Setting up browsermob proxy with ChromeDriver

Question

I'm trying to set up browsermob to work in my selenium project. I was looking for a way to use ChromeOptions to set the proxy, but all sources tell me to use ChromeOptions for everything else, then convert it into DesiredCapabilities before instantiating a new ChromeDriver instance.

This is my code:

ChromeOptions options = new ChromeOptions();
// Setting some chrome features here

ProxyServer proxyServer = new ProxyServer(4444);
proxyServer.start();

Proxy proxy = proxyServer.seleniumProxy();

DesiredCapabilities capabilities = DesiredCapabilities.chrome();

capabilities.setCapability(ChromeOptions.CAPABILITY, options);
capabilities.setCapability(CapabilityType.PROXY, proxy);

WebDriver driver = new ChromeDriver(capabilities); // Error happens here

I'm using Webdriver version 2.44 from the maven repositories. This is the error I get:

java.lang.IllegalAccessError: tried to access field com.google.gson.JsonNull.INSTANCE from class org.openqa.selenium.remote.BeanToJsonConverter

Does anyone know the cause or any alternative solutions for hooking up a proxy to chromedriver?

Answer 1

ChromeDriver doesn't support the proxy caps directly. But it does support passing command line args to the chrome process. And setting the http proxy is one of chrome command line switches. It can be set as follows:

DesiredCapabilities caps = DesiredCapabilities.chrome();    
ArrayList<String> switches = new ArrayList<String>();    
switches.add("--proxy-server=localhost:8080");    
caps.setCapability("chrome.switches", switches);    
webDriver = new ChromeDriver(caps);