[quote]
*****FIRST ACTIVITY*****
<a href="DeletePersonServlet"><strong>Delete</strong></a>

*****SECOND ACTIVITY*****
String id = (String) request.getParameter("id");
[/quote]

At FIRST ACTIVITY, you add a link to delete a person and at SECOND
ACTIVITY, you read request parameter as id for a person.
It should be <a href="DeletePersonServlet.html?id=$
{person.id}"><strong>Delete</strong></a> (i assume your servlet
mapping use .html extension)

Does id for class Person in String??
if so, String id = request.getParameter("id"); would be fine (no need
to cast)
if it is integer than your code should be like this int id =
Integer.parseInt(request.getParameter("id"));

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