Selenium radiobutton selection - selenium

Question

I have an HTML code as follows:
<label class="top" for="id_gender2">
<div id="uniform-id_gender2" class="radio">
<span>
<input id="id_gender2" type="radio" value="2" name="id_gender">
</span>
</div>
Mrs.
</label>
The radio button is getting selected after mouse hover.
I have tried with all possible attributes for selection but I am getting element not found exception.Please let me know how to write java script in webdriver.

Answer 1

Try following code and let me know the result:
Actions action = new Actions(driver);
WebElement hover = driver.findElement(By.xpath("//*[#class='radio hover']"));
action.moveToElement(hover).moveToElement(driver.findElement(By.xpath("//input[#id='id_gender2']"))).click().build().perform();
UPDATE
Actually there is no need in mouse hover. Target radio seem to be initially non-clickable, so you just need extra time to wait for page complete rendering:
WebDriverWait wait = new WebDriverWait(driver, 15);
wait.until(ExpectedConditions.elementToBeClickable(By.cssSelector("input#id_gender2")));
driver.findElement(By.cssSelector("input#id_gender2")).click();

Answer 2

Try javascript executor as follow:
WebElement element = driver.findElement(By.id("id_gende‌​r2"));
((JavascriptExecutor) driver).executeScript("arguments[0].click();", element);

Answer 3

Your element is probably not loaded properly while getting error. You'd better use explicit wait in your script. Wait until your specific element loaded to be visible/clickable. I think, this may help you.
Code snippet:
By yourElementToSelect = By.id("id_gender2");
WebDriverWait wait = new WebDriverWait(driver, 20);
wait.until(ExpectedConditions.visibilityOfElementLocated(yourElementToSelect));
driver.findElement(yourElementToSelect).click();