jodd-core/src/main/java/jodd/util/StringUtil.java
public static boolean containsOnlyWhitespaces(final CharSequence string) {
		int size = string.length();
		for (int i = 0; i < size; i++) {
			char c = string.charAt(i);
			if (!CharUtil.isWhitespace(c)) {
				return false;
			}
		}
		return true;
	}
public static boolean containsOnlyWhitespaces(final CharSequence string) {
		int size = string.length();
		for (int i = 0; i < size; i++) {
			char c = string.charAt(i);
			if (!CharUtil.isWhitespace(c)) {
				return false;
			}
		}
		return true;
	}
Returns <code>true</code> if string contains only white spaces.