> On 7 May 2021, at 13:34, John Huss <johnth...@gmail.com> wrote: > > On Fri, May 7, 2021 at 8:18 AM Hugi Thordarson <h...@karlmenn.is> wrote: > >> Well I'll be… Over two decades of full time Java and I somehow didn't know >> about that stack trace omission. Yikes. Thanks! > > You’ve just never caused an error that bad before right? 😉
*cough* yes. Of course, that must be it 😁 >> .... >> So it seems either 'snapshot' or 'objAttribute' is null, probably the >> snapshot, right? Any ideas why that might be? >> > > Yeah, it would be the snapshot is null. The snapshot cache is limited in > size, so it may have purged that entry if you have a busy server. You could > try increasing the size of the snapshot cache: > > org.apache.cayenne.configuration.Constants.SNAPSHOT_CACHE_SIZE_PROPERTY Good thinking, but I've already got a ginormous snapshot cache (3.000.000) for the traffic, so I don't think that's it. Going to hammer away on this code path a bit and see if I can replicate the error. >> >> - hugi >> >> >> >>> On 7 May 2021, at 12:53, John Huss <johnth...@gmail.com> wrote: >>> >>> Or if you have older logs, you can look back farther to find one without >>> the cause omitted. >>> >>> On Fri, May 7, 2021 at 7:52 AM John Huss <johnth...@gmail.com> wrote: >>> >>>> It will omit the trace if it has happened a very large number of times. >> If >>>> you restart the server it will start printing it again when it happens. >>>> >>>> On Fri, May 7, 2021 at 7:26 AM Hugi Thordarson <h...@karlmenn.is> >> wrote: >>>> >>>>> One would think so, but there's just no stack trace printed for the >>>>> NullPointerException. >>>>> >>>>> >>>>>> On 7 May 2021, at 12:24, John Huss <johnth...@gmail.com> wrote: >>>>>> >>>>>> The first line of the stack after the Caused By line would tell you >> the >>>>>> line with the problem, wouldn't it? What was that line? >>>>>> >>>>>> On Fri, May 7, 2021 at 7:16 AM Hugi Thordarson <h...@karlmenn.is> >>>>> wrote: >>>>>> >>>>>>> Hi all, >>>>>>> >>>>>>> occasionally my users encounter errors when committing changes to the >>>>> DB. >>>>>>> The relevant part of the stack trace looks like this: >>>>>>> >>>>>>> --------- >>>>>>> org.apache.cayenne.CayenneRuntimeException: [v.4.1 Jul 14 2020 >>>>> 10:26:08] >>>>>>> Commit Exception >>>>>>> at >>>>>>> >>>>> >> org.apache.cayenne.access.DataContext.flushToParent(DataContext.java:774) >>>>>>> at >>>>>>> >>>>> >> org.apache.cayenne.access.DataContext.commitChanges(DataContext.java:691) >>>>>>> [...removed rest of trace…] >>>>>>> Caused by: java.lang.NullPointerException >>>>>>> --------- >>>>>>> >>>>>>> Unfortunately I've been unable to reproduce this error, so before I >>>>> dive >>>>>>> into it I'm wondering if this looks familiar to anyone, if there are >>>>>>> obvious places to look or if there are recommendations for strategies >>>>> to >>>>>>> debug? >>>>>>> >>>>>>> Cheers, >>>>>>> - hugi >>>>> >>>>> >> >>
