protected void validateEqualString(String s1, String s2, String errorKey, String errorMessage) {
		if (s1 == null || s2 == null || (! s1.equals(s2))) {
			addError(errorKey, errorMessage);
		}
	}
protected void validateEqualString ( String s1 , String s2 , String errorKey , String errorMessage ) { if ( s1 == null || s2 == null || ( ! s1 . equals ( s2 ) ) ) { addError ( errorKey , errorMessage ) ; } }
Validate equal string.