(hibernate4) org.hibernate.MappingException: Unknown entity

Question

I am a newbie to Java EE, please help!

The following code used struts2+hibernate4+oracle11g. After I run this code, it gives me this error message:

org.hibernate.MappingException: Unknown entity

UserDetails.java

import javax.persistence.Entity;
import javax.persistence.Id;
import javax.persistence.Table;

import org.hibernate.Session;
import org.hibernate.SessionFactory;
import org.hibernate.cfg.Configuration;
import org.hibernate.service.ServiceRegistry;
import org.hibernate.service.ServiceRegistryBuilder;

@Entity
@Table(name="users")
public class UserDetails {
    @Id
    private int id;
    private String passwd;
    public String getPasswd() {
        return passwd;
    }
    public void setPasswd(String passwd) {
        this.passwd = passwd;
    }
    public int getId() {
        return id;
    }
    public void setId(int id) {
        this.id = id;
    }

    public void Update(){
        SessionFactory sessionFactory;
        ServiceRegistry serviceRegistry;

        Configuration configuration = new Configuration();
        configuration.configure();
        serviceRegistry = new ServiceRegistryBuilder().applySettings(configuration.getProperties()).buildServiceRegistry();        
        sessionFactory = configuration.buildSessionFactory(serviceRegistry);

        Session session = sessionFactory.openSession();
        session.beginTransaction();
        session.save(this);
        session.getTransaction().commit();
    }
}

hibernate.cfg.xml

<?xml version='1.0' encoding='UTF-8'?>
<!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="dialect">org.hibernate.dialect.Oracle10gDialect</property>
    <property name="connection.driver_class">oracle.jdbc.OracleDriver</property>
    <property name="connection.url">jdbc:oracle:thin:@192.168.1.2:1521:orcl</property>
    <property name="connection.username">steve</property>
    <property name="connection.password">steve</property>

    <property name="cache.provider_class">org.hibernate.cache.HashtableCacheProvider</property>

    <property name="transaction.factory_class">org.hibernate.transaction.JDBCTransactionFactory</property>
    <property name="current_session_context_class">thread</property>
    <property name="hibernate.show_sql">true</property>
    <property name="hbm2ddl.auto">create</property>
  </session-factory>

</hibernate-configuration>

Table Structure:

Create table Users (ID int primary key, passwd varchar(45));

Mathias Schwarz · Accepted Answer · 2012-12-17 11:21:15Z

2

You need to add the class:

import javax.persistence.Entity;
import javax.persistence.Id;
import javax.persistence.Table;

import org.hibernate.Session;
import org.hibernate.SessionFactory;
import org.hibernate.cfg.Configuration;
import org.hibernate.service.ServiceRegistry;
import org.hibernate.service.ServiceRegistryBuilder;

@Entity
@Table(name="users")
public class UserDetails {
    @Id
    private int id;
    private String passwd;
    public String getPasswd() {
        return passwd;
    }
    public void setPasswd(String passwd) {
        this.passwd = passwd;
    }
    public int getId() {
        return id;
    }
    public void setId(int id) {
        this.id = id;
    }

    public void Update(){
        SessionFactory sessionFactory;
        ServiceRegistry serviceRegistry;

        Configuration configuration = new Configuration();
        configuration.addAnnotatedClass(UserDetails.class); //<-- Here, adds the class to the Hibernate configuration
        configuration.configure();
        serviceRegistry = new ServiceRegistryBuilder().applySettings(configuration.getProperties()).buildServiceRegistry();        
        sessionFactory = configuration.buildSessionFactory(serviceRegistry);

        Session session = sessionFactory.openSession();
        session.beginTransaction();
        session.save(this);
        session.getTransaction().commit();
    }
}

You definitely do not want to construct a new Hibernate Configuration and SessionFactory each time you want to save something to the table, so move the stuff from Update to an init method somewhere.

answered Dec 17, 2012 at 11:21

Mathias Schwarz

7,19725 silver badges28 bronze badges

Sign up to request clarification or add additional context in comments.

1 Comment

Popa Andrei Over a year ago

You can also add the entity in the hibernate configuration xml file in the <session-factory><mapping>class="your-entity"</mapping></sesion-factory>

Matin Kh · Accepted Answer · 2012-12-17 11:20:50Z

1

The problem is that you haven't defined your class to hiberante.

Inside your session-factory add these lines:

<property name="annotatedClasses">
    <list>
        <value>myPackage.UserDetails</value>
    </list>
</property>

answered Dec 17, 2012 at 11:20

Matin Kh

5,1986 gold badges58 silver badges81 bronze badges

Comments

Ekanath · Accepted Answer · 2012-12-17 11:51:01Z

1

Hibernate mapping for entity is missing. Alternatively you can use in your hibernate configuration file. and define the UserDetails.hbm.xml. I hope this will be helpfull.

answered Dec 17, 2012 at 11:51

Ekanath

1331 gold badge1 silver badge8 bronze badges

Collectives™ on Stack Overflow

(hibernate4) org.hibernate.MappingException: Unknown entity

3 Answers 3

1 Comment

Comments

Comments

Your Answer

Linked

Hot Network Questions

Collectives™ on Stack Overflow

3 Answers 3

1 Comment

Comments

Comments

Your Answer

Sign up or log in

Post as a guest

Linked

Related