We usually depend on Testng for generating the default reports. Apart from that we use XSLT reports as well to generate PIE Charts based on Failed,Passed,Skipped Testcases.
During this process we face lot of issues. Few of the most commonly observed issues are as follows:
[xslt] Unknown file:23:146: Fatal Error! Could not find function: if
[xslt] : Fatal Error! Fatal error during transformation Cause: Fatal error during transformation
In order to resolve this we have to follow the below steps. At every step we will check and see whether issues are resolved or not.
Step 1 :
Make sure the build.xml file contains 'SaxonLiaison' processor added.
Example:<xslt in="${outputdir}/test-output/testng-results.xml" style="${basedir}/testng-results.xsl" out="${outputdir}/testng-xslt/index.html"  processor="SaxonLiaison">

Re-run the build.xml and verify the issue is resolved. If the issue is not resolved goto Step2.

@DataProvider
In order to store the multiple set of input data we use @DataProvider.
We are going to read the xls file which contains input data and store in @DataProvider.
Steps to Achieve :
  a. Store the input data in an xls file.
  b. Read the data from the xls using an third party jar jxl2.6.jar
   Link for Downloading JXL Jar ->http://www.findjar.com/index.x?query=jxl
   jxl stands for -> java excel library
 c. Add the jar to the build path.
 d. Store the data in @Dataprovider
 e. Use the @Dataprovider in the @Test methods.
JExcel API ->http://jexcelapi.sourceforge.net/resources/javadocs/2_6_10/docs/
  WorkBook contains sheets
  Sheets contains rows and column
  Each and every values stored in the rows and columns in a cell.
  Retrieve the contents of the cell using row index and column index and store in an array
Program:
import java.io.File;
import java.io.IOException;
import jxl.Cell;
import jxl.Sheet;
import jxl.Workbook;
import jxl.read.biff.BiffException;
import org.testng.annotations.DataProvider;
import org.testng.annotations.Test;

public class ReadExcelJXL {
@Test(dataProvider="DP")
public void sales_coupon_count(String username,String password)
{

System.out.println("The value of username" + username);
System.out.println("The value of password" + password);

}
@DataProvider(name="DP")
public String[][] readExcel(  )
{
File file = new File("inputData.xls");
String inputData[][] = null;
Workbook w;

try {
w = Workbook.getWorkbook(file);

// Get the first sheet
Sheet sheet = w.getSheet(0);

int colcount=sheet.getColumns();

int rowcount=sheet.getRows();

inputData= new String[rowcount][colcount];

for ( int i=0;i<sheet.getRows();i++)
{
for (int j=0;j<sheet.getColumns();j++)
{
Cell cell=sheet.getCell(j,i);
inputData[i][j]=cell.getContents();
}
}
} catch (BiffException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
return inputData;
 }
}
The value of username-->xyz
The value of password-->abc
The value of username-->abc
The value of password-->welcome
The value of username-->ab1123
The value of password-->welcome123
PASSED: sales_coupon_count("xyz", "abc")
PASSED: sales_coupon_count("abc ", "welcome ")
PASSED: sales_coupon_count("ab1123 ", "welcome123")

===============================================
    ReadExcelJXL
    Tests run: 3, Failures: 0, Skips: 0
===============================================


===============================================
DataDriven
Total tests run: 3, Failures: 0, Skips: 0
===============================================
inputData.xls

Handling the Listbox in Selenium WebDriver in the below website http://www.cheapflights.com/ is shown below:







HTML <ul> Tag
HTML Code for ListBox in http://www.cheapflights.com/: 
Output:

Required Configuration

• The IEDriverServer exectuable must be downloaded and placed in your PATH.
• On IE 7 or higher on Windows Vista or Windows 7, you must set the Protected Mode settings for each zone to be the same value. The value can be on or off, as long as it is the same for every zone. To set the Protected Mode settings, choose "Internet Options..." from the Tools menu, and click on the Security tab. For each zone, there will be a check box at the bottom of the tab labeled "Enable Protected Mode".
• Additionally, "Enhanced Protected Mode" must be disabled for IE 10 and higher. This option is found in the Advanced tab of the Internet Options dialog.
• The browser zoom level must be set to 100% so that the native mouse events can be set to the correct coordinates.
• For IE 11 only, you will need to set a registry entry on the target computer so that the driver can maintain a connection to the instance of Internet Explorer it creates. For 32-bit Windows installations, the key you must examine in the registry editor isHKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Internet Explorer\Main\FeatureControl\FEATURE_BFCACHE. For 64-bit Windows installations, the key is HKEY_LOCAL_MACHINE\SOFTWARE\Wow6432Node\Microsoft\Internet Explorer\Main\FeatureControl\FEATURE_BFCACHE. Please note that the FEATURE_BFCACHE subkey may or may not be present, and should be created if it is not present. Important: Inside this key, create a DWORD value named iexplore.exe with the value of 0.

In Selenium Webdriver whenever we try to launch the IE we get the Security Warning pop-up.
Handling security warning pop-up can be done in two ways.

1. Using Robot Script as follows:

try {
        (new Robot()).keyPress(java.awt.event.KeyEvent.VK_ENTER);

         (new Robot()).keyRelease(java.awt.event.KeyEvent.VK_ENTER);
         } catch (AWTException e) {
                // TODO Auto-generated catch block
                e.printStackTrace();
            }

2. Adding the website url in the Trusted websites

Open Internet Explorer by clicking the Start button . In the search box, type Internet Explorer, and then, in the list of results, click Internet  Explorer.


Navigate to the website that you want to add to a specific security zone.


Click the Tools button, and then click Internet Options.


Click the Security tab, and then click a security zone (Local intranet, Trusted sites, or Restricted sites).


Click Sites.


If you clicked Local intranet in step 4, click Advanced.


The website should be shown in the Add this website to the zone field. Click Add.

If the site is not a secure site (HTTPS), clear the Require server verification (https:) for all sites in this zone check box.


Click Close, and then click OK (or click OK twice if you clicked Local intranet in step 4).