NUll Pointer Exception using getTilte(); Selenium with Java - selenium

Question

Have two classes one Login and the other which is the TestNG class, I created variable to get the Title of the page but when trying to run the test it is displaying null pointer exception, if I remove the getTitle variable it runs.
package main;
import org.openqa.selenium.By;
import org.openqa.selenium.WebDriver;
public class Login {
WebDriver driver ;
By userNameTextBox = By.name("email");
By passwordTestBox = By.id("password");
By loginButton = By.id("signInButton");
String titleText = driver.getTitle();
public Login(WebDriver driver) {
this.driver=driver;
}
public void setUserName() {
driver.findElement(userNameTextBox).sendKeys("v-tobias.rivera#shutterfly.com");
}
public void setPassword() {
driver.findElement(passwordTestBox).sendKeys("Indecomm1");
}
public void clickLogin() {
driver.findElement(loginButton).click();;
}
}
package test;
import org.openqa.selenium.By;
import org.openqa.selenium.WebElement;
import org.openqa.selenium.support.ui.ExpectedConditions;
import org.testng.Assert;
import org.testng.annotations.Test;
import org.testng.annotations.BeforeMethod;
import org.openqa.selenium.chrome.ChromeDriver;
import org.testng.annotations.AfterTest;
//import org.openqa.selenium.support.ui.ExpectedConditions;
import org.openqa.selenium.support.ui.WebDriverWait;
import java.time.Duration;
//import org.openqa.selenium.By;
import org.openqa.selenium.WebDriver;
import main.Login;
public class LoginTest {
WebDriver driver;
Login objLogin;
#BeforeMethod
public void beforeTest() {
System.setProperty("chromedriver", "/Users/tobiasriveramonge/eclipse-
workspaceAutomation/seleniumAutomation");
driver = new ChromeDriver();
driver.manage().window().maximize();
driver.get("https://accounts.shutterfly.com/?
redirectUri=https%3A%2F%2Fwww.shutterfly.com%2F&cid=&brand=SFLY&theme=SFLY");
WebDriverWait wait = new WebDriverWait(driver,Duration.ofSeconds(30));
WebElement element =
wait.until(ExpectedConditions.presenceOfElementLocated(By.id("email")));
element.isDisplayed();
}
#Test
public void Test() {
objLogin = new Login(driver);
//String title = objLogin.getTitle();
// System.out.println(title);
//Assert.assertTrue(loginPageTitle.toLowerCase().contains(" "));
objLogin.setUserName();
objLogin.setPassword();
objLogin.clickLogin();
}
#AfterTest
public void afterTest() {
driver.quit();
}
}
I would like to know why am I getting this exception.
Hi, Have two classes one Login and the other which is the TestNG class, I created variable to get the Title of the page but when trying to run the test it is displaying null pointer exception, if I remove the getTitle variable it runs.

Answer 1

You did not initialize the driver object.
That's why referencing to that not initialized object throws the null pointer exception.
You only declared the driver object type by
WebDriver driver;
but never initialized it.