MappedSuperclass inheritance does not work properly with duplicate persistent
field names
-----------------------------------------------------------------------------------------
Key: OPENJPA-791
URL: https://issues.apache.org/jira/browse/OPENJPA-791
Project: OpenJPA
Issue Type: Bug
Components: jpa
Affects Versions: 2.0.0
Reporter: Jeremy Bauer
An inheritance hierarchy which uses MappedSuperclass does not behave as
expected when duplicate persistent field names are in the hierarchy. (No
AttributeOverride is defined.) The mapping tool creates a table which contains
a single column of the duplicate name. When an entity is persisted, only one
field value is provided in the update and querying the entity results in one of
the fields being null.
Code to reproduce the problem:
@Entity
public class SubCls extends MSuperCls {
@Id
private int id;
public void setId(int id) {
this.id = id;
}
public int getId() {
return id;
}
}
@MappedSuperclass
public class MSuperCls extends M2SuperCls {
@Basic
private String name;
public void setM1Name(String name) {
this.name = name;
}
public String getM1Name() {
return name;
}
}
@MappedSuperclass
public class M2SuperCls {
@Basic
private String name;
public void setM2Name(String name) {
this.name = name;
}
public String getM2Name() {
return name;
}
}
SubCls subcls = new SubCls();
int id = new Random().nextInt();
subcls.setId(id);
subcls.setM1Name("M1Name");
subcls.setM2Name("M2Name");
em.getTransaction().begin();
em.persist(subcls);
em.getTransaction().commit();
em clear();
SubCls subcls2 = em.find(SubCls.class, id);
System.out.println("id: " + subcls2.getId());
System.out.println("m1: " + subcls2.getM1Name());
System.out.println("m2: " + subcls2.getM2Name());
Results in:
id: -1632111518
m1: M1Name
m2: null
The JPA spec does not appear to prescribe a means for dealing with this
condition, via issuing exception or a default naming scheme which handles
duplicate persistence names. The assumption appears to be that an
AttributeOverride should be specified to handle this condition, but since
AttributeOverride must be specified on the entity, it only works for a single
instance override of a duplicate name. Given the intent of AttributeOverride,
it appears that the appropriate course of action is for OpenJPA to detect the
duplicate names in the hierarchy and throw an appropriate exception.
--
This message is automatically generated by JIRA.
-
You can reply to this email to add a comment to the issue online.
