Hibernate and extra insert

[Marco Tulio Borges]

I have a problem with Hibernate (Annotations). Here are my Entities:

package xpto;
 
imports...
 
@Entity
@Table(name = "Table1")
public class Entity1 implements Serializable, Cloneable {
 
private static final long serialVersionUID = -631802366459387352L;
private Integer id;
private Integer version;
private AnotherEntity1 ae1;
private AnotherEntity2 ae2;
private Set<AnotherEntity3> aeSet;
 
@Id
@GeneratedValue(strategy = GenerationType.IDENTITY)
@Column(name = "NUMG_E1", nullable = false)
public Integer getId() {
return id;
}
 
public void setId(Integer id) {
this.id = id;
}
 
@Version
@Column(name = "NUMR_Version", nullable = false)
public Integer getVersion() {
return version;
}
 
public void setVersion(Integer version) {
this.version = version;
}
 
@OneToOne
@JoinColumn(name = "NUMG_AE1", nullable = true)
public AnotherEntity1 getAe1() {
return ae1;
}
 
public void setAe1(AnotherEntity1 ae1) {
this.ae1 = ae1;
}
 
@OneToOne
@JoinColumn(name = "NUMG_AE2", nullable = true)
public AnotherEntity2 getAe2() {
return ae2;
}
 
public void setAe2(AnotherEntity1 ae2) {
this.ae2 = ae2;
}
 
@OneToMany(fetch = FetchType.LAZY)
@JoinTable(name = "col3", joinColumns = { @JoinColumn(name = "NUMG_E1") }, inverseJoinColumns = @JoinColumn(name = "NUMG_AE3"))
public Set<AnotherEntity3> getAeSet() {
if (aeSet == null) {
aeSet = new HashSet<AnotherEntity3>();
 
}
 
return aeSet;
}
 
public void setAeSet(Set<AnotherEntity3> set) {
this.aeSet = set;
}
 
}
 

This one works just fine. The other one that does not is here:

package xpto;
 
imports...
 
@Entity
@Table(name = "Table2")
public class ProblemEntity implements Serializable, Cloneable {
 
private static final long serialVersionUID = 43180298745938651L;
private Integer id;
private Integer version;
        private java.util.Date date;
private Entity1 e1;
 
@Id
@GeneratedValue(strategy = GenerationType.IDENTITY)
@Column(name = "NUMG_E2", nullable = false)
public Integer getId() {
return id;
}
 
public void setId(Integer id) {
this.id = id;
}
 
@Version
@Column(name = "NUMR_Version", nullable = false)
public Integer getVersion() {
return version;
}
 
public void setVersion(Integer version) {
this.version = version;
}
 
@Temporal(TemporalType.TIMESTAMP)
@Column(name = "DATE_myDate", nullable = false)
public java.util.Date getDate() {
return date;
}
 
public void setDate(java.util.Date date) {
this.date = date;
}
 
@ManyToOne(fetch = FetchType.LAZY)
@JoinColumn(name = "NUMG_E1", nullable = false)
public Entity1 getE1() {
return e1;
}
 
public void setE1(Entity1 e1) {
this.e1 = e1;
}
}

Now, the problem: before I persist ProblemEntity, I call:

Entity1 e1 = (Entity1) session.get(Entity1.class, entity1Id);
problemEntity.setE1(e1);

After this code, I try to save my ProblemEntity and then flush the session object (the same session that retrieved e1). Even though e1 is not transient and has a valid ID (I checked it), Hibernate tries to insert both problemEntity and e1 (in this order). What am I doing wrong? (both classes are mapped in hibernate.cfg.xml)
[ May 21, 2008: Message edited by: Marco Tulio Borges ]

[Stevi Deter]

Marco,

It looks like you need to pick which side of the association is the owner, and on the annotation for the other side, include the mappedBy attribute on the inverse side. This will let the owning side of the association manage the relationship, and tell the inverse side it is not responsible for maintaining that relationship.