title: Selenium TestNG - java.lang.NullPointerException
body: <p>I am trying to test the login function to Gmail. But it displays an exception error "java.lang.NullPointerException" . Code as follows:</p>
  
  <pre><code>    package gmail;
  
      import java.util.concurrent.TimeUnit;
  
      import org.junit.After;
      import org.junit.Before;
      import org.openqa.selenium.By;
      import org.openqa.selenium.WebDriver;
      import org.openqa.selenium.WebElement;
      import org.openqa.selenium.chrome.ChromeDriver;
      import org.testng.annotations.Test;
  
      public class Gmail {
          WebDriver driver;
  
          @Before 
          public void setup() {
          System.setProperty("webdriver.chrome.driver","E://chromedriver.exe");
          driver=new ChromeDriver();
          driver.get("https://accounts.google.com/");
          driver.manage().timeouts().implicitlyWait(300, TimeUnit.SECONDS);
          }
  
          @After
          public void quit() {
              driver.manage().deleteAllCookies();
              driver.quit();
          }
  
          @Test()
          public void login() {
  
              WebElement txtUserName=driver.findElement(By.name("Email"));
              txtUserName.sendKeys("abc@gmail.com");
  
              WebElement txtPassword=driver.findElement(By.name("Passwd"));
              txtPassword.sendKeys("abcd123");
  
              WebElement btnLogin=driver.findElement(By.name ("signIn"));
              btnLogin.submit();
              }
      }
  </code></pre>
  
  <p><strong>Error:</strong></p>
  
  <pre><code>FAILED: login
  java.lang.NullPointerException
      at gmail.Gmail.login(Gmail.java:33)
      at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
      at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
      at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
      at java.lang.reflect.Method.invoke(Unknown Source)
      at org.testng.internal.MethodInvocationHelper.invokeMethod(MethodInvocationHelper.java:84)
      at org.testng.internal.Invoker.invokeMethod(Invoker.java:714)
      at org.testng.internal.Invoker.invokeTestMethod(Invoker.java:901)
      at org.testng.internal.Invoker.invokeTestMethods(Invoker.java:1231)
      at org.testng.internal.TestMethodWorker.invokeTestMethods(TestMethodWorker.java:127)
      at org.testng.internal.TestMethodWorker.run(TestMethodWorker.java:111)
      at org.testng.TestRunner.privateRun(TestRunner.java:767)
      at org.testng.TestRunner.run(TestRunner.java:617)
      at org.testng.SuiteRunner.runTest(SuiteRunner.java:335)
      at org.testng.SuiteRunner.runSequentially(SuiteRunner.java:330)
      at org.testng.SuiteRunner.privateRun(SuiteRunner.java:291)
      at org.testng.SuiteRunner.run(SuiteRunner.java:240)
      at org.testng.SuiteRunnerWorker.runSuite(SuiteRunnerWorker.java:52)
      at org.testng.SuiteRunnerWorker.run(SuiteRunnerWorker.java:86)
      at org.testng.TestNG.runSuitesSequentially(TestNG.java:1224)
      at org.testng.TestNG.runSuitesLocally(TestNG.java:1149)
      at org.testng.TestNG.run(TestNG.java:1057)
      at org.testng.remote.RemoteTestNG.run(RemoteTestNG.java:111)
      at org.testng.remote.RemoteTestNG.initAndRun(RemoteTestNG.java:204)
      at org.testng.remote.RemoteTestNG.main(RemoteTestNG.java:175)
  </code></pre>
  
  <p>===============================================
      Default test</p>
  
  <h1>    Tests run: 1, Failures: 1, Skips: 0</h1>