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今天把默认浏览器改成chrome，结果一运行脚本就报错，具体错误信息如下。
FAILED CONFIGURATION: @BeforeClass beforeClass
org.openqa.selenium.WebDriverException: unknown error: cannot get automation extension
from unknown error: page could not be found: chrome-extension://aapnijgdinlhnhlmodcfapnahmbfebeb/_generated_background_page.html
? (Session info: chrome=59.0.3071.115)
? (Driver info: chromedriver=2.27.440174 (e97a722caafc2d3a8b807ee115bfb307f7d2cfd9),platform=Windows NT 6.1.7601 SP1 x86_64) (WARNING: The server did not provide any stacktrace information)
Command duration or timeout: 10.12 seconds
Build info: version: '2.41.0',revision: '3192d8a6c4449dc285928ba024779344f5423c58',time: '2014-03-27 11:29:39'
System info: host: 'admin2-PC',ip: '10.2.16.2',os.name: 'Windows 7',os.arch: 'amd64',os.version: '6.1',java.version: '1.7.0_17'
Session ID: a2cffef46bdbde6af4e7ec75998d2bd9
Driver info: org.openqa.selenium.chrome.ChromeDriver
Capabilities [{platform=XP,acceptSslCerts=true,javascriptEnabled=true,browserName=chrome,chrome={userDataDir=C:MyTempscoped_dir6928_24278,chromedriverVersion=2.27.440174 (e97a722caafc2d3a8b807ee115bfb307f7d2cfd9)},networkConnectionEnabled=false,unexpectedAlertBehaviour=,rotatable=false,locationContextEnabled=true,mobileEmulationEnabled=false,version=59.0.3071.115,pageLoadStrategy=normal,takesHeapSnapshot=true,databaseEnabled=false,cssSelectorsEnabled=true,handlesAlerts=true,browserConnectionEnabled=false,nativeEvents=true,webStorageEnabled=true,hasTouchScreen=false,applicationCacheEnabled=false,takesScreenshot=true}]
?? ?at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
?? ?at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:57)
?? ?at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)
?? ?at java.lang.reflect.Constructor.newInstance(Constructor.java:525)
?? ?at org.openqa.selenium.remote.ErrorHandler.createThrowable(ErrorHandler.java:193)
?? ?at org.openqa.selenium.remote.ErrorHandler.throwIfResponseFailed(ErrorHandler.java:145)
?? ?at org.openqa.selenium.remote.RemoteWebDriver.execute(RemoteWebDriver.java:595)
?? ?at org.openqa.selenium.remote.RemoteWebDriver$RemoteWebDriverOptions$RemoteWindow.maximize(RemoteWebDriver.java:825)
?? ?at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
?? ?at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
?? ?at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
?? ?at java.lang.reflect.Method.invoke(Method.java:601)
?? ?at org.testng.internal.MethodInvocationHelper.invokeMethod(MethodInvocationHelper.java:108)
?? ?at org.testng.internal.Invoker.invokeConfigurationMethod(Invoker.java:523)
?? ?at org.testng.internal.Invoker.invokeConfigurations(Invoker.java:224)
?? ?at org.testng.internal.Invoker.invokeConfigurations(Invoker.java:146)
?? ?at org.testng.internal.TestMethodWorker.invokeBeforeClassMethods(TestMethodWorker.java:166)
?? ?at org.testng.internal.TestMethodWorker.run(TestMethodWorker.java:105)
?? ?at org.testng.TestRunner.privateRun(TestRunner.java:744)
?? ?at org.testng.TestRunner.run(TestRunner.java:602)
?? ?at org.testng.SuiteRunner.runTest(SuiteRunner.java:380)
?? ?at org.testng.SuiteRunner.runSequentially(SuiteRunner.java:375)
?? ?at org.testng.SuiteRunner.privateRun(SuiteRunner.java:340)
?? ?at org.testng.SuiteRunner.run(SuiteRunner.java:289)
?? ?at org.testng.SuiteRunnerWorker.runSuite(SuiteRunnerWorker.java:52)
?? ?at org.testng.SuiteRunnerWorker.run(SuiteRunnerWorker.java:86)
?? ?at org.testng.TestNG.runSuitesSequentially(TestNG.java:1301)
?? ?at org.testng.TestNG.runSuitesLocally(TestNG.java:1226)
?? ?at org.testng.TestNG.runSuites(TestNG.java:1144)
?? ?at org.testng.TestNG.run(TestNG.java:1115)
?? ?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)
找了很久才发现原来是我的chromedriver.exe版本太旧了，升级到最新版后就好了。在这里有一个小问题， Selenium的版本规则是大版本号+小版本号，所以：
2.1远远早于2.10
2.9比2.10早
各个版本的时间顺序从新到旧是：
2.19>2.10>2.9>2.1
http://selenium-release.storage.googleapis.com/index.html
Chrome Driver:
http://chromedriver.storage.googleapis.com/index.html
PhantomJS Driver:
http://phantomjs.org/download.html
? （编辑：李大同）
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