Same instance of Webdriver in multiple classes in Java Selenium

Question

Class that contains all classes

public class AllTests{
    public static void main(String[] args) {
        Loginer.login();
        Example.linkOne();
        Examplee.linkTwo();
    }
}

Class that starts the Firefox driver and logins

public class Loginer{
    public static login(){
        WebDriver driver = new FirefoxDriver();
        driver.get("http://LINKISHERE.COM/");
        //other login code
    }
}

Actual Selenium code that clicks links and stuff

public class Example{

    public static linkOne() {
            **driver**.findElement(By.className("CLASSNAME")).click();
    }

    public static linkTwo() {
            **driver**.findElement(By.className("CLASSNAME")).click();
    }
}

I'm pretty new to JAVA, I only worked with python till now. What I'm trying to do is have multiple tests split into multiple classes that are part of the AllTests class, so I can take them out or add new ones with easy. My trouble has been using the same WebDriver in all classes due to this java.lang.NullPointerException. Is this recommended or should it be fine to have Selenium start a new WebDriver every time?

Look into TestNG and the many examples on how to get started. — JeffC
– JeffC, Commented Oct 10, 2017 at 13:13

Luciano van der Veekens · Accepted Answer · 2017-10-10 12:44:57Z

3

Initialize the driver in the AllTests class and pass it along to the others as a method argument.

public class AllTests {
    public static void main(String[] args) {
        WebDriver driver = new FirefoxDriver();

        Loginer.login(driver);
        Example.linkOne(driver);
        Examplee.linkTwo(driver);
    }
}

public class Loginer {
    public static void login(WebDriver driver){
        driver.get("http://LINKISHERE.COM/");
        // other login code
    }
}

public class Example { 
    public static void linkOne(WebDriver driver) {
        driver.findElement(By.className("CLASSNAME")).click();
    }
}

public class Examplee {  
    public static void linkTwo(WebDriver driver) {
        driver.findElement(By.className("CLASSNAME")).click();
    }
}

edited Oct 10, 2017 at 12:44

answered Oct 10, 2017 at 12:38

Luciano van der Veekens

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1 Comment

Alex Toma Over a year ago

This worked, can't believe is was that easy. Thanks a lot. Could multiple variables be passed in this way? Eg: a variable "i" that increases in value with every call of "i++"

Murthi · Accepted Answer · 2017-10-10 12:35:53Z

3

You can change your classes as given below.

public class Loginer{

  public static WebDriver driver;

  public static login(){

    driver = new FirefoxDriver();

    driver.get("http://LINKISHERE.COM/");
    //other login code
    }
}

public class Example{

 public static linkOne() {

        Loginer.driver.findElement(By.className("CLASSNAME")).click();

    }
}

public class Examplee{

 public static linkTwo() {

        Loginer.driver.findElement(By.className("CLASSNAME")).click();

    }
}

Here, I am storing the driver instance in a static variable and using it in all classes. It may works for you.

answered Oct 10, 2017 at 12:35

Murthi

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