通过Selenium和Java使用findElement(By.className())的sun.reflect.NativeConstructorAccessorImpl.newInstance0(本机方法) [英] sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method) using findElement(By.className()) through Selenium and Java

问题描述

当我执行以下代码时:

driver.findElement(By.className("qview-product-name")).click();

我收到以下错误

Session ID: d5df6f837164b1738991e8dc09027fe0
*** Element info: {Using=class name, value=qview-product-name}
    at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
    at sun.reflect.NativeConstructorAccessorImpl.newInstance(Unknown Source)
    at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(Unknown Source)
    at java.lang.reflect.Constructor.newInstance(Unknown Source)
    at org.openqa.selenium.remote.http.W3CHttpResponseCodec.createException(W3CHttpResponseCodec.java:187)
    at org.openqa.selenium.remote.http.W3CHttpResponseCodec.decode(W3CHttpResponseCodec.java:122)
    at org.openqa.selenium.remote.http.W3CHttpResponseCodec.decode(W3CHttpResponseCodec.java:49)
    at org.openqa.selenium.remote.HttpCommandExecutor.execute(HttpCommandExecutor.java:158)
    at org.openqa.selenium.remote.service.DriverCommandExecutor.execute(DriverCommandExecutor.java:83)
    at org.openqa.selenium.remote.RemoteWebDriver.execute(RemoteWebDriver.java:552)
    at org.openqa.selenium.remote.RemoteWebDriver.findElement(RemoteWebDriver.java:323)
    at org.openqa.selenium.remote.RemoteWebDriver.findElementByClassName(RemoteWebDriver.java:412)
    at org.openqa.selenium.By$ByClassName.findElement(By.java:389)
    at org.openqa.selenium.remote.RemoteWebDriver.findElement(RemoteWebDriver.java:315)
    at Logins.bcLogin(Logins.java:140)
    at Exception.main(Exception.java:54)

我正在处理的网页肯定包含以下HTML代码，并且我尝试等待适当的时间来执行.

The webpage I am working on definately contains the following HTML code and I have tried waiting an appropriate amount of time to execute.

<dd class="qview-product-name">
    <span class="note">1 x </span>
                    <a href="Link_here"_blank">Title</a>
            </dd>

我以为我可以很好地使用各种方法来定位元素，但这让我很困惑.关于如何进行故障排除的任何想法?谢谢！

I thought I was getting pretty good at locating elements using the various methods, but this has me stumped. Any ideas on how I should go about troubleshooting? Thanks!

推荐答案

您需要注意以下几点:

• By.className("qview-product-name")引用父< dd> 标记，可能不是您想要单击的元素.相反，您的用例必须是单击< a href ="Link_here" _blank> Title</a> 元素.

• 按照最佳做法，在调用 click()时，您需要诱导为 elementToBeClickable()诱导 WebDriverWait >，您可以使用以下任一定位器策略:

• By.className("qview-product-name") refers to the parent <dd> tag and perhaps is not the desired element you want to click. Rather your usecase must be to click on the <a href="Link_here"_blank">Title</a> element.

• As per best practices, while invoking click() you need to induce you need to induce WebDriverWait for the elementToBeClickable() and you can use either of the following Locator Strategies:

linkText :

new WebDriverWait(driver, 20).until(ExpectedConditions.elementToBeClickable(By.linkText("Title"))).click();

cssSelector :

new WebDriverWait(driver, 20).until(ExpectedConditions.elementToBeClickable(By.cssSelector("dd.qview-product-name a[href='Link_here']"))).click();

xpath :

new WebDriverWait(driver, 20).until(ExpectedConditions.elementToBeClickable(By.xpath("//dd[@class='qview-product-name']//a[@href='Link_here' and text()='Title']"))).click();

确保:

• JDK 已升级到当前级别JDK 8u222 .
• 硒已升级到当前级别版本3.141.59 .
• ChromeDriver 已更新为当前的ChromeDriver v77.0 级别.
• Chrome 已更新为当前的 Chrome版本77.0 级别.(根据 ChromeDriver v77.0发行说明)
通过 IDE
• 清理您的项目工作区和重建您的项目，并且仅具有必需的依赖项.
• 如果您的基本 Web客户端版本太旧，则将其卸载并安装最新版本的 Web客户端 GA.
• 进行系统重启.
• 以非root用户用户的身份执行 @Test .

• JDK is upgraded to current levels JDK 8u222.
• Selenium is upgraded to current levels Version 3.141.59.
• ChromeDriver is updated to current ChromeDriver v77.0 level.
• Chrome is updated to the current Chrome Version 77.0 level. (as per ChromeDriver v77.0 release notes)
• Clean your Project Workspace through your IDE and Rebuild your project with required dependencies only.
• If your base Web Client version is too old, then uninstall it and install a recent GA and released version of Web Client.
• Take a System Reboot.
• Execute your @Test as non-root user.

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