[jboss-user] [JBoss Seam] - Problems with list page, persistence, and detached entities

[Oberiko]

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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