Windows7 localhost上的Selenium Remote Webdriver抛出空指针异常

Question

多年来我一直在成功地使用RC。我已经决定切换到远程网络驱动程序，以获得所有这些新的好处。首先，我想尝试一个基本的场景。1. 打开Google.com2. 在搜索框中输入"Selenium"

我用以下命令启动独立服务器

java -jar selenium-server-standalone-2.31.0.jar -port 4450

然后执行python测试脚本，其中包含以下行:

from selenium import webdriver
from selenium.common.exceptions import NoSuchElementException
import time
caps = webdriver.DesiredCapabilities.FIREFOX
driver = webdriver.Remote(desired_capabilities=caps,command_executor='http://localhost:4450/wd/hub')
driver.get("http://www.google.com")
time.sleep(5)
driver.find_element_by_id("gbqfb").send_keys("selenium")
driver.quit()

我可以看到google.com打开了，但是在搜索框中没有输入"selenium"。在独立服务器日志中，我得到下面的异常:

配置:Windows 7 professional -32位。17.

我想知道我在这里错过了什么?任何帮助都将不胜感激。谢谢!

C:UsersenginDownloads>java -jar selenium-server-standalone-2.31.0.jar -port 4
450
Nis 04, 2013 11:24:35 AM org.openqa.grid.selenium.GridLauncher main
INFO: Launching a standalone server
11:24:36.180 INFO - Java: Oracle Corporation 23.7-b01
11:24:36.180 INFO - OS: Windows 7 6.1 x86
11:24:36.195 INFO - v2.31.0, with Core v2.31.0. Built from revision 1bd294d
11:24:36.351 INFO - RemoteWebDriver instances should connect to: http://127.0.0.
1:4450/wd/hub
11:24:36.367 INFO - Version Jetty/5.1.x
11:24:36.367 INFO - Started HttpContext[/selenium-server/driver,/selenium-server
/driver]
11:24:36.367 INFO - Started HttpContext[/selenium-server,/selenium-server]
11:24:36.367 INFO - Started HttpContext[/,/]
11:24:36.398 INFO - Started org.openqa.jetty.jetty.servlet.ServletHandler@b1656f
11:24:36.398 INFO - Started HttpContext[/wd,/wd]
11:24:36.398 INFO - Started SocketListener on 0.0.0.0:4450
11:24:36.398 INFO - Started org.openqa.jetty.jetty.Server@18facfb
11:25:42.012 INFO - Executing: [new session: {platform=ANY, javascriptEnabled=tr
ue, browserName=firefox, version=}] at URL: /session)
11:25:48.987 INFO - Done: /session
11:25:49.003 INFO - Executing: org.openqa.selenium.remote.server.handler.GetSess
ionCapabilities@19e774d at URL: /session/3ff2660f-0a08-420d-b3df-eb5b699e4a6b)
11:25:49.003 INFO - Done: /session/3ff2660f-0a08-420d-b3df-eb5b699e4a6b
11:25:49.018 INFO - Executing: [get: http://www.google.com] at URL: /session/3ff
2660f-0a08-420d-b3df-eb5b699e4a6b/url)
11:25:51.436 INFO - Done: /session/3ff2660f-0a08-420d-b3df-eb5b699e4a6b/url
11:25:56.444 INFO - Executing: [find element: By.id: gbqfb] at URL: /session/3ff
2660f-0a08-420d-b3df-eb5b699e4a6b/element)
11:25:56.537 INFO - Done: /session/3ff2660f-0a08-420d-b3df-eb5b699e4a6b/element
11:25:56.537 INFO - Executing: [send keys: null null, [s, e, l, e, n, i, u, m]]
at URL: /session/3ff2660f-0a08-420d-b3df-eb5b699e4a6b/element/0/value)
11:25:56.537 WARN - Exception thrown
java.lang.NullPointerException
        at org.openqa.selenium.remote.server.handler.SendKeys.call(SendKeys.java
:49)
        at org.openqa.selenium.remote.server.handler.SendKeys.call(SendKeys.java
:1)
        at java.util.concurrent.FutureTask$Sync.innerRun(Unknown Source)
        at java.util.concurrent.FutureTask.run(Unknown Source)
        at org.openqa.selenium.remote.server.DefaultSession$1.run(DefaultSession
.java:169)
        at java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source)
        at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)
        at java.lang.Thread.run(Unknown Source)
    11:25:56.553 WARN - Exception: null

Answer 1

我们找到的一个解决方案是…添加-Duser。在启动服务器时使用Java参数解决了这个问题!!顺便说一下，我的操作系统语言是土耳其语。

Answer 2

我以前有过一个非常类似的问题，我发现这个:

https://github.com/mozilla/geckodriver/issues/659

似乎方法send_keys是坏的。他们应该已经修复了它，这样你就可以拉出最新的版本并自己构建它，或者你可以使用send_keys方法工作的旧版本。