How to resolve null pointer exception where running class using testng test. Trying to use three classes to make framework for automation. I tried calling "driver.get(baseURL);" in setup of base class. it worked, but stuck at next method to enter user name. any help as stuck at one step?

//base class
package com.crmnext.testCases;
import java.time.Duration;
import org.openqa.selenium.WebDriver;
import org.openqa.selenium.chrome.ChromeDriver;
import org.testng.annotations.AfterClass;
import org.testng.annotations.BeforeClass;
import io.github.bonigarcia.wdm.WebDriverManager;

public class BaseClass {

    public String baseURL = "https://my.crm.com/crmnext/login/login";
    public String username = "[email protected]";
    public String password = "abc11";
    public static WebDriver driver = null;
    
    @BeforeClass
    public void setUp ()
    {
        System.out.println("in setup");
        WebDriverManager.chromedriver().setup();
        WebDriver driver = new ChromeDriver();
        driver.manage().timeouts().implicitlyWait(Duration.ofSeconds(10));
        driver.manage().window().maximize();
    }
    
    @AfterClass
    public void tearDown()
    {
    //  driver.close();
        driver.quit();
    }
    
}

//test case class

package com.crmnext.testCases;

import org.testng.annotations.Test;

import com.crmnext.pageObjects.LoginPage;

public class TC1_LoginTest_001 extends BaseClass
{
    @Test
    public void loginTest()
    {
        driver.get(baseURL);
        LoginPage lp = new LoginPage(driver);

        lp.setUserName(username);
        
        lp.setPwd(password);
        
        lp.clickLogin();
                
    }

    
    
}

//Page class

package com.crmnext.pageObjects;

import java.time.Duration;

import org.openqa.selenium.WebDriver;
import org.openqa.selenium.WebElement;
import org.openqa.selenium.support.CacheLookup;
import org.openqa.selenium.support.FindBy;
import org.openqa.selenium.support.PageFactory;

public class LoginPage {
    
    WebDriver ldriver;
    
    public LoginPage(WebDriver rdriver)
    {
        System.out.println("In Login Page object class");
        ldriver = rdriver;
        PageFactory.initElements(ldriver, this);
    }
    
    @FindBy(css="#TxtName")
    @CacheLookup
    WebElement txtUsername; 
    
    @FindBy (css = "[name='SecureTextBox.Text']")
    @CacheLookup
    WebElement txtPassword;
    
    @FindBy (css ="body.bg-light-gray:nth-child(2) div.body-content.min-vh-100.login-background.h-100:nth-child(1) div.flexbox-row.w-100 div.login-box.relative div.login-container.flexbox-row.items-center.min-vh-100.h-100:nth-child(2) div.flex-1.login-box--inner div:nth-child(1) div.login-form form:nth-child(1) > input.login-button.button.w-100:nth-child(4)")
    @CacheLookup
    WebElement btnLogin;
    
//Function to enter user name
    public void setUserName (String uname)
    {
        System.out.println("in set user name " uname);
        ldriver.manage().timeouts().implicitlyWait(Duration.ofSeconds(5));
        
        txtUsername.sendKeys(uname);
        System.out.println("After enter in user name");
    }
    
//Function to Enter password    
    public void setPwd (String pwd)
    {
        System.out.println("in set password");
        txtPassword.sendKeys(pwd);
    }
// Function to click button
    public void clickLogin ()
    {
        btnLogin.click();
    }
    

}

Getting null pointer exception. Tried similar queries posted. But, none helped.

FAILED: loginTest
java.lang.NullPointerException: Cannot invoke "org.openqa.selenium.WebDriver.get(String)" because "com.crmnext.testCases.TC1_LoginTest_001.driver" is null

It seems driver is getting null.

CodePudding user response：

There is local driver variable in setUp method which is initialized but it is lost upon finishing the setUp method. Thus, static field driver remains set to null and this causes NPE when the static field is referenced.

Fix setUp to remove declaration of local variable:

public void setUp () {
    System.out.println("in setup");
    WebDriverManager.chromedriver().setup();
    driver = new ChromeDriver();
    driver.manage().timeouts().implicitlyWait(Duration.ofSeconds(10));
    driver.manage().window().maximize();
}

CodePudding user response：

You have multiple (two) WebDriver instances initialized at different levels.

• One at the class (BaseClass) level as:

  public static WebDriver driver = null;
  

• Another at the method (setUp()) level as:

  WebDriver driver = new ChromeDriver();
  

Once the program execution comes out of setUp() method, the BaseClass level WebDriver instance is accesed which is NULL. hence you face nullpointerexception

Solution

Declare the WebDriver instance at the class level as it is:

public static WebDriver driver;

At the setUp() method level use the same WebDriver instance as:

driver = new ChromeDriver();

CodePudding user response：

It worked post answer from Alex.

Base class needed updates.

@BeforeClass public void setUp () { System.out.println("in setup"); WebDriverManager.chromedriver().setup();

    driver = new ChromeDriver();
    driver.manage().timeouts().implicitlyWait(Duration.ofSeconds(10));
    driver.manage().window().maximize();
}