Also, a small unit test would be great. On Wed, Aug 3, 2011 at 9:15 AM, Rick Curtis <curti...@gmail.com> wrote:
> What version of OpenJPA are you using? > > > On Wed, Aug 3, 2011 at 2:59 AM, Michael Pflueger > <michael.pflue...@sma.de>wrote: > >> Hi, >> >> Can anyone of you give a hint about traversing huge result sets using >> OpenJPA? >> >> I've tried enabling large/scrolling result sets by setting FetchBatchSize. >> However, when I iterate over the result, I need to repeatedly call >> entityManager.clear(), because a simple entityManager.detach(object) after >> each access is not enough to clean old objects from the heap and thus I get >> OutOfMemory erros without the clean(). >> >> entitymanager.clean() seems to work fine without large result sets >> enabled. >> With LRS enabled, however, I get a problem during the traversal, because >> after a clean() call the iterator delivers an object that openjpa thinks is >> managed, but the object contains a lazy one to many relation and I can't >> access it, I get a nullpointer exception. I've tried detaching and merging >> the object I get from the iterator, but this does not help, openjpa does >> neither detach nor merge it properly so I can use the lazy association >> again. >> >> So I'm a bit puzzled about how people traverse large sets of data, and >> about why a simple detach of objects is not enough to let the garbace >> collector clean them... I have not configured any additional cache. >> I could try to provide a simple testcase if one is needed. >> >> >> Regards, >> Michael >> ___________________________________________________ >> >> SMA Solar Technology AG >> Aufsichtsrat: Guenther Cramer (Vorsitzender) >> Vorstand: Juergen Dolle, Roland Grebe, Uwe Hertel, Pierre-Pascal Urbon, >> Marko Werner >> Handelsregister: Amtsgericht Kassel HRB 3972 >> Sitz der Gesellschaft: 34266 Niestetal >> USt-ID-Nr. DE 113 08 59 54 >> WEEE-Reg.-Nr. DE 95881150 >> ___________________________________________________ >> > > > > -- > *Rick Curtis* > > -- *Rick Curtis*
