Java 尝试双方言会话，假设Postel'；s定律适用于远端&；使用ChromeDriver和Selenium返回到原始OSS JSON_Java_Selenium_Google Chrome_Selenium Webdriver_Selenium Chromedriver

Java 尝试双方言会话，假设Postel'；s定律适用于远端&；使用ChromeDriver和Selenium返回到原始OSS JSON

java selenium google-chrome selenium-webdriver

Java 尝试双方言会话，假设Postel'；s定律适用于远端&；使用ChromeDriver和Selenium返回到原始OSS JSON,java,selenium,google-chrome,selenium-webdriver,selenium-chromedriver,Java,Selenium,Google Chrome,Selenium Webdriver,Selenium Chromedriver,下面是我用来初始化chrome webdriver的代码片段： System.out.println("Initializing Chrome"); ChromeOptions options = new ChromeOptions(); //options.setBinary("C:/Program Files (x86)/Google/Chrome/Application"); options.addArguments("start-maximized"); options.setExper

下面是我用来初始化chrome webdriver的代码片段：

System.out.println("Initializing Chrome");
ChromeOptions options = new ChromeOptions();
//options.setBinary("C:/Program Files (x86)/Google/Chrome/Application");
options.addArguments("start-maximized");
options.setExperimentalOption("excludeSwitches",new String[]{"enable-automation"});
options.addArguments("--disable-extensions");
options.addArguments("--disable-infobars");
options.addArguments("--allow-running-insecure-content");
WDriver = new ChromeDriver(options);
//WDriver = new ChromeDriver();
WDriver.manage().timeouts().implicitlyWait(60,TimeUnit.SECONDS);
System.out.println("Chrome Initialization Complete");

但它似乎打开了两个chrome实例，这显示在控制台上：

Initializing Chrome
Starting ChromeDriver 78.0.3904.70 (edb9c9f3de0247fd912a77b7f6cae7447f6d3ad5-refs/branch- 
heads/3904@{#800}) on port 12262
Only local connections are allowed.
Please protect ports used by ChromeDriver and related test frameworks to prevent access by malicious 
code.
Nov 04, 2019 3:29:38 PM org.openqa.selenium.remote.ProtocolHandshake createSession
INFO: Attempting bi-dialect session, assuming Postel's Law holds true on the remote end
log4j:WARN No appenders could be found for logger 
(org.apache.http.client.protocol.RequestAddCookies).
log4j:WARN Please initialize the log4j system properly.
log4j:WARN See http://logging.apache.org/log4j/1.2/faq.html#noconfig for more info.
[1572910181.451][WARNING]: Timed out connecting to Chrome, retrying...
Nov 04, 2019 3:29:43 PM org.openqa.selenium.remote.ProtocolHandshake createSession
INFO: Falling back to original OSS JSON Wire Protocol.
[1572910186.002][WARNING]: Timed out connecting to Chrome, retrying...
Nov 04, 2019 3:29:48 PM org.openqa.selenium.remote.ProtocolHandshake createSession
INFO: Detected dialect: OSS
Chrome Initialization Complete

Chrome版本：78.0.3904.87

Chromedriver版本：Chromedriver_78.0.3904.70

Selenium版本：3.141.59

虽然这个问题不是一个主要障碍，但它打开了第二个chrome实例，在待机状态下会消耗内存，这有点令人恼火

干杯

有几件事你需要注意：

此错误消息

Nov 04, 2019 3:29:38 PM org.openqa.selenium.remote.ProtocolHandshake createSession
INFO: Attempting bi-dialect session, assuming Postel's Law holds true on the remote end

Nov 04, 2019 3:29:43 PM org.openqa.selenium.remote.ProtocolHandshake createSession
INFO: Falling back to original OSS JSON Wire Protocol.
[1572910186.002][WARNING]: Timed out connecting to Chrome, retrying...
Nov 04, 2019 3:29:48 PM org.openqa.selenium.remote.ProtocolHandshake createSession
INFO: Detected dialect: OSS

…意味着ChromeDriver无法启动/生成新的网络浏览器，即Chrome浏览器会话

根据讨论，该问题是在2016-09-01 14:57:03-0700发布的Selenium Client v3.0.0-beta3上观察到的

西蒙在一篇文章中提到：

根本原因是ClassCastException。现在，我们捕获该异常，记录我们试图解析的内容，并继续进行其他尝试以完成握手。该修复程序在Selenium Client v3.0.0-beta4中提供。

最合适的解决办法是：

将Selenium升级到当前的级别

您可以在中找到详细的讨论

下一个错误消息

Nov 04, 2019 3:29:38 PM org.openqa.selenium.remote.ProtocolHandshake createSession
INFO: Attempting bi-dialect session, assuming Postel's Law holds true on the remote end

Nov 04, 2019 3:29:43 PM org.openqa.selenium.remote.ProtocolHandshake createSession
INFO: Falling back to original OSS JSON Wire Protocol.
[1572910186.002][WARNING]: Timed out connecting to Chrome, retrying...
Nov 04, 2019 3:29:48 PM org.openqa.selenium.remote.ProtocolHandshake createSession
INFO: Detected dialect: OSS

…还意味着您使用的ChromeDriver/Chrome浏览器组合不是最新的组合，因为ChromeDriver的当前实现遵循W3C，初始日志如下所示：

Starting ChromeDriver 78.0.3904.70 (edb9c9f3de0247fd912a77b7f6cae7447f6d3ad5-refs/branch-heads/3904@{#800}) on port 9626
Only local connections are allowed.
Please protect ports used by ChromeDriver and related test frameworks to prevent access by malicious code.
Nov 05, 2019 3:41:53 PM org.openqa.selenium.remote.ProtocolHandshake createSession
INFO: Detected dialect: W3C

解决方案确保：

JDK已升级到当前级别
硒被提升到当前水平
ChromeDriver已更新到当前级别
Chrome更新到当前的Chrome版本78.0级别。（根据）
通过IDE清理项目工作区，并仅使用所需的依赖项重建项目
（仅限Windows OS）在执行测试套件之前和之后，使用该工具清除所有操作系统杂务
（仅限LinuxOS）在执行测试套件之前和之后
如果您的基本Web客户端版本太旧，请卸载它并安装最新的GA和Web客户端发布版本
重新启动系统
以非root用户身份执行
```
@Test
```
始终在
```
tearDown（）{}
```
方法中调用
```
driver.quit（）
```
，以优雅地关闭和销毁Web驱动程序和Web客户端实例

工具书类您可以在以下内容中找到一些相关讨论：

奥特罗根据本文，Selenium v3.0.1的

协议握手.java

文件中的

createSession（）

包含以下内容：

public Result createSession(HttpClient client, Command command)
    throws IOException {
    // Avoid serialising the capabilities too many times. Things like profiles are expensive.

    Capabilities desired = (Capabilities) command.getParameters().get("desiredCapabilities");
    desired = desired == null ? new DesiredCapabilities() : desired;
    Capabilities required = (Capabilities) command.getParameters().get("requiredCapabilities");
    required = required == null ? new DesiredCapabilities() : required;

    String des = new BeanToJsonConverter().convert(desired);
    String req = new BeanToJsonConverter().convert(required);

    // Assume the remote end obeys the robustness principle.
    StringBuilder parameters = new StringBuilder("{");
    amendW3CParameters(parameters, des, req);
    parameters.append(",");
    amendOssParamters(parameters, des, req);
    parameters.append("}");
    LOG.info("Attempting bi-dialect session, assuming Postel's Law holds true on the remote end");
    Optional result = createSession(client, parameters);

    // Assume a fragile OSS webdriver implementation
    if (!result.isPresent()) {
      parameters = new StringBuilder("{");
      amendOssParamters(parameters, des, req);
      parameters.append("}");
      LOG.info("Falling back to original OSS JSON Wire Protocol.");
      result = createSession(client, parameters);
    }

    // Assume a fragile w3c implementation
    if (!result.isPresent()) {
      parameters = new StringBuilder("{");
      amendW3CParameters(parameters, des, req);
      parameters.append("}");
      LOG.info("Falling back to straight W3C remote end connection");
      result = createSession(client, parameters);
    }

    if (result.isPresent()) {
      Result toReturn = result.get();
      LOG.info(String.format("Detected dialect: %s", toReturn.dialect));
      return toReturn;
    }

    throw new SessionNotCreatedException(
      String.format(
        "Unable to create new remote session. " +
        "desired capabilities = %s, required capabilities = %s",
        desired,
        required));
}

您需要注意以下几件事：