Selenium Java遇unknown error: unexpected command response错误求助

问题描述 #

在Eclipse中使用Selenium时频繁报错，此前因加载问题将Chrome降级至102版本，现在出现无法理解的新错误，以下是控制台报错信息及测试脚本：

控制台报错信息 #

Exception in thread "main" org.openqa.selenium.WebDriverException: unknown error: unexpected command response
  (Session info: chrome=103.0.5060.114)
Build info: version: '4.3.0', revision: 'a4995e2c09*'
System info: host: 'AWAIS-PC', ip: '192.168.1.62', os.name: 'Windows 10', os.arch: 'amd64', os.version: '10.0', java.version: '18.0.1'
Driver info: org.openqa.selenium.chrome.ChromeDriver
Command: [b494462d4f7752feaa9aeeb67f469204, findElement {using=id, value=wzrk-cancel}]
Capabilities {acceptInsecureCerts: false, browserName: chrome, browserVersion: 103.0.5060.114, chrome: {chromedriverVersion: 102.0.5005.61 (0e59bcc00cc4..., userDataDir: C:\Users\WRP\AppData\Local\...}, goog:chromeOptions: {debuggerAddress: localhost:54170}, networkConnectionEnabled: false, pageLoadStrategy: normal, platformName: WINDOWS, proxy: Proxy(), se:cdp: ws://localhost:54170/devtoo..., se:cdpVersion: 103.0.5060.114, setWindowRect: true, strictFileInteractability: false, timeouts: {implicit: 0, pageLoad: 300000, script: 30000}, unhandledPromptBehavior: dismiss and notify, webauthn:extension:credBlob: true, webauthn:extension:largeBlob: true, webauthn:virtualAuthenticators: true}
Session ID: b494462d4f7752feaa9aeeb67f469204
    at java.base/jdk.internal.reflect.DirectConstructorHandleAccessor.newInstance(DirectConstructorHandleAccessor.java:67)
    at java.base/java.lang.reflect.Constructor.newInstanceWithCaller(Constructor.java:499)
    at java.base/java.lang.reflect.Constructor.newInstance(Constructor.java:483)
    at org.openqa.selenium.remote.codec.w3c.W3CHttpResponseCodec.createException(W3CHttpResponseCodec.java:200)
    at org.openqa.selenium.remote.codec.w3c.W3CHttpResponseCodec.decode(W3CHttpResponseCodec.java:133)
    at org.openqa.selenium.remote.codec.w3c.W3CHttpResponseCodec.decode(W3CHttpResponseCodec.java:53)
    at org.openqa.selenium.remote.HttpCommandExecutor.execute(HttpCommandExecutor.java:184)
    at org.openqa.selenium.remote.service.DriverCommandExecutor.invokeExecute(DriverCommandExecutor.java:167)
    at org.openqa.selenium.remote.service.DriverCommandExecutor.execute(DriverCommandExecutor.java:142)
    at org.openqa.selenium.remote.RemoteWebDriver.execute(RemoteWebDriver.java:569)
    at org.openqa.selenium.remote.ElementLocation$ElementFinder$2.findElement(ElementLocation.java:162)
    at org.openqa.selenium.remote.ElementLocation.findElement(ElementLocation.java:60)
    at org.openqa.selenium.remote.RemoteWebDriver.findElement(RemoteWebDriver.java:387)
    at org.openqa.selenium.remote.RemoteWebDriver.findElement(RemoteWebDriver.java:379)
    at org.openqa.selenium.support.ui.ExpectedConditions$7.apply(ExpectedConditions.java:197)
    at org.openqa.selenium.support.ui.ExpectedConditions$7.apply(ExpectedConditions.java:193)
    at org.openqa.selenium.support.ui.FluentWait.until(FluentWait.java:208)
    at First_Test.Practice_First.main(Practice_First.java:52)

测试脚本 #

WebDriverManager.chromedriver().driverVersion("102.0.5005.61").setup();
WebDriver driver = new ChromeDriver();
WebDriverWait waits=new WebDriverWait (driver, Duration.ofSeconds(13));
//driver.manage().timeouts().implicitlyWait(1, TimeUnit.SECONDS);
driver.get("https://www.ounass.ae/");
//Thread.sleep(3000);
driver.manage().window().maximize();
//Thread.sleep(3000);
//  String originalWindow=  driver.getWindowHandle();
// Thread.sleep(5000);
waits.until(ExpectedConditions.visibilityOfElementLocated(By.id("wzrk-cancel")));
driver.findElement(By.id("wzrk-cancel")).click();
// driver.findElement(By.xpath("//button[@id='wzrk-cancel']")).click();
waits.until(ExpectedConditions.visibilityOfElementLocated(By.cssSelector("a[href*='/men']")));
driver.findElement(By.cssSelector("a[href*='/men']")).click();
JavascriptExecutor Js1 = (JavascriptExecutor) driver;
Js1.executeScript("window.scrollBy(0,2500)"); 

原因分析 #

从报错信息的Session info: chrome=103.0.5060.114和chromedriverVersion: 102.0.5005.61可以明确：Chrome浏览器已自动更新至103版本，但你指定使用的ChromeDriver还是102版本，两者版本不匹配，导致Selenium与浏览器之间无法正常通信，触发unknown error: unexpected command response异常。

解决方案 #

方案1：升级ChromeDriver至与当前Chrome匹配的版本 #

查看当前Chrome浏览器版本（103.0.5060.114），下载对应版本的ChromeDriver（如103.0.5060.134），修改脚本中指定的版本号：

WebDriverManager.chromedriver().driverVersion("103.0.5060.134").setup();

方案2：锁定Chrome浏览器版本为102 #

1. 关闭Chrome自动更新：打开Chrome→设置→关于Chrome，关闭自动更新功能；
2. 若Chrome已自动更新到103，卸载当前版本，重新下载安装Chrome 102版本；
3. 保持ChromeDriver版本为102.0.5005.61，脚本无需修改。

方案3：让WebDriverManager自动匹配版本 #

去掉手动指定driverVersion的代码，WebDriverManager会自动检测当前Chrome版本并下载对应的ChromeDriver，简化脚本：

WebDriverManager.chromedriver().setup();

额外优化建议 #

• 将等待条件从visibilityOfElementLocated改为elementToBeClickable，确保元素可见且可点击，避免点击失败：

  waits.until(ExpectedConditions.elementToBeClickable(By.id("wzrk-cancel")));
  

• 避免同时使用隐式等待和显式等待，防止等待逻辑冲突（你的脚本已经注释了隐式等待，这点做得很好）。

内容的提问来源于stack exchange，提问作者Zamir Sultan