<logic:iterate>无任何显示

<%@   taglib   uri="/tags/struts-logic"   prefix="logic"   % >
<%
  java.util.Vector   animals=new   java.util.Vector();
  animals.addElement("Dog");
  animals.addElement("Cat");
  animals.addElement("Bird");
  animals.addElement("Chick");
  request.setAttribute("Animals",   animals);
  % >
<logic:iterate   id="element"   name="Animals" >
      <%=element%> <BR >
</logic:iterate >