Appium driver null pointer exception

Question

I am new to Appium and just getting started, I have been following an example and using a basic Contacts apk on Android tablet to start against. The code I have is pretty much copied from the example I am following but when I try to run the test I get a null pointer exception. I did some debugging and find that the driver = null is why I am getting this exception. I looked around and found some code that I thought might help but it hasn't.

The code I have is

import io.appium.java_client.AppiumDriver;
import io.appium.java_client.android.AndroidDriver;
import io.appium.java_client.remote.MobileCapabilityType;
import org.junit.After;
import org.junit.Before;
import org.openqa.selenium.WebElement;
import org.openqa.selenium.remote.DesiredCapabilities;
import org.testng.annotations.Test;
import java.util.concurrent.TimeUnit;
import java.net.MalformedURLException;
import java.net.URL;

public class addContact {

    AppiumDriver driver;

    @Before
    public void setUp () throws Exception {

        new DesiredCapabilities();
        DesiredCapabilities capabilities = DesiredCapabilities.android();
           capabilities.setCapability(MobileCapabilityType.DEVICE_NAME,"AndroidTestDevice");

        try
        {
            driver = new AndroidDriver(new URL("http://0.0.0.0:4723/wd/hub"), capabilities);
            driver.manage().timeouts().pageLoadTimeout(120, TimeUnit.SECONDS);

        }
        catch (MalformedURLException e)
        {
            System.out.println("URL init error");
        }

    }

    @After
    public void tearDown () throws Exception {
        driver.quit();
    }

    @Test
    public void addNewContact (){


     System.out.println (driver);
     WebElement addContactButton = driver.findElementById("com.example.android.contactmanager:id/addContactButton");
     addContactButton.click();
    }

}`

The exception I get is :

java.lang.NullPointerException
at addContact.addNewContact(addContact.java:49)

and the line this occurs in is :

WebElement addContactButton = driver.findElementById("com.example.android.contactmanager:id/addContactButton");

Is your setUp correctly called, and doesn't give a "URL init error" ? — Arnaud
– Arnaud, Commented Dec 22, 2015 at 15:27
Impossible to say why it's null from this code... There are many possibilities: setUp() isn't called (or is called pmöy after calling addNewContact(), not before), an Exception occured in the AppiumDriver constructor, etc.... — ParkerHalo
– ParkerHalo, Commented Dec 22, 2015 at 15:27
I thought setUp was always called first since its tagged @Before? Is that not the case? If not, that would certainly explain the problem I have but how do I force the setUp to execute first? — Nick Pilbeam
– Nick Pilbeam, Commented Dec 22, 2015 at 15:42
Possible duplicate of Null Pointer Exception Being returned - Java Selenium Webdriver — Saif Siddiqui
– Saif Siddiqui, Commented Sep 10, 2019 at 5:12

Gaurav · Accepted Answer · 2015-12-22 18:30:29Z

0

The reason it showing as null pointer because you are using "testng" annotation for "Tests" and "junit" annotation for "Before and after". Change import org.testng.annotations.Test; to import org.junit.Test; and run it as junit test.

This should work, just tested it on my side.

answered Dec 22, 2015 at 18:30

Gaurav

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1 Comment

Nick Pilbeam Over a year ago

Ahhhh... Thanks so much Gaurav!

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