Based on your experience it seems to be that the problem is in the access to PersistenceManagerFactory.getPersistenceManager()? If your PMF-class fixes the problem, then it seems that call to getPersistenceManager() should be synchronized in multithreaded apps. Can anyone confirm this?
I found this issue: http://code.google.com/p/datanucleus-appengine/issues/detail?id=203 (Unexpected UnsupportedOperationException when calling getObjectById()) and used the workaround proposed there (doing a query in the start up). So far it seems to be working ok. lauantaina 14. toukokuuta 2011 8.26.02 UTC+3 Aaron Shepherd kirjoitti: > > I'm using this modified PMF class now and it seems to fix this > problem, with the caveat that I haven't done any heavy load testing > yet. > > public final class PMF > { > private static final PersistenceManagerFactory pmfInstance = > JDOHelper.getPersistenceManagerFactory("transactions- > optional"); > > private PMF() > { > } > > public synchronized static PersistenceManagerFactory get() > { > return pmfInstance; > } > > public synchronized static PersistenceManager > getPersistenceManagerInstance() > { > return pmfInstance.getPersistenceManager(); > } > } > > Aaron Shepherd > OnFast.com > > -- You received this message because you are subscribed to the Google Groups "Google App Engine for Java" group. To post to this group, send email to google-appengine-java@googlegroups.com. To unsubscribe from this group, send email to google-appengine-java+unsubscr...@googlegroups.com. For more options, visit this group at http://groups.google.com/group/google-appengine-java?hl=en.
