla Firefox\\firefox.exe");
// selenium.open("/");
selenium.windowMaximize();
selenium.windowFocus();
} catch (Exception ex) {
System.out.println(ex);
}
}
#DataProvider(name = "DP1")
public Object[][] createData1() throws Exception {
System.out.println("in createData1");
Object[][] retObjArr = getTableArray(
"test\\Resources\\Data\\logins.xls", "loginSheet", "Login");
return (retObjArr);
}
#Test(dataProvider = "DP1",testName="checkLogin")
public void testLogin1(String userName, String Password,
String expectedResult) throws Exception {
System.out.println("in testLogin1");
System.out.println("userName: " + userName + " Password: " + Password
+ " expectedResult: " + expectedResult);
selenium.open("Banking/Login.jsp/");
Thread.sleep(1000);
selenium.type("id=fname", userName);
Thread.sleep(1000);
selenium.type("id=Lname", Password);
Thread.sleep(1000);
selenium.click("name=sub");
Thread.sleep(1000);
boolean res = selenium.isTextPresent(expectedResult);
System.out.println("ver: " + res);
verifyTrue(res);
Thread.sleep(1000);
}
#Test(dataProvider = "DP1" ,testName="homepage")
public void testLogin2(String userName, String Password,
String expectedResult) throws Exception {
System.out.println("in testLogin2");
}
#AfterClass
public void tearDown() {
selenium.close();
selenium.stop();
}
/* this method read the data from excel sheet */
public String[][] getTableArray(String xlFilePath, String sheetName,
String tableTagName) throws Exception {
String[][] tabArray = null;
System.out.println("in getTableArray");
System.out.println("table: " + tableTagName + " xlFilePath:"
+ xlFilePath + " sheetName: " + sheetName);
Workbook workbook = Workbook.getWorkbook(new File(xlFilePath));
Sheet sheet = workbook.getSheet(sheetName);
int startRow, startCol, endRow, endCol, ci, cj;
Cell tableStart = sheet.findCell(tableTagName);// find table name in
// excel
startRow = tableStart.getRow();
startCol = tableStart.getColumn();
Cell tableEnd = sheet.findCell(tableTagName, startCol + 1,
startRow + 1, 100, 64000, false);
endRow = tableEnd.getRow();
endCol = tableEnd.getColumn();
System.out.println("startRow=" + startRow + ", endRow=" + endRow + ", "
+ "startCol=" + startCol + ", endCol=" + endCol);
tabArray = new String[endRow - startRow - 1][endCol - startCol - 1];
ci = 0;
for (int i = startRow + 1; i < endRow; i++, ci++) {
cj = 0;
for (int j = startCol + 1; j < endCol; j++, cj++) {
tabArray[ci][cj] = sheet.getCell(j, i).getContents();
// System.out.println("tabArray: "+ tabArray[ci][cj]);
}
}
return (tabArray);
}
}