Selenium 在容器上执行时跳过测试并抛出错误 "SessionNotCreatedException: Could not start a new session"

Question

我正在 selenium 独立 chrome 调试 docker 容器上使用 TestNG 执行 Selenium 测试。

下面是实例化远程网络驱动的Selenium代码：

ChromeOptions co = new ChromeOptions();
WebDriver driver = new RemoteWebDriver(new URL("http://localhost:4445"), co);

下面是启动容器的docker代码：

docker run --name chromecontainer -d -p 4445:4444 -p 5901:5900 --shm-size="2g" selenium/standalone-chrome-debug:latest

它正在跳过测试并抛出以下错误：

FAILED CONFIGURATION: @BeforeMethod bmeth(org.testng.TestRunner@fcdb78, org.testng.xml.XmlTest@769036db, public void testing.TC_005.vabc() throws java.lang.Exception, [], [TestResult name={null} status=CREATED method=TC_005.vabc()[pri:0, instance:testing.TC_005@1e3708] output={null}])
org.openqa.selenium.SessionNotCreatedException: Could not start a new session. Unable to parse remote response: <!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <link rel="stylesheet" type="text/css" href="/assets/displayhelpservlet.css" media="all"/>
  <link href="/assets/favicon.ico" rel="icon" type="image/x-icon" />
  <script src="/assets/jquery-3.1.1.min.js" type="text/javascript"></script>
  <script src="/assets/displayhelpservlet.js" type="text/javascript"></script>
  <script type="text/javascript">
    var json = Object.freeze('{"consoleLink": "\u002fwd\u002fhub","type": "Standalone","class": "org.openqa.grid.web.servlet.DisplayHelpHandler$DisplayHelpServletConfig","version": "3.141.59"}');
  </script>
</head>
<body>

Caused by: org.openqa.selenium.json.JsonException: Unable to parse: <!DOCTYPE html>
Caused by: org.openqa.selenium.json.JsonException: Unable to determine type from: <. Last 1 characters read: <

但如果我在远程 url 中添加 /wd/hub，那么测试运行没问题。

WebDriver driver = new RemoteWebDriver(new URL("http://localhost:4445/wd/hub"), co);

我试图搜索它的原因，但找不到。

如果我们不添加 /wd/hub，谁能解释为什么会抛出错误，因为根据 Selenium 文档 https://github.com/SeleniumHQ/docker-selenium#quick-start，它提到不再需要它？

Answer 1

我刚刚查看了 selenium/standalone-chrome-debug:latest 第 16 层，有以下命令：

RUN /bin/sh -c mkdir -p /opt/selenium /var/run/supervisor /var/log/supervisor   && touch /opt/selenium/config.json   && chmod -R 777 /opt/selenium /var/run/supervisor /var/log/supervisor /etc/passwd   && wget --no-verbose https://selenium-release.storage.googleapis.com/3.141/selenium-server-standalone-3.141.59.jar     -O /opt/selenium/selenium-server-standalone.jar   && chgrp -R 0 /opt/selenium ${HOME} /var/run/supervisor /var/log/supervisor   && chmod -R g=u /opt/selenium ${HOME} /var/run/supervisor /var/log/supervisor # buildkit

看起来引擎盖下有 Grid 3，因此您必须添加 /wd/hub，这在 Grid 4 中变得可选。

Selenium 在容器上执行时跳过测试并抛出错误 "SessionNotCreatedException: Could not start a new session"

Selenium is skipping the test and throwing the error "SessionNotCreatedException: Could not start a new session" while executing on container

selenium-grid

selenium-webdriver

docker