Hibernate Maven MappingException Unknown entity

Question

I got an exception when I use hibernate in Maven. The hibernate version is 5.1.0.Final. The exception is: Here is my project structure:

Here is my Entity class ABC:

package com;
import javax.persistence.*;
@Entity

@Table(name = "abc_inf")

public class ABC {

    @Id@GeneratedValue
    private Integer id;

    private String name;

    public ABC() {
    }

    setters and getters omitted 

}

Here is my main class:

package com;

import org.hibernate.Session;
import org.hibernate.SessionFactory;
import org.hibernate.boot.registry.StandardServiceRegistryBuilder;
import org.hibernate.cfg.Configuration;
import org.hibernate.service.ServiceRegistry;
public class Main {
    public static void main(String[] args) {
        Configuration conf = new Configuration().configure();
        ServiceRegistry sr = new             StandardServiceRegistryBuilder().applySettings(conf.getProperties()).build();
        SessionFactory sf = conf.buildSessionFactory(sr);
        Session session = sf.openSession();

        ABC abc = new ABC();
        abc.setName("abc");

        session.save(abc);
        session.flush();
        session.close();
        sf.close();
    }
}

Here is my hibernate.cfg.xml:

<hibernate-configuration>
  <session-factory>
    mysql connection and properties settings omitted
    <mapping class="com.ABC"/>
  </session-factory>
</hibernate-configuration>

Answer 1

It is a Hibernate 5 configuration problem. You can't use this code to build a session factory

Configuration conf = new Configuration().configure();
ServiceRegistry sr = new StandardServiceRegistryBuilder().applySettings(conf.getProperties()).build();
SessionFactory sf = conf.buildSessionFactory(sr);

Use this instead

SessionFactory sf = new Configuration().configure().buildSessionFactory();

Refer for additional notes

Hibernate 5 :- org.hibernate.MappingException: Unknown entity

Answer 2

如果使用Hibernate version 4，问题就解决了

Answer 3

You need to add the annotated classes to the hibernate config. Use the following code

AnnotationConfiguration conf = new AnnotationConfiguration();
conf.addAnnotatedClass(ABC.class);
SessionFactry sf = conf.configure(hbmFile).buildSessionFactory();

Answer 4

As for my case i'm use LocalSessionFactoryBean and setPackagesToScan , and services, writed for audit entities work fine.

But!!!

In our project we have table EntityInfo with column entityname , for example,

entytyname = bel.rdigital.cashbox.models.cbmain.merchantcore.versions.CBVersions

and this persist in db. Then I refactored entity CBVersions and transfer it to package

bel.rdigital.cashbox.models.cbmain.versions.cashbox.CBVersions ,

but in db stayed old package, and than, when I using method CrossTypeRevisionChangesReader.findEntitiesGroupByRevisionType(revision) ,

I get exception Unknown entity: bel.rdigital.cashbox.models.cbmain.merchantcore.versions.CBVersions

So, this exaption means, that hiberante not find entity... Problem may be in package scanning or in location entity...