Selenium server 启动失败

配置Selenium server的步骤

1. 配置JAVA环境 ，前面已经有所介绍，此处略。
2. 下载运行 selenium server ，在网上中找到 selenium-server-standalone-2.41.0.jar 进行下载。下载完成可以放到任意位置(D:)，直接在命令提示符下启动 Selenium Server：
   D:> java -jar selenium-server-standalone-2.41.3.jar
   
3. 运行test.py 脚本

 from selenium.webdriver import Remote
import time
from selenium.webdriver.common.desired_capabilities import DesiredCapabilities
driver = Remote(command_executor='http://127.0.0.1:4444/wd/hub',
desired_capabilities={'platform': 'ANY',
                      'browserName':'firefox',
                      'version': '',
                      'javascriptEnabled': True})
driver.get('http://www.baidu.com')
title=driver.title
print (title)
time.sleep(3)
driver.quit()
   

4.F5 运行，得到，如下报错:
Traceback (most recent call last):
File “C:\Python34\remote.py”, line 8, in
‘javascriptEnabled’: True})
File “C:\Python34\lib\site-packages\selenium\webdriver\remote\webdriver.py”, line 91, in init
self.start_session(desired_capabilities, browser_profile)
File “C:\Python34\lib\site-packages\selenium\webdriver\remote\webdriver.py”, line 173, in start_session
‘desiredCapabilities’: desired_capabilities,
File “C:\Python34\lib\site-packages\selenium\webdriver\remote\webdriver.py”, line 233, in execute
self.error_handler.check_response(response)
File “C:\Python34\lib\site-packages\selenium\webdriver\remote\errorhandler.py”, line 194, in check_response
raise exception_class(message, screen, stacktrace)
selenium.common.exceptions.WebDriverException: Message: Unable to connect to host 127.0.0.1 on port 7056 after 45000 ms. Firefox console output:
source://gre/modules/Task.jsm:276:3
createAsyncFunction/asyncFunction@resource://gre/modules/Task.jsm:250:14
loadManifestFromFile@resource://gre/modules/addons/XPIProvider.jsm:1461:12
AddonInstaller.InstallerService._shouldInstall/<@resource://addoninstaller/installerService.js:341:49
safeCall@resource://gre/modules/AddonManager.jsm:179:5
makeSafe/<@resource://gre/modules/AddonManager.jsm:195:25
Handler.prototype.process@resource://gre/modules/Promise.jsm -> resource://gre/modules/Promise-backend.js:933:23
this.PromiseWalker.walkerLoop@resource://gre/modules/Promise.jsm -> resource://gre/modules/Promise-backend.js:812:7
this.PromiseWalker.scheduleWalkerLoop/<@resource://gre/modules/Promise.jsm -> resource://gre/modules/Promise-backend.js:746:11

---

---

A coding exception was thrown and uncaught in a Task.

Full message: TypeError: aAddon._installLocation is undefined
Full stack: shouldVerifySignedState@resource://gre/modules/addons/XPIProvider.jsm:1662:1
verifyZipSignedState@resource://gre/modules/addons/XPIProvider.jsm:1693:8
loadManifestFromZipReader<@resource://gre/modules/addons/XPIProvider.jsm:1426:29
TaskImpl_run@resource://gre/modules/Task.jsm:315:40
TaskImpl@resource://gre/modules/Task.jsm:276:3
createAsyncFunction/asyncFunction@resource://gre/modules/Task.jsm:250:14
loadManifestFromZipFile<@resource://gre/modules/addons/XPIProvider.jsm:1451:26
TaskImpl_run@resource://gre/modules/Task.jsm:315:40
TaskImpl@resource://gre/modules/Task.jsm:276:3
createAsyncFunction/asyncFunction@resource://gre/modules/Task.jsm:250:14
loadManifestFromFile@resource://gre/modules/addons/XPIProvider.jsm:1461:12
AddonInstaller.InstallerService._shouldInstall/<@resource://addoninstaller/installerService.js:341:49
safeCall@resource://gre/modules/AddonManager.jsm:179:5
makeSafe/<@resource://gre/modules/AddonManager.jsm:195:25
Handler.prototype.process@resource://gre/modules/Promise.jsm -> resource://gre/modules/Promise-backend.js:933:23
this.PromiseWalker.walkerLoop@resource://gre/modules/Promise.jsm -> resource://gre/modules/Promise-backend.js:812:7
this.PromiseWalker.scheduleWalkerLoop/<@resource://gre/modules/Promise.jsm -> resource://gre/modules/Promise-backend.js:746:11

---

---

A coding exception was thrown and uncaught in a Task.

Full message: TypeError: aAddon._installLocation is undefined
Full stack: shouldVerifySignedState@resource://gre/modules/addons/XPIProvider.jsm:1662:1
verifyZipSignedState@resource://gre/modules/addons/XPIProvider.jsm:1693:8
loadManifestFromZipReader<@resource://gre/modules/addons/XPIProvider.jsm:1426:29
TaskImpl_run@resource://gre/modules/Task.jsm:315:40
TaskImpl@resource://gre/modules/Task.jsm:276:3
createAsyncFunction/asyncFunction@resource://gre/modules/Task.jsm:250:14
loadManifestFromZipFile<@resource://gre/modules/addons/XPIProvider.jsm:1451:26
TaskImpl_run@resource://gre/modules/Task.jsm:315:40
TaskImpl@resource://gre/modules/Task.jsm:276:3
createAsyncFunction/asyncFunction@resource://gre/modules/Task.jsm:250:14
loadManifestFromFile@resource://gre/modules/addons/XPIProvider.jsm:1461:12
AddonInstaller.InstallerService._shouldInstall/<@resource://addoninstaller/installerService.js:341:49
safeCall@resource://gre/modules/AddonManager.jsm:179:5
makeSafe/<@resource://gre/modules/AddonManager.jsm:195:25
Handler.prototype.process@resource://gre/modules/Promise.jsm -> resource://gre/modules/Promise-backend.js:933:23
this.PromiseWalker.walkerLoop@resource://gre/modules/Promise.jsm -> resource://gre/modules/Promise-backend.js:812:7
this.PromiseWalker.scheduleWalkerLoop/<@resource://gre/modules/Promise.jsm -> resource://gre/modules/Promise-backend.js:746:11

---

JavaScript warning: https://normandy.cdn.mozilla.net/static/js/bundles/selfrepair-7575f6d27445b45bcffb.js, line 9825: mutating the [[Prototype]] of an object will cause your code to run very slowly; instead create the object with the correct initial [[Prototype]] value using Object.create

Stacktrace:
at org.openqa.selenium.firefox.internal.NewProfileExtensionConnection.start (NewProfileExtensionConnection.java:118)
at org.openqa.selenium.firefox.FirefoxDriver.startClient (FirefoxDriver.java:246)
at org.openqa.selenium.remote.RemoteWebDriver. (RemoteWebDriver.java:114)
at org.openqa.selenium.firefox.FirefoxDriver. (FirefoxDriver.java:193)
at org.openqa.selenium.firefox.FirefoxDriver. (FirefoxDriver.java:186)
at org.openqa.selenium.firefox.FirefoxDriver. (FirefoxDriver.java:104)
at sun.reflect.NativeConstructorAccessorImpl.newInstance0 (None:-2)
at sun.reflect.NativeConstructorAccessorImpl.newInstance (None:-1)
at sun.reflect.DelegatingConstructorAccessorImpl.newInstance (None:-1)
at java.lang.reflect.Constructor.newInstance (None:-1)
at org.openqa.selenium.remote.server.DefaultDriverFactory.callConstructor (DefaultDriverFactory.java:62)
at org.openqa.selenium.remote.server.DefaultDriverFactory.newInstance (DefaultDriverFactory.java:56)
at org.openqa.selenium.remote.server.DefaultSession$BrowserCreator.call(DefaultSession.java:216)atorg.openqa.selenium.remote.server.DefaultSession$BrowserCreator.call (DefaultSession.java:1)
at java.util.concurrent.FutureTask.run (None:-1)
at org.openqa.selenium.remote.server.DefaultSession$1.run(DefaultSession.java:170)atjava.util.concurrent.ThreadPoolExecutor.runWorker(None:-1)atjava.util.concurrent.ThreadPoolExecutor$Worker.run (None:-1)
at java.lang.Thread.run (None:-1)

分析原因：
因为Selenium  server版本与Firefox版本不兼容，升级Selenium 以及使用最新的selenium server版本。
解决方法：
1) 升级Selenium  pip install -U selenium
2) 下载更高版本的selenium server版本 selenium-server-standalone-2.51.3.jar 
   ![这里写图片描述](https://img-blog.csdn.net/20160604100824744)
3) 再次运行，成功！

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