src/org/tiefaces/components/websheet/utility/ParserUtility.java
public static boolean isEmptyMethodString(final String str) {
		if (str == null) {
			return false;
		}
		return str.startsWith(TieConstants.METHOD_PREFIX);
	}
public static boolean isEmptyMethodString(final String str) {
		if (str == null) {
			return false;
		}
		return str.startsWith(TieConstants.METHOD_PREFIX);
	}
empty method string is start as $ follow with { and }. i.e.
${department.name}

@param str
the str
@return true, if is empty method string