Using model value as bean in JSP

Question

Given the following controller:

@Controller
public class LandingPageController {
    @RequestMapping(value = "/landingPage", method = RequestMethod.GET)
    public String landingPage(Map<String, Object> model) {
        model.put("page", new LandingPage());
        return "landingPage";
    }
}

This would be my jsp:

<c:forEach items="${page.links}" var="link">
    <a href="${link.reference}">${link.label}</a>
</c:forEach>

IntelliJ shows the following warning:

Cannot resolve variable 'page'

Using the quickfix, IntelliJ adds:

<jsp:useBean id="page" scope="request" type="com.myApp.LandingPage"/>

This in return leads to a duplicate variable exception on loading the site.

Now my question:

How can I define the variable in JSP (including its type) without creating a duplicate?**

What happens if you remove the useBean, ignore the IntelliJ warning, and deploy and run your app? — JB Nizet, Oct 20 '17 at 09:28
Thanks for the reply. The page is shown correctly without any errors. — Streetshark, Oct 20 '17 at 09:47
It is about having the support from the code completion and typo avoidance on fields / methods of the bean. Not just about being able to show the site. — Streetshark, Oct 20 '17 at 09:53
Then change your question. That's not at all what you're asking. But I'm afraid the answer is "there is no way: the JSP EL is a dynamic, reflection-based language" — JB Nizet, Oct 20 '17 at 09:55
Too bad there is no way. Thanks anyways for your clearification. — Streetshark, Oct 20 '17 at 11:59

score 1 · Answer 1 · answered Oct 20 '17 at 12:07

<%--@elvariable id="page" type="com.myApp.LandingPage"--%>
<c:forEach items="${page.links}" var="link">
    <a href="${link.reference}">${link.label}</a>
</c:forEach>

Using the @elvariable, type information is now available and IntelliJ gives code completion as well as warnings if method (getLinks in this example) does not exist

See this question

Using model value as bean in JSP

1 Answers1