<form action="servlet" method="POST">

            Seus dados aqui!!!!!!

            <input type="text" name="entrada">

 </form>

<?xml version='1.0' encoding='utf-8'?>

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<!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="connection.url">jdbc:postgresql://localhost/crud</property> <!-- BD Mane -->

        <property name="connection.driver_class">org.postgresql.Driver</property> <!-- DB Driver -->

        <property name="connection.username">postgres</property> <!-- DB User -->

        <property name="connection.password">123456</property> <!-- DB Password -->

        <property name="hibernate.dialect">org.hibernate.dialect.PostgreSQLDialect</property> <!-- DB Dialect -->

        <property name="show_sql">true</property> <!-- Show SQL in console -->

        <property name="format_sql">true</property> <!-- Show SQL formatted -->

    </session-factory>

</hibernate-configuration>

/*

 * To change this license header, choose License Headers in Project Properties.

 * To change this template file, choose Tools | Templates

 * and open the template in the editor.

 */

package utilidades;

import entidades.Tabela;

import org.hibernate.Session;

import org.hibernate.SessionFactory;

import org.hibernate.cfg.AnnotationConfiguration;

public class HibernateUtil {

//    private static final SessionFactory sessionFactory;

//    static {

//        try {

//            sessionFactory = new AnnotationConfiguration()

//                    .configure().buildSessionFactory();

//        } catch (Throwable ex) {

//            // Log exception!

//            throw new ExceptionInInitializerError(ex);

//        }

//    }

//

//    public static Session getSession()

//            throws HibernateException {

//        return sessionFactory.openSession();

//    }

    private static SessionFactory factory;

    static {

        AnnotationConfiguration cfg = new AnnotationConfiguration();

        cfg.configure();

        cfg.addAnnotatedClass(Tabela.class);

        factory = cfg.buildSessionFactory();

    }

    public static Session getSession() {

        return factory.openSession();

    }

}

Session sessionRecheio;

sessionRecheio = HibernateUtil.getSession();

Transaction tr = sessionRecheio.beginTransaction();

sessionRecheio.saveOrUpdate(usuario);

tr.commit();