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This usefulness assists with getting screen captures at run time when required, in especially when a disappointment occurs. With the assistance of screen captures and log messages, we will have the option to examine the outcomes better. 

Screen captures are designed contrastingly for neighborhood executions and Selenium Grid(remote) executions. Let us investigate every one them with a model. 

Localhost Execution

In the accompanying model, we will take a screen capture in the wake of computing the rate. Guarantee that you give a legitimate way to spare the screen capture. 

import java.io.File;
import java.io.IOException;
import java.util.concurrent.TimeUnit;

import org.apache.commons.io.FileUtils;
import org.openqa.selenium.*;
import org.openqa.selenium.firefox.FirefoxDriver;

public class WebdriverDemo {
   public static void main(String[] args) throws IOException {
      
      WebDriver driver = new FirefoxDriver();
      
      // Puts an Implicit wait, Will wait for 10 seconds before throwing exception
      driver.manage().timeouts().implicitlyWait(10, TimeUnit.SECONDS);
      
      // Launch website
      driver.navigate().to("http://www.calculator.net/");
      
      // Maximize the browser
      driver.manage().window().maximize();
      
      // Click on Math Calculators
      driver.findElement(By.xpath(".//*[@id = 'menu']/div[3]/a")).click();
      
      // Click on Percent Calculators
      driver.findElement(By.xpath(".//*[@id = 'menu']/div[4]/div[3]/a")).click();
      
      // Enter value 10 in the first number of the percent Calculator
      driver.findElement(By.id("cpar1")).sendKeys("10");
      
      // Enter value 50 in the second number of the percent Calculator
      driver.findElement(By.id("cpar2")).sendKeys("50");
      
      // Click Calculate Button 
      driver.findElement(By.xpath(".//*[@id = 'content']/table/tbody/tr/td[2]/input")).click();
      
      // Get the Result Text based on its xpath
      String result =
         driver.findElement(By.xpath(".//*[@id = 'content']/p[2]/span/font/b")).getText();
      
      File screenshot = ((TakesScreenshot)driver).getScreenshotAs(OutputType.FILE);
      
      FileUtils.copyFile(screenshot, new File("D:\\screenshots\\screenshots1.jpg"));
      
      // Print a Log In message to the screen
      System.out.println(" The Result is " + result);
      
      //Close the Browser.
      driver.close();
   }
}

Output

After executing the content, the screen capture is spared in the 'D:\screenshots' envelope with the name 'screenshots1.jpg' as demonstrated as follows. 

Selenium Grid Screenshot Capture

While working with Selenium Grids, we ought to guarantee that we are taking the screen captures effectively from the remote framework. We will utilize increased driver. 

Example

We will execute the content on a Firefox hub appended to a center point. For additional on arranging center point and hubs, if it's not too much trouble allude the Selenium Grids part. 

package TestNG;

import org.openqa.selenium.remote.Augmenter;
import org.openqa.selenium.remote.DesiredCapabilities;
import org.openqa.selenium.TakesScreenshot;
import org.openqa.selenium.*;

import org.testng.annotations.AfterTest;
import org.testng.annotations.BeforeTest;
import org.testng.annotations.Parameters;
import org.testng.annotations.Test;

import org.apache.commons.io.FileUtils;
import org.openqa.selenium.remote.RemoteWebDriver;

import java.util.concurrent.TimeUnit;
import java.io.File;
import java.net.URL;
import java.net.MalformedURLException;
import java.io.IOException;

public class TestNGClass {
   public WebDriver driver;
   public String URL, Node;
   protected ThreadLocal<RemoteWebDriver> threadDriver = null;
   
   @Parameters("browser")
   @BeforeTest
   public void launchapp(String browser) throws MalformedURLException {
      String URL = "http://www.calculator.net";
      
      if (browser.equalsIgnoreCase("firefox")) {
         System.out.println(" Executing on FireFox");
         String Node = "http://10.112.66.52:5555/wd/hub";
         DesiredCapabilities cap = DesiredCapabilities.firefox();
         cap.setBrowserName("firefox");
         driver = new RemoteWebDriver(new URL(Node), cap);
         
         // Puts an Implicit wait, Will wait for 10 seconds
         // before throwing exception
         driver.manage().timeouts().implicitlyWait(10, TimeUnit.SECONDS);
         
         // Launch website
         driver.navigate().to(URL);
         driver.manage().window().maximize();
      } else {
         throw new IllegalArgumentException("The Browser Type is Undefined");
      }
   }
   
   @Test
   public void calculatepercent() throws IOException {
      // Click on Math Calculators
      driver.findElement(By.xpath(".//*[@id = 'menu']/div[3]/a")).click();
      
      // Click on Percent Calculators
      driver.findElement(By.xpath(".//*[@id = 'menu']/div[4]/div[3]/a")).click();
      
      // Make use of augmented Driver to capture Screenshots.
      WebDriver augmentedDriver = new Augmenter().augment(driver);
      File screenshot = ((TakesScreenshot)augmentedDriver).getScreenshotAs(OutputType.FILE);
      FileUtils.copyFile(screenshot, new File("D:\\screenshots\\remotescreenshot1.jpg"));

      // Screenshot would be saved on the system where the script is executed and NOT on remote machine.
      
      // Enter value 10 in the first number of the percent Calculator
      driver.findElement(By.id("cpar1")).sendKeys("10");
      
      // Enter value 50 in the second number of the percent Calculator
      driver.findElement(By.id("cpar2")).sendKeys("50");
      
      // Click Calculate Button
      driver.findElement(By.xpath(".//*[@id = 'content']/table/tbody/tr/td[2]/input")).click();
      
      // Get the Result Text based on its xpath
      String result = driver.findElement(By.xpath(".//*[@id = 'content']/p[2]/span/font/b")).getText();

      // Print a Log In message to the screen
      System.out.println(" The Result is " + result);
      
      
      if(result.equals("5")) {
         System.out.println(" The Result is Pass");
      } else {
         System.out.println(" The Result is Fail");
      }
   }
   
   @AfterTest
   public void closeBrowser() {
      driver.quit();
   }
}

Output

After executing the content, the screen capture is caught and spared in the predefined area as demonstrated as follows.