package Testing_Pack;

import java.util.concurrent.TimeUnit;
import org.openqa.selenium.By;
import org.openqa.selenium.Keys;
import org.openqa.selenium.WebDriver;
import org.openqa.selenium.WebElement;
import org.openqa.selenium.firefox.FirefoxDriver;
import org.testng.annotations.BeforeTest;
import org.testng.annotations.Test;

public class StaleElement {
 WebDriver driver;
 @BeforeTest
 public void setup() throws Exception {
  driver =new FirefoxDriver();     
  driver.manage().window().maximize();
  driver.manage().timeouts().implicitlyWait(10, TimeUnit.SECONDS);
  driver.get("http://www.github.com");
 }
 
 @Test
 public void getExe() throws InterruptedException{  
  //Located element and stored It's reference In variable.
  WebElement Search_Box = driver.findElement(By.xpath("//input[@name='q']"));
  //Used element reference variable to locate element and perform search.
  Search_Box.sendKeys("Hello");
  Search_Box.sendKeys(Keys.ENTER);
  Thread.sleep(5000);
  
  //After search operation, Element's position Is changed.
  //Now I am using same reference variable to clear search text box.
  //So here, WebDriver will be not able to locate element using same reference and It will throw StaleElementReferenceException.
  Search_Box.clear();  
 }
}

Proposed Solution 1 :
Create a function and perform text box clear operation Inside It as shown In bellow example using while loop. Replace @Test method of above example with bellow given.

@Test
 public void getExe() throws InterruptedException {
  // Located element and stored It's reference In variable.
  WebElement Search_Box = driver.findElement(By.xpath("//input[@name='q']"));
  // Used element reference variable to locate element and perform search.
  Search_Box.sendKeys("Hello");
  Search_Box.sendKeys(Keys.ENTER);
  Thread.sleep(5000);

  // After search operation, Element's position Is changed.
  //Call function with element name to perform clear operation.
  handleStaleElement("q");
 }

 // This function will handle stalelement reference exception
 public void handleStaleElement(String elementName) {
  int count = 0;
  //It will try 4 times to find same element using name.
  while (count < 4) {
   try {
    //If exception generated that means It Is not able to find element then catch block will handle It.
    WebElement staledElement = driver.findElement(By.name(elementName));
    //If exception not generated that means element found and element text get cleared.
    staledElement.clear();    
   } catch (StaleElementReferenceException e) {
    e.toString();
    System.out.println("Trying to recover from a stale element :" + e.getMessage());
    count = count + 1;
   }
   count = count + 4;
  }
 }

Proposed Solution 2 :
You can do same thing using for loop Inside @Test method as bellow.

@Test
 public void getExe() throws InterruptedException {
  // Located element and stored It's reference In variable.
  WebElement Search_Box = driver.findElement(By.xpath("//input[@name='q']"));
  // Used element reference variable to locate element and perform search.
  Search_Box.sendKeys("Hello");
  Search_Box.sendKeys(Keys.ENTER);
  Thread.sleep(5000);

  // After search operation, Element's position Is changed.
  //use for loop.
  for(int i=0; i<4;i++)
            try {
             driver.findElement(By.xpath("//input[@name='q']")).clear();
                break;
            } catch(StaleElementReferenceException e) {
              e.toString();
        System.out.println("Trying to recover from a stale element :" + e.getMessage());
          
        }
 }