报错信息如下：
Exception in thread "main" org.openqa.selenium.remote.UnreachableBrowserException: Could not start a new session. Possible causes are invalid address of the remote server or browser start-up failure.
Build info: version: '2.31.0', revision: '1bd294d', time: '2013-02-27 20:53:56'
System info: os.name: 'Windows XP', os.arch: 'x86', os.version: '5.1', java.version: '1.6.0_23'
Driver info: driver.version: InternetExplorerDriver
at org.openqa.selenium.remote.RemoteWebDriver.execute(RemoteWebDriver.java:548)
at org.openqa.selenium.remote.RemoteWebDriver.startSession(RemoteWebDriver.java:216)
at org.openqa.selenium.remote.RemoteWebDriver.startSession(RemoteWebDriver.java:201)
at org.openqa.selenium.ie.InternetExplorerDriver.setup(InternetExplorerDriver.java:105)
at org.openqa.selenium.ie.InternetExplorerDriver.<init>(InternetExplorerDriver.java:51)
at com.example.tests.test.main(test.java:27)
Caused by: org.openqa.selenium.WebDriverException: Timed out waiting for driver server to start.
Build info: version: '2.31.0', revision: '1bd294d', time: '2013-02-27 20:53:56'
System info: os.name: 'Windows XP', os.arch: 'x86', os.version: '5.1', java.version: '1.6.0_23'
Driver info: driver.version: InternetExplorerDriver
at org.openqa.selenium.remote.service.DriverService.start(DriverService.java:165)
at org.openqa.selenium.remote.service.DriverCommandExecutor.execute(DriverCommandExecutor.java:62)
at org.openqa.selenium.remote.RemoteWebDriver.execute(RemoteWebDriver.java:527)
... 5 more
Caused by: org.openqa.selenium.net.UrlChecker$TimeoutException: Timed out waiting for [http://localhost:35700/status] to be available after 20553 ms
at org.openqa.selenium.net.UrlChecker.waitUntilAvailable(UrlChecker.java:104)
at org.openqa.selenium.remote.service.DriverService.start(DriverService.java:163)
... 7 more
Caused by: com.google.common.util.concurrent.UncheckedTimeoutException: java.util.concurrent.TimeoutException
at com.google.common.util.concurrent.SimpleTimeLimiter.callWithTimeout(SimpleTimeLimiter.java:143)
at org.openqa.selenium.net.UrlChecker.waitUntilAvailable(UrlChecker.java:79)
... 8 more
Caused by: java.util.concurrent.TimeoutException
at java.util.concurrent.FutureTask$Sync.innerGet(Unknown Source)
at java.util.concurrent.FutureTask.get(Unknown Source)
at com.google.common.util.concurrent.SimpleTimeLimiter.callWithTimeout(SimpleTimeLimiter.java:130)
... 9 more
解决：
You will need InternetExplorer driver executable on your system. So download it from the hinted source (http://code.google.com/p/selenium/downloads/list) unpack it and place somewhere you can find it. In my example, I will assume you will place it to C:Seleniumiexploredriver.exe
Then you have to set it up in the system. Here is the Java code pasted from my Selenium project:
File file = new File("C:/Selenium/iexploredriver.exe");
System.setProperty("webdriver.ie.driver", file.getAbsolutePath());
WebDriver driver = new InternetExplorerDriver();