Servlet - JSP

Servlet - JSP

i used arraylist in servlet as shown

ArrayList <Integer> total = new ArrayList <Integer>();
...
total.add(k[i]);

session.setAttribute("efg",total);

when I code this like in my jsp
<%ArrayList<Integer> data= new ArrayList<Integer>(); %>

<%Iterator itr;%>
<% //List data;
data= (ArrayList)session.getAttribute("efg");
for (itr=data.iterator(); itr.hasNext(); )
{
%>

<%=itr.next()%>

Its not printing the values. do i need to do any typecast or anything else. I'm sure mu k[i] have some value. please let me know. Its showing some exception at line iterator itr; and data= (ArrayList)session.getAttribute("efg"); like iterator is a raw type..
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