How to click on allow button on popup window in selenium Webdriver by using Java

Question

I'm installing Firefox extension using automation. I'm using below code. but I'm getting an error.

enter image description here

package com.toolbar.pages;

import java.io.Console;

import org.openqa.selenium.Alert;
import org.openqa.selenium.By;
import org.openqa.selenium.WebDriver;
import org.openqa.selenium.firefox.FirefoxDriver;
import org.openqa.selenium.remote.DesiredCapabilities;
import org.sikuli.script.FindFailed;
import org.sikuli.script.ImagePath;
import org.sikuli.script.Pattern;
import org.sikuli.script.Screen;

public class FFInstallationpage {

	@SuppressWarnings("deprecation")
	public static void main(String[] args) throws FindFailed, InterruptedException {
		
		WebDriver driver;
		
		DesiredCapabilities capabilities = new DesiredCapabilities();
		
		System.setProperty("webdriver.gecko.driver", "/Users/venkata.b/Downloads/geckodriver");
		
		driver =new FirefoxDriver(capabilities);
   
        driver.manage().window().maximize();
        
        driver.get("https://toolbar.rakuten.co.jp/ff/");
      
        driver.findElement(By.xpath("//img[contains(@src,'https://image.infoseek.rakuten.co.jp/content/toolbar/ff/top/main_btn.png')]")).click();
        
        Thread.sleep(5000);
   
        driver.findElement(By.xpath("//img[contains(@src,'https://image.infoseek.rakuten.co.jp/content/toolbar/install_btn.gif')]")).click();
    
   
       
        Alert alert = driver.switchTo().alert();
        
        driver.switchTo().alert();
        
        alert.accept();

Error

Exception in thread "main" org.openqa.selenium.NoAlertPresentException: No modal dialog is currently open Build info: version: '3.7.1', revision: '8a0099a', time: '2017-11-06T21:07:31.527Z' System info: host: 'RINMAC297', ip: 'fe80:0:0:0:c44:2da2:148c:dc85%en0', os.name: 'Mac OS X', os.arch: 'x86_64', os.version: '10.12.6', java.version: '1.8.0_144' Driver info: org.openqa.selenium.firefox.FirefoxDriver Capabilities {acceptInsecureCerts: false, browserName: firefox, browserVersion: 57.0, javascriptEnabled: true, moz:accessibilityChecks: false, moz:headless: false, moz:processID: 8761, moz:profile: /var/folders/b0/rz6ystbx6q7..., moz:webdriverClick: false, pageLoadStrategy: normal, platform: MAC, platformName: MAC, platformVersion: 16.7.0, rotatable: false, timeouts: {implicit: 0, pageLoad: 300000, script: 30000}} Session ID: 3cb929c6-a392-b247-a6ec-72af24f1ab6f at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method) at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:62) at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45) at java.lang.reflect.Constructor.newInstance(Constructor.java:423) at org.openqa.selenium.remote.http.W3CHttpResponseCodec.createException(W3CHttpResponseCodec.java:187) at org.openqa.selenium.remote.http.W3CHttpResponseCodec.decode(W3CHttpResponseCodec.java:122) at org.openqa.selenium.remote.http.W3CHttpResponseCodec.decode(W3CHttpResponseCodec.java:49) at org.openqa.selenium.remote.HttpCommandExecutor.execute(HttpCommandExecutor.java:164) at org.openqa.selenium.remote.service.DriverCommandExecutor.execute(DriverCommandExecutor.java:83) at org.openqa.selenium.remote.RemoteWebDriver.execute(RemoteWebDriver.java:600) at org.openqa.selenium.remote.RemoteWebDriver.execute(RemoteWebDriver.java:657) at org.openqa.selenium.remote.RemoteWebDriver$RemoteTargetLocator.alert(RemoteWebDriver.java:986) at com.toolbar.pages.FFInstallationpage.main(FFInstallationpage.java:50)

Answer 1

If you expect alert but sometime it may not open.You can handle it using try and catch

try {
Alert alert = driver.switchTo().alert(); 

        driver.switchTo().alert(); 

        alert.accept(); 
}

catch (org.openqa.selenium.NoAlertPresentException e){
 System.out.println("No alert present");      
}