Search code examples
javajspjsp-tags

creating immutable objects in JSPs

I know you can use the <jsp:useBean> tag to instantiate objects within JSPs without resorting to scriptlet code. However I'd like to instantiate an Integer who value is the result of an EL expression, something like:

<jsp:useBean id="total" class="java.lang.Integer">
    <jsp:setProperty name="amount" value="${param1 + param2}"/>
</jsp:useBean>

Of course this won't work because Integer objects don't have a property named 'amount', the only way their value can be set is via a constructor parameter (i.e. Integer objects are immutable). Is there any way to instantiate such an object and set it's value without using scriptlet code?

Thanks, Don

Solution

  • <c:set var="amount" value="${param1 + param2}" scope="page" />