As announced some time ago, FirefoxDriver will no longer work after Firefox 47 has been released. There are 2 options;

1. Downgrade Firefox (version < 47)
2. Implement Marionette Driver. (Marionette WebDriver)

This blogpost will cover the implementation of Marionette Driver. Luckily it’s not too hard to switch to MarionetteDriver. Following these steps:

1. Download Marionette Driver
2. Extract the file
3. Set the webdriver.gecko.driver property to the location path of Marionette driver
4. Adjust the code, to something like this:

   	@BeforeClass
   	public void startFirefox() {
   		System.setProperty("webdriver.gecko.driver", "path/to/geckodriver");
   		final WebDriver driver = new FirefoxDriver();
   		driver.get("http://www.google.com");
   	}
   

Alternatively, we can implement a method to find the file on path:

	private static String findFileOnPath(final String fileName) {
		return MarionetteDriverTest.class.getClassLoader().getResource(fileName).getPath();
	}

MarionetteDriverTest is the classname.

And use it like this:

	@BeforeClass
	public void startFirefox() {
		System.setProperty("webdriver.gecko.driver", findFileOnPath("geckodriver")); //assuming the file is located in the resources folder
		final WebDriver driver = new FirefoxDriver();
		driver.get("http://www.google.com");
	}

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