Constants in JSP 2.0

[Erik Pragt]

I've Googled, searched the forums, etc, but I could not find the answer to this simple question.
I've just started working with JSP 2.0. In JSP 1.2 is usualled used contants (or macro names) like this to retreive my session variables:

User user = (User) session.getAttribute(User.USER);

Now would like to do the same thing in JSP 2.0, but I was wondering if it's possible?
Consider the following example:

    <c:url var="orderLink" value="/Controller">
      <c :-P	 aram name="<%= Controller.COMMAND %>" value="<%= AddToCartAction.ADD_TO_CART %>" />
      <c :-P	 aram name="<%= Product.PRODUCT_ID %>" value="${product.productId}" />
      <c :-P	 aram name="<%= ShoppingCart.SHOPPING_CART_AMOUNT %>" value="1" />
    </c:url>

This doesn't look to nice, does it? I could rewrite it to:

    <c:url var="orderLink" value="/Controller">
      <c :-P	 aram name="command"   value="addToChart" />
      <c :-P	 aram name="productId" value="${product.productId}" />
      <c :-P	 aram name="amount"    value="1" />
    </c:url>

But now it doesn't use macro's anymore, and making typing errors, like writing command with a captial C, could mess up my whole application without knowing about it.
My question is: is there a nice solution to this issue?
Thanks,
Erik Pragt