Spring+JPA(hibernate)+JBPM4 can not integrated

I'm using JPA (hibernate implementation) so I would like to know how can I integrate them.

spring applicationContext.xml
<bean id="entityManagerFactory" class="org.springframework.orm.jpa.LocalContainerEntityManagerFactoryBean"
p:dataSource-ref="dataSource">
<property name="jpaVendorAdapter">
<bean class="org.springframework.orm.jpa.vendor.HibernateJpaVendorAdapter">
<property name="showSql" value="true" />
<property name="generateDdl" value="true" />
<property name="databasePlatform" value="${hibernate.dialect}" />
</bean>
</property>
</bean>

jbpm.cfg.xml
<process-engine-context>
<command-service>
<retry-interceptor />
<environment-interceptor />
<spring-transaction-interceptor />
</command-service>
</process-engine-context>

<transaction-context>
<transaction />
<hibernate-session current="true" />
</transaction-context>