bject is a map, returns the most general type that this resolver accepts for the <code>property</code>
 argument. Otherwise, returns <code>null</code>.

 <p>
 Assuming the base is a <code>Map</code>, this method will always return <code>Object.class</code>. This is because
 <code>Map</code>s accept any object as a key.
 </p></div>
<dl>
<dt><span class="overrideSpecifyLabel">Specified by:</span></dt>
<dd><code><a href="../../javax/el/ELResolver.html#getCommonPropertyType-javax.el.ELContext-java.lang.Object-"