AppiumDriver provides a null pointer exception

Question

In my appium + testng, the application I installed:

package com.tribehr.ios.ios_test; import java.net.URL; import io.appium.java_client.AppiumDriver; import org.junit.After; import org.junit.Before; import org.openqa.selenium.*; import org.openqa.selenium.remote.CapabilityType; import org.openqa.selenium.remote.DesiredCapabilities; import org.testng.annotations.Test; import org.testng.Assert; public class NewTest { private AppiumDriver driver; @Before public void setUp() throws Exception { // set up appium DesiredCapabilities capabilities = new DesiredCapabilities(); capabilities.setCapability(CapabilityType.BROWSER_NAME, ""); capabilities.setCapability("platformVersion", "7.1"); capabilities.setCapability("platformName", "iOS"); capabilities.setCapability("deviceName", "iPhone Simulator"); capabilities.setCapability("app", "/path to .app"); driver = new AppiumDriver(new URL("http://0.0.0.0:4723/wd/hub"), capabilities); } @After public void tearDown() throws Exception { driver.quit(); } @Test public void Test1() throws Exception { driver.findElement(By.xpath("//UIAApplication[1]/UIAWindow[1]/UIATextField[1]/UIATextField[1]")); } } 

The following stack trace is given:

 [TestNG] Running: /private/var/folders/hh/r5f5h1lx23g6drvycy03g29w0000gs/T/testng-eclipse--1877089062/testng-customsuite.xml FAILED: Test1 java.lang.NullPointerException at com.tribehr.ios.ios_test.NewTest.Test1(NewTest.java:39) at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) at java.lang.reflect.Method.invoke(Method.java:483) at org.testng.internal.MethodInvocationHelper.invokeMethod(MethodInvocationHelper.java:84) at org.testng.internal.Invoker.invokeMethod(Invoker.java:714) at org.testng.internal.Invoker.invokeTestMethod(Invoker.java:901) at org.testng.internal.Invoker.invokeTestMethods(Invoker.java:1231) at org.testng.internal.TestMethodWorker.invokeTestMethods(TestMethodWorker.java:127) at org.testng.internal.TestMethodWorker.run(TestMethodWorker.java:111) at org.testng.TestRunner.privateRun(TestRunner.java:767) at org.testng.TestRunner.run(TestRunner.java:617) at org.testng.SuiteRunner.runTest(SuiteRunner.java:334) at org.testng.SuiteRunner.runSequentially(SuiteRunner.java:329) at org.testng.SuiteRunner.privateRun(SuiteRunner.java:291) at org.testng.SuiteRunner.run(SuiteRunner.java:240) at org.testng.SuiteRunnerWorker.runSuite(SuiteRunnerWorker.java:52) at org.testng.SuiteRunnerWorker.run(SuiteRunnerWorker.java:86) at org.testng.TestNG.runSuitesSequentially(TestNG.java:1224) at org.testng.TestNG.runSuitesLocally(TestNG.java:1149) at org.testng.TestNG.run(TestNG.java:1057) at org.testng.remote.RemoteTestNG.run(RemoteTestNG.java:111) at org.testng.remote.RemoteTestNG.initAndRun(RemoteTestNG.java:204) at org.testng.remote.RemoteTestNG.main(RemoteTestNG.java:175) =============================================== Default test Tests run: 1, Failures: 1, Skips: 0 =============================================== =============================================== Default suite Total tests run: 1, Failures: 1, Skips: 0 =============================================== [TestNG] Time taken by org.testng.reporters.SuiteHTMLReporter@7b1d7fff : 23 ms [TestNG] Time taken by org.testng.reporters.jq.Main@7b3300e5 : 28 ms [TestNG] Time taken by [FailedReporter passed=0 failed=0 skipped=0]: 2 ms [TestNG] Time taken by org.testng.reporters.EmailableReporter2@2ff5659e : 4 ms [TestNG] Time taken by org.testng.reporters.XMLReporter@43556938 : 4 ms [TestNG] Time taken by org.testng.reporters.JUnitReportReporter@57fa26b7 : 2 ms 

It seems that the Appium server was not successfully created with the feature, but it is almost a copy and paste of examples on the Internet - and I cannot understand what went wrong.

Answer 1

Surround "driver" with an if statement to see if it is == null.

 if(driver!=null){ System.out.println("driver does not == null"); driver.findElement(By.xpath("YourXpath")); } else { System.out.println("driver == null") } 

Here are my options. Working with appium 1.2 *

 public WebDriver appiumCapabilities() { File appDir = new File(System.getProperty("user.dir"), "/app/"); File app = new File(appDir, "test.app"); DesiredCapabilities capabilities = new DesiredCapabilities(); capabilities.setCapability(CapabilityType.BROWSER_NAME, "iOS"); capabilities.setCapability(CapabilityType.PLATFORM, "Mac"); capabilities.setCapability("platformName", "iOS"); capabilities.setCapability("deviceName", "iPod"); capabilities.setCapability("platformVersion", "7.1"); capabilities.setCapability("device", "iphone"); capabilities.setCapability("udid", "cd827d3778cfdee2fc7210f8f44184821a083c06"); capabilities.setCapability("app", app); try { driver = new RemoteWebDriver(new URL("http://0.0.0.0:4723/wd/hub"), capabilities); } catch (MalformedURLException e) { e.printStackTrace(); } return driver; }