Implementing Domain Model

[damendra]

Hi,

I'm a newbie to seam and have the following question (using seam version 2.1.2, JBoss 5.0, MySQL 5).

The following is my domain model User has a Profile, a Profile has a Contact and Profile has Statement. Code as follows:

@SuppressWarnings("serial")
@Entity
@Name("user")
@Scope(ScopeType.PAGE)
public class User implements Serializable {

     private Long id;     
     private Profile profile;
        
       //..getters/setters 
        @OneToOne(cascade = CascadeType.ALL)
     @PrimaryKeyJoinColumn
     public Profile getProfile() {
          return profile;
     }

     public void setProfile(Profile profile) {
          this.profile = profile;
     }
}

@SuppressWarnings("serial")
@Entity
@Scope(ScopeType.PAGE)
@Name("profile")
public class Profile implements Serializable {

     private Long id;
     private User user;
     private Contact contact;
        private Statement statement;
       
        //...
        @OneToOne(cascade = CascadeType.ALL)
     @PrimaryKeyJoinColumn
     public Statement getStatement() {
          return statement;
     }

     public void setStatement(Statement statement) {
          this.statement = statement;
     }

        @OneToOne(cascade = CascadeType.ALL)
     @PrimaryKeyJoinColumn
     public Contact getContact() {
          return contact;
     }

     public void setContact(Contact contact) {
          this.contact = contact;
     }

     @OneToOne(mappedBy="profile", cascade = CascadeType.ALL)
     public User getUser() {
          return user;
     }

     public void setUser(User user) {
          this.user = user;
     }
}

@SuppressWarnings("serial")
@Entity
@Name("contact")
@Scope(ScopeType.PAGE)
public class Contact implements Serializable { 
     private Long id;
     private Profile profile;
       
       //...
        @OneToOne(mappedBy="contact", cascade=CascadeType.ALL)
     public Profile getProfile() {
          return profile;
     }
        //..setter
}
@SuppressWarnings("serial")
@Entity
@Name("statement")
@Scope(ScopeType.PAGE)
public class Statement implements Serializable {
     
     private Long id; 
     private String statement; 
     private Profile profile;
        //....
        
       @OneToOne(mappedBy="statement", cascade=CascadeType.ALL)
     public Profile getProfile() {
          return profile;
     }

     public void setProfile(Profile profile) {
          this.profile = profile;
     }
}

Persisting is done through Stateful Session Beans scoped in the Conversation Scope.

When i persist either the Contact or Statement i retrieve the User, from which i try and fetch the Profile. hence,

User loggedInUser = 
(User) entityManager
.createQuery("select u from User u where u.username=#{credentials.username}").getSingleResult();

Now when i persist Contact, i attach the Contact to the Profile and pass to em.persist()

if(loggedInUser.getProfile() != null) {
    Profile userProfile = loggedInUser.getProfile();
    userProfile.setContact(contact);
    contact.setProfile(userProfile);
    entityManager.persist(contact);
} 

- persists successfully. When i want to persist the Statement, i retrieve the profile added as above but it returns null.

Profile profile = loggedInUser.getProfile() //--returns null
profile.setStatement(statement);
statement.setProfile(profile);

Not sure why this is behaving as is. Can anyone provide some guidance please?

Regards