Question

I’m trying to pass an ArrayList iterator to a JSP from a Spring class, but the values aren’t showing up when I use a c:foreach loop. Can anyone help? Here is the important part of my Spring class.

import org.springframework.ui.Model;
import org.springframework.web.servlet.mvc.Controller;
import org.springframework.web.servlet.ModelAndView;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import java.io.IOException;
import java.util.ArrayList;

public class HelloWorldController implements Controller {
    protected final Log logger = LogFactory.getLog(getClass());

    public ModelAndView handleRequest(HttpServletRequest request,
            HttpServletResponse response) throws ServletException, IOException {
        logger.info("Return View");
        ArrayList<RandomNumber> random = new ArrayList<RandomNumber>();
        for (int i = 1; i <= 10; i++) {
            RandomNumber number = new RandomNumber();
            number.setNumber((int) Math.random() * 100);
            random.add(number);
        }
        ModelAndView modelAndView = new ModelAndView("helloworld.jsp");
        Model model = (Model) modelAndView.getModel();
        model.addAllAttributes(random);
        return modelAndView;
    }
}

Here is the relevant part of my JSP.

<table>
<c:forEach var="random" items="${random}">
<tr><td>${random.number}</td></tr>
</c:forEach>
</table>

Answer 1

I’d change the line:

model.addAllAttributes(random);

to:

model.addObject("randoms", random); 

You now have a “randoms” attribute in the context (adding the ‘s’ to the name to resolve another issue I believe with the var naming). Then change the jsp to be (note random for the var name avoids overlap with randoms the collection):

<c:forEach var="random" items="${randoms}">