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java.lang.NullPointerException when using webdriver manager selenium java

While using selenium with java, WebdriverManager is not running and the below code is giving null pointer exception. I have returned the driver at end of class.
I have one ask whether should I keep the Webdriver driver as static or not.
import io.github.bonigarcia.wdm.WebDriverManager;
public class Browserselector {
public WebDriver driver;
public static Properties prop;
public WebDriver initializeDriver() throws IOException {
{
String browserName = "firefox";
System.out.println(browserName);
if (browserName.contains("Chrome")) {
WebDriverManager.chromedriver().setup();
driver = new ChromeDriver();
} else if (browserName.contains("IE")) {
WebDriverManager.iedriver().setup();
driver = new InternetExplorerDriver();
} else if (browserName.contains("FireFox")) {
WebDriverManager.firefoxdriver().setup();
driver = new FirefoxDriver();
} else if (browserName.contains("EDGE")) {
WebDriverManager.edgedriver().setup();
driver = new EdgeDriver();
}
}
driver.manage().timeouts().implicitlyWait(10, TimeUnit.SECONDS);
driver.manage().window().maximize();
driver.get("google.com");
return driver;
}
}
Thanks for your help in advance.

you are trying to start "firefox" - but the if condition checks for "Firefox", if you want to use it like that change the following condition
browserName.contains("FireFox")
into
browserName.equalsIgnoreCase("FireFox")
I recommend you to change the nested if with a "switch" it's more readable and easy to follow/understand
Also, don't use a URL without specifying the protocol
driver.get("https://www.google.com");

#beforetest testng its being ignored for some reason

I am running my Cucumber suite tests with TestNG (Selenium + Java) and getting java.lang.NullPointerException.
I realized the problem is that my #BeforeTest() is being ignored for some reason causing the NullPointer problem.
I am using the TestNG 7.0.0 (but tried to use latest Beta also).
#BeforeTest()
public void setUp() {
driver = Web.createChrome(); // it call a method that has the Chromedriver
}
Web.java
public class Web {
public static WebDriver createChrome() {
System.setProperty("webdriver.chrome.driver", webdriver_path);
WebDriver driver = new ChromeDriver();
driver.manage().window().maximize();
driver.manage().timeouts().pageLoadTimeout(30, TimeUnit.SECONDS);
driver.manage().timeouts().implicitlyWait(30, TimeUnit.SECONDS);
driver.get("http://the-internet.herokuapp.com/");
return driver;
}
}
Output
java.lang.NullPointerException
at br.dsanders.steps.steps.accessing_the_Tnternet_herokuapp_com_website(steps.java:62)
at ?.Given accessing the Tnternet.herokuapp.com website(testing.feature:9)

Try like below:
public class steps {
WebDriver driver = null;
public steps() {
this.driver=Web.createChrome();
}
#BeforeMethod()
public void setUp() {
driver.get("http://the-internet.herokuapp.com/");
}
}
Note ClassName here is steps if you have other class name then change the class name and constructor name.
Change the #BeforeTest to #BeforeMethod
Source:
What is the difference between BeforeTest and BeforeMethod in TestNG

org.openqa.selenium.SessionNotCreatedException: desired capabilities error

After the attempt to run my tests I always get:
org.openqa.selenium.SessionNotCreatedException: Unable to create new remote session. desired capabilities = Capabilities [{platformVersion=6.0, platformName=Android, deviceName=Xiomi}], required capabilities = Capabilities [{}]
java-client 5.0.0 beta 9
Appium 1.6.5
selenium standalone 3.4.0
Using Android Studio
public class MyTest1 {
AppiumDriver driver;
#Before
public void setUp() throws Exception {
DesiredCapabilities desiredCapabilities = new DesiredCapabilities();
desiredCapabilities.setCapability(MobileCapabilityType.PLATFORM_NAME, "Android");
desiredCapabilities.setCapability(MobileCapabilityType.DEVICE_NAME, "Xiomi");
desiredCapabilities.setCapability(MobileCapabilityType.PLATFORM_VERSION, "6.0");
URL url = new URL("http://127.0.0.1:4723/wd/hub");
driver = new AppiumDriver(url, desiredCapabilities);
}
#After
public void tearDown() throws Exception {
driver.quit();
}
#Test
public void Test(){
}
}
Please help! I can't understand what am I doing wrong

I've added next desired capabilities and exception stopped occurring:
desiredCapabilities.setCapability("appPackage", "com.package.app");
desiredCapabilities.setCapability("appActivity", ".activities.App");
// Add real app package and activity instead of mine.

Run exe file using selenium webdriver

How can I run exe file using selenium webdriver. If i can run the exe file then i can automate the windows window using auto it tool and can run those exe using java selenium. it would help in browsing the file in Selenium

Yes, you can do that.
Runtime.getRuntime().exec("path to the autoIt exe file");
Ex:
Runtime.getRuntime().exec("E:\\Softwares\\Testing\\FileIUploadAutoit.exe");
Here is the small example of uploading a file to website using Selenium WebDriver java using TestNG
public class autoitclass {
public WebDriver driver;
#BeforeTest
public void websitemain()
{
System.setProperty("webdriver.gecko.driver", "E:\\Softwares\\Testing\\geckodriver.exe");
driver = new FirefoxDriver();
driver.manage().timeouts().implicitlyWait(30, TimeUnit.SECONDS);
String URL = "http://www.megafileupload.com/";
driver.get(URL);
}
#Test
public void uploadFile() throws Throwable{
driver.findElement(By.xpath(".//a[contains(#class,'slider-btn')]")).click();
driver.findElement(By.xpath(".//*[#id='initialUploadSection']")).click();
Runtime.getRuntime().exec("E:\\Softwares\\Testing\\FileIUploadAutoit.exe");
}
#AfterTest
public void quit(){
driver.quit();
}

You cannot test standalone apps(desktop) using selenium(Some me please correct me if incorrect),exception being apps developed using Electron. When you compile and build an electron project you get an Exe which selenium can interact and test.
The following example demo how to interact :
public void TestSampleGooglePlayElectronApp()
{
ChromeOptions chromeOptions = new ChromeOptions();
chromeOptions.BinaryLocation = #"C:\MySampleElectronApp\MyApp.exe";
DesiredCapabilities capability = new DesiredCapabilities();
capability.SetCapability(CapabilityType.BrowserName, "Chrome");
capability.SetCapability("chromeOptions", chromeOptions);
IWebDriver driver = new ChromeDriver(chromeOptions);
driver.FindElement(By.XPath("//paper-button[contains(text(),'Sign in')]")).Click();
}

How to launch the Chrome Postman Plugin using Selenium Webdriver

ChromeDriver driver = new ChromeDriver();
ChromeOptions options=new ChromeOptions();
options.addArguments("chrome-extension://fdmmgilgnpjigdojojpjoooidkmcomcm/index.html");
driver = new ChromeDriver(options);
Tried using the above code.

You can open extension page using below code :
public class sample {
public static void main(String[] args) {
System.setProperty("webdriver.chrome.driver", "yourpath/chromedriver.exe");
WebDriver driver = new ChromeDriver();
driver.get("chrome://extensions/");
}
}
If you want to open plugin page then user below code :
public class sample {
public static void main(String[] args) {
System.setProperty("webdriver.chrome.driver", "yourpath/chromedriver.exe");
WebDriver driver = new ChromeDriver();
driver.get("https://chrome.google.com/webstore/search/postman?hl=en-US");
}
}
Note : if you have not downloaded "chromedriver" yet , then please download from HERE