ajaxCompleted expected condition

public static ExpectedCondition<Boolean> ajaxCompleted = new ExpectedCondition<Boolean>() {
        boolean result;
        @Override
        public Boolean apply(WebDriver driver) {
            try {
                result = (Boolean) ((JavascriptExecutor) driver).executeScript("return typeof($) !== 'undefined' && $.active == 0");
                System.out.println("Ajax return $.active == 0  is: '" + result + "'");
            } catch (Exception e) {
                return false;
            }
            return result;
        }

        public String toString() {
            return "Ajax return $.active == 0  is: '" + result + "'";
        }