waitOnLOck on several threads when db connection lost

Please visit https://groups.google.com/forum/#!topic/akka-user/Ehzioy3jVoU for detailed informations and stacktraces. Here's the diagnosis of HikariCP main developper :

"It appears that you are using the PostgreSQL CopyManager, correct?  Looking at QueryExecutorImpl it appears that rollback() is trying to obtain a lock that was not released by the CopyManager.  I recommend using the CopyManager.copyIn() method that returns a CopyIn object, rather than using the convenience method that takes a reader.  Use the writeToCopy() to pump the data in, and be sure to catch SQLException.  If you get an SQLException, call cancelCopy() and retry or whatever your recovery scenario is, otherwise call endCopy().  I would have expected PostgreSQL to handle the severing of a Connection in the middle of a bulk copy better, but that is probably a question for the PostgreSQL group."