我的webdriver代碼在FF上運行良好，但在IE11上出現錯誤

Question

我用下面給出的JAVA編寫的webdrive代碼在FF上工作正常，但是在使用IE11運行時出現相同的代碼時出錯。你能幫忙找出原因嗎？我的IE打開，它也加載網站（我沒有打開保護模式的IE11順利運行），但之後，它不能識別的元素。您可以註釋IE驅動程序的行和FF驅動程序的取消註釋行，代碼將執行沒有任何問題。

我的代碼：

WebDriver myD = null; 
    File file = new File("C:/Users/pritik/Desktop/WebDriver/Drivers/IEDriverServer_x64_2.43.0/IEDriverServer.exe"); 
    System.setProperty("webdriver.ie.driver", file.getAbsolutePath()); 
    myD = new InternetExplorerDriver(); 

// myD= new FirefoxDriver(); 

    myD.navigate().to("http://lp2domapptst.lpdomain.com:10000/ucl/login/jsp/universal_login.jsp"); 
    String a; 
    a= KW.waitTime("3000"); 
    WebElement we = myD.findElement(By.xpath("//input[@name='j_username']")); 
    we.sendKeys("test"); 

    we = myD.findElement(By.xpath("//input[@name='j_password']")); 
    we.sendKeys("test"); 

    myD.findElement(By.xpath("//button[@name='btnEnter']")).click(); 

我得到以下異常：

org.openqa.selenium.InvalidSelectorException: The xpath expression '//input[@name='j_username']' cannot be evaluated or does notresult in a WebElement (WARNING: The server did not provide any stacktrace information) 
Command duration or timeout: 94 milliseconds 
For documentation on this error, please visit: http://seleniumhq.org/exceptions/invalid_selector_exception.html 
Build info: version: '2.43.1', revision: '5163bce', time: '2014-09-10 16:27:58' 
System info: host: 'cod8PKOTHAVALE', ip: '10.30.75.6', os.name: 'Windows 8', 

os.arch: 'amd64', os.version: '6.2', java.version: '1.7.0_40' 
Session ID: d56eacc2-4739-4017-bb00-c06b01930d91 
Driver info: org.openqa.selenium.ie.InternetExplorerDriver 
Capabilities [{platform=WINDOWS, javascriptEnabled=true, elementScrollBehavior=0, ignoreZoomSetting=false, enablePersistentHover=true, ie.ensureCleanSession=false, browserName=internet explorer, enableElementCacheCleanup=true, unexpectedAlertBehaviour=dismiss, version=11, ie.usePerProcessProxy=false, cssSelectorsEnabled=true, ignoreProtectedModeSettings=false, requireWindowFocus=false, handlesAlerts=true, initialBrowserUrl=http://localhost:25808/, ie.forceCreateProcessApi=false, nativeEvents=true, browserAttachTimeout=0, ie.browserCommandLineSwitches=, takesScreenshot=true}] 
    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:204) 
    at org.openqa.selenium.remote.ErrorHandler.throwIfResponseFailed(ErrorHandler.java:156) 
    at org.openqa.selenium.remote.RemoteWebDriver.execute(RemoteWebDriver.java:599) 
    at org.openqa.selenium.remote.RemoteWebDriver.findElement(RemoteWebDriver.java:352) 
    at org.openqa.selenium.remote.RemoteWebDriver.findElementByXPath(RemoteWebDriver.java:449) 
    at org.openqa.selenium.By$ByXPath.findElement(By.java:357) 
    at org.openqa.selenium.remote.RemoteWebDriver.findElement(RemoteWebDriver.java:344) 
    at testOrder.myTest(testOrder.java:46) 
    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:45) 
    at org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:15) 
    at org.junit.runners.model.FrameworkMethod.invokeExplosively(FrameworkMethod.java:42) 
    at org.junit.internal.runners.statements.InvokeMethod.evaluate(InvokeMethod.java:20) 
    at org.junit.internal.runners.statements.RunBefores.evaluate(RunBefores.java:28) 
    at org.junit.internal.runners.statements.RunAfters.evaluate(RunAfters.java:30) 
    at org.junit.runners.ParentRunner.runLeaf(ParentRunner.java:263) 
    at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:68) 
    at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:47) 
    at org.junit.runners.ParentRunner$3.run(ParentRunner.java:231) 
    at org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:60) 
    at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:229) 
    at org.junit.runners.ParentRunner.access$000(ParentRunner.java:50) 
    at org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:222) 
    at org.junit.runners.ParentRunner.run(ParentRunner.java:300) 
    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) 

Answer 1

找到input的名字，而不是：

WebElement we = myD.findElement(By.name("j_username")); 

Answer 2

試試這個：

myD.navigate().to("http://lp2domapptst.lpdomain.com:10000/ucl/login/jsp/universal_login.jsp"); 
String a; 
a= KW.waitTime("3000"); 
WebElement we = myD.findElement(By.name("j_username")); 

Int timeoutInSeconds = 10; 
WebDriverWait wait = new WebDriverWait(mD, timeoutInSeconds); 
wait.until(ExpectedConditions.visibilityOfElementLocated(By.name("j_username")); 

we.sendKeys("test"); 

我只能假設IE瀏覽器無法看到元素，因爲DOM可能已被操作。