On 30-Mar-2010 09:34, Wesley Wu wrote:
> To make set method auto translated into a UPDATE clause, the
> entitymanager should be opened after a transaction begins.
>
>
Sincere thanks again, hopefully this will all help others coming across
it in the future.
If I understood you correctly I made those changes and now get
example.CourseServlet.emf : @PersistenceContext field must be assignable
from EntityManager.
Heres the new full servlet:
package example;
import java.io.IOException;
import java.io.PrintWriter;
import javax.inject.Inject;
import javax.persistence.EntityManager;
import javax.persistence.EntityManagerFactory;
import javax.persistence.PersistenceContext;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.transaction.UserTransaction;
public class CourseServlet extends HttpServlet
{
// Resin IoC will inject this
@PersistenceContext(unitName="example")
EntityManagerFactory emf;
@Inject
private UserTransaction ut;
public void service(HttpServletRequest request, HttpServletResponse
response)
throws IOException, ServletException
{
PrintWriter out = response.getWriter();
response.setContentType("text/html");
EntityManager em = null;
try {
ut.begin();
em = emf.createEntityManager();
CourseBean updateCourse = em.find(CourseBean.class, new
Integer(1));
updateCourse.setCourse("Magic");
ut.commit();
} catch (Exception e) {
e.printStackTrace();
} finally {
if (em != null && em.isOpen()) {
em.close();
}
}
}
}
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