java null pointer exception in test suite

Question

I am stuck at a situation. Here i have created one testsuite with two test cases in it. First test case is executed properly. In second test case, it throws error of java.lang.NullPointerException at Webdriver driver

Test Case:

 public class second{
    private WebDriver driver;

    @Test
    public void sample() throws Exception
    {
           System.out.println("tab bar");
           driver.findElement(By.id("tabs"));
           //My code
        }
}

Are you injecting the instance of WebDriver ?

AllTooSir
– AllTooSir

2013-07-19 11:10:08 +00:00
Commented Jul 19, 2013 at 11:10 — AllTooSir
– AllTooSir, Commented Jul 19, 2013 at 11:10
Could you please post the complete class

reto
– reto

2013-07-19 11:11:01 +00:00
Commented Jul 19, 2013 at 11:11 — reto
– reto, Commented Jul 19, 2013 at 11:11

nano_nano · Accepted Answer · 2013-07-19 11:09:52Z

1

WebDriver driver;

is not initiated. What do you expect? The exception is absolutly correct. You can try the following code to avoid the exception:

driver= new WebDriver();
driver.findElement(By.id("tabs"));

answered Jul 19, 2013 at 11:09

nano_nano

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3 Comments

Ittiel Over a year ago

WebDriver is an interface and cannot be initialized, you should use the implementation like: WebDriver driver = new FirefoxDriver();

nano_nano Over a year ago

ok. I just wanne show him the basics. I dont know this interface.

user2376425 Over a year ago

Thanks for the reply...i had already initialized in one class

Ruchira Gayan Ranaweera · Accepted Answer · 2013-07-19 11:10:24Z

1

 private WebDriver driver; // initialize this

answered Jul 19, 2013 at 11:10

Ruchira Gayan Ranaweera

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7 Comments

user2376425 Over a year ago

Thank for reply. But in every test case driver= new WebDriver(); is suppose to be initialized ? Am new to this so please consider

Ruchira Gayan Ranaweera Over a year ago

You may have to initialize in every class if you are going it with this way

user2376425 Over a year ago

In my first class also i have initialized "driver = new ChromeDriver"

Ruchira Gayan Ranaweera Over a year ago

Yes, that's why your first test case was success. You have to initialize driver here as well.

Ruchira Gayan Ranaweera Over a year ago

Else you may have to change your architecture using spring and use dependency injection

|

Ittiel · Accepted Answer · 2013-07-22 12:33:12Z

0

WebDriver is an interface and cannot be initialized, you should use the implementation like: WebDriver driver = new FirefoxDriver();

answered Jul 22, 2013 at 12:33

Ittiel

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1 Comment

user2376425 Over a year ago

Yes i agree,but i initialized it in my "First Class", so do i need to do the same in "Second Class" ? Here "Second Class" is continued to the "First Class". E.g: In my "First Class" i did login and my "Second Class" contains script for further part. So what should i do in this case. I am new to this, so please advice.

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