我在ubuntu virtualbox上为python 3运行selenium grid,我设置了一个网格
java -jar selenium-server-standalone-3.4.0.jar -port 4444 -role hub
一切似乎都好我上了终点站
信息 - Selenium Grid集线器已启动并正在运行
我添加一个节点
java -jar selenium-server-standalone-3.4.0.jar -role webdriver -browser "browserName=firefox,version=54,maxinstance=2,platform=LINUX" -hub http://localhost:4444/grid/register -port 5555
一切似乎都好我上了终点站
信息 - 节点已注册到集线器并可供使用
INFO - SessionCleaner使用insideBrowserTimeout 0初始化,clientGoneTimeout 1800000每180000轮询一次
如果我用节点地址http://10.0.2.15:5555/wd/hub运行此代码一切正常
PLATFORM = 'LINUX'
BROWSER = 'firefox'
def setUp(self):
desired_caps = {}
desired_caps['platform'] = self.PLATFORM
desired_caps['browserName'] = self.BROWSER
self.driver = \
webdriver.Remote('http://10.0.2.15:5555/wd/hub', desired_caps)
self.driver.get("https://www.facebook.com/login/")
self.driver.implicitly_wait(30) self.driver.maximize_window()
如果我运行上面的代码与网格地址http://10.0.2.15:4444/wd/hub像它应该是我必须总是得到一个错误:
Error
Traceback (most recent call last):
File "/home/thorbuntu/PycharmProjects/seletests/grid_test.py", line 21, in setUp
webdriver.Remote('http://10.0.2.15:4444/wd/hub', desired_caps)
File "/usr/local/lib/python3.5/dist-packages/selenium/webdriver/remote/webdriver.py", line 98, in __init__
self.start_session(desired_capabilities, browser_profile)
File "/usr/local/lib/python3.5/dist-packages/selenium/webdriver/remote/webdriver.py", line 188, in start_session
response = self.execute(Command.NEW_SESSION, parameters)
File "/usr/local/lib/python3.5/dist-packages/selenium/webdriver/remote/webdriver.py", line 256, in execute
self.error_handler.check_response(response)
File "/usr/local/lib/python3.5/dist-packages/selenium/webdriver/remote/errorhandler.py", line 194, in check_response
raise exception_class(message, screen, stacktrace)
selenium.common.exceptions.WebDriverException: Message: None
Stacktrace:
at java.util.HashMap.putMapEntries (HashMap.java:500)
at java.util.HashMap.putAll (HashMap.java:784)
at org.openqa.selenium.remote.DesiredCapabilities.<init> (DesiredCapabilities.java:55)
at org.openqa.grid.web.servlet.handler.RequestHandler.process (RequestHandler.java:104)
at org.openqa.grid.web.servlet.DriverServlet.process (DriverServlet.java:83)
at org.openqa.grid.web.servlet.DriverServlet.doPost (DriverServlet.java:67)
at javax.servlet.http.HttpServlet.service (HttpServlet.java:707)
at javax.servlet.http.HttpServlet.service (HttpServlet.java:790)
at org.seleniumhq.jetty9.servlet.ServletHolder.handle (ServletHolder.java:841)
at org.seleniumhq.jetty9.servlet.ServletHandler.doHandle (ServletHandler.java:543)
at org.seleniumhq.jetty9.server.handler.ScopedHandler.nextHandle (ScopedHandler.java:188)
at org.seleniumhq.jetty9.server.session.SessionHandler.doHandle (SessionHandler.java:1584)
at org.seleniumhq.jetty9.server.handler.ScopedHandler.nextHandle (ScopedHandler.java:188)
at org.seleniumhq.jetty9.server.handler.ContextHandler.doHandle (ContextHandler.java:1228)
at org.seleniumhq.jetty9.server.handler.ScopedHandler.nextScope (ScopedHandler.java:168)
at org.seleniumhq.jetty9.servlet.ServletHandler.doScope (ServletHandler.java:481)
at org.seleniumhq.jetty9.server.session.SessionHandler.doScope (SessionHandler.java:1553)
at org.seleniumhq.jetty9.server.handler.ScopedHandler.nextScope (ScopedHandler.java:166)
at org.seleniumhq.jetty9.server.handler.ContextHandler.doScope (ContextHandler.java:1130)
at org.seleniumhq.jetty9.server.handler.ScopedHandler.handle (ScopedHandler.java:141)
at org.seleniumhq.jetty9.server.handler.HandlerWrapper.handle (HandlerWrapper.java:132)
at org.seleniumhq.jetty9.server.Server.handle (Server.java:564)
at org.seleniumhq.jetty9.server.HttpChannel.handle (HttpChannel.java:320)
at org.seleniumhq.jetty9.server.HttpConnection.onFillable (HttpConnection.java:251)
at org.seleniumhq.jetty9.io.AbstractConnection$ReadCallback.succeeded (AbstractConnection.java:279)
at org.seleniumhq.jetty9.io.FillInterest.fillable (FillInterest.java:112)
at org.seleniumhq.jetty9.io.ChannelEndPoint$2.run (ChannelEndPoint.java:124)
at org.seleniumhq.jetty9.util.thread.QueuedThreadPool.runJob (QueuedThreadPool.java:672)
at org.seleniumhq.jetty9.util.thread.QueuedThreadPool$2.run (QueuedThreadPool.java:590)
at java.lang.Thread.run (Thread.java:748)
哪里可能是我在virtualbox和selenium python上运行ubuntu的问题
非常感谢
1 回答
你可能实际上遇到了网格方面的一个错误(已经修复但尚未发布)
当你的python客户端代码通过以下行实例化一个新的远程WebDriver时
这将转换为以下形式的JSON有效内容
在网格方面(Selenium Grid v.3.4.0),集线器尝试使用
org.openqa.grid.web.servlet.handler.WebDriverRequest#extractDesiredCapability
中的以下逻辑将此JSON解析为所需的功能:如您所见,此逻辑最终返回所需功能的NULL值,因为:
在JSON Payload中,找到了元素
capabilities
但是在JSON子元素capabilities
内,没有名为desiredCapabilities
的子元素这会导致通过
extractDesiredCapability()
返回NULL映射,并最终触发NullPointerException
.我知道现在已经在Selenium Grid代码库中修复了这个问题,作为this commit的一部分,它在实例化HashMap之前添加了Null Check防护,并且this commit确保Grid基本上检查是否:
JSON有效负载有一个名为
capabilities
的密钥在
capabilities
键中有一个名为desiredCapabilities
的子项,它在尝试将这些功能提取为 Map 之前,如果不是只查找键desiredCapabilities
.另一方面,如果您将测试代码直接指向节点,则它可以正常工作,因为当测试路由到节点时,不会涉及上述解析 .
所以现在我建议你回滚使用Selenium 2.53.1 of Grid,直到下一个版本(包含上面提到的两个提交)发布 .
希望有所帮助 .