From do-not-reply at jboss.com Mon Oct  1 12:37:02 2007
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From: djfjboss <do-not-reply at jboss.com>
To: jboss-user at lists.jboss.org
Subject: [jboss-user] [JBoss Seam] - Semantics of @Name, @DataModelSelection
Date: Mon, 01 Oct 2007 12:37:02 -0400
Message-ID: <32401118.1191256622925.JavaMail.jboss@colo-br-02.atl.jboss.com>

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In an attempt to learn Seam I am experimenting with a simple CRUD example, =
partly based on the Yuan/Heute book.

The integration example shows an edit link as:
<a href=3D"person.seam?pid=3D#{fan.id}">Edit</a>

With the Person class having:
@Entity
  | @Name("person")
  | public class Person {
  |   private long id;
  |   @Id @GeneratedValue
  |   public long getId() { return id;}
  |   public void setId(long id) { this.id =3D id; }

and person.xhtml having:
<h2>Edit #{person.name}</h2>
  | <h:form>
  | <input type=3D"hidden" name=3D"pid"
  |        value=3D"#{person.id}"/>

and the ManagerAction class having:
@Stateful
  | @Name("manager")
  | public class ManagerAction implements Manager {
  | =

  |   @In (required=3Dfalse) @Out (required=3Dfalse)
  |   private Person person;
  | =

  |   // @RequestParameter
  |   Long pid;
  | =

  |   @DataModel
  |   private List <Person> fans;
  | =

  |   @DataModelSelection
  |   private Person selectedFan;
  | =

  |   public void setPid (Long pid) {
  |     this.pid =3D pid;
  |     =

  |     if (pid !=3D null) {
  |       person =3D (Person) em.find(Person.class, pid);
  |     } else {
  |       person =3D new Person ();
  |     }
  |   }
  |   =

  |   public Long getPid () {
  |     return pid;
  |   }


Apologies for taking so long to get to the point but the issue I have is th=
at I keep getting property X not found on type Y.  I had assumed that a Per=
son instance would be maintained in the session state and injected/outjecte=
d as appropriate.

I had also assumed that the setPid method would be invoked via the edit lin=
k and thereby set person to the appropriate entity via the id, but this met=
hod isn't even called for me.  The fact that the RequestParameter annotatio=
n is commented out is a little disconcerting.

To make this work, up to a point, I have had to add @Scope(SESSION) to the =
entity and session beans but I still find that I am faced with a newly cons=
tructed Person instance rather than the one I thought I was operating on an=
d that had been outjected into the shared context.

In desperation, I've also tried using the @DataModelSelection but without s=
uccess - property not found again.

I suspect I'm missing something fundamental and have read about bijection a=
nd studied the example which look straightforward enough but something is m=
issing and I can't figure out what it is!



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iewtopic&p=3D4090337#4090337

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