How to pass single browser instance to different classes

How to pass single browser instance to different classes ,
Say Ex : I have Class A where i initialize browser and steps of test will be spread across different method defined in different class say Class B , Class C . But my Actual test method is written in Class D .

Here how can i use single instance , Because i can see null value in driver in subClasses .
Please do let me know if more Info required .

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  • 5 Answer(s)

    There are multiple ways to do this.

    1. To every class pass the webdriver instance. As webdriver is a reference type you will just copy the address and your webdriver will be an updated version throughout.
    2. Isolate the browser creation logic from Tests. Create a seperate class, lets say, BrowserFactory and in that class create a WebDriver object.  Call this class every time you want a webdriver instance. This mechanism when implemented properly is called a Factory design pattern,  Just take a look at factory pattern theory and create a class for that.

    Sample code will look something like this, you may want to improvise on this as per your needs

    package Factories;
    import java.util.concurrent.TimeUnit;
    import org.openqa.selenium.WebDriver;
    import org.openqa.selenium.firefox.FirefoxDriver;
    * This class has following responsibilities
    * - To create required WebDriver
    * - To maintain an instance of a WebDriver
    public class BrowserFactory {
    private static WebDriver driver;
    public static WebDriver getBrowser(String browserName) {
    if (driver == null) {
    if (browserName.equals("Firefox")) {
    driver = new FirefoxDriver();
    } else if (browserName.equals("InternetExplorer")) {
    driver = new InternetExplorerDriver();
    } else if (browserName.equals("Chrome")) {
    System.setProperty("", DataProviderFactory
    driver = new ChromeDriver();
    long pageLoadTimeOut = DataProviderFactory
    long implictWait = DataProviderFactory.getRunConfigDataProvider()
    .pageLoadTimeout(pageLoadTimeOut, TimeUnit.MILLISECONDS);
    .implicitlyWait(implictWait, TimeUnit.MILLISECONDS);
    return driver;
    public static WebDriver getBrowser() {
    return driver;
    public static void closeWebDriver() {
    driver = null;


    Professor Answered on June 2, 2015.
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    Hi Virender ,

    Thanks for reply !!.

    I’m aware of above pattern , but want to know how to make best use of it .

    Form your answer i have few questions to make it more understandable .

    1. DataProviderFactory is class which is written by you , i’mean some custom class not Selenium , right ?

    2. Here if i consider “BrowserFactory ” as parent or base class , How to make use of bowser instance in other classes , Ex: From your method in Common reusable ,  Actual Test method in Module class(Module here mean which is project specific) ?

    Train Answered on June 3, 2015.
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    VDataProviderFactory is a custom class that I have written.
    BrowserFactory has a static methods. You dont have to create instance of this class anywhere. All you have to do is
    BrowserFactory.GetBrowser() from other classes and it will return you a webdriver instance.

    Note: This class was designed by me for my framework, you will have to improvise or remove unnecessarily part based on your needs.


    Professor Answered on June 3, 2015.
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    Virender ,

    Do you really think its wise idea to call instance as “BrowserFactory.GetBrowser()” in long run i’mean in framework level , where your application might quite vast . I have another idea but need you help here in implementing it . Here it is

    Create a base class for driver instance , then passing this instance as parameter and then in sub class methods where ever its required call  this instance as by Super(river).. this is one of implementation i had seen . Need your input in implementing it and working flow .

    Train Answered on June 4, 2015.
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    Hey Jagdeesh,
    Nice idea that you have shared. There are two questions here
    1. Is having a factory managing driver instance a good idea?
    2. Can we have a base test class and let the base test class contain a driver instance.

    Q1: To answer this I will give you reference of Log4J. If you have used it, you will see that programmers always do this at the start of the class

    Logger logger = LogManager.GetLogger(<ClassName>);

    you will see this LogManager.GetLogger in every class of a project which uses a Log4j implementation. LogManager is a factory which manages and provides logger to every one. And Log4j is a corporate level tool which is used by very large projects. So having a factory pattern will not have any impact on a small or a large project. I dont know what exactly you thing the problem would be?

    You can always have base test class and from the problem that you are explaining I see that you will have a similar BaseTest class structure

    package SampleTest;
    import org.openqa.selenium.WebDriver;
    public class BaseTest {
    protected WebDriver driver;
    public BaseTest(WebDriver driver)
    this.driver = driver;

    and different test classes will look something like this

    package SampleTest;
    import org.openqa.selenium.WebDriver;
    public class TestClass extends BaseTest {
    public TestClass(WebDriver driver)
    //Different test methods on the class go here!!!

    Well I dont think this solves your problem. The reason why I am saying this is because, I am not sure from where will you get the driver instance? as you have mentioned you want to share the same driver instance to different test classes, I am not sure which class will maintain the driver instance?

    Do let me know of these questions and I will be able to understand your problem better.


    Professor Answered on June 4, 2015.
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