Question

My JSP, is being passed an JSONObject in the context, on which it needs to do some processing like creating tables, etc.

But when I try to access the member of this object, it gives the following error –
(the name of one of the keys in this object is ok)

 Servlet.service() for servlet jsp threw exception { javax.servlet.jsp.el.ELException:
 Unable to find a value for "ok" in object of class "org.json.JSONObject" using operator "."

JSP Code accessing it looks like this –

<%@ taglib uri=”http://java.sun.com/jsp/jstl/core&#8221; prefix=”c”%>

<c:if test="${serviceOutput.ok}">
    <c:if test="${serviceOutput.ret.proposalCount} > 0">
.....

Can anyone please suggest how I can resolve this and successfully access all the members of this object?

Answer 1

EL only understands Javabeans and Maps. You need to let a preprocessing servlet convert each item of the JSONObject to a fullworthy Javabean which has getter methods which can be used in EL, or to a Map.

Here’s an example which converts it to a Map:

Map<String, Object> serviceMap = new HashMap<String, Object>();
serviceMap.put("ok", serviceOutput.getBoolean("ok"));
serviceMap.put("foo", serviceOutput.getString("foo"));
// ...

request.setAttribute("serviceMap", serviceMap);
request.getRequestDispatcher("/WEB-INF/page.jsp").forward(request, response);

This way EL expressions like ${serviceMap.ok} will work.