[LazyInitializationException] failed to lazily initialize a collection of role

[Sahli Sabrina]

Hi everyOne,
when i try to get a list of object in "Societe" class 


i'm getting this exception
 

LazyInitializationException] failed to lazily initialize a collection of role: com.protid.prosa.shared.model.bo.Commune.soumission, no session or session was closed
[INFO] org.hibernate.LazyInitializationException: failed to lazily initialize a collection of role: com.protid.prosa.shared.model.bo.Commune.soumission, no session or session was closed

Notice that the class Societe have an attribute of type Adresse. the adresse has an attribute Commune . A set of "Soumission" are declared in Commune class by the annotation OneToMany like this

@OneToMany(fetch = FetchType.LAZY, mappedBy="commune",targetEntity=com.protid.prosa.shared.model.bo.Soumission.class)
@Cascade(value = {CascadeType.ALL })
private Set<Soumission> soumission =new HashSet<Soumission>();

public Set<Soumission> getSoumission(){
    return soumission;
}
 
}

i don't get where is the problem because i'm not looking  for the "soumission " objects in the Commune class !!!


here is my rpc cal function

private void getCompany(){
       
        SocieteServiceAsync rpc=clientFactory.getSocieteservicerpc();
          
 
        AsyncCallback<List<Societe>> callback = new AsyncCallback<List<Societe>>() {           
            public void onFailure(Throwable caught) {
                       
                       }
                     
                     
                    public void onSuccess(List<Societe> result) {
                         
                          if(result!=null){
                              societe=result.get(0);
                               result.get(0).getNomsociete();
                       
                          }
                    
                    }
                    };
                   
                rpc.list(callback);
 
                    
    }

Please help,

Thank you

[Juan Pablo Gardella]

If you don't want use DTO pattern to transfer objects to UI, check this thread. I've implemented a filter that you can use to put null lazy relationships.

The problem is very common in Hibernate, check in google. It happens when you serialize the object with GWT-RPC.

2013/6/11 Sahli Sabrina <sahli....@gmail.com>

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[Sahli Sabrina]

[Sahli Sabrina]

i  did'nt find the filter in your code . can you explain me please how did you do?

thank you

2013/6/11 Sahli Sabrina <sahli....@gmail.com>

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[Juan Pablo Gardella]

The filter is: https://bitbucket.org/gardellajuanpablo/gwt-sample/src/8aba86d82778cb3a6f48f4d5f60f21d4134282b4/src/main/java/com/foo/server/rpc/hibernate/HibernateFilter.java?at=default

2013/6/11 Sahli Sabrina <sahli....@gmail.com>

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[Sahli Sabrina]

Thank you a lot , can you explain me please how it works and how to use it? because  i don"nt use gin so i can't make the difference in code

2013/6/11 Sahli Sabrina <sahli....@gmail.com>

2013/6/11 Sahli Sabrina <sahli....@gmail.com>

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[Juan Pablo Gardella]

See: http://books.google.com.ar/books?id=OG816JSZYVcC&pg=PA159&lpg=PA159&dq=hibernate+filter+gwt&source=bl&ots=BM7BGKs_n6&sig=CXd4NoOk_Wu-_ixtoZhljgr0V8A&hl=es&sa=X&ei=eD63UfrXAcL84AOFm4HYBA&ved=0CEUQ6AEwAg#v=onepage&q=hibernate%20filter%20gwt&f=false

This where I pick the idea and the implementation.

And you can see alternatives here: https://developers.google.com/web-toolkit/articles/using_gwt_with_hibernate

I prefer DTO + Dozzer.

Juan

2013/6/11 Sahli Sabrina <sahli....@gmail.com>

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[Sahli Sabrina]

OK thank you :) , actually i resolved the problem by creating an extension of the service in wish i override the function list like this

    public List<Societe> list() throws ServiceException {
         List<Societe> list = new ArrayList<Societe>();
         List<Societe>    societes=new ArrayList<Societe>();
            log.debug("debut de la recherche des objets    Societe ");
            try {
                 list = getSocieteDao().list();
 
           
            if(list!=null){
                for(Societe societe :list){
                Societe s=new Societe();
                s.setNomsociete(societe.getNomsociete());
                societes.add(s);
                }
            }
                log.debug("fin de recherche des objets Societe ");
            } catch (Exception re) {
                log.error("erreur de recherche ", re);
                throw new ServiceException(
                        "error lors de la recherche de l'objet Societe : "
                                + re.toString());
            }
            return societes;
     }
    

but i will use dto , i think it is better


thank you again