How to persist collection attribute

[girlcoder]

Hi

Is there any special way to persist entity with Set attribute (many-to-many relationsip)?

Works fine without setting this attribute , but if I add something I get exception:

org.hibernate.HibernateException: Illegal attempt to associate a collection with two open sessions

Please Help Me

Agnieszka

[dthibau1]

Your problem here is that your attribute is associated with 2 Hibernate's session !!

(perharps in 2 seam's component ?)

[girlcoder]

How to check if I have 2 sessions ?

I when I changed the way to add to Set attribute
I had another exception here:

Different object with the same identifier value was already associeted with the session

Have you got any idea ?

[ganton516]

Without seeing the entity code, I would guess that what you need is a CascadeType.PERSIST on the parent entity.

i.e:

private Set<T> myStuff;

@ManyToMany(cascade={CascadeType.PERSIST})
public Set<T> getMyStuff() {
    return myStuff;
}

public void setMyStuff(Set<T> newStuff) {
    myStuff = newStuff;
}

This should cause any changes to the sub entity to be persisted when the parent entity is.

Hope this helps

g

[girlcoder]

I have this on first entity:

 private Set<CbShortCode> cbShortCodes = new HashSet<CbShortCode>(0);

@ManyToMany(cascade = CascadeType.ALL, fetch = FetchType.LAZY, mappedBy = "cbServices") 
     public Set<CbShortCode> getCbShortCodes() {
          return this.cbShortCodes;     
     }

     public void setCbShortCodes(Set<CbShortCode> cbShortCodes) {
          this.cbShortCodes = cbShortCodes;
          
     }

and this on second:

@ManyToMany(cascade = CascadeType.ALL, fetch = FetchType.LAZY) 
     @JoinTable(name = "cb_shoco_services", schema = "public", joinColumns = { @JoinColumn(name = "addr", nullable = false, updatable = false) }, inverseJoinColumns = { @JoinColumn(name = "service_id", nullable = false, updatable = false) })
     public Set<CbService> getCbServices() {
          return this.cbServices;
     }

     public void setCbServices(Set<CbService> cbServices) {
          this.cbServices = cbServices;
     }

generated from existng database - Seam Generate Entities

do I have to change something here ?

[tiagoemerick]

Hi guys.

sorry for revive an old topic, but i do not understand how this problem occurs in seam.

David THIBAU, you said that my attribute is associated with 2 Hibernate's sessions.
how it's possible when seam is managing my sessions?

David THIBAU wrote on Dec 15, 2008 14:45:


Your problem here is that your attribute is associated with 2 Hibernate's session !!

(perharps in 2 seam's component ?)

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