import java.io.IOException;
import java.util.Calendar;

import org.hibernate.Session;
import org.hibernate.SessionFactory;
import org.hibernate.Transaction;
import org.hibernate.cfg.AnnotationConfiguration;


public class TestWorkingTime {

   public static void main(String[] args) {
      AnnotationConfiguration configuration = new AnnotationConfiguration();
      configuration.configure();
      SessionFactory sessionFactory = configuration.buildSessionFactory();
      Session session = sessionFactory.openSession();
      Transaction transaction = session.beginTransaction();
      for (int i=0; i<100; i++) {
         WorkingTime wt = new WorkingTime();
         wt.setDate(Calendar.getInstance().getTime());
         session.save(wt);
      }
      try {
         transaction.commit();
         System.in.read();
         session.close();
         sessionFactory.close();
      } catch (IOException e) {
         e.printStackTrace();
      }
   }

}

<?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">org.hsqldb.jdbcDriver</property>
        <property name="connection.url">jdbc:hsqldb:file:myhibdb</property>
        <property name="connection.username">sa</property>
        <property name="connection.password"></property>
       
        <!-- JDBC connection pool (use the built-in) -->
        <property name="connection.pool_size">1</property>

        <!-- SQL dialect -->
        <property name="dialect">org.hibernate.dialect.HSQLDialect</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">create</property>
       
        <property name="hibernate.format_sql">true</property>
       
        <!-- Auflistung der gemappten Klassen -->
        <mapping class="WorkingTime"/>
   

    </session-factory>

</hibernate-configuration>