package calljunk;

import java.io.File;
import java.net.URL;
import java.net.URLClassLoader;

public class CallJunk {

   static String[] dum=new String[0];
   static Class[] parameterTypes = new Class[]{dum.getClass()};

   public static void main(String[] args)throws Exception {
      URL[] urls = new URL[]{
            new File("../junk/cglib-2.2_beta1.jar").toURL(),
            new File("../junk/commons-collections-2.1.1.jar").toURL(),
            new File("../junk/dom4j-1.6.1.jar").toURL(),
            new File("../junk/ehcache-1.2.jar").toURL(),
            new File("../junk/hibernate3.jar").toURL(),
            new File("../junk/jta.jar").toURL(),
            new File("../junk/postgresql-8.0-311.jdbc3.jar").toURL(),
            new File("../junk/commons-logging-1.0.4.jar").toURL(),
            new File("../junk/bin").toURL()
         };
      
      for (int i=0; i<1000; i++) {
         System.out.println("No "+i+": ");
         //System.in.read();
         Class cls = new URLClassLoader(urls).loadClass("junk.Junk");
         cls.getMethod("main", parameterTypes).invoke(null, new Object[]{dum});
      }
   }
}

package junk;
import java.beans.Introspector;

import org.hibernate.HibernateException;
import org.hibernate.Session;
import org.hibernate.SessionFactory;
import org.hibernate.cfg.Configuration;
import org.hibernate.cfg.Environment;

import javax.naming.InitialContext;

public class Junk {

    private static String CONFIG_FILE_LOCATION = "/hibernate.cfg.xml";

   public static void main(String[] args) throws Exception {
      Configuration cfg = new Configuration();
      SessionFactory sFactory = null;
      try {
         cfg.configure(CONFIG_FILE_LOCATION);
         String sessionFactoryJndiName = cfg.getProperty(Environment.SESSION_FACTORY_NAME);
         if (sessionFactoryJndiName != null) {
            cfg.buildSessionFactory();
            sFactory = (SessionFactory) (new InitialContext()).lookup(sessionFactoryJndiName);
         } else {
            sFactory = cfg.buildSessionFactory();
         }
      } catch (Exception e) {
         throw new HibernateException("Could not initialize the Hibernate configuration");
      }
       Session s = sFactory.getCurrentSession();
       s.close();
       Introspector.flushCaches();
       sFactory.close();
   }
   
}

<?xml version='1.0' encoding='utf-8'?>
<!DOCTYPE hibernate-configuration PUBLIC
   "-//Hibernate/Hibernate Configuration DTD//EN"
   "http://hibernate.sourceforge.net/hibernate-configuration-3.0.dtd">

<hibernate-configuration>
   <session-factory>
      <!--define query language constants / function names-->
      
      <property name="query.substitutions">no='N', true=1, yes='Y', false=0</property>
      
      <!--DB config-->
      <property name="dialect">org.hibernate.dialect.PostgreSQLDialect</property>
      <property name="connection.driver_class">org.postgresql.Driver</property>
      <property name="connection.username">postgres</property>
      <property name="connection.password"></property>
      <property name="connection.url">jdbc:postgresql://localhost:5432/db</property>

      <property name="hibernate.cglib.use_reflection_optimizer">false</property>
      <property name="connection.useUnicode">true</property>
      <property name="connection.characterEncoding">UTF-8</property>

      <!-- Print SQL to stdout. -->
      <property name="show_sql">true</property>

      <!-- connection pool -->
      <property name="dbcp.maxActive">100</property>
      <property name="dbcp.whenExhaustedAction">1</property>
      <property name="dbcp.maxWait">120000</property>
      <property name="dbcp.maxIdle">10</property>

      <!-- prepared satement cache -->
      <property name="dbcp.ps.maxActive">100</property>   
      <property name="dbcp.ps.whenExhaustedAction">1</property>   
      <property name="dbcp.ps.maxWait">120000</property>
      <property name="dbcp.ps.maxIdle">10</property>

      <!--use a custom ConnectionProvider-->
      <property name="current_session_context_class">thread</property>
<!--      <property name="hibernate.connection.provider_class">org.hibernate.connection.DBCPConnectionProvider</property>-->
<!--      <property name="hibernate.connection.provider_class">org.hibernate.connection.ConnectionProvider</property>-->
      <!--use streams when writing binary types to / from JDBC-->
      <property name="jdbc.use_streams_for_binary">true</property>
      <!--set the maximum depth of the outer join fetch tree-->
      <property name="max_fetch_depth">1</property>
      <!--set a prefix for cache region names-->

      <!--enable the query cache-->
      <property name="cache.use_query_cache">false</property>
      <!--a Second-level Cache implementation-->
      <property name="cache.provider_class">org.hibernate.cache.EhCacheProvider</property>
      <!--set the JDBC fetch size-->

      <property name="jdbc.fetch_size">50</property>

      <!--set the maximum JDBC 2 batch size-->

      <property name="jdbc.batch_size">100</property> 

      <!-- pkapp mapping files. -->
<!--
      <mapping resource="com/xiaodinglist/db/listrec.hbm.xml"/>
      <mapping resource="com/xiaodinglist/db/carlist.hbm.xml"/>
      <mapping resource="com/xiaodinglist/db/salelist.hbm.xml"/>
-->
   </session-factory>
</hibernate-configuration>