Memory leak with Hibernate as JPA provider JSE

[Marcus Didius Falco]

Hallo, I am trying to use Hibernate (hibernate-distribution-3.3.2.GA, hibernate-annotations-3.4.0.GA, hibernate-entitymanager-3.4.0.GA) in an JSE application as JPA provider.
I get a memory leak. Heap dump analysis shows that
SessionFactoryObjectFactory is the culprit.

The class "org.hibernate.impl.SessionFactoryObjectFactory", loaded by "<system class loader>", occupies 14.707.104 (94,73%) bytes. The memory is accumulated in one instance of "java.util.HashMap$Entry[]" loaded by "<system class loader>". 

Any ideas what may be the cause of this are greatly appreciated.

 <?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>
	<property name="connection.url">jdbc:postgresql://localhost/bafoeg3</property>
	<property name="connection.username">postgres</property>
	<property name="connection.driver_class">org.postgresql.Driver</property>
	<property name="dialect">org.hibernate.dialect.PostgreSQLDialect</property>
	<property name="connection.password">danet123</property>
 <property name="transaction.factory_class">org.hibernate.transaction.JDBCTransactionFactory</property>
    <!--  thread is the short name for
      org.hibernate.context.ThreadLocalSessionContext
      and let Hibernate bind the session automatically to the thread
    -->
    <property name="current_session_context_class">thread</property>
    <!-- this will show us all sql statements -->
    <property name="hibernate.show_sql">true</property>
	<property name="hibernate.format_sql">true</property>
	<!--  Achtung nicht in Produktion verwenden, das Schema wird automatisch erzeugt -->
	<!--  <property name="hibernate.hbm2ddl.auto">validate</property> -->
</session-factory>
</hibernate-configuration>   

  <?xml version="1.0" encoding="UTF-8"?>
<persistence version="1.0" xmlns="http://java.sun.com/xml/ns/persistence"
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xsi:schemaLocation="http://java.sun.com/xml/ns/persistence
    http://java.sun.com/xml/ns/persistence/persistence_1_0.xsd">

<persistence-unit name="bafoeg3">
		<properties>
			<property name="hibernate.ejb.cfgfile" value="/hibernate.cfg.xml" />
		</properties>
</persistence-unit>
</persistence>