Hello,
Was there anyone that was able to solve this issue.
I have pretty much what Ruben has. But when clicking the delete link, I am
unable to get the DeletePersonServlet.java to work without errors.
When I am trying the code, I keep getting one of the following errors:
java.lang.NullPointerException
or
javax.servlet.ServletException: java.lang.IllegalArgumentException: Object:
123 is not a known entity type.
Here's what I have for the code in the DeletePersonServlet.java. Maybe
it's missing something or a piece of it is not correct.
public class DeletePersonServlet extends HttpServlet {
@PersistenceUnit
//The emf corresponding to
private EntityManagerFactory emf;
@Resource
private UserTransaction utx;
protected void processRequest(HttpServletRequest request,
HttpServletResponse response)
throws ServletException, IOException {
assert emf != null; //Make sure injection went through correctly.
EntityManager em = null;
try {
String id = (String) request.getParameter("id");
//System.out.println("ID is: " + id);
//begin a transaction
utx.begin();
//create an em.
em = emf.createEntityManager();
em.merge(id);
em.remove(id);
//commit transaction
utx.commit();
} catch (Exception ex) {
throw new ServletException(ex);
} finally {
em.close();
}
}
}
Hopefully someone can point me in the right direction.
Beverly
Rudi
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Subject
10/12/2008 02:08 [java ee programming] JPA Basics
AM Homework 16
Please respond to
[EMAIL PROTECTED]
hoo.com
Hi Everyone,
I wrote the DeletePersonServlet.java. Then I added a link to the
ListPerson.jsp
for the Delete option.
However, I'm confused as to how to tie things together in order to
make the delete link work.
How do I get the Delete link to call my servlet?
I imagine that we leave the rest of the code in MyWebJPA the way it
is and that we don't need to change the ListPerson.jsp to use JSF tags
like <h:outputText or anything.
Thanks in advance.
Best regards.
Ruben
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