Get value from hashmap based on key to JSTL

Question

I want to get the value of HashMap based on key.

HashMap<String, ArrayList<String>> map 
    = new HashMap<String, ArrayList<String>>();
ArrayList<String> arrayList = new ArrayList<String>();

map.put("key", arrayList);
request.setAttribute("key", map);

What i did is

<c:forEach var="map" items="${requestScope.key}">
    <c:forEach var="hash" items="${map.value}">
        <option><c:out value="${hash}"/></option>
    </c:forEach>
</c:forEach>

But it seems it's printing everything, what i want to do is to get the value depends on key like: hash.key or something

UPDATE:
I did something like this but it still doesn't work

<c:forEach var="map" items="${requestScope.key}">
    <c:forEach var="hash" items="${map['key']}">
        <option><c:out value="${hash}"/></option>
    </c:forEach>
</c:forEach>

and the StackTrace: Property 'External' not found on type java.util.HashMap$Entry
I'm pretty sure that there is really that kind of key.

Solution 1

if all you're trying to do is get the value of a single entry in a map, there's no need to loop over any collection at all. simplifying gautum's response slightly, you can get the value of a named map entry as follows:

<c:out value="${map['key']}"/>

where 'map' is the collection and 'key' is the string key for which you're trying to extract the value.

Solution 2

could you please try below code

<c:forEach var="hash" items="${map['key']}">
        <option><c:out value="${hash}"/></option>
  </c:forEach>

Comments

[Gonzalo]

This should be the accepted answer, but note that quote marks for value are missing <c:out value="${map['key']}"/>

[MR AND]

This is what my map looks like {key1=23, key2=1, key3=0}. I get this error while using the code above: javax.el.PropertyNotFoundException: Property 'key1' not found on type java.util.HashMap$Node

[yaylitzis]

If key is type of Integer then you should get the value using <c:out value="${map[(1).intValue()]}"/> (Anwser from: stackoverflow.com/a/924556/2594961 )