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Getting org.hibernate.id.IdentifierGenerationException for OneToMany mapping


Getting org.hibernate.id.IdentifierGenerationException for OneToMany mapping

By : Alvin Adams
Date : November 18 2020, 11:13 AM
hope this fix your issue I am getting the following error while trying to save Project Object: , you have not mentioned AutoGeneration strategy for @Id, like :
code :
@Id
@GeneratedValue(strategy=GenerationType.AUTO)


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Hibernate onetomany mapping

Hibernate onetomany mapping


By : user2278364
Date : March 29 2020, 07:55 AM
help you fix your problem There are several things to fix in your mapping.
Your association is bidirectional, you need to use the mappedBy attribute on the "One" side (or what you'll get is two unidirectional associations) to define the field that "owns" the relation on the owning side (the side that holds the foreign key i.e. the Many side in a one-to-many). The @JoinColumn annotation should be defined on the owning side only, not both sides. If you are using a JPA 2.0 compliant version of Hibernate (i.e. Hibernate 3.5+), prefer the standard @OrderColumn annotation of the Hibernate specific @IndexColumn I'm not sure to understand why you defined the @JoinColumn as totally read-only with updatable = false, insertable = false, nullable=false, this doesn't sound appropriate.
code :
@Entity
public class Project {
    @Id
    @GeneratedValue(strategy = GenerationType.IDENTITY)
    private int id;

    @OneToMany(cascade = CascadeType.ALL, mappedBy="project")
    @OrderColumn(name = "project_index")
    List<Application> applications = new ArrayList<Application>();

    // getters, setters
}
@Entity
public class Application {

    @Id
    @GeneratedValue(strategy = GenerationType.IDENTITY)
    private int id;

    @ManyToOne
    @JoinColumn(name = "project_id")
    private Project project;

    // getters, setters
 }
Project p = new Project();
Application a = new Application();
a.setProject(p);
p.getApplications().add(a);
em.persist(p);
@Entity
public class Project {
    ...
    public void addToApplications(Application app) {
        this.applications.add(app);
        app.setProject(this);
    }
    ...
}
JPA, Hibernate, OneToMany mapping

JPA, Hibernate, OneToMany mapping


By : ming
Date : March 29 2020, 07:55 AM
I wish this helpful for you you add the @Id annotation on the 3 attributes.
If your entity is more than a relation table (it holds additional attributes) I would advise to use an EmbeddedId instead
In Hibernate OneToMany mapping

In Hibernate OneToMany mapping


By : keep
Date : March 29 2020, 07:55 AM
wish of those help If the relationship is bidirectional, the mappedBy element must be used to specify the relationship field or property of the entity that is the owner of the relationship.
org.hibernate.id.IdentifierGenerationException: while saving data in one to one mapping

org.hibernate.id.IdentifierGenerationException: while saving data in one to one mapping


By : Venerable Simpatico
Date : March 29 2020, 07:55 AM
around this issue The stacktrace you posted is not the same that originated IdentifierGenerationException. The stacktrace posted means that someone is locking a database table to which your transaction wants to write.
If this is a development database, most probably it's a SQL GUI client like My SQL workbench that has a transaction opened that is not yet committed. It can also a process that you thought you killed that is still around.
code :
page.setAtom(atom);
atom.setPage(page);
Hibernate Mapping OneToMany + inheritance

Hibernate Mapping OneToMany + inheritance


By : Darko Zivic
Date : March 29 2020, 07:55 AM
like below fixes the issue I'm asking to know the best way to map between my orders and requests. The Order class is: , First make an interface for Request
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