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How to get the frame and switch to in Selenium Java?

I've been spending more than an hour to find similar cases but nothing helpful. I am new to Java and Selenium and only one member who develops the Selenium Automation script at the moment.
Okay, the target system's HTML code structure is as below.
What I did to click on the element on the topframe is, for example, (simplified snippet);
Page page = new Page();
page.setTopFrame();
page.a_button.click();
class Page{
#FindBy(id="a_button")
public WebElement a_button;
public void setTopFrame() {
driver.switchTo().frame("topframe");
}
}
But when I run this codes it returns "org.openqa.selenium.NoSuchElementException" Exception.
I don't know what I am missing now. Any advice will be thankful.
--Edited--
Since I post this one, other Exception found which is "NullPointerException: Cannot invoke "org.openqa.selenium.SearchContext.findElement(org.openqa.selenium.By)" because "this.searchContext" is null.
The constructor in Page class should initialised with driver from main Test class. Be like.
Page page = new Page(driver);
And Page class has
class Page{
WebDriver driver;
public Page (WebDriver driver){
this.driver = driver;
PageFactory.initElements(driver, this);
}
...
}

Maybe you are currently in another frame. So try:
public void setTopFrame() {
driver.switchTo().defaultContent();
driver.switchTo().frame("topframe");
}

Page class{
WebDriver driver;
public Page (WebDriver driver){
this.driver = driver;
PageFactory.initElements(driver, this);
}
...
}
Thank you all read my question.
I hope this answer help someone in trouble with same issue.

Driver giving Null point exception

The below code was trying to run without example keyword in cucumber, but the output is dispalying as a Null pointer error
WebDriver driver;
#Given("^user is alredy in login page$")
public void user_is_alredy_in_login_page() {
System.setProperty("webdriver.chrome.driver", "C:\\Users\\swagatika.mohapatra\\OneDrive - Qualitest Group\\Desktop\\selenium\\DRIVER\\D-v-88-chrome\\chromedriver.exe");
WebDriver driver = new ChromeDriver();
driver.get("https://opensource-demo.orangehrmlive.com/");
driver.manage().window().maximize();
}
#Given("^user enters \"(.*)\" and \"(.*)\"$")
public void user_enters_valid_user_name(String username, String password) {
this.driver = driver;
driver.findElement(By.id("txtUsername")).sendKeys(username);
driver.findElement(By.id("txtPassword")).sendKeys(password);
}
console output in Debug mode -
this = {LoginStepDefination#3223}
driver = null
username = "Admin"
password = "admin123"
this.driver = null
driver = null

WebDriver driver = new ChromeDriver();
you are redeclaring driver as a local varaible in first step instead:
WebDriver driver;
#Given("^user is alredy in login page$")
public void user_is_alredy_in_login_page() {
System.setProperty("webdriver.chrome.driver", "C:\\Users\\swagatika.mohapatra\\OneDrive - Qualitest Group\\Desktop\\selenium\\DRIVER\\D-v-88-chrome\\chromedriver.exe");
driver = new ChromeDriver();
driver.get("https://opensource-demo.orangehrmlive.com/");
driver.manage().window().maximize();
}
#Given("^user enters \"(.*)\" and \"(.*)\"$")
public void user_enters_valid_user_name(String username, String password) {
this.driver.findElement(By.id("txtUsername")).sendKeys(username);
this.driver.findElement(By.id("txtPassword")).sendKeys(password);
}

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

Selenium PageObject throws Invocation Target Exception

I am trying to create a framework(Selenium+TestNg+java) for a Web app(The environment is MacOs+ChromeDriver and the driver server is in \usr\local\bin) but got stuck in basic structure. I have a class(Driversetup.java) that starts the browser, another one that contains WebElements and methods(ProfileUpdateObjects.java) and the third one containing test methods. Now, when I try to run this TestNG class having just a single method, I get following exception.
java.lang.RuntimeException: java.lang.reflect.InvocationTargetException
at org.openqa.selenium.support.PageFactory.instantiatePage(PageFactory.java:138).
Below is the code (All the classes are in different packages).
public class ProfileUpdateTest {
#Test(enabled = true, priority = 1)
public void profileUpdate() throws MalformedURLException, InterruptedException, ParseException {
WebDriver driver = DriverSetup.startBrowser("chrome");
ProfileUpdateObjects pu = PageFactory.initElements(driver, ProfileUpdateObjects.class);
pu.navigateProfile();
}
}
The code for ProfileUpdateObject class
public class ProfileUpdateObjects {
WebDriver driver;
public ProfileUpdateObjects(WebDriver cdriver) {
this.driver = cdriver;
}
#FindBy(xpath = " //div[#class='ico-menu']")
private WebElement menu;
#FindBy(xpath = "//a[#title='My Dashboard']")
private WebElement myDashboard;
#FindBy(xpath = " //a[contains(text(),'View Profile')]")
public WebElement profile;
#FindBy(xpath = "//li[contains(text(),'Permanent Address')]")
private WebElement permanentAddress;
#FindBy(xpath = "//li[contains(text(),'Banking Information')]")
private WebElement bankingInformation;
WebDriverWait waitfor = new WebDriverWait(driver, 2000);
public void navigateProfile() throws InterruptedException {
menu.click();
profile.click();
waitfor.until(ExpectedConditions.visibilityOf(permanentAddress));
}
}
DriverSetup.java
public class DriverSetup {
public static WebDriver driver;
public static WebDriver startBrowser(String browserName, String url) {
if (browserName.equalsIgnoreCase("chrome")) {
driver = new ChromeDriver();
}
driver.manage().window().maximize();
driver.get(url);
return driver;
}
}
It is failing in pu.navigateProfile() call. Also, is it true that #FindBy takes more memory compared to driver.find() syntax and besides POM are there any other design principles for Automation framework because most of the resources over Web are one or the other implementation of POM.

Simple solution is to move new WebDriverWait. It should not be instantiated as instance variable.
Instead of:
WebDriverWait waitfor = new WebDriverWait(driver, 2000);
public void navigateProfile() throws InterruptedException {
menu.click();
profile.click();
waitfor.until(ExpectedConditions.visibilityOf(permanentAddress));
}
Use:
public void navigateProfile() {
menu.click();
profile.click();
new WebDriverWait(driver, 2000).until(ExpectedConditions.visibilityOf(permanentAddress));
}
This will solve your issue (Already tested it)