RSelenium UnknownError - 使用谷歌浏览器的java.lang.IllegalStateException [英] RSelenium UnknownError - java.lang.IllegalStateException with Google Chrome

问题描述

我根据 RSelenium运行以下脚本基础知识CRAN页面：

library(RSelenium)
startServer(args = c("-port 4455"), log = FALSE, invisible = FALSE)
remDr <- remoteDriver(browserName = "chrome")
remDr$open()

这会产生以下错误：

Exception in thread "main" java.net.BindException: Selenium is already running on port 4444. Or some other service is.
 at org.openqa.selenium.server.SeleniumServer.start(SeleniumServer.java:492)
 at org.openqa.selenium.server.SeleniumServer.boot(SeleniumServer.java:305)
 at org.openqa.selenium.server.SeleniumServer.main(SeleniumServer.java:245)
 at org.openqa.grid.selenium.GridLauncher.main(GridLauncher.java:64)

根据在GitHub上的这个对话，我修改了我的 startServer（）命令，如下所示：

Based on the comments from this conversation on GitHub, I've modified my startServer() command like so:

startServer(args = c("-port 4455"), log = FALSE, invisible = FALSE)

然后我在我的控制台中收到以下错误：

I then receive the following error in my console:

Error:   Summary: UnknownError
 Detail: An unknown server-side error occurred while processing the command.
 class: java.lang.IllegalStateException

弹出的Java提示中出现此错误：

And this error in the Java prompt that pops up:

14:38:55.098 INFO - Launching a standalone Selenium Server
14:38:55:161 INFO - Java: Oracle Corporation 25.40-b25
14:38:55.161 INFO - OS: Windows 7 6.1 amd64
14:38:55.161 INFO - v2.46.0, with Core v2.46.0. Built from revision 87c69e2
14:38:55.209 INFO - Driver class not found: com.opera.core.systems.OperaDriver
14:38:55.209 INFO - Driver provider com.opera.core.systems.OperaDriver is not registered
14:38:55:289 INFO - RemoteWebDriver instances should connect to: http://127.0.0.1:4455/wd/hub
14:38:55:289 INFO - Selenium Server is up and running

我不确定缺少Opera驱动程序是否是实际错误或只是一个警告。无论如何，我想使用Chrome，所以看起来应该没关系。我做错了什么？

I'm not sure if the lack of an Opera driver is an actual error or just a warning. Regardless, I would like to use Chrome, so it seems like it shouldn't matter. What am I doing wrong?

推荐答案

我终于能够通过拼接来自多个不同来源的信息来使RSelenium工作。我认为将所有这些信息放在一个位置会很有帮助，所以这是我使用Chrome浏览器作为浏览器让RSelenium在Windows 7（64位）上运行的过程：

I was finally able to get RSelenium to work by piecing together information from a number of different sources. I think it would be helpful to have all of this information in one location, so here is the process that I went through to get RSelenium to work on Windows 7 (64-bit) with Chrome as the browser:

1. 下载 64位版本的Java 。我无法使用标准下载。


2. 下载 ChromeDriver 。


3. 下载 Selenium Standalone Server 或从R运行 checkForServer（）



4. 创建批处理文件以启动Selenium服务器。我最初尝试使用R脚本中的 startServer（），但它会经常卡住而不是继续脚本中的下一行。这是我创建的批处理文件：

1. Download the 64-bit version of Java. I could not get anything to work with the standard download.
2. Download ChromeDriver.
3. Download the Selenium Standalone Server or run checkForServer() from R.

4. Create a batch file to start the Selenium server. I initially tried to use startServer() from an R script, but it would frequently get stuck and not carry on to the next line in the script. Here is the batch file that I created:

java -jar C:\path\to\selenium-server-standalone.jar -Dwebdriver.chrome.driver=C:\path\to\chromedriver.exe

ChromeDriver可以放在PATH环境变量中，但我决定在ChromeDriver的路径中添加批处理文件（实现相同的目标）。

ChromeDriver can be put in the PATH environmental variable, but I decided to add in the path to ChromeDriver to the batch file (which accomplishes the same goal).

运行R脚本。这是我的最终脚本：

library(RSelenium)
shell.exec(paste0("C:\\path\\to\\yourbatchfile.bat"))
Sys.sleep(5)

remDr <- remoteDriver(browserName = "chrome")
remDr$open(silent = TRUE)
remDr$navigate("http://www.google.com")

Sys.sleep（）调用是必要的，因为我会收到错误如果它在Selenium Server完成启动之前运行，则在 remoteDriver（）调用。

The Sys.sleep() call was necessary because I would get an error in the remoteDriver() call if it ran before the Selenium Server had finished starting.

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