Java Selenium - 无法使用一种方法启动多个 WebDriver

【问题标题】：Java Selenium - Unable to initiate multiple WebDriver with one MethodJava Selenium - 无法使用一种方法启动多个 WebDriver
【发布时间】：2017-06-19 17:06:11
【问题描述】：

我已经尝试了很长时间，但我无法让它发挥作用。 我想做的是以 Fluentlenium 为基础进行负载测试。 当我尝试启动我的测试时，它只打开一个 chrome 浏览器，在我的 IDE 中，相同的方法运行 3 次（例如）有时测试通过，有时它失败。它假设在不同的端口（由 selenium 生成）下启动 3 个 chrome 浏览器，但它没有，它只启动 1 个浏览器。

这是我失败的代码：

    public class Example extends FluentTestNg {
        private final static String DEFAULT_URL = "http://google.com";

        @Override
        public WebDriver newWebDriver() {
            DesiredCapabilities caps = new DesiredCapabilities();
            WebDriver driver = new ChromeDriver(caps);
            return driver;
        }


        @Test(invocationCount = 3, threadPoolSize = 3)
        public void GoogleTest() throws Exception {
            goTo(DEFAULT_URL);
            await().until($(".gsfi")).present();
            System.out.println(getCookies());
        }
    }

这是提供失败的堆栈跟踪

    Starting ChromeDriver 2.30.477690 (c53f4ad87510ee97b5c3425a14c0e79780cdf262) on port 14851
Only local connections are allowed.
Jun 19, 2017 12:53:03 PM org.openqa.selenium.remote.ProtocolHandshake createSession
INFO: Detected dialect: OSS
Jun 19, 2017 12:53:03 PM org.apache.http.impl.execchain.RetryExec execute

INFO: I/O exception (java.net.SocketException) caught when processing request to {}->http://localhost:14851: Broken pipe (Write failed)
Jun 19, 2017 12:53:03 PM org.apache.http.impl.execchain.RetryExec execute
INFO: Retrying request to {}->http://localhost:14851

org.openqa.selenium.NoSuchSessionException: no such session
  (Driver info: chromedriver=2.30.477690 (c53f4ad87510ee97b5c3425a14c0e79780cdf262),platform=Mac OS X 10.12.5 x86_64) (WARNING: The server did not provide any stacktrace information)
Command duration or timeout: 59 milliseconds
Build info: version: '3.3.1', revision: '5234b325d5', time: '2017-03-10 09:10:29 +0000'
Driver info: org.openqa.selenium.chrome.ChromeDriver
Capabilities [{applicationCacheEnabled=false, rotatable=false, mobileEmulationEnabled=false, networkConnectionEnabled=false, chrome={chromedriverVersion=2.30.477690 (c53f4ad87510ee97b5c3425a14c0e79780cdf262), userDataDir=/var/folders/1j/tdgn9dcn6d9g9dcd3fs8nj8c0000gn/T/.org.chromium.Chromium.yRHaZe}, takesHeapSnapshot=true, pageLoadStrategy=normal, databaseEnabled=false, handlesAlerts=true, hasTouchScreen=false, version=59.0.3071.86, platform=MAC, browserConnectionEnabled=false, nativeEvents=true, acceptSslCerts=true, locationContextEnabled=true, webStorageEnabled=true, browserName=chrome, takesScreenshot=true, javascriptEnabled=true, cssSelectorsEnabled=true, unexpectedAlertBehaviour=}]
Session ID: 25c29b733c90f9dff2afb69dee6dc1d5

    at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
    at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:62)
    at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)
    at java.lang.reflect.Constructor.newInstance(Constructor.java:423)
    at org.openqa.selenium.remote.ErrorHandler.createThrowable(ErrorHandler.java:216)
    at org.openqa.selenium.remote.ErrorHandler.throwIfResponseFailed(ErrorHandler.java:168)
    at org.openqa.selenium.remote.RemoteWebDriver.execute(RemoteWebDriver.java:638)
    at org.openqa.selenium.remote.RemoteWebElement.execute(RemoteWebElement.java:274)
    at org.openqa.selenium.remote.RemoteWebElement.isEnabled(RemoteWebElement.java:148)
    at org.fluentlenium.core.proxy.ComponentHandler.isStale(ComponentHandler.java:52)
    at org.fluentlenium.core.proxy.AbstractLocatorHandler.present(AbstractLocatorHandler.java:225)
    at org.fluentlenium.core.proxy.LocatorProxies.present(LocatorProxies.java:113)
    at org.fluentlenium.core.domain.FluentWebElement.present(FluentWebElement.java:132)
    at org.fluentlenium.core.conditions.AbstractObjectConditions.verify(AbstractObjectConditions.java:36)
    at org.fluentlenium.core.conditions.WebElementConditions.present(WebElementConditions.java:43)
    at org.fluentlenium.core.conditions.AbstractFluentListConditions.lambda$present$0(AbstractFluentListConditions.java:79)
    at org.fluentlenium.core.conditions.AtLeastOneElementConditions.lambda$buildAtLeastOnePredicate$0(AtLeastOneElementConditions.java:49)
    at org.fluentlenium.core.conditions.AtLeastOneElementConditions.verify(AtLeastOneElementConditions.java:35)
    at org.fluentlenium.core.conditions.AbstractFluentListConditions.present(AbstractFluentListConditions.java:79)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.lang.reflect.Method.invoke(Method.java:498)
    at org.fluentlenium.core.conditions.wait.WaitConditionInvocationHandler$2.apply(WaitConditionInvocationHandler.java:216)
    at org.fluentlenium.core.conditions.wait.WaitConditionInvocationHandler$2.apply(WaitConditionInvocationHandler.java:212)
    at org.fluentlenium.core.conditions.wait.WaitConditionInvocationHandler.lambda$until$0(WaitConditionInvocationHandler.java:156)
    at org.openqa.selenium.support.ui.FluentWait.until(FluentWait.java:209)
    at org.fluentlenium.core.wait.FluentWait.untilPredicate(FluentWait.java:131)
    at org.fluentlenium.core.conditions.wait.WaitConditionInvocationHandler.until(WaitConditionInvocationHandler.java:144)
    at org.fluentlenium.core.conditions.wait.WaitConditionInvocationHandler.until(WaitConditionInvocationHandler.java:175)
    at org.fluentlenium.core.conditions.wait.WaitConditionInvocationHandler.waitForCondition(WaitConditionInvocationHandler.java:212)
    at org.fluentlenium.core.conditions.wait.WaitConditionInvocationHandler.invoke(WaitConditionInvocationHandler.java:190)
    at com.sun.proxy.$Proxy8.present(Unknown Source)
    at Example.GoogleTest(Example.java:27)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.lang.reflect.Method.invoke(Method.java:498)
    at org.testng.internal.MethodInvocationHelper.invokeMethod(MethodInvocationHelper.java:86)
    at org.testng.internal.Invoker.invokeMethod(Invoker.java:643)
    at org.testng.internal.Invoker.invokeTestMethod(Invoker.java:820)
    at org.testng.internal.Invoker.invokeTestMethods(Invoker.java:1128)
    at org.testng.internal.TestMethodWorker.invokeTestMethods(TestMethodWorker.java:129)
    at org.testng.internal.TestMethodWorker.run(TestMethodWorker.java:112)
    at org.testng.internal.thread.ThreadUtil$2.call(ThreadUtil.java:64)
    at java.util.concurrent.FutureTask.run(FutureTask.java:266)
    at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
    at java.lang.Thread.run(Thread.java:748)


org.openqa.selenium.TimeoutException: Expected condition failed: Elements By.cssSelector: .gsfi (Lazy Element List) is not present (tried for 5 second(s) with 500 MILLISECONDS interval)
Build info: version: '3.3.1', revision: '5234b325d5', time: '2017-03-10 09:10:29 +0000'
Driver info: driver.version: unknown

    at org.openqa.selenium.support.ui.FluentWait.timeoutException(FluentWait.java:264)
    at org.openqa.selenium.support.ui.FluentWait.until(FluentWait.java:232)
    at org.fluentlenium.core.wait.FluentWait.untilPredicate(FluentWait.java:131)
    at org.fluentlenium.core.conditions.wait.WaitConditionInvocationHandler.until(WaitConditionInvocationHandler.java:144)
    at org.fluentlenium.core.conditions.wait.WaitConditionInvocationHandler.until(WaitConditionInvocationHandler.java:175)
    at org.fluentlenium.core.conditions.wait.WaitConditionInvocationHandler.waitForCondition(WaitConditionInvocationHandler.java:212)
    at org.fluentlenium.core.conditions.wait.WaitConditionInvocationHandler.invoke(WaitConditionInvocationHandler.java:190)
    at com.sun.proxy.$Proxy8.present(Unknown Source)
    at Example.GoogleTest(Example.java:27)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.lang.reflect.Method.invoke(Method.java:498)
    at org.testng.internal.MethodInvocationHelper.invokeMethod(MethodInvocationHelper.java:86)
    at org.testng.internal.Invoker.invokeMethod(Invoker.java:643)
    at org.testng.internal.Invoker.invokeTestMethod(Invoker.java:820)
    at org.testng.internal.Invoker.invokeTestMethods(Invoker.java:1128)
    at org.testng.internal.TestMethodWorker.invokeTestMethods(TestMethodWorker.java:129)
    at org.testng.internal.TestMethodWorker.run(TestMethodWorker.java:112)
    at org.testng.internal.thread.ThreadUtil$2.call(ThreadUtil.java:64)
    at java.util.concurrent.FutureTask.run(FutureTask.java:266)
    at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
    at java.lang.Thread.run(Thread.java:748)

我有另一种工作正常的方法，但我必须通过 newWebDriver 方法才能工作......

public class Example extends FluentTestNg {
    private final static String DEFAULT_URL = "http://google.com";

    private static ThreadLocal<WebDriver> drivers = new ThreadLocal<WebDriver>();

    public void setWebdriver(WebDriver driver){
        drivers.set(driver);
    }

    @Override
    public WebDriver newWebDriver() {
        return drivers.get ();
    }

    @BeforeMethod
    public void launchbrowser(){
        WebDriver drivers = new ChromeDriver();
        setWebdriver(drivers);
    }


    @Test(invocationCount = 3, threadPoolSize = 3)
    public void GoogleTest() throws Exception {
        newWebDriver().get(DEFAULT_URL);
    }
}

这是它通过 3 个浏览器打开的控制台日志，但我不能使用 Fluentlenium 语法。

Starting ChromeDriver 2.30.477690 (c53f4ad87510ee97b5c3425a14c0e79780cdf262) on port 11700
Only local connections are allowed.
Starting ChromeDriver 2.30.477690 (c53f4ad87510ee97b5c3425a14c0e79780cdf262) on port 35621
Only local connections are allowed.
Starting ChromeDriver 2.30.477690 (c53f4ad87510ee97b5c3425a14c0e79780cdf262) on port 31113
Only local connections are allowed.
Jun 19, 2017 12:59:11 PM org.openqa.selenium.remote.ProtocolHandshake createSession
INFO: Detected dialect: OSS
Jun 19, 2017 12:59:11 PM org.openqa.selenium.remote.ProtocolHandshake createSession
INFO: Detected dialect: OSS
Jun 19, 2017 12:59:11 PM org.openqa.selenium.remote.ProtocolHandshake createSession
INFO: Detected dialect: OSS

唯一的问题是，我不能使用内置的 Fluentlenium 语法（例如：GoTo、GetCookies、Await 等）。我必须使用 Selenium 语法。

有什么方法可以让它只与 Fluentlenium 一起工作？

【问题讨论】：

  • 第一件事可能让您感到困惑的是您的drivers 变量名称。据我所知，您永远不会存储drivers 的集合，因此将所有这些更改为driver。其次，由于您希望同时运行一堆实例，您可能不应该将WebDriver 存储在静态变量中。希望能有所帮助:)
  • 虽然，如果您使用的是 ThreadLocal，也许您需要做的就是将您的 get 方法设为静态... IE public static WebDriver newWebDriver() 。您可能希望将该方法名称更改为 getDriver 或 getCurrentDriver，因为它也不会创建新方法。

标签： java multithreading selenium fluentlenium


【解决方案1】：

您可以尝试摆脱 ThreadLocal 并使您的 WebDriver 不是静态的。或者使用您当前的代码，它可能就像确保您的 ThreadLocal 字段的 get 方法是 static 一样简单：

public static WebDriver newWebDriver() {
    return drivers.get ();
}

我注意到你从某个地方覆盖了这个 newWebDriver 方法，我不完全清楚这是否真的是你想要在这里做的，因为我不知道它来自哪里。

【讨论】：

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