applicationContext.xml
<!-- common transaction manager -->
<bean id="transactionManager"
class="org.springframework.orm.hibernate3.HibernateTransactionManager">
<property name="sessionFactory" ref="sessionFactory"/>
</bean>
<!-- activiti processEngineConfiguration -->
<bean id="processEngineConfiguration" class="org.activiti.spring.SpringProcessEngineConfiguration">
............................
<property name="transactionManager" ref="transactionManager" />
...........................
</bean>