I'm trying to work through Beginning Hibernate 2nd edition, and I'm stuck trying to put together the simple working example with HSQLDB.

When I run ant populateMessages, I get

[java] org.hibernate.MappingException: Unknown entity: sample.entity.Message
[java]     at org.apache.tools.ant.taskdefs.ExecuteJava.execute(ExecuteJava.java:194)
[java]     at org.apache.tools.ant.taskdefs.Java.run(Java.java:747)
...

Here's what I've got:

Message.java

package sample.entity;

import org.hibernate.annotations.Entity;

import javax.persistence.GeneratedValue;
import javax.persistence.Id;
import javax.persistence.Table;

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

    public Message( String messageText )
    {
        this.messageText = messageText;
    }

    public Message()
    {
    }

    public String getMessageText()
    {
        return messageText;
    }

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

    @Id
    @GeneratedValue
    public Integer getId()
    {
        return id;
    }

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

PopulateMessages.java

package sample;

import org.hibernate.Session;
import org.hibernate.SessionFactory;
import org.hibernate.cfg.AnnotationConfiguration;
import org.hibernate.cfg.Configuration;
import sample.entity.Message;

import java.util.Date;

public class PopulateMessages
{
    public static void main(String[] args)
    {
        SessionFactory factory = new AnnotationConfiguration().configure().buildSessionFactory();
        Session session = factory.openSession();
        session.beginTransaction();

        Message m1 = new Message("Hibernated a  messages on " + new Date());
        session.save(m1);
        session.getTransaction().commit();
        session.clos
java hibernate annotations
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