Hi, I am using http://code.google.com/appengine/docs/java/taskqueue/overview.html#Task_Within_Transactions way to enqueue two tasks in transaction. But I am not saving any datastore entities. I am using objectify.
I got this message: java.util.ConcurrentModificationException: too much contention on these datastore entities. please try again. at com.google.appengine.api.datastore.DatastoreApiHelper.translateError(DatastoreApiHelper.java: 39) at com.google.appengine.api.datastore.DatastoreApiHelper.makeSyncCall(DatastoreApiHelper.java: 75) at com.google.appengine.api.datastore.TransactionImpl.makeSyncCall(TransactionImpl.java: 44) at com.google.appengine.api.datastore.TransactionImpl.makeSyncCall(TransactionImpl.java: 52) at com.google.appengine.api.datastore.TransactionImpl.commit(TransactionImpl.java: 64) When this happened only one task needed to be added to queue, so why this error ? -- You received this message because you are subscribed to the Google Groups "Google App Engine" group. To post to this group, send email to google-appeng...@googlegroups.com. To unsubscribe from this group, send email to google-appengine+unsubscr...@googlegroups.com. For more options, visit this group at http://groups.google.com/group/google-appengine?hl=en.