6:54 p.m.
Hello.
I seem to be doing something wrong with my Stateful Session Bean in that I can't seem
to have it persist properly.
I have a list page where I want to delete previously entered users. I've put the
@DataModel into the page scope, as I want it to be kept available until I leave the page.
| package org.domain.myProject.session;
|
| import static javax.persistence.PersistenceContextType.EXTENDED;
|
| import java.util.List;
|
| import javax.ejb.Remove;
| import javax.ejb.Stateful;
| import javax.persistence.EntityManager;
| import javax.persistence.PersistenceContext;
|
| import org.domain.myProject.entity.User;
| import org.domain.myProject.session.local.UserEditLocal;
| import org.jboss.seam.ScopeType;
| import org.jboss.seam.annotations.Destroy;
| import org.jboss.seam.annotations.Factory;
| import org.jboss.seam.annotations.In;
| import org.jboss.seam.annotations.Logger;
| import org.jboss.seam.annotations.Name;
| import org.jboss.seam.annotations.Out;
| import org.jboss.seam.annotations.datamodel.DataModel;
| import org.jboss.seam.annotations.datamodel.DataModelSelection;
| import org.jboss.seam.faces.FacesMessages;
| import org.jboss.seam.log.Log;
|
| @Stateful
| @Name("userEdit")
| public class UserEditForm implements UserEditLocal {
|
| @Logger
| private Log log;
|
| @In
| FacesMessages facesMessages;
|
| @PersistenceContext(type = EXTENDED)
| private EntityManager em;
|
| @DataModelSelection
| @Out(required=false)
| private User user;
|
| @DataModel(scope=ScopeType.PAGE)
| private List<User> users;
|
| @SuppressWarnings("unchecked")
| @Factory("users")
| public void findUsers(){
| log.info("********************************************* Finding the
users");
| if (users == null)
| log.info("users is null");
| else if (users.size() == 0)
| log.info("users has a size of zero");
| else
| log.info("Strange, because users has " +users.size() + "
entries");
| users = em.createQuery("from User u").getResultList();
| }
|
| public void remove(){
| log.info("Deleting user " +user.getName());
| em.remove(user);
| users.remove(user);
| }
|
| public void update() {
| //TODO write the update method
| }
|
| @Destroy @Remove
| public void destroy() {}
| }
|
The following is my console log:
| 19:48:04,917 INFO [STDOUT] Hibernate:
| insert
| into
| User
| (id, name)
| values
| (null, ?)
| 19:48:04,917 INFO [STDOUT] Hibernate:
| call identity()
| 19:48:04,917 INFO [SaveUserAction] John was saved.
| 19:48:08,401 INFO [UserEditForm] *********************************************
Finding the users
| 19:48:08,401 INFO [UserEditForm] users is null
| 19:48:08,417 INFO [STDOUT] Hibernate:
| select
| user0_.id as id0_,
| user0_.name as name0_
| from
| User user0_
| 19:48:11,323 INFO [UserEditForm] *********************************************
Finding the users
| 19:48:11,323 INFO [UserEditForm] users is null
| 19:48:11,323 INFO [STDOUT] Hibernate:
| select
| user0_.id as id0_,
| user0_.name as name0_
| from
| User user0_
| 19:48:11,323 INFO [UserEditForm] Deleting user Vader
| 19:48:11,339 INFO [STDOUT] Hibernate:
| delete
| from
| User
| where
| id=?
| 19:48:26,495 INFO [UserEditForm] *********************************************
Finding the users
| 19:48:26,495 INFO [UserEditForm] users is null
| 19:48:26,495 INFO [STDOUT] Hibernate:
| select
| user0_.id as id0_,
| user0_.name as name0_
| from
| User user0_
| 19:48:26,495 INFO [UserEditForm] Deleting user Skywalker
| 19:48:26,511 INFO [STDOUT] Hibernate:
| delete
| from
| User
| where
| id=?
|
And this is the page I'm calling it from:
| <!DOCTYPE composition PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
|
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
| <html xmlns="http://www.w3.org/1999/xhtml"
| xmlns:s="http://jboss.com/products/seam/taglib"
| xmlns:f="http://java.sun.com/jsf/core"
| xmlns:h="http://java.sun.com/jsf/html">
|
| <f:view>
| <h:messages />
| <h:form>
| <h:dataTable value="#{users}" var="user">
| <h:column>
| <f:facet name="header">
| <h:outputText value="Id" />
| </f:facet>
| <h:outputText value="#{user.id}" />
| </h:column>
| <h:column>
| <f:facet name="header">
| <h:outputText value="Name" />
| </f:facet>
| <h:outputText value="#{user.name}" />
| </h:column>
| <h:column>
| <f:facet name="header">
| <h:outputText value="Actions" />
| </f:facet>
| <s:button action="#{userEdit.remove()}" value="S.
Delete"/>
| <h:commandButton action="#{userEdit.remove()}" value="A.
Delete" />
| </h:column>
| </h:dataTable>
| </h:form>
| <s:button view="/user.xhtml" value="Return"/>
| </f:view>
|
| </html>
|
|
I think I understand that the s:button, since it's not passing the form back, is
basically treating everything as a new page, which is why it's not being persisted
(that's what I used in the above logs). When I try the <h:commandButton>
though, I get the following:
Exception during request processing:
| Caused by javax.servlet.ServletException with message: "#{userEdit.remove()}:
javax.ejb.EJBTransactionRolledbackException: Removing a detached instance
org.domain.myProject.entity.User#7"
Is there a way, barring putting the page in the session scope, to keep the entities from
being detached?
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