JSTL access a map value by key

Question

I have a Map keyed by Integer. Using JSTL, how can I access a value by its key?

Map<Integer, String> map = new HashMap<Integer, String>();
map.put(1, "One");
map.put(2, "Two");
map.put(3, "Three");

I thought this would work but it doesn't (where map is already in the request's attributes):

<c:out value="${map[1]}"/>

Follow up: I tracked down the problem. Apparently ${name[1]} does a map lookup with the number as a Long. I figured this out when I changed HashMap to TreeMap and received the error:

java.lang.ClassCastException: java.lang.Integer cannot be cast to java.lang.Long

If I change my map to be:

Map<Long, String> map = new HashMap<Long, String>();
map.put(1L, "One");

then ${name[1]} returns "One". What's with that? Why does <c:out> treat a number as a long. Seems counterintuitive to me (as int is more commonly used than long).

So my new question is, is there a JSTL tag notation to access a map by an Integer value?