code: private void evaluateExpressions() throws JspException {
          /* 
           * Note: we don't check for type mismatches here; we assume
           * the expression evaluator will return the expected type
           * (by virtue of knowledge we give it about what that type is).
           * A ClassCastException here is truly unexpected, so we let it
           * propagate up.
           */
  
          if (escapeXml_ != null) {
              Boolean b = (Boolean) ExpressionUtil.evalNotNull(
                      "out",
                      "escapeXml",
                      escapeXml_,
                      Boolean.class,
                      this,
                      pageContext);
              if (b == null) {
                  escapeXml = false;
              } else {
                  escapeXml = b.booleanValue();
              }
          }
      }
docs: /* Evaluates expressions as necessary