J'ai créé une config Hibernate mais les entity ne sont pas reconnus

J'ai cette structure :

/

└── src

├── main

│ └── java

│ ├── dao

│ │ └── RealmDao.java

│ ├── entity

│ │ └── Realm.java

│ ├── util

│ │ └── HibernateUtil.java

│ └── main.java

└── resources

└── hibernate.cfg.xml

Voici le code des classes :

package dao;


import entity.Realm;
import jakarta.persistence.criteria.CriteriaBuilder;
import jakarta.persistence.criteria.CriteriaQuery;
import jakarta.persistence.criteria.Root;
import org.hibernate.*;
import util.HibernateUtil;

import java.util.List;
public class RealmDAO {

public void save(entity.Realm realm) {
Transaction tx = null;
try (Session session = HibernateUtil.getSessionFactory().openSession()) {
tx = session.beginTransaction();
session.persist(realm);
tx.commit();
} catch (Exception e) {
if (tx != null && tx.isActive()) {
try {
tx.rollback();
} catch (Exception rollbackEx) {
System.err.println("Rollback failed: " + rollbackEx.getMessage());
}
}
throw e;
}
}
}

package entity;

import javax.persistence.*;
import java.util.Set;

@Entity
@Table(name = "realm")
public class Realm {

@Id
private int id;

private String name;

@OneToMany(mappedBy = "realm", cascade = CascadeType.
ALL
, orphanRemoval = true)
private Set<Currency> currencies;

// Getters and setters
public int getId() { return id; }
public void setId(int id) { this.id = id; }

public String getName() { return name; }
public void setName(String name) { this.name = name; }

public Set<Currency> getCurrencies() { return currencies; }
public void setCurrencies(Set<Currency> currencies) { this.currencies = currencies; }
}

package util;


import entity.Currency;
import entity.Item;
import entity.Realm;
import org.hibernate.SessionFactory;
import org.hibernate.cfg.Configuration;

public class HibernateUtil {

private static final SessionFactory
sessionFactory
=
buildSessionFactory
();

private static SessionFactory buildSessionFactory() {
try {
return new Configuration()
.configure("hibernate.cfg.xml")
.addAnnotatedClass(Realm.class)
.buildSessionFactory();
} catch (Throwable ex) {
System.
err
.println("Initial SessionFactory creation failed: " + ex);
throw new ExceptionInInitializerError(ex);
}
}

public static SessionFactory getSessionFactory() {
return
sessionFactory
;
}

public static void shutdown() {

getSessionFactory
().close();
}
}




public Class Main {
public static void main(String[] args) {
System.
out
.println("Realm.class is entity? " + HibernateUtil.
getSessionFactory
().getMetamodel().entity(Realm.class));
}
}



hibernate.cfg.xml
<!DOCTYPE hibernate-configuration PUBLIC
"-//Hibernate/Hibernate Configuration DTD 3.0//EN"
"http://hibernate.sourceforge.net/hibernate-configuration-3.0.dtd">
<hibernate-configuration>
<session-factory>
<property name="hibernate.connection.driver_class">com.mysql.cj.jdbc.Driver</property>
<property name="hibernate.connection.url">jdbc:mysql://localhost:3306/database</property>
<property name="hibernate.connection.username">user</property>
<property name="hibernate.connection.password">password</property>
<property name="hibernate.hbm2ddl.auto">update</property>
<property name="hibernate.show_sql">true</property>
<property name="hibernate.format_sql">true</property>
<mapping class="entity.Realm"/>
</session-factory>
</hibernate-configuration>

Il n'y a pas d'erreur dans le projet.
Quand je lance la class main j'ai cette erreur

Exception in thread "main" java.lang.IllegalArgumentException: Not an entity: entity.Realm

at org.hibernate.metamodel.model.domain.internal.JpaMetamodelImpl.entity(JpaMetamodelImpl.java:204)

at org.hibernate.metamodel.model.domain.internal.MappingMetamodelImpl.entity(MappingMetamodelImpl.java:463)

at org.hibernate.metamodel.model.domain.internal.MappingMetamodelImpl.entity(MappingMetamodelImpl.java:98)

Je ne sais pas quoi faire.

Quelqu'un peut m'aider ?

Merci.