code: public static Object evaluate(String attributeName,
                                    String expression,
                                    Class expectedType,
                                    Tag tag,
                                    PageContext pageContext)
              throws JspException {
  
          // delegate the call
          return (EVALUATOR.evaluate(attributeName, expression, expectedType, tag, pageContext));
      }
docs: Invokes the evaluate() method on the "active" ExpressionEvaluator for the given pageContext.