The Problem = An instance of a null PK has been incorrectly provided for this
find operation.
how can I fix it ????
public class DeletePersonServlet extends HttpServlet {
@PersistenceUnit
private EntityManagerFactory emf;
@Resource
private UserTransaction utx;
protected void processRequest(HttpServletRequest request,
HttpServletResponse response)
throws ServletException, IOException
{
assert emf != null;
EntityManager em = null;
try {
String id = (String) request.getParameter("id");
utx.begin();
em = emf.createEntityManager();
Person person = em.find(Person.class, id);
em.remove(person);
utx.commit();
request.getRequestDispatcher("ListPerson").forward(request,
response);
} catch (Exception ex) {
throw new ServletException(ex);
} finally {
if(em != null) {
em.close();
}
}
}
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