getServletContext (). getAttribute () type conversion issues

<%
String aname = null;
String avalue = null;
Enumeration enu = this.getServletContext (). getAttributeNames ();
while (enu.hasMoreElements ())
{
aname = (String) enu.nextElement ();
avalue = (String) getServletContext (). getAttribute (aname);
%>
<% = aname%> -----> <% = avalue%>

<%
}
%>