Hibernate version: 3.1.2

Mapping documents:
<?xml version="1.0"?>
<!DOCTYPE hibernate-mapping PUBLIC "-//Hibernate/Hibernate Mapping DTD 3.0//EN" "http://hibernate.sourceforge.net/hibernate-mapping-3.0.dtd">
<hibernate-mapping package="br.com.sapiensit.sigterra.common.model.bo" default-lazy="false">

<class name="PessoaBO" table="VW_PESSOA" mutable="false">
<id name="id" type="java.lang.Long" column="ID">
<generator class="sequence">
<param name="sequence">SQ_PESSOA</param>
</generator>
</id>
<discriminator column="TP_PESSOA" type="string"/>
<property name="nome" column="NM_PESSOA" not-null="true"/>
<property name="email" column="DS_EMAIL"/>
<property name="tipo" column="TP_PESSOA" insert="false" update="false"/>

<subclass name="PessoaNaturalBO" discriminator-value="1">
<property name="sexo" column="TP_SEXO"/>
<property name="estadoCivil" column="TP_ESTADO_CIVIL"/>
<property name="cpf" column="NR_CPF"/>
</subclass>
<subclass name="PessoaJuridicaBO" discriminator-value="2">
<property name="cnpj" column="NR_CNPJ"/>

<subclass name="CartorioBO">
<join table="TB_CARTORIO" fetch="select">
<key column="ID"/>
</join>
</subclass>
</subclass>
</class>
</hibernate-mapping>


I would like to know if its correct to have a subclass with join and without discriminator. I've searched the forum and found no topic! Sorry for amateur question. The intension here is to simulate a joined-subclass. Is it correct?

Thanks in advance.

It's fine to put a subclass within a subclass, but I can't see the point of it in your example. Why not just use CartorioBO where PessoaJuridicaBO is currently? There is no requirement to model every class in a hierarchy in the mapping file: hibernate only needs to know about classes that it actually has to instantiate.