Thanks for the reply Andrus! Sounds like it might be the case. But actually, this now happens without the DB going down (and I don’t think it’s a communication problem with the DB either, since the DB runs on the same server as the apps).
I recently added a PostCommitListener that does quite a lot of DB work and I believe the issue started around the same time. At first I thought it might be a deadlocking sitation, but a jstack thread dump from a dead process does not point to that. Is there any way for me to check the number and status of currently open connections? Cheers, - hugi > On 7. mar. 2016, at 18:54, Andrus Adamchik <and...@objectstyle.org> wrote: > > Hmm... It shows there are zero connections in the pool. I have a theory about > that. Looks like when you uncheck your first connection after the DB restart, > pool goes through all connections to find a valid one, and removing bad > connections in the process. As there are no longer valid connections there, > the pool is drained completely. Then the error happens; and then at a later > time, pool manager thread kicks in and fills the pool with new connections. > > I need to test it.. And perhaps move the validation to background. > > (and perhaps add Tomcat connection pool to a list of DataSource options ... > that's the one I am using in Bootique: https://github.com/nhl/bootique-jdbc > and elsewhere in production). > > Andrus > >> On Mar 7, 2016, at 2:46 AM, Hugi Thordarson <h...@karlmenn.is> wrote: >> >> Hi all, >> This is still happening, even after I added a validationQuery, our app is >> dying quite frequently :(. I’m not quite sure how to debug this, is there >> any way for me to catch where connections are being opened in the code and >> at what location they’re hanging? >> >> https://www.dropbox.com/s/8jkmh6513s6wwkn/Screenshot%202016-03-07%2010.21.53.png?dl=0 >> >> Cheer, >> - hugi >> >> // Hugi Thordarson >> // http://www.loftfar.is/ >> // s. 895-6688 >> >> >> >>> On 29. feb. 2016, at 11:25, Andrus Adamchik <and...@objectstyle.org> wrote: >>> >>> >>>> On Feb 29, 2016, at 2:20 PM, Hugi Thordarson <h...@karlmenn.is> wrote: >>>> >>>> What does validationQuery do? >>> >>> Periodically executes for each pooled connection, and kills connections >>> that throw during validation. So it ensures that all pooled connections are >>> in a good state. >>> >>> Andrus >>> >> >
