No, but I have single global instance of PersistenceManagerFactory, and from it I call getPersistenceManager() every time I need it.
perjantaina 13. toukokuuta 2011 18.07.22 UTC+3 Ikai L (Google) kirjoitti: > > Do you just have a single global instance of persistence manager, or do you > use the factory method? > > Ikai Lan > Developer Programs Engineer, Google App Engine > Blog: http://googleappengine.blogspot.com > Twitter: http://twitter.com/app_engine > Reddit: http://www.reddit.com/r/appengine > > > > On Thu, May 12, 2011 at 1:47 AM, Juha K <juha.k...@gmail.com> wrote: > >> I've been running an application successfully for some time on the app >> engine. During last week I've couple of times tried enabling threadsafe in >> my app. It seems to randomly cause issues with retrieving or storing data >> with JDO. What I see when I start to get these issues is this (I've replaced >> my apps class names with ---): >> java.lang.UnsupportedOperationException >> at >> org.datanucleus.store.appengine.EntityUtils.getPropertyName(EntityUtils.java:62) >> at >> org.datanucleus.store.appengine.DatastoreFieldManager.storeObjectField(DatastoreFieldManager.java:839) >> at >> org.datanucleus.store.appengine.DatastoreFieldManager.storeStringField(DatastoreFieldManager.java:474) >> at >> org.datanucleus.state.AbstractStateManager.providedStringField(AbstractStateManager.java:1023) >> at ---.jdoProvideField(VAJDO.java) >> at ---.jdoProvideFields(VAJDO.java) >> at >> org.datanucleus.state.JDOStateManagerImpl.provideFields(JDOStateManagerImpl.java:2715) >> at >> org.datanucleus.store.appengine.DatastorePersistenceHandler.insertPreProcess(DatastorePersistenceHandler.java:341) >> at >> org.datanucleus.store.appengine.DatastorePersistenceHandler.insertObjects(DatastorePersistenceHandler.java:251) >> at >> org.datanucleus.store.appengine.DatastorePersistenceHandler.insertObject(DatastorePersistenceHandler.java:240) >> at >> org.datanucleus.state.JDOStateManagerImpl.internalMakePersistent(JDOStateManagerImpl.java:3185) >> at >> org.datanucleus.state.JDOStateManagerImpl.makePersistent(JDOStateManagerImpl.java:3161) >> at >> org.datanucleus.ObjectManagerImpl.persistObjectInternal(ObjectManagerImpl.java:1298) >> at >> org.datanucleus.ObjectManagerImpl.persistObject(ObjectManagerImpl.java:1175) >> at >> org.datanucleus.jdo.JDOPersistenceManager.jdoMakePersistent(JDOPersistenceManager.java:669) >> at >> org.datanucleus.jdo.JDOPersistenceManager.makePersistent(JDOPersistenceManager.java:694) >> >> I've seen the same exception also when calling >> PersistenceManager.getObjectById(). The call to these methods comes directly >> from servlet requests. >> >> The error doesn't always happen, sometimes (especially for writes) when it >> starts to happen, it seems to happen to all writes. I've set threadsafe to >> false in my appengine-web.xml and the error goes away. But especially now >> knowing the upcoming change in the pricing, I'd like to be able to run my >> app multithreaded. My question is that is this a bug in the app engine, or >> should I be synchronizing JDO use in my app in order to run it with >> threadsafe=true? >> >> >> -- >> 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-app...@googlegroups.com. >> To unsubscribe from this group, send email to >> google-appengine...@googlegroups.com. >> For more options, visit this group at >> http://groups.google.com/group/google-appengine-java?hl=en. >> > > -- 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.
