java - 获取异常 : selenium. NoSuchSessionException : Session ID is null. 这里我使用 Localthread 进行并行执行

Question

**出现以下异常:org.openqa.selenium.NoSuchSessionException: session ID 为空。调用 quit() 后使用 WebDriver？在这里，我使用 LocalThread 进行并行测试执行，但是在一个线程中的类中运行多个测试时(不是并行执行)第一个测试用例成功运行，第二个和第三个测试用例失败**

Console Output:

[TestNG] Running:
  C:\Users\Afsar\AppData\Local\Temp\testng-eclipse--442788521\testng-customsuite.xml

****** In Before Method init method *********
Driver instanceis created and  set current local thread
Starting ChromeDriver 2.33.506120 (e3e53437346286c0bc2d2dc9aa4915ba81d9023f) on port 41879
Only local connections are allowed.
log4j:WARN No appenders could be found for logger (org.apache.http.client.protocol.RequestAddCookies).
log4j:WARN Please initialize the log4j system properly.
log4j:WARN See http://logging.apache.org/log4j/1.2/faq.html#noconfig for more info.
Oct 22, 2017 5:03:12 PM org.openqa.selenium.remote.ProtocolHandshake createSession
INFO: Detected dialect: OSS
Set current thread method is called ..
Get curent thread method is called ..
Current thread id :1 thread name is :main
Get curent thread method is called ..
Current thread id :1 thread name is :main
Get curent thread method is called ..
Current thread id :1 thread name is :main
*********Running first Test Case *********
Get curent thread method is called ..
Current thread id :1 thread name is :main
Get curent thread method is called ..
Current thread id :1 thread name is :main
**** Executing Logine Action *********
URL is sent succesfully..
Clicked on the Sign -on button 
User name Entered 
Password entered 
Sign -in clicked 
****** Executing Register Action *********
Get curent thread method is called ..
Current thread id :1 thread name is :main
Register button is found 
PASSED : First test case : Login Successful..
****** In After Method tear down *********
Removing driver instance from current thread and closing all sesions
driver.quite called 
****** In Before Method init method *********
Driver instanceis created and  set current local thread
Starting ChromeDriver 2.33.506120 (e3e53437346286c0bc2d2dc9aa4915ba81d9023f) on port 47720
Only local connections are allowed.
Oct 22, 2017 5:03:39 PM org.openqa.selenium.remote.ProtocolHandshake createSession
INFO: Detected dialect: OSS
Set current thread method is called ..
Get curent thread method is called ..
Current thread id :1 thread name is :main
Get curent thread method is called ..
Current thread id :1 thread name is :main
Get curent thread method is called ..
Current thread id :1 thread name is :main
*********Running second Test Case *********
**** Executing Logine Action *********
URL is sent succesfully..
****** In After Method tear down *********
Removing driver instance from current thread and closing all sesions
driver.quite called 
****** In Before Method init method *********
Driver instanceis created and  set current local thread
Starting ChromeDriver 2.33.506120 (e3e53437346286c0bc2d2dc9aa4915ba81d9023f) on port 25049
Only local connections are allowed.
Oct 22, 2017 5:03:45 PM org.openqa.selenium.remote.ProtocolHandshake createSession
INFO: Detected dialect: OSS
Set current thread method is called ..
Get curent thread method is called ..
Current thread id :1 thread name is :main
Get curent thread method is called ..
Current thread id :1 thread name is :main
Get curent thread method is called ..
Current thread id :1 thread name is :main
*********Running third  Test Case *********
**** Executing Logine Action *********
URL is sent succesfully..
****** In After Method tear down *********
Removing driver instance from current thread and closing all sesions
driver.quite called 
Current thread removed and clearcurrentDriver() called.. ..
PASSED: LoginFunctionality
        This is first test same as first 
FAILED: LoginFunctionality1
        This is second test same as first 
org.openqa.selenium.NoSuchSessionException: Session ID is null. Using WebDriver after calling quit()?
Build info: version: '3.6.0', revision: '6fbf3ec767', time: '2017-09-27T15:28:36.4Z'
System info: host: 'AFSAR-PC', ip: '192.168.0.100', os.name: 'Windows 7', os.arch: 'amd64', os.version: '6.1', java.version: '1.8.0_131'
Driver info: driver.version: RemoteWebDriver
	at org.openqa.selenium.remote.HttpCommandExecutor.execute(HttpCommandExecutor.java:131)
	at org.openqa.selenium.remote.service.DriverCommandExecutor.execute(DriverCommandExecutor.java:83)
	at org.openqa.selenium.remote.RemoteWebDriver.execute(RemoteWebDriver.java:586)
	at org.openqa.selenium.remote.RemoteWebDriver.findElement(RemoteWebDriver.java:356)
	at org.openqa.selenium.remote.RemoteWebDriver.findElementByLinkText(RemoteWebDriver.java:410)
	at org.openqa.selenium.By$ByLinkText.findElement(By.java:246)
	at org.openqa.selenium.remote.RemoteWebDriver.findElement(RemoteWebDriver.java:348)
	at org.openqa.selenium.support.pagefactory.DefaultElementLocator.findElement(DefaultElementLocator.java:69)
	at org.openqa.selenium.support.pagefactory.internal.LocatingElementHandler.invoke(LocatingElementHandler.java:38)
	at com.sun.proxy.$Proxy9.click(Unknown Source)
	at com.afsar.framework.pageobjects.MercuryToursHomePage.clickRegister(MercuryToursHomePage.java:58)
	at com.afsar.framework.actions.MercuryHomePage_Action.Login_Action(MercuryHomePage_Action.java:13)
	at com.afsar.framework.tests.LoginTest.LoginFunctionality1(LoginTest.java:56)
	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:498)
	at org.testng.internal.MethodInvocationHelper.invokeMethod(MethodInvocationHelper.java:80)
	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:1198)
	at org.testng.TestNG.runSuitesLocally(TestNG.java:1123)
	at org.testng.TestNG.run(TestNG.java:1031)
	at org.testng.remote.AbstractRemoteTestNG.run(AbstractRemoteTestNG.java:132)
	at org.testng.remote.RemoteTestNG.initAndRun(RemoteTestNG.java:230)
	at org.testng.remote.RemoteTestNG.main(RemoteTestNG.java:76)

FAILED: LoginFunctionality2
        This is third test same as first 
org.openqa.selenium.NoSuchSessionException: Session ID is null. Using WebDriver after calling quit()?
Build info: version: '3.6.0', revision: '6fbf3ec767', time: '2017-09-27T15:28:36.4Z'
System info: host: 'AFSAR-PC', ip: '192.168.0.100', os.name: 'Windows 7', os.arch: 'amd64', os.version: '6.1', java.version: '1.8.0_131'
Driver info: driver.version: RemoteWebDriver
	at org.openqa.selenium.remote.HttpCommandExecutor.execute(HttpCommandExecutor.java:131)
	at org.openqa.selenium.remote.service.DriverCommandExecutor.execute(DriverCommandExecutor.java:83)
	at org.openqa.selenium.remote.RemoteWebDriver.execute(RemoteWebDriver.java:586)
	at org.openqa.selenium.remote.RemoteWebDriver.findElement(RemoteWebDriver.java:356)
	at org.openqa.selenium.remote.RemoteWebDriver.findElementByLinkText(RemoteWebDriver.java:410)
	at org.openqa.selenium.By$ByLinkText.findElement(By.java:246)
	at org.openqa.selenium.remote.RemoteWebDriver.findElement(RemoteWebDriver.java:348)
	at org.openqa.selenium.support.pagefactory.DefaultElementLocator.findElement(DefaultElementLocator.java:69)
	at org.openqa.selenium.support.pagefactory.internal.LocatingElementHandler.invoke(LocatingElementHandler.java:38)
	at com.sun.proxy.$Proxy9.click(Unknown Source)
	at com.afsar.framework.pageobjects.MercuryToursHomePage.clickRegister(MercuryToursHomePage.java:58)
	at com.afsar.framework.actions.MercuryHomePage_Action.Login_Action(MercuryHomePage_Action.java:13)
	at com.afsar.framework.tests.LoginTest.LoginFunctionality2(LoginTest.java:67)
	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:498)
	at org.testng.internal.MethodInvocationHelper.invokeMethod(MethodInvocationHelper.java:80)
	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:1198)
	at org.testng.TestNG.runSuitesLocally(TestNG.java:1123)
	at org.testng.TestNG.run(TestNG.java:1031)
	at org.testng.remote.AbstractRemoteTestNG.run(AbstractRemoteTestNG.java:132)
	at org.testng.remote.RemoteTestNG.initAndRun(RemoteTestNG.java:230)
	at org.testng.remote.RemoteTestNG.main(RemoteTestNG.java:76)


===============================================
    Default test
    Tests run: 3, Failures: 2, Skips: 0
===============================================


===============================================
Default suite
Total tests run: 3, Failures: 2, Skips: 0
===============================================

[TestNG] Time taken by org.testng.reporters.XMLReporter@49e4cb85: 407 ms
[TestNG] Time taken by org.testng.reporters.EmailableReporter@5594a1b5: 75 ms
[TestNG] Time taken by org.testng.reporters.JUnitReportReporter@6e8dacdf: 19 ms
[TestNG] Time taken by org.testng.reporters.SuiteHTMLReporter@1134affc: 373 ms
[TestNG] Time taken by [FailedReporter passed=0 failed=0 skipped=0]: 27 ms
[TestNG] Time taken by org.testng.reporters.jq.Main@2f7c7260: 118 ms

Login Test :

public class LoginTest{

	private  WebDriver driver;
	@BeforeMethod
	@Parameters("BROWSER")
	public void init(@Optional("Chrome")String BROWSER) throws Exception{
		System.out.println("****** In Before Method init method *********");
		System.out.println("Driver instanceis created and  set current local thread");
		//Opening desired Browser driver instance
		driver=DriverFactory.OpenBrowser(BROWSER);
		//Setting Current driver with threadLocal
		Driver.setCurrentDriver(driver);
		Driver.getCurrentDriver().manage().window().maximize();
		Driver.getCurrentDriver().manage().timeouts().implicitlyWait(20, TimeUnit.SECONDS);
		//This is Baseclass constructor (Initializaton)
		new BaseClass(Driver.getCurrentDriver());
	}
	
	@Test(description="This is first test same as first ")
	public void LoginFunctionality() throws Exception{
		
		System.out.println("*********Running first Test Case *********");
		MercuryHomePage_Action.Login_Action();
		MercuryHomePage_Action.Register_Action();
		
		System.out.println("PASSED : First test case : Login Successful..");
		
	}
	
	@Test(description="This is second test same as first ")
	public void LoginFunctionality1() throws Exception{
		
		System.out.println("*********Running second Test Case *********");
		MercuryHomePage_Action.Login_Action();
		MercuryHomePage_Action.Register_Action();
		
		System.out.println("PASSED : second test case : Login Successful..");
		
	}
	
	@Test(description="This is third test same as first ")
	public void LoginFunctionality2() throws Exception{
		
		System.out.println("*********Running third  Test Case *********");
		MercuryHomePage_Action.Login_Action();
		MercuryHomePage_Action.Register_Action();
		
		System.out.println("PASSED : third test case : Login Successful..");
	}
	
	@AfterMethod
	public void teardown(){
		
		System.out.println("****** In After Method tear down *********");
		System.out.println("Removing driver instance from current thread and closing all sesions");
		//Driver.getCurrentDriver().quit();
		Driver.QuitDriver();
	}
	
	@AfterTest
	public void aftertest(){
		Driver.clearCurrentDriver();
	}
}

Driver Factory Class:
public class DriverFactory {

	//private static WebDriver driver;

	//@Parameters("BROWSER")
	public static WebDriver OpenBrowser(String BROWSER) throws Exception{
		 WebDriver driver=null;
		try{
			if(BROWSER.equals("Mozilla")){
				driver = new FirefoxDriver();
				Log.info("New driver instantiated");
				driver.manage().timeouts().implicitlyWait(20, TimeUnit.SECONDS);
				Log.info("Implicit wait applied on the driver for 10 seconds");
				//driver.get(Constant.URL);
				Log.info("Web application launched successfully");
			}else if(BROWSER.equalsIgnoreCase("Chrome")){
				System.setProperty("webdriver.chrome.driver", "C:\\Users\\Afsar\\git\\HybridFramework_POM\\HybridFramework\\Drivers\\chromedriver.exe");
				driver = new ChromeDriver();
				Log.info("New driver instantiated");
				driver.manage().timeouts().implicitlyWait(20, TimeUnit.SECONDS);
				Log.info("Implicit wait applied on the driver for 10 seconds");
				//driver.get(Constant.URL);
				Log.info("Web application launched successfully");
			}
		}catch (Exception e){
			Log.error("Class Utils | Method OpenBrowser | Exception desc : "+e.getMessage());
		}
		return driver;
	}
  
  

Driver class:

private static  ThreadLocal<WebDriver> CURRENT_DRIVER = new ThreadLocal<>();

	public static WebDriver getCurrentDriver() {
		System.out.println("Get curent thread method is called ..");	
		Long callingThreadID = new Long(Thread.currentThread().getId());
		System.out.println("Current thread id :"+callingThreadID +" thread name is :"+Thread.currentThread().getName());
		return CURRENT_DRIVER.get();
	}

	public static void setCurrentDriver(WebDriver driver) {
		System.out.println("Set current thread method is called ..");
		CURRENT_DRIVER.set(driver);
	}

	public static void clearCurrentDriver() {
		
		System.out.println("Current thread removed and clearcurrentDriver() called.. ..");
		if (CURRENT_DRIVER.get() != null) {
			CURRENT_DRIVER.get().quit();
			CURRENT_DRIVER.remove();
        }
		
		CURRENT_DRIVER.remove();
	}
	
	public static void QuitDriver() {
		
		System.out.println("driver.quite called ");
		if (CURRENT_DRIVER.get() != null) {
			CURRENT_DRIVER.get().quit();
			//CURRENT_DRIVER.remove();
        }
		
		//CURRENT_DRIVER.remove();
	}

*请在这种情况下帮助我，您可以在 GitHub 存储库中找到该项目: https://github.com/afsarali273/HybridFramework_POM *

Answer 1

问题是，在运行第一个测试时会调用 driver.quit() ，因为在 After 方法注释中， driver.quit() 在第一个测试用例之后被调用。这样，第二个和第三个测试用例的驱动程序为空。使用下面的代码。它会工作得很好:)

@AfterMethod
public void teardown(){         
    System.out.println("****** In After Method tear down *********");
    System.out.println("Removing driver instance from current thread and closing all sesions");
    //Driver.getCurrentDriver().quit();         
}

@AfterTest
    public void aftertest(){
    Driver.QuitDriver();
}