Hi, I have orderline defined as LRS in Orders.In persistence.xml I have this defined
<property name="openjpa.FetchBatchSize" value="1" /> My test program gives the above error em.getTransaction().begin(); Query query = em.createQuery("select object(o)from Orders o where o.o_id=3001 and o.o_d_id='02' and o.o_w_id='0005'"); List rs1 = query.getResultList(); Orders ord = (Orders)rs1.get(0); Set l = ord.getOrderline(); Iterator it = l.iterator(); *while* (it.hasNext()){ System.*out*.println(((Orderline)it.next()).toString()); } OpenJPAPersistence.*close*(it); em.getTransaction().commit(); em.close(); here is the stack trace produced Exception in thread "main" <4|false|0.0.0> * org.apache.openjpa.persistence.InvalidStateException*: You cannot transfer large result set fields from one object or field to another. at org.apache.openjpa.util.AbstractLRSProxyCollection.setOwner( AbstractLRSProxyCollection.java) at org.apache.openjpa.kernel.DetachManager$DetachFieldManager.reproxy(* DetachManager.java:517*) at org.apache.openjpa.kernel.DetachManager.detachInternal(* DetachManager.java:425*) at org.apache.openjpa.kernel.DetachManager.detachAll(*DetachManager.java:293 *) at org.apache.openjpa.kernel.BrokerImpl.detachAllInternal(*BrokerImpl.java :3120*) at org.apache.openjpa.kernel.BrokerImpl.free(*BrokerImpl.java:3996*) at org.apache.openjpa.kernel.BrokerImpl.close(*BrokerImpl.java:3983*) at org.apache.openjpa.kernel.DelegatingBroker.close(*DelegatingBroker.java :1260*) at org.apache.openjpa.persistence.EntityManagerImpl.close(* EntityManagerImpl.java:981*) at tutorial.ejb.Test.main(Test.java) Any idea why is this happening ritika