<?xml version='1.0' encoding='utf-8'?>
<!DOCTYPE hibernate-configuration PUBLIC "-//Hibernate/Hibernate Configuration DTD//EN"
"http://hibernate.sourceforge.net/hibernate-configuration-2.0.dtd">

<hibernate-configuration>
<session-factory>
<property name="hibernate.connection.driver_class">org.gjt.mm.mysql.Driver</property>
<property name="hibernate.connection.url">jdbc:mysql://localhost/test</property>
<property name="hibernate.connection.username"></property>
<property name="hibernate.connection.password"></property>
<property name="hibernate.connection.pool.size">20</property>
<property name="hibernate.dialect">net.sf.hibernate.dialect.MySQLDialect</property>

<!-- Mapping files -->
<mapping resource="persistence/Stuser.hbm.xml"/>

</session-factory>

</hibernate-configuration>

If I add one mapping,
<!-- Mapping files -->
<mapping resource="persistence/Stuser.hbm.xml"/>
<mapping resource="persistence/Stforum.hbm.xml"/>


then,error.why?

Call psychic friends network.