Example

public class WebEventListener implements WebDriverEventListener {
    private static final Logger logger = LoggerFactory.getLogger("automation.logs");
    private String oldValue;

    @Override
    public void beforeChangeValueOf(WebElement arg0, WebDriver arg1) {
        oldValue = arg0.getAttribute("value");
    }

    @Override
    public void afterChangeValueOf(WebElement arg0, WebDriver arg1) {
        String elementName = getElementName(arg0);
        try {
            String newValue = arg0.getAttribute("value");
            if (!newValue.equals(oldValue)) {
                if (newValue.length() == 0) {
                    logger.debug("[{}] - cleared value", elementName);
                } else {
                    logger.debug("[{}] - changed value to '{}'", elementName,
                            newValue);
                }
            }
        } catch (Exception e) {
            logger.debug("[{}] - changed value", elementName);
        }
    }
(...)
}