JSTL printing issue

[Sripathi Krishnamurthy]

Hi,
I have this problem..

In a JAVA class I have the below code

  
HashMap map = new HashMap();
ArrayList list = new ArrayList();
list.add("user1");
list.add("user2");
map.put("role1", list);
request.setAttribute("param",map);

In a JSP, I have written a JSTL which is written this way,

<c:forEach items="${param}" var="roles">
<c:forEach items="${roles}" var="users" >
             <c:out value="${users}"/>
</c:forEach>
</c:forEach>

So basically what I have is, a Hashmap which has String as a key and an ArrayList object as a value.
When I try to run this, I get the error cannot run forEach for "items".
What part of code am I not writing correctly? Please help.

[Seetharaman Venkatasamy]

hai
culprit:
request.setAttribute("param",map);

change your name from param to param1 or something else..because param is one of the implicit object in EL...more over for:Each items should be collection or array

Hope THis Helps

[Sripathi Krishnamurthy]

Originally posted by seetharaman venkatasamy:
hai
culprit:
request.setAttribute("param",map);

change your name from param to param1 or something else..because param is one of the implicit object in EL...more over for:Each items should be collection or array

Hope THis Helps

The one I have given above is just an example. I havent used param as I have given there. The variable names that I am using in my application is entirely different. For this example, you can assume it as "param1" as you have indicated.
Thanks

[Seetharaman Venkatasamy]

insteadof <c:out value="${users}"/> you just use

${uesrs}...and let me know

[Steve Luke]

When you iterate over a map you are iterating over the entry set, not the map directly. This means that each value returned by the outer loop is a MapEntry, not an ArrayList. The MapEntry would have a method getValue() which would return the ArrayList to use for the inner loop. Example:

<c:forEach items="${param}" var="roles">
<c:forEach items="${roles.value}" var="users" >
             <c:out value="${users}"/>
</c:forEach>
</c:forEach>

[Seetharaman Venkatasamy]

Thanks luke

[Sripathi Krishnamurthy]

Originally posted by Steve Luke:
When you iterate over a map you are iterating over the entry set, not the map directly. This means that each value returned by the outer loop is a MapEntry, not an ArrayList. The MapEntry would have a method getValue() which would return the ArrayList to use for the inner loop. Example:

<c:forEach items="${param}" var="roles">
<c:forEach items="${roles.value}" var="users" >
             <c:out value="${users}"/>
</c:forEach>
</c:forEach>

Thank you very much. It is working fine now.
Regards