Hi,

I'm trying to audit an entity which contains a collection of components. I know that auditing @ElementCollection wasn't supported in previous version of hibernate (https://hibernate.atlassian.net/browse/HHH-6613), therefore I'm using version 4.2.0.Final.

My classes are:

@Entity
@Audited
@Table(name = "TEST_OWNER")
public class Owner {
          private Integer id;
          private String name;
          private Set<Owned> ownedSet;
  
          @Id
          @GeneratedValue(strategy=GenerationType.AUTO)
          @Column(name = "OWNER_ID")
          public Integer getId() {
                    return id;
          }
          public void setId(Integer id) {
                    this.id = id;
          }
  
          @Column(name = "OWNER_NAME")
          public String getName() {
                    return name;
          }
  
          public void setName(String name) {
                    this.name = name;
          }
  
          @ElementCollection
          @CollectionTable(name = "TEST_OWNER_PARAMS", joinColumns = @JoinColumn(name = "OWNER_ID"))
          public Set<Owned> getOwnedSet() {
                    return ownedSet;
          }
          public void setOwnedSet(Set<Owned> ownedSet) {
                    this.ownedSet = ownedSet;
          }
 
}
 

@Embeddable
public class Owned {
          private String param;
          private String val;
  
          public Owned() {
          }
  
          public Owned(String param, String val) {
                    super();
                    this.param = param;
                    this.val = val;
          }
 
 
          @Column(name = "PAR")
          public String getParam() {
                    return param;
          }
          public void setParam(String param) {
                    this.param = param;
          }
  
          @Column(name = "VAL")
          public String getVal() {
                    return val;
          }
          public void setVal(String val) {
                    this.val = val;
          }
  
          @Override
          public int hashCode() {
                    final int prime = 31;
                    int result = 1;
                    result = prime * result + ((param == null) ? 0 : param.hashCode());
                    result = prime * result + ((val == null) ? 0 : val.hashCode());
                    return result;
          }
  
          @Override
          public boolean equals(Object obj) {
                    if (this == obj)
                              return true;
                    if (obj == null)
                              return false;
                    if (!(obj instanceof Owned))
                              return false;
                    Owned other = (Owned) obj;
                    if (param == null) {
                              if (other.param != null)
                                        return false;
                    }
                    else if (!param.equals(other.param))
                              return false;
                    if (val == null) {
                              if (other.val != null)
                                        return false;
                    }
                    else if (!val.equals(other.val))
                              return false;
                    return true;
          }
}
 
 

Primary key for TEST_OWNER_PARAMS_AUD table is (OWNER_ID, PAR, VAL, REV, REVTYPE).

Save/update/merge succeeds when I perform it on an Owner entity with "ownedSet" which contains a single element. However, save/update/merge fails when "ownedSet" contains more than one element (in case of merge - when more than one element in "ownedSet" was modified). The error I'm getting is:

 org.hibernate.NonUniqueObjectException: a different object with the same identifier value was already associated with the session: [TEST_OWNER_PARAMS_AUD#{REV=DefaultRevisionEntity(id = 2277, revisionDate = May 7, 2013 2:08:27 PM), Owner_id=2276, REVTYPE=ADD}]

Why does it happen? Am I missing something?

Thanks,

Julia