In spring/mvc using if-then-else statement on the "model" in a jsp page

Question

i've this methodo in my servlet:

@Override
protected ModelAndView handleRequestInternal(HttpServletRequest request, HttpServletResponse response) throws Exception {

    Map<String, Object> myModel = new HashMap<String, Object>();

    [...do something...]

    model.put("msg","a message");

    return new ModelAndView("myPage", "model", myModel);

}   

Now in my myPage.jsp i want to do an if-then-else on ${model.msg} and i've tryed to use JSTL in this way:

        <c:choose>
            <c:when test="${!empty model.msg}">
                <p> not empty </p>
            </c:when>
            <c:otherwise>
                <p>empty</p>
            </c:otherwise>
        </c:choose>

But i get this warning and error: "test does not support run time expressions"

can i've some help? Thanks

Solution

Try with this,

        <c:choose>
            <c:when test="${not empty msg}">
                <p> not empty </p>
            </c:when>
            <c:otherwise>
                <p>empty</p>
            </c:otherwise>
        </c:choose>

Also, you must import JSTL 1.1 if not done.

<%@ taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c" %>