Exception in iterating json value using jstl core

Question

I generate the json object in spring controller class like below

My Controller Class:
            Map<String,Object> model=new HashMap<String,Object>();
             model.put("project", project);
             model.put("roles", userService.dispRoles());
            for(int i=0;i<phaseList.size();i++){

                        TblProjectPhase projectPhase=phaseList.get(i);
                         try {
                            json=new JSONObject();
                            json.put("phasename", projectPhase.getPhaseName());
                            json.put("remain", getRemainingResource(projectPhase));
                                json.put("users",sessionfactory.getCurrentSession().createCriteria(TblProjectResource.class)
                    .add(Restrictions.eq("tblProjectPhase",phase))
                    .list());
                            ja.put(json);
                        } catch (JSONException e) {
                            // TODO Auto-generated catch block
                            e.printStackTrace();
                        }
                    }
                    JSONObject res=new JSONObject();
                    res.put("result", ja);
             model.put("userList",res );

and my json object looks like below

{"result":[
{"phasename":"BVFD Phase1",
"remain":0,
"users":
["TblProjectResource@1cb5e384",
"TblProjectResource@1cb5e385"]
}
]}

i tried to iterate this in my jstl core like below

<c:choose>
                             <c:when test="${not empty model.userList }">
                             <c:forEach var="user" items="${model.userList}">
                             <c:forEach var="child" items="${user.result}">
                             <c:out value="${child.phasename}"/>
                              <c:forEach items="child.users" var="u">
                               <c:out value="u.name"/>
                             </c:forEach>
                             </c:forEach></c:when>
                             <c:otherwise>No Users Availble In this Phase</c:otherwise></c:choose>

but my code throws exception in browser.The exception is

javax.servlet.ServletException: javax.servlet.jsp.JspTagException: Don't know how to iterate over supplied "items" in &lt;forEach&gt;

How to iterate the coorect way in my json using jstl? Any Help will be greatly appreciated!!!

The JSTL and the JSP EL doesn't work with JSON. They work with Java beans and collections. — JB Nizet, Oct 30 '14 at 07:13

score 1 · Accepted Answer · edited May 23 '17 at 10:29

1

<c:forEach> tag can iterate only a Collection, Map, Iterator, Enumeration or String. Anything else can't be iterated by <c:forEach>.

As userList in the request is of JSONObject type you can't iterate it using jstl . you can rather try with javascript to iterate.

Addional Info and Work arounds here

edited May 23 '17 at 10:29

Community

1
1

answered Oct 30 '14 at 07:14

Santhosh

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Exception in iterating json value using jstl core

1 Answers1