I use SoapUI Pro 5.1.2 on Win7 x32, and try to connect to Selenium Webdriver in Groovy TestStep.
For this purpose I added selenium-standalone-server.jar
selenium-standalone-server.jar
Download latest driver(chrome or IE) from seleniumhq.org, and use below code
System.setProperty("webdriver.chrome.driver","chromedriver.exe"); WebDriver driver=new ChromeDriver(); driver.get("http://www.yahoo.com");
This worked for me.