Getting null pointer exception when tried running two classes for two pages (login page and home page)

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On running single class it run's fine but when i run two classes of (Login and Home page) it throws null pointer exception, it seem's that something has gone wrong for the second class, Kindly help me to solve this, Thanks in advance.

package Utilities;

import java.util.concurrent.TimeUnit;

import org.openqa.selenium.WebDriver;
import org.openqa.selenium.chrome.ChromeDriver;
import org.openqa.selenium.firefox.FirefoxDriver;

public class Browserfctry {

	public static WebDriver startApplication(WebDriver dr, String browsername, String url)

	{
		if (browsername.equals("chrome")) {
			System.setProperty("webdriver.chrome.driver", "/home/ibrahim/eclipse-workspace/chromedriver");
			dr = new ChromeDriver();
		} else if (browsername.equals("firefox")) {
			System.setProperty("webdriver.gecko.driver", "/home/ibrahim/eclipse-workspace/geckodriver");
			dr = new FirefoxDriver();
		} else {
			System.out.println("we do not support this browser");
		}
		dr.manage().timeouts().pageLoadTimeout(30, TimeUnit.SECONDS);
		dr.manage().window().maximize();
		dr.get(url);
		dr.manage().timeouts().implicitlyWait(30, TimeUnit.SECONDS);
		return dr;

	}

//	public static void quitbrowser(WebDriver dr)
//	{
//	dr.quit();
//	
}

What I have tried:

My base class:

package Pages;

import org.openqa.selenium.WebDriver;
import org.testng.annotations.BeforeSuite;

import Utilities.Browserfctry;

public class BaseClass {
	public WebDriver dr;

	@BeforeSuite
	public void start() {
		dr = Browserfctry.startApplication(dr, "chrome", "http://192.168.11.92:3003");
	}

//@AfterClass
//	public void terminate()
//	{
//		Browserfctry.quitbrowser(dr);
//		
//	}
}

My home page class

package Pages;

import org.openqa.selenium.WebDriver;
import org.openqa.selenium.WebElement;
import org.openqa.selenium.support.FindBy;

public class HomePageTR {
	WebDriver driver;

	public HomePageTR(WebDriver dr) {
		this.driver = dr;
	}

	@FindBy(xpath = "//span[@class='glyphicon glyphicon-th']")
	WebElement Homemenuicon;

	@FindBy(xpath = "//span[@class='glyphicon glyphicon-user']")
	WebElement Profileicon;

	@FindBy(xpath = "//span[@class='glyphicon glyphicon-cog']")
	WebElement Settingsicon;

	@FindBy(xpath = "//span[@class='glyphicon glyphicon-off']")
	WebElement Logouticon;

	@FindBy(xpath = "//span[@class='glyphicon glyphicon-menu-left']")
	WebElement Sidemenucollider;

	@FindBy(xpath = "//li[@data-section='dataset']")
	WebElement SDMDataAccessicon;

	@FindBy(xpath = "//li[@data-section='metadataWizard']")
	WebElement SDMMetadataicon;

	@FindBy(xpath = "//li[@data-section='analysisWizard']")
	WebElement SDMMotifexplorericon;

	@FindBy(xpath = "(//img)[@src='/images/home/library.png'][1]")
	WebElement SDMMotiflibrary;

	@FindBy(xpath = "//li[@data-section='dashboardSelect']")
	WebElement SDMDashboards;

	@FindBy(xpath = "//a[@data-section='dataset']")
	WebElement Dataaccessicon;

	@FindBy(xpath = "//a[@data-section='metadataWizard']")
	WebElement Metadataicon;

	@FindBy(xpath = "//a[@data-section='analysisWizard']")
	WebElement Motifexplorericon;

	@FindBy(xpath = "//a[@data-section='browser']")
	WebElement Motiflibraryicon;

	@FindBy(xpath = "//a[@data-section='dashboardSelect']")
	WebElement Dashboardicon;

//nextpage reference objects

	@FindBy(xpath = "//a[@data-name='dataAccess']")
	WebElement dataaccesrfrnc;

	@FindBy(xpath = "//div[@class='main-menu-logo']")
	WebElement Logo;

	@FindBy(xpath = "//div[@class='row icon-row']")
	WebElement d1;

	public String dataiconchk() throws InterruptedException {
		Thread.sleep(3000);

		System.out.println(d1.isDisplayed());
		System.out.println(Dataaccessicon.isDisplayed());
		System.out.println("dataicon reached");
		Dataaccessicon.click();
		System.out.println("datacliked");
		String chumma = dataaccesrfrnc.getText();
		return chumma;

	}

}

My home page Test case

package Testcases;

import org.openqa.selenium.support.PageFactory;
import org.testng.Assert;
import org.testng.annotations.Test;

import Pages.BaseClass;
import Pages.HomePageTR;

public class HomePageTestTR extends BaseClass {
	HomePageTR homepagetr;

	@Test(priority = 6)
	public void dataiconchk() throws InterruptedException {

		homepagetr = PageFactory.initElements(dr, HomePageTR.class);
		String dataaccessheader = homepagetr.dataiconchk();

		Assert.assertEquals(dataaccessheader, "Data Access");

		System.out.println("data acces icon checked");

	}

}

My error:

dataiconchk
java.lang.NullPointerException
	at org.openqa.selenium.support.pagefactory.DefaultElementLocator.findElement(DefaultElementLocator.java:69)
	at org.openqa.selenium.support.pagefactory.internal.LocatingElementHandler.invoke(LocatingElementHandler.java:38)
	at com.sun.proxy.$Proxy8.isDisplayed(Unknown Source)
	at Pages.HomePageTR.dataiconchk(HomePageTR.java:77)
	at Testcases.HomePageTestTR.dataiconchk(HomePageTestTR.java:18)
... Removed 25 stack frames

Posted 11-Mar-19 3:59am

Member 14178290

Updated 11-Mar-19 5:20am

v2

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Comments

Richard MacCutchan 11-Mar-19 10:08am

You need to track back through the stack trace to find where in your code is the call that led to the exception. You should then be able to identify which variable is null.

[no name] 11-Mar-19 10:42am

Do you need to maintain a reference to "each class you are running"? Or is this "fire and forget"?

2 solutions

Solution 1

This is one of the most common problems we get asked, and it's also the one we are least equipped to answer, but you are most equipped to answer yourself.

Let me just explain what the error means: You have tried to use a variable, property, or a method return value but it contains null - which means that there is no instance of a class in the variable.
It's a bit like a pocket: you have a pocket in your shirt, which you use to hold a pen. If you reach into the pocket and find there isn't a pen there, you can't sign your name on a piece of paper - and you will get very funny looks if you try! The empty pocket is giving you a null value (no pen here!) so you can't do anything that you would normally do once you retrieved your pen. Why is it empty? That's the question - it may be that you forgot to pick up your pen when you left the house this morning, or possibly you left the pen in the pocket of yesterdays shirt when you took it off last night.

We can't tell, because we weren't there, and even more importantly, we can't even see your shirt, much less what is in the pocket!

Back to computers, and you have done the same thing, somehow - and we can't see your code, much less run it and find out what contains null when it shouldn't.
But you can - run your program in the debugger and when it fails, the debugger will show you the line it found the problem on. You can then start looking at the various parts of it to see what value is null and start looking back through your code to find out why. So put a breakpoint at the beginning of the method containing the error line, and run your program from the start again. This time, it will stop before the error, and let you examine what is going on by stepping through the code looking at your values.

But we can't do that - we don't have your code, we don't know how to use it if we did have it, we don't have your data. So try it - and see how much information you can find out!

Posted 11-Mar-19 5:00am

OriginalGriff

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Richard MacCutchan · Accepted Answer · 2019-03-11T05:20:00

Solution 2

Java

homepagetr = PageFactory.initElements(dr, HomePageTR.class);
String dataaccessheader = homepagetr.dataiconchk();

At a rough guess one of the above methods does not return a valid reference. Something your code fails to check for.

Posted 11-Mar-19 5:20am

Richard MacCutchan