package sample.entity;

import java.io.Serializable;
import javax.persistence.Entity;
import javax.persistence.Id;
import javax.persistence.GeneratedValue;

@Entity
public class Message implements Serializable {
  private String messageText;
  private Integer id;

  public Message(){}
  public Message(String messageText) {
    this.messageText = messageText;
  }
 
  @Id
  @GeneratedValue
  public Integer getId() {
    return id;
  }

  public void setId(Integer id) {
    this.id = id;
  }

  public String getMessageText() {
    return messageText;
  }

  public void setMessageText(String messageText) {
    this.messageText = messageText;
  }


}

package sample;

import java.util.Date;
import sample.entity.Message;
import org.hibernate.Session;
import org.hibernate.SessionFactory;
import org.hibernate.cfg.AnnotationConfiguration;
public class PopulateMessage {
  public static void main(String[] args) {
    SessionFactory sessionFactory = new AnnotationConfiguration().configure().buildSessionFactory();
    Session session = sessionFactory.openSession();
    session.beginTransaction();

    Message m1 = new Message("Hibernated message on "+new Date());
    session.save(m1);
    session.getTransaction().commit();
    session.close();
  }
}

<?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 name="session1">
    <property name="hibernate.dialect">org.hibernate.dialect.MySQLDialect</property>
    <property name="hibernate.connection.driver_class">com.mysql.jdbc.Driver</property>
    <property name="hibernate.connection.url">jdbc:mysql://localhost:3306/hibernateSample</property>
    <property name="hibernate.connection.username">root</property>
    <property name="hibernate.connection.password">root</property>
    <property name="hibernate.show_sql">true</property>
    <property name="hibernate.current_session_context_class">thread</property>
  </session-factory>
</hibernate-configuration>

Sep 9, 2010 9:45:23 AM org.hibernate.cfg.annotations.Version <clinit>
INFO: Hibernate Annotations 3.5.5-Final
Sep 9, 2010 9:45:23 AM org.hibernate.cfg.Environment <clinit>
INFO: Hibernate 3.5.5-Final
Sep 9, 2010 9:45:23 AM org.hibernate.cfg.Environment <clinit>
INFO: hibernate.properties not found
Sep 9, 2010 9:45:23 AM org.hibernate.cfg.Environment buildBytecodeProvider
INFO: Bytecode provider name : javassist
Sep 9, 2010 9:45:23 AM org.hibernate.cfg.Environment <clinit>
INFO: using JDK 1.4 java.sql.Timestamp handling
Sep 9, 2010 9:45:24 AM org.hibernate.annotations.common.Version <clinit>
INFO: Hibernate Commons Annotations 3.2.0.Final
Sep 9, 2010 9:45:24 AM org.hibernate.cfg.Configuration configure
INFO: configuring from resource: /hibernate.cfg.xml
Sep 9, 2010 9:45:24 AM org.hibernate.cfg.Configuration getConfigurationInputStream
INFO: Configuration resource: /hibernate.cfg.xml
Sep 9, 2010 9:45:24 AM org.hibernate.cfg.Configuration addResource
INFO: Reading mappings from resource : Event.hbm.xml
Sep 9, 2010 9:45:24 AM org.hibernate.cfg.Configuration doConfigure
INFO: Configured SessionFactory: null
Exception in thread "main" java.lang.ClassFormatError: Absent Code attribute in method that is not native or abstract in class file javax/validation/Validation
        at java.lang.ClassLoader.defineClass1(Native Method)
        at java.lang.ClassLoader.defineClass(ClassLoader.java:621)
        at java.security.SecureClassLoader.defineClass(SecureClassLoader.java:124)
        at java.net.URLClassLoader.defineClass(URLClassLoader.java:260)
        at java.net.URLClassLoader.access$000(URLClassLoader.java:56)
        at java.net.URLClassLoader$1.run(URLClassLoader.java:195)
        at java.security.AccessController.doPrivileged(Native Method)
        at java.net.URLClassLoader.findClass(URLClassLoader.java:188)
        at java.lang.ClassLoader.loadClass(ClassLoader.java:307)
        at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:301)
        at java.lang.ClassLoader.loadClass(ClassLoader.java:252)
        at java.lang.ClassLoader.loadClassInternal(ClassLoader.java:320)
        at java.lang.Class.forName0(Native Method)
        at java.lang.Class.forName(Class.java:247)
        at org.hibernate.util.ReflectHelper.classForName(ReflectHelper.java:170)
        at org.hibernate.cfg.beanvalidation.BeanValidationActivator.activateBeanValidation(BeanValidationActivator.java:34)
        at org.hibernate.cfg.AnnotationConfiguration.enableBeanValidation(AnnotationConfiguration.java:1034)
        at org.hibernate.cfg.AnnotationConfiguration.buildSessionFactory(AnnotationConfiguration.java:952)
        at sample.PopulateMessage.main(PopulateMessage.java:10)
Java Result: 1