jodd-core/src/main/java/jodd/util/ResourceBundleMessageResolver.java
public String getMessage(final String bundleName, final Locale locale, final String key) {
		ResourceBundle bundle = findResourceBundle(bundleName, locale);
		if (bundle == null) {
			return null;
		}

/*		//jdk6:
		if (bundle.containsKey(key) == false) {
			return null;
		}
*/
		try {
			return bundle.getString(key);
		} catch (MissingResourceException mrex) {
			return null;
		}
	}
public String getMessage(final String bundleName, final Locale locale, final String key) {
		ResourceBundle bundle = findResourceBundle(bundleName, locale);
		if (bundle == null) {
			return null;
		}

/*		//jdk6:
		if (bundle.containsKey(key) == false) {
			return null;
		}
*/
		try {
			return bundle.getString(key);
		} catch (MissingResourceException mrex) {
			return null;
		}
	}
Gets the message from the named resource bundle. Performs the failback only when
bundle name or locale are not specified (i.e. are <code>null</code>).