0 Replies Latest reply on Sep 24, 2009 9:45 PM by damendra

    Implementing Domain Model

    damendra Newbie

      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