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Hibernate: Adding an element to a collection

Posted on 2009-05-18
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Last Modified: 2013-11-11
Hi everybody,
this question is also asked on javaranch:
http://www.coderanch.com/t/445436/Object-Relational-Mapping/java/Adding-element-collection
I'm not sure whether or not I should post it again here..anyway I did.
The question itself is in the code block, any help is highly appreciated!


// I have the following 3 classes (only approproate code is shown): 
// - Vestiging 
@Entity  
@Table(name = Vestiging.TABLE)   
public class Vestiging extends VersionedEntity {   
  
    public static final String TABLE = "ORG_VESTIGING";   
  
    private Set<VestigingOmschrijving> omschrijvingen;   
    private Set<VestigingEmail> emails;   
  
    @OneToMany(fetch = FetchType.LAZY, cascade = { CascadeType.ALL })   
    @JoinColumn(name = VestigingOmschrijving.VESTIGING_ID, nullable = false)   
    public Set<VestigingOmschrijving> getOmschrijvingen() {   
        if (omschrijvingen == null) {   
            omschrijvingen = new HashSet<VestigingOmschrijving>();   
        }   
        return omschrijvingen;   
    }   
    public void setOmschrijvingen(Set<VestigingOmschrijving> omschrijvingen) {   
        this.omschrijvingen = omschrijvingen;   
    }   
  
    @OneToMany(fetch = FetchType.LAZY, cascade = { CascadeType.ALL })   
    @JoinColumn(name = VestigingEmail.VESTIGING_ID, nullable = false)   
    public Set<VestigingEmail> getEmails() {   
        if (emails == null) {   
            emails = new HashSet<VestigingEmail>();   
        }   
        return emails;   
    }   
    public void setEmails(Set<VestigingEmail> emails) {   
        this.emails = emails;   
    }   
  
    // correct implementation of hashCode and equals   
} 
//----------------------------------------------------------------- 
// VestigingOmschrijving 
@Entity  
@Table(name = VestigingOmschrijving.TABLE)   
public class VestigingOmschrijving extends VersionedEntity {   
  
    public static final String TABLE = "ORG_VESTIGING_OMSCHRIJVING";   
  
    public static final String VESTIGING_ID = "VESTIGING_ID";   
    public static final String TAAL_ID = "TAAL_ID";   
    public static final String OMSCHRIJVING = "OMSCHRIJVING";   
  
    private Taal taal;   
    private String omschrijving;   
  
    @ManyToOne  
    @JoinColumn(name = TAAL_ID)   
    public Taal getTaal() {   
        return taal;   
    }   
    public void setTaal(Taal taal) {   
        this.taal = taal;   
    }   
  
    @Column(name = OMSCHRIJVING)   
    public String getOmschrijving() {   
        return omschrijving;   
    }   
    public void setOmschrijving(String omschrijving) {   
        this.omschrijving = omschrijving;   
    }   
  
    // correct implementation of hashCode and equals   
//-----------------------------------------------------------------
//VestigingEmail 
@Entity  
@Table(name = VestigingEmail.TABLE)   
public class VestigingEmail extends VersionedEntity {   
  
    public static final String TABLE = "ORG_VESTIGING_EMAIL";   
  
    public static final String VESTIGING_ID = "VESTIGING_ID";   
    public static final String EMAIL_ID = "EMAIL_ID";   
    public static final String EMAIL = "EMAIL";   
  
    private EmailCode emailCode;   
    private String email;   
  
    @ManyToOne  
    @JoinColumn(name = EMAIL_ID)   
    public EmailCode getEmailCode() {   
        return emailCode;   
    }   
  
    public void setEmailCode(EmailCode emailCode) {   
        this.emailCode = emailCode;   
    }   
  
    @Column(name = EMAIL)   
    public String getEmail() {   
        return email;   
    }   
  
    public void setEmail(String email) {   
        this.email = email;   
    }   
  
    // correct implementation of hashCode and equals   
}  
//-----------------------------------------------------------------
 
/* When the following code is executed, i see in the console 1 insert statement and 2 update statements generated (and when i look into the database, the new VestigingOmschrijving is added to the appropriate table). so it works like a charm and does what i expect.  */
 
       
Vestiging entity = vestigingDao.findById(vestigingId); // gets the entity via the entityManager   
VestigingOmschrijving omschr = new VestigingOmschrijving();   
omschr.setTaal(taalDao.findById(taalId));   
omschr.setOmschrijving("ABCDEF");   
entity.getOmschrijvingen().add(omschr);  
    
Vestiging entity = vestigingDao.findById(vestigingId); // gets the entity via the entityManager
VestigingOmschrijving omschr = new VestigingOmschrijving();
omschr.setTaal(taalDao.findById(taalId));
omschr.setOmschrijving("ABCDEF");
entity.getOmschrijvingen().add(omschr);
 
 
/* When I try to do the same for VestigingEmail, but no insert/update statements are generated and the new email address is not added to the database. */
       
Vestiging entity = vestigingDao.findById(vestigingId); // gets the entity via the entityManager   
VestigingEmail email = new VestigingEmail();   
email.setEmailCode(emailCodeDao.findById(emailCodeId));   
email.setEmail("test@test.com");   
entity.getEmails().add(email);  
    
Vestiging entity = vestigingDao.findById(vestigingId); // gets the entity via the entityManager
VestigingEmail email = new VestigingEmail();
email.setEmailCode(emailCodeDao.findById(emailCodeId));
email.setEmail("test@test.com");
entity.getEmails().add(email);
 
 
/* I have totally no clue about why the VestigingEmail is not added, but the VestigingOmschrijving is. Code seems similar to me, so totally lost on this.  
Any help highly appreciated
*/

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Question by:themuppeteer
2 Comments
 
LVL 12

Expert Comment

by:Gibu George
ID: 24410498
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LVL 2

Accepted Solution

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themuppeteer earned 0 total points
ID: 24411561
we found it.. apperantly a nullpointer was thrown (in a non shown method) because we used the id of a non committed entity.. the 'VestigingOmschrijving' worked because the id was not used but the value (a string)
thnx for reading this anyway!
 
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