Problem with arrayList e session jsp

Question

I have a problem with my program.

I have a servlet; in this servlet save the session attribute

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

Now the attribute is a String and not an ArrayList. In fact when i try to do:

request.getsession().getAttribute(list)

is a string and not an Array.

I want an Array.

Thanks

Answer 1

You have to cast when you get the attribute from the session like this:

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

And the attributes in the session are stored in a map, that is why the key you used is a String and you have to use a string to retrieve the value.