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Re: [eclipselink-users] Table per class inheritance problem
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Could be a bug, although the model you have provided below seems valid.
Is this model actually causing the exception or is there more to it? Any
XML? Out of curiosity what happens if the parent class is not abstract?
Cheers,
Guy
On 22/04/2010 1:43 PM, Davide Gesino wrote:
Migrating my application from hibernate I get an error.
It is a bug or an expected behavior?
In the end of the message you'll find the stack trace.
Here is the scenario:
I use a table per class inheritance hierarchy, and the ID is contained in
the abstract class, that is the father to all my entities.
consider I have something like:
#####################
## First class
#####################
@Entity
@Inheritance(strategy=InheritanceType.TABLE_PER_CLASS)
public abstract class SchoolStuff {
@Id
@GeneratedValue(strategy = GenerationType.SEQUENCE)
@Column(name = "ID")
protected long id;
public long getId() {
return id;
}
private void setId(long id) {
this.id = id;
}
}
######################
## second class
######################
@Entity
public class ClassRoom extends SchoolStuff {
@OneToMany(mappedBy="classroom",
cascade=CascadeType.ALL,
fetch = FetchType.LAZY)
private List<Student> studentList = new ArrayList<Student>();
public List<Student> getStudentList() {
return studentList;
}
public void setStudentList(List<Student> studentList) {
this.studentList = studentList;
}
private String classRoomName;
public void setClassRoomName(String classRoomName) {
this.classRoomName = classRoomName;
}
public String getClassRoomName() {
return classRoomName;
}
}
#######################
## third class
#######################
@Entity
public class Student extends SchoolStuff {
@ManyToOne(fetch= FetchType.LAZY)
@JoinColumn(name="CLASS_ROOM_ID",referencedColumnName="ID"
,nullable=false,updatable=true)
private ClassRoom classroom = null;
public ClassRoom getClassroom() {
return classroom;
}
public void setClassroom(ClassRoom classroom) {
this.classroom = classroom;
}
private String name;
public void setName(String name) {
this.name = name;
}
public String getName() {
return name;
}
}
I get the stack trace:
Local Exception Stack:
Exception [EclipseLink-30005] (Eclipse Persistence Services -
2.1.0.v20100311-r6779):
org.eclipse.persistence.exceptions.PersistenceUnitLoadingException
Exception Description: An exception was thrown while searching for
persistence archives with ClassLoader:
sun.misc.Launcher$AppClassLoader@a39137
Internal Exception: javax.persistence.PersistenceException: Exception
[EclipseLink-28018] (Eclipse Persistence Services - 2.1.0.v20100311-r6779):
org.eclipse.persistence.exceptions.EntityManagerSetupException
Exception Description: Predeployment of PersistenceUnit [SIRIUS_PU] failed.
Internal Exception: Exception [EclipseLink-7161] (Eclipse Persistence
Services - 2.1.0.v20100311-r6779):
org.eclipse.persistence.exceptions.ValidationException
Exception Description: Entity class [class
com.marconi.fusion.db.jpa.impl.Student] has no primary key specified. It
should define either an @Id, @EmbeddedId or an @IdClass. If you have defined
PK using any of these annotations then make sure that you do not have mixed
access-type (both fields and properties annotated) in your entity class
hierarchy.
...
