code: public String resolveStaticField(ValueExpression exprVE) {
          if (exprVE != null) {
              String exprStr = exprVE.getExpressionString();
              Matcher matcher = STATIC_FIELD_PATTERN.matcher(exprStr);
              if (matcher.find()) {
                  return matcher.group(1);
              }
          }
          return null;
      }
docs: Extract bean's property from a value expression (e.g "#{car.year}")
  @param exprVE value expression
  @return bean's property name (e.g "year")