I am using Objectify. This error happens when updating a single datastore entity. There is NO TRANSACTION. My working flow as follows:
1 Entity entity1 = Objectify.read(id1) 2 Modify entity1's property and put "update(entity1)" in a taskqueue 3 When task executes: Objectify.save(entity1) Then I get java.util.ConcurrentModificationException: too much contention on these datastore entities It's so weird because the log shows that even two requests try to update entity1, their execution interval could be more than 10s. I am a new GAE user, anybody helps me ? -- You received this message because you are subscribed to the Google Groups "Google App Engine" group. To unsubscribe from this group and stop receiving emails from it, send an email to google-appengine+unsubscr...@googlegroups.com. To post to this group, send email to google-appengine@googlegroups.com. Visit this group at http://groups.google.com/group/google-appengine. To view this discussion on the web visit https://groups.google.com/d/msgid/google-appengine/52790fdf-d521-4f95-b35d-217bcbe2379c%40googlegroups.com. For more options, visit https://groups.google.com/d/optout.
