Re: myMap.get(myKey) with JSTL?

This works:
    <c:out value="${myKey}"/> Output: E.g. 4711
    <c:out value="${myMap}"/> Output: The content of the entire object

This however does not work(empty output):
    <c:out value="${myMap['4711']}"/>
    <c:out value="${myMap[myKey]}"/>
    <c:out value="${myMap.myKey}"/>
    <c:out value="${myMap.'4711'}"/>

myMap contains a String key and a bean as value. The bean encapsulates
a list (that contains other beans again), that I later want to iterate
over. What I would like to achieve is something like:
        <c:set value="${myMap[myKey]}" var="myBean"/>

To refer to properties of a bean or an Enum instance, items of a
collection, or attributes of an implicit object,
you use the . or [] notation, which is similar to the notation used by ECMAScript.

In contrast, an item in a Map can be accessed using a string literal key; no coercion is required:

${customer.orders["socks"]}

${departments[deptName]}
The value of the entry named deptName in the departments map.