Duplicate collection role mapping error?jbpm工作流问题

my exception:
 Error creating bean with name 'sessionFactory' defined in ServletContext resource [/WEB-INF/applicationContext-common.xml]: Invocation of init method failed; nested exception is org.hibernate.DuplicateMappingException: Duplicate collection role mapping org.jbpm.bytes.ByteArray.byteBlocks
Caused by: org.hibernate.DuplicateMappingException: Duplicate collection role mapping org.jbpm.bytes.ByteArray.byteBlocks
========================================applicationContext.xml======================================================= <?xml version="1.0" encoding="UTF-8"?><!--
- Application context definition for JPetStore's business layer.
- Contains bean references to the transaction manager and to the DAOs in
- dataAccessContext-local/jta.xml (see web.xml's "contextConfigLocation").
-->
<beans xmlns="http://www.springframework.org/schema/beans"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xmlns:aop="http://www.springframework.org/schema/aop"
xmlns:tx="http://www.springframework.org/schema/tx"
xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-2.0.xsd
           http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop-2.0.xsd
           http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx-2.0.xsd"> <!-- 配置SessionFactory  -->
<bean id="sessionFactory"
class="org.springframework.orm.hibernate3.LocalSessionFactoryBean">
<property name="configLocation">
<value>classpath:hibernate.cfg.xml</value>
</property>
<property name="mappingLocations"> <value>classpath*:org/jbpm/**/*.hbm.xml</value>
</property> </bean>
              
<bean id="jbpmConfiguration"
class="org.springmodules.workflow.jbpm31.LocalJbpmConfigurationFactoryBean">
<property name="configuration" value="classpath:jbpm.cfg.xml"></property>
</bean>
</beans>