No such element - exception Selenium

[Dana Ucaed]

Hello,

The same test case works well sometimes, sometimes fails.

This is the error message :

No such element (WARNING: The server did not provide any stacktrace information) Command duration or timeout: 15.29 seconds For documentation on this error, please visit: http://seleniumhq.org/exceptions/no_such_element.html Build info: version: '2.53.0', revision: '35ae25b', time: '2016-03-15 17:00:58' System info: host: '185-129-71-57', ip: '185.129.71.57', os.name: 'windows', os.arch: 'x86', os.version: '10.0', java.version: '1.8.0_121' Driver info: org.openqa.selenium.edge.EdgeDriver Capabilities [{applicationCacheEnabled=true, acceptSslCerts=true, browserVersion=38.14393.0.0, platformVersion=10, locationContextEnabled=true, webStorageEnabled=true, browserName=MicrosoftEdge, takesScreenshot=true, pageLoadStrategy=normal, takesElementScreenshot=true, platformName=windows, platform=ANY}] Session ID: 5C94189C-E152-4957-9AE9-0F0431A7A3A9 *** Element info: {Using=xpath, value=//input[@id='login-signin']}

See attached my test case successful.

The video file for failed test case is too big.

What is the reason?

[Chris Barrett]

Hi Dana,

As the exception name would indicate, NoSuchElementException, usually means that the element wasn't present on the page when Selenium attempted to find it.
(Link here to the  org.openqa.selenium.NoSuchElementException API as the link above will go to  java.util.NoSuchElementException ).

Two common reasons:

It's a totally valid error. Someone changed the page and either deleted the element or accidentally changed the id. If that was the case, you would want to know.  

Selenium tried processing the page before the page was fully loaded.

In your case, since the test sometimes pass, I would think it's the second reason.

Are you using a WebDriverWait statement to make sure the element has loaded before Selenium attempts to access?

WebDriverWait wait = new WebDriverWait(webDriver, timeoutInSeconds);
wait.until(ExpectedConditions.visibilityOfElementLocated(By.id<locator>));

While you could use that to reference the specific id in question, a better approach is to put at the very bottom of the page (usually through a shared footer or something just before the </body>) a placeholder id for WebDriverWait to hook into:
<div id="wait_holder"></div>

Cheers!

[Dana Ucaed]

I modified the catch block:

import java.util.concurrent.TimeUnit;

import org.junit.After;
import org.junit.AfterClass;
import org.junit.Assert;
import org.junit.Before;
import org.junit.Test;
import org.openqa.selenium.By;
import org.openqa.selenium.WebDriver;
import org.openqa.selenium.WebElement;
import org.openqa.selenium.edge.*;
import org.openqa.selenium.interactions.Actions;
import org.openqa.selenium.remote.CapabilityType;
import org.openqa.selenium.remote.DesiredCapabilities;

import com.gargoylesoftware.htmlunit.javascript.background.JavaScriptExecutor;

public class LoginYahooSuccess {

	private WebDriver driver;

	@AfterClass
	public static void tearDownAfterClass() throws Exception {
	}

	@Before
	public void setUp() throws Exception {
		if (driver != null) {
			driver.quit();
		}
		System.setProperty("webdriver.edge.driver",
				"D:\\Documentatie\\Selenium\\MicrosoftWebDriver.exe");
		DesiredCapabilities capabilities = DesiredCapabilities.edge();
		capabilities.setCapability(CapabilityType.SUPPORTS_APPLICATION_CACHE,
				false);

		driver = new EdgeDriver(capabilities);
		capabilities.setCapability("platform", "Win10");
		capabilities.setCapability("browser", "Edge");
		capabilities.setCapability("acceptSslCerts", "true");
		capabilities.setCapability(CapabilityType.PAGE_LOAD_STRATEGY, "eager");
		capabilities.setCapability("os", "Windows");
		capabilities.setCapability("os_version", "10");
		driver.manage().timeouts().implicitlyWait(30, TimeUnit.SECONDS);
		driver.manage().window().maximize();
	}

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

	@Test
	public void test() throws Exception {
		try {

			driver.get("https://mail.yahoo.com");
			driver.manage().window().maximize();
			// Add account
			WebElement AddAccountbtn = driver.findElement(By
					.className("add_account"));

			AddAccountbtn.click();

			WebElement usernameElem = driver.findElement(By
					.id("login-username"));
			usernameElem.sendKeys("[e-mail]");

			WebElement nextPass;

			nextPass = this.driver.findElement(By
					.xpath("//button[@id='login-signin']"));
			nextPass.click();

			WebElement passwordElem = this.driver.findElement(By
					.id("login-passwd"));

			// Actions builder = new Actions(driver);
			// builder.moveToElement(passwordElem);
			// builder.perform();
			passwordElem.sendKeys("");

			WebElement login = driver.findElement(By.id("login-signin"));

			login.submit();
			// driver.manage().timeouts().implicitlyWait(5, TimeUnit.SECONDS);
			// login.click();
			WebElement HiElem = driver.findElement(By
					.id("yui_3_10_3_1_1375219693637_127"));

			Assert.assertEquals("Anda", HiElem.getText());
		} catch (Throwable ex) {
			ex.printStackTrace();
			Throwable t = ex.getCause();
			//t.initCause(t);
			//t.printStackTrace();

		}
	}

}

and the real cause is below:

[20:59:02.793] - Listening on http://localhost:47719/ 

May 27, 2017 8:59:04 PM org.openqa.selenium.remote.ProtocolHandshake createSession
INFO: Detected dialect: OSS
org.openqa.selenium.NoSuchElementException: No such element (WARNING: The server did not provide any stacktrace information)
Command duration or timeout: 30.02 seconds
For documentation on this error, please visit: http://seleniumhq.org/exceptions/no_such_element.html
Build info: version: '3.4.0', revision: 'unknown', time: 'unknown'
System info: host: 'TERMINATOR', ip: '192.168.1.109', os.name: 'Windows 10', os.arch: 'amd64', os.version: '10.0', java.version: '1.8.0_131'
Driver info: org.openqa.selenium.edge.EdgeDriver
Capabilities [{applicationCacheEnabled=true, pageLoadStrategy=normal, platform=ANY, acceptSslCerts=true, browserVersion=38.14393.1066.0, platformVersion=10, locationContextEnabled=true, webStorageEnabled=true, browserName=MicrosoftEdge, takesScreenshot=true, takesElementScreenshot=true, javascriptEnabled=true, platformName=windows}]
Session ID: 52F79311-4C8C-478B-8C42-A8D110E0B97A
*** Element info: {Using=id, value=yui_3_10_3_1_1375219693637_127}
	at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
	at sun.reflect.NativeConstructorAccessorImpl.newInstance(Unknown Source)
	at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(Unknown Source)
	at java.lang.reflect.Constructor.newInstance(Unknown Source)
	at org.openqa.selenium.remote.ErrorHandler.createThrowable(ErrorHandler.java:215)
	at org.openqa.selenium.remote.ErrorHandler.throwIfResponseFailed(ErrorHandler.java:167)
	at org.openqa.selenium.remote.RemoteWebDriver.execute(RemoteWebDriver.java:671)
	at org.openqa.selenium.remote.RemoteWebDriver.findElement(RemoteWebDriver.java:410)
	at org.openqa.selenium.remote.RemoteWebDriver.findElementById(RemoteWebDriver.java:453)
	at org.openqa.selenium.By$ById.findElement(By.java:218)
	at org.openqa.selenium.remote.RemoteWebDriver.findElement(RemoteWebDriver.java:402)
	at LoginYahooSuccess.test(LoginYahooSuccess.java:88)
	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
	at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
	at java.lang.reflect.Method.invoke(Unknown Source)
	at org.junit.runners.model.FrameworkMethod$1.runReflectiveCall(FrameworkMethod.java:50)
	at org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:12)
	at org.junit.runners.model.FrameworkMethod.invokeExplosively(FrameworkMethod.java:47)
	at org.junit.internal.runners.statements.InvokeMethod.evaluate(InvokeMethod.java:17)
	at org.junit.internal.runners.statements.RunBefores.evaluate(RunBefores.java:26)
	at org.junit.internal.runners.statements.RunAfters.evaluate(RunAfters.java:27)
	at org.junit.runners.ParentRunner.runLeaf(ParentRunner.java:325)
	at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:78)
	at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:57)
	at org.junit.runners.ParentRunner$3.run(ParentRunner.java:290)
	at org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:71)
	at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:288)
	at org.junit.runners.ParentRunner.access$000(ParentRunner.java:58)
	at org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:268)
	at org.junit.internal.runners.statements.RunAfters.evaluate(RunAfters.java:27)
	at org.junit.runners.ParentRunner.run(ParentRunner.java:363)
	at org.eclipse.jdt.internal.junit4.runner.JUnit4TestReference.run(JUnit4TestReference.java:50)
	at org.eclipse.jdt.internal.junit.runner.TestExecution.run(TestExecution.java:38)
	at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:467)
	at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:683)
	at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.run(RemoteTestRunner.java:390)
	at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.main(RemoteTestRunner.java:197)
[20:59:40.592] - Stopping server.

So, is ignored sendkeys for password, but Selenium search *** Element info: {Using=id, value=yui_3_10_3_1_1375219693637_127} on page where I write the password.

I am very disappointed because I don't understand this behaviour.

My test stays on the page where I can introduce my password, but search   the element info: {Using=id, value=yui_3_10_3_1_1375219693637_127} that exists on the nest web page.

I will ask Microsoft Edge team about this situation.

[Dana Ucaed]

If in my catch block write

catch (Throwable ex) {
			ex.printStackTrace();
			Throwable t = ex.getCause();
			t.initCause(t);
}

java.lang.NullPointerException
at LoginYahooSuccess.test(LoginYahooSuccess.java:95)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
at java.lang.reflect.Method.invoke(Unknown Source)
at org.junit.runners.model.FrameworkMethod$1.runReflectiveCall(FrameworkMethod.java:50)
at org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:12)
at org.junit.runners.model.FrameworkMethod.invokeExplosively(FrameworkMethod.java:47)
at org.junit.internal.runners.statements.InvokeMethod.evaluate(InvokeMethod.java:17)
at org.junit.internal.runners.statements.RunBefores.evaluate(RunBefores.java:26)
at org.junit.internal.runners.statements.RunAfters.evaluate(RunAfters.java:27)
at org.junit.runners.ParentRunner.runLeaf(ParentRunner.java:325)
at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:78)
at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:57)
at org.junit.runners.ParentRunner$3.run(ParentRunner.java:290)
at org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:71)
at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:288)
at org.junit.runners.ParentRunner.access$000(ParentRunner.java:58)
at org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:268)
at org.junit.internal.runners.statements.RunAfters.evaluate(RunAfters.java:27)
at org.junit.runners.ParentRunner.run(ParentRunner.java:363)
at org.eclipse.jdt.internal.junit4.runner.JUnit4TestReference.run(JUnit4TestReference.java:50)
at org.eclipse.jdt.internal.junit.runner.TestExecution.run(TestExecution.java:38)
at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:467)
at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:683)
at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.run(RemoteTestRunner.java:390)
at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.main(RemoteTestRunner.java:197)