Java – ArrayList e session JSP

There is something wrong with my procedure

I have a servlet; Save session properties in this Servlet

ArrayList<Integer> list = new ArrayList<Integer>;
list.add(1);
request.getsession().setAttribute("list",list);

Now the property is string instead of ArrayList In fact, when I try to do:

request.getsession().getAttribute(list)

Is a string, not an array

I want an array

thank you

Solution

When you get properties from a session, you must cast:

ArrayList<Integer> list = (ArrayList<Integer>)request.getsession().getAttribute("list");

And the properties in the session are stored in the map, which is why the key you use is string. You must use string to retrieve the value