When I run my application I got this error:

Caused by: org.hibernate.DuplicateMappingException: Duplicate collection role mapping org.jbpm.bytes.ByteArray.byteBlocks

I set the mapping in this way:

<spring:bean id="jbpmSessionFactory" class="org.springframework.orm.hibernate3.LocalSessionFactoryBean">
<spring:property name="dataSource">
<spring:ref local="jbpmDataSource" />
</spring:property>
<spring:property name="mappingLocations">
<spring:value>classpath*:/org/jbpm/**/*.hbm.xml</spring:value>
</spring:property>
<spring:property name="typeDefinitions">
<spring:ref local="jbpmTypes" />
</spring:property>
<spring:property name="hibernateProperties">
<spring:props>
<spring:prop key="hibernate.dialect">org.hibernate.dialect.DerbyDialect</spring:prop>
<spring:prop key="hibernate.cache.provider_class">org.hibernate.cache.HashtableCacheProvider</spring:prop>
<!-- Create/update the database tables automatically when the JVM starts up -->
<spring:prop key="hibernate.hbm2ddl.auto">update</spring:prop>
</spring:props>
</spring:property>
</spring:bean>

Does anyone of you know what problem is?

thanks