I also got the same error, I fixed it, what you do is put the following 
properties in the persistence.xml

  | <property name="hibernate.transaction.flush_before_completion" 
value="true"/>
  | <property name="hibernate.transaction.auto_close_session" value="true"/>
  | 

and then you put this property in your Spring Configuration, for the 
EntityManagerFactory


  | <property name="jpaVendorAdapter">
  |     <bean 
class="org.springframework.orm.jpa.vendor.HibernateJpaVendorAdapter">
  |             <property name="database" value="MYSQL" />
  |             <property name="showSql" value="false" />
  |                 <property name="generateDdl" value="false"/>
  |     </bean>
  | </property>
  | 

This seemed to solve the problem

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