ManyToMany not persisting detached with 3.2.1 works in 3.2.0

youngm77 · **Joined:** Thu Aug 26, 2004 9:23 pm **Posts:** 71

I'm having a problem with ManyToMany merging with 3.2.1 that worked just fine in 3.2.0. I can literally switch out the 3.2.1 jar with 3.2.0 and see it work.

I have a many to many relationship between Animals and Countries. Animals is the owning side. If I modify the entries in Animals.countries and do a merge the countries are correctly merged and an animal with the correct countries is returned however no db modification sql is ever issued. Other modifications to the Animal entity are correctly persisted including a ManyToOne I have with on other entities but the changes to the ManyToMany are not persisted to the database. Any ideas? Below are the mappings.

Mike

Example.java //Some pseudo code that is giving the problem

Code:

  Animal animal = getADetachedAnimal();
  List<Country> countries = new ArrayList<Country>();
  countries.add(getACountry());
  animal.setCountries(countries);
  begin a transaction
  em.merge(animal);
  end a transaction

Animal.java

Code:

@Entity
@Cache(usage = CacheConcurrencyStrategy.TRANSACTIONAL)
@NamedQueries({
   @NamedQuery(name=Animal.QUERY_GET_ALL_ANIMALS_AS_SELECT_ITEMS, query="select new javax.faces.model.SelectItem(a, a.name) from Animal a")
})
@SuppressWarnings("serial")
public class Animal implements Serializable {
   public static final String QUERY_GET_ALL_ANIMALS_AS_SELECT_ITEMS = "getAllAnimalsAsSelectItems";

   @Id @GeneratedValue
   private Long id;
    private String name;
    @Enumerated(EnumType.STRING)
    private Gender gender;
    @Column(length=4000)
    private String description;
    private String imageUrl;
    private double price;
    private Date dateOfBirth;
    @ManyToOne
    @Basic(fetch=FetchType.LAZY)
    private Classification classification;
    @ManyToMany
    @JoinTable(name="ANIMAL_COUNTRY",
          joinColumns=@JoinColumn(name="ANIMAL_ID"),
          inverseJoinColumns=@JoinColumn(name="COUNTRY_ID"))
    @Cache(usage = CacheConcurrencyStrategy.TRANSACTIONAL)
    @Basic(fetch=FetchType.LAZY)
    private List<Country> countries;
    @SuppressWarnings("unused")
   @Version
    private Long version;

Country.java

Code:

@Entity
@Cache(usage = CacheConcurrencyStrategy.READ_ONLY)
@SuppressWarnings("serial")
public class Country implements Serializable {

   @Id @GeneratedValue @Column(updatable=false)
   private Long id; //NOPMD - wheelermm
   @Column(unique=true, nullable=false)
    public String name;
    @Basic(fetch=FetchType.LAZY)
    @ManyToMany(mappedBy="countries")
    @Cache(usage=CacheConcurrencyStrategy.TRANSACTIONAL)
    public List<Animal> animals;

youngm77 · **Joined:** Thu Aug 26, 2004 9:23 pm **Posts:** 71

youngm77 · **Joined:** Thu Aug 26, 2004 9:23 pm **Posts:** 71

After a little further investigation it appears to only happen when animal is detached.

So Here is some actual code that duplicates the problem. If I comment out the SerializationUtils.clone then everything works fine. In addition if I downgrade to 3.2.0 everything works fine. Also note that the animal name is updated but the collection is not so it is not a problem of the session not being flushed or something.

Mike

Code:

        //Start Transaction
   Animal animal = entityManager.find(Animal.class, 21l);
   animal = (Animal)SerializationUtils.clone(animal);
       List<Country> countries = new ArrayList<Country>();
       countries.add(countryService.findAllCountries().get(2));
       animal.setCountries(countries);
       animal.setName("AaaCountry1");
       entityManager.merge(animal);
        //Committ Transaction

youngm77 · **Joined:** Thu Aug 26, 2004 9:23 pm **Posts:** 71

Ok, I guess I'll try filing a bug.

youngm77 · **Joined:** Thu Aug 26, 2004 9:23 pm **Posts:** 71

http://opensource.atlassian.com/project ... e/HHH-2292

mheath · **Joined:** Tue Mar 01, 2005 6:58 pm **Posts:** 7

We're seeing the exact same problem. Is anything being done about this?

shailesh.mangal · **Posted:** Mon Oct 29, 2007 4:30 pm

any work around for this?