I've got a really simple class...
import javax.persistence.Column;
import javax.persistence.Entity;
import javax.persistence.GeneratedValue;
import javax.persistence.GenerationType;
import javax.persistence.Id;
import javax.persistence.Table;
@Entity
@Table(name = "users")
public class User {
@Column(name = "firstName")
private String firstName;
@Column(name = "lastName")
private String lastName;
@Column(name = "email")
private String email;
@Id
@GeneratedValue(strategy=GenerationType.AUTO)
@Column(name = "id")
private long id;
public String getFirstName() {
return firstName;
}
public void setFirstName(String firstName) {
this.firstName = firstName;
}
public String getLastName() {
return lastName;
}
public void setLastName(String lastName) {
this.lastName = lastName;
}
public String getEmail() {
return email;
}
public void setEmail(String email) {
this.email = email;
}
public long getId() {
return id;
}
public void setId(long id) {
this.id = id;
}
}
I call it using...
public class Main {
/**
* @param args
*/
public static void main(String[] args) {
// TODO Auto-generated method stub
HibernateUtil.buildSessionFactory();
Session session = HibernateUtil.getSessionFactory().getCurrentSession();
session.beginTransaction();
User u = new User();
u.setEmail("
[email protected]");
u.setFirstName("David");
u.setLastName("Gray");
session.save(u);
session.getTransaction().commit();
System.out.println("Record committed");
session.close();
}
}
I keep getting...
Exception in thread "main"
org.hibernate.MappingException: Unknown entity:
org.assessme.com.entity.User
at
org.hibernate.internal.SessionFactoryImpl.getEntityPersister(SessionFactoryImpl.java:1172)
at
org.hibernate.internal.SessionImpl.getEntityPersister(SessionImpl.java:1316)
at
org.hibernate.event.internal.AbstractSaveEventListener.saveWithGeneratedId(AbstractSaveEventListener.java:117)
at
org.hibernate.event.internal.DefaultSaveOrUpdateEventListener.saveWithGeneratedOrRequestedId(DefaultSaveOrUpdateEventListener.java:204)
at
org.hibernate.event.internal.DefaultSaveEventListener.saveWithGeneratedOrRequestedId(DefaultSaveEventListener.java:55)
at
org.hibernate.event.internal.DefaultSaveOrUpdateEventListener.entityIsTransient(DefaultSaveOrUpdateEventListener.java:189)
at
org.hibernate.event.internal.DefaultSaveEventListener.performSaveOrUpdate(DefaultSaveEventListener.java:49)
at
org.hibernate.event.internal.DefaultSaveOrUpdateEventListener.onSaveOrUpdate(DefaultSaveOrUpdateEventListener.java:90)
at
org.hibernate.internal.SessionImpl.fireSave(SessionImpl.java:670)
at
org.hibernate.internal.SessionImpl.save(SessionImpl.java:662)
at
org.hibernate.internal.SessionImpl.save(SessionImpl.java:658)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:601)
at
org.hibernate.context.internal.ThreadLocalSessionContext$TransactionProtectionWrapper.invoke(ThreadLocalSessionContext.java:352)
at $Proxy4.save(Unknown Source)
at Main.main(Main.java:20)
hibernateUtil is...
import
org.hibernate.SessionFactory;
import
org.hibernate.cfg.Configuration;
import
org.hibernate.service.ServiceRegistry;
import
org.hibernate.service.ServiceRegistryBuilder;
public class HibernateUtil {
private static SessionFactory sessionFactory;
private static ServiceRegistry serviceRegistry;
public static SessionFactory buildSessionFactory() {
try {
// Create the SessionFactory from hibernate.cfg.xml
Configuration configuration = new Configuration();
configuration.configure();
serviceRegistry = new ServiceRegistryBuilder().applySettings(configuration.getProperties()).buildServiceRegistry();
return new Configuration().configure().buildSessionFactory(serviceRegistry);
} catch (Throwable ex) {
// Make sure you log the exception, as it might be swallowed
System.err.println("Initial SessionFactory creation failed." + ex);
throw new ExceptionInInitializerError(ex);
}
}
public static SessionFactory getSessionFactory() {
sessionFactory = new Configuration().configure().buildSessionFactory(serviceRegistry);
return sessionFactory;
}
}
does anyone have any ideas as I've looked at so many duplicates but the resolutions don't appear to work for me.
hibernate.cfg.xml shown below...
<?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>
<!-- Database connection settings -->
<property name="connection.driver_class">com.mysql.jdbc.Driver</property>
<property name="connection.url">jdbc:mysql://localhost/ssme</property>
<property name="connection.username">root</property>
<property name="connection.password">mypassword</property>
<!-- JDBC connection pool (use the built-in) -->
<property name="connection.pool_size">1</property>
<!-- SQL dialect -->
<property name="dialect">org.hibernate.dialect.MySQLDialect</property>
<!-- Enable Hibernate's automatic session context management -->
<property name="current_session_context_class">thread</property>
<!-- Disable the second-level cache -->
<property name="cache.provider_class">org.hibernate.cache.NoCacheProvider</property>
<!-- Echo all executed SQL to stdout -->
<property name="show_sql">true</property>
<!-- Drop and re-create the database schema on startup -->
<property name="hbm2ddl.auto">update</property>
</session-factory>
</hibernate-configuration>
