GWT + Hibernate 3.0 - Serialização - Socorro!

Galera estou com o seguinte problema, realizei os mapeamentos das minhas classes para o hibernate, quando busco do banco de dados um objeto que possui um relacionamento com outro, através da Collection Set, da o seguinte problema:
Alguém ja passou por isso ?
Existe uma maneira para eu fazer com que o hibernate não busque automaticamente esses objetos relacionados, assim não terá referencia a classe org.hibernate.collection.PersistentSet, e ocorrerá tudo normalmente ?

[WARN] StandardContext[]Exception while dispatching incoming RPC call
com.google.gwt.user.client.rpc.SerializationException: java.lang.reflect.InvocationTargetException
at com.google.gwt.user.server.rpc.impl.ServerSerializationStreamWriter.serializeWithCustomSerializer(ServerSerializationStreamWriter.java:424)
at com.google.gwt.user.server.rpc.impl.ServerSerializationStreamWriter.serializeImpl(ServerSerializationStreamWriter.java:384)
at com.google.gwt.user.server.rpc.impl.ServerSerializationStreamWriter.serialize(ServerSerializationStreamWriter.java:333)
at com.google.gwt.user.client.rpc.impl.AbstractSerializationStreamWriter.writeObject(AbstractSerializationStreamWriter.java:81)
at com.google.gwt.user.server.rpc.impl.ServerSerializationStreamWriter.serializeValue(ServerSerializationStreamWriter.java:259)
at com.google.gwt.user.server.rpc.RPC.encodeResponse(RPC.java:574)
at com.google.gwt.user.server.rpc.RPC.encodeResponseForSuccess(RPC.java:442)
at com.google.gwt.user.server.rpc.RPC.invokeAndEncodeResponse(RPC.java:530)
at com.google.gwt.user.server.rpc.RemoteServiceServlet.processCall(RemoteServiceServlet.java:265)
at com.google.gwt.user.server.rpc.RemoteServiceServlet.doPost(RemoteServiceServlet.java:187)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:709)
Caused by: java.lang.reflect.InvocationTargetException: null
at com.google.gwt.user.server.rpc.impl.ServerSerializationStreamWriter.serializeWithCustomSerializer(ServerSerializationStreamWriter.java:409)
at com.google.gwt.user.server.rpc.impl.ServerSerializationStreamWriter.serializeImpl(ServerSerializationStreamWriter.java:384)
at com.google.gwt.user.server.rpc.impl.ServerSerializationStreamWriter.serialize(ServerSerializationStreamWriter.java:333)
at com.google.gwt.user.client.rpc.impl.AbstractSerializationStreamWriter.writeObject(AbstractSerializationStreamWriter.java:81)
at com.google.gwt.user.server.rpc.impl.ServerSerializationStreamWriter.serializeValue(ServerSerializationStreamWriter.java:259)
at com.google.gwt.user.server.rpc.RPC.encodeResponse(RPC.java:574)
at com.google.gwt.user.server.rpc.RPC.encodeResponseForSuccess(RPC.java:442)
at com.google.gwt.user.server.rpc.RPC.invokeAndEncodeResponse(RPC.java:530)
at com.google.gwt.user.server.rpc.RemoteServiceServlet.processCall(RemoteServiceServlet.java:265)
at com.google.gwt.user.server.rpc.RemoteServiceServlet.doPost(RemoteServiceServlet.java:187)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:709)
[color=darkred]Caused by: com.google.gwt.user.client.rpc.SerializationException: Type ‘org.hibernate.collection.PersistentSet’ was not included in the set of types which can be serialized by this SerializationPolicy. For security purposes, this type will not be serialized.[/color]
at com.google.gwt.user.server.rpc.impl.StandardSerializationPolicy.validateSerialize(StandardSerializationPolicy.java:79)
at com.google.gwt.user.server.rpc.impl.ServerSerializationStreamWriter.serialize(ServerSerializationStreamWriter.java:331)
at com.google.gwt.user.client.rpc.impl.AbstractSerializationStreamWriter.writeObject(AbstractSerializationStreamWriter.java:81)
at com.google.gwt.user.server.rpc.impl.ServerSerializationStreamWriter.serializeValue(ServerSerializationStreamWriter.java:259)
at com.google.gwt.user.server.rpc.impl.ServerSerializationStreamWriter.serializeClass(ServerSerializationStreamWriter.java:357)
at com.google.gwt.user.server.rpc.impl.ServerSerializationStreamWriter.serializeImpl(ServerSerializationStreamWriter.java:390)
at com.google.gwt.user.server.rpc.impl.ServerSerializationStreamWriter.serialize(ServerSerializationStreamWriter.java:333)
at com.google.gwt.user.client.rpc.impl.AbstractSerializationStreamWriter.writeObject(AbstractSerializationStreamWriter.java:81)
at com.google.gwt.user.client.rpc.core.java.lang.Object_Array_CustomFieldSerializer.serialize(Object_Array_CustomFieldSerializer.java:39)
at com.google.gwt.user.server.rpc.impl.ServerSerializationStreamWriter.serializeWithCustomSerializer(ServerSerializationStreamWriter.java:409)

Eu ja tive problemas de n conseguir serializar pq os objetos relacionados ainda eram proxies
Pode resolver isso desabilitando o lazy loading ou setando os objetos como null se n precisar…
mas n sei se eh esse seu problema

Como desabilito o lazy loading nos meus relacionamentos do hibernate, em qual tag que devo inserir essa propriedade

&lt?xml version="1.0" encoding="UTF-8"?&gt
<!DOCTYPE hibernate-mapping PUBLIC "-//Hibernate/Hibernate Mapping DTD 3.0//EN"
	"http://hibernate.sourceforge.net/hibernate-mapping-3.0.dtd">

<hibernate-mapping>
	<class name="com.ccp.tgi.wikijava.client.model.Artigo" >

		<!-- Identificador da classe -->
		<id name="id">
			<generator class="increment"/>
		</id>
	
		<!-- Propriedades da classe -->
		<property name="tit_Artigo"/>
		<property name="ds_Artigo"/>
		<property name="dt_Altera"/>
		
		<!-- Relacionamento da classe com Usuario -->
		<many-to-one 
			name="usuario" 
			class="com.ccp.tgi.wikijava.client.model.Usuario"
			column="Usuario_Altera"/>
			
		<!-- Relacionamento da classe com Historico -->
		<set name="historico" inverse="true" >
			<key column="Id_Artigo"/>
			<one-to-many class="com.ccp.tgi.wikijava.client.model.Historico"/>	
		</set>
		
		
		<!-- Relacionamento da classe com Favorito-->
		<set name="favoritos" inverse="true" >
			<key column="Id_Artigo"/>
			<one-to-many class="com.ccp.tgi.wikijava.client.model.Favoritos"/>	
		</set>		
	</class>
</hibernate-mapping>