public class Testing {

    public void myTest()throws Exception {

       WebDriver driver = newRemoteWebDriver(new URL("http://localhost:4444/wd/hub"),DesiredCapabilities.firefox());

       driver.get("http://www.google.com");

        // RemoteWebDriverdoes not implement the TakesScreenshot class

        // if the driver doeshave the Capabilities to take a screenshot

        // then Augmenter willadd the TakesScreenshot methods to the instance

        WebDriver augmentedDriver = new Augmenter().augment(driver);

        File screenshot =((TakesScreenshot)augmentedDriver).getScreenshotAs(OutputType.FILE);

    }

}

java -jar selenium-server-standalone-2.46..jar -port