HikariCP - connection is not available

Question

We have Spring-boot/Hibernate/PostgreSQL application in our project and use Hikari as the connection pool. We keep running into the following problem: after few hours active

Answer 1

I managed to fix it finally. The problem is not related to HikariCP. The problem persisted because of some complex methods in REST controllers executing multiple changes in DB through JPA repositories. For some reasons calls to these interfaces resulted in a growing number of "freezed" active connections, exhausting the pool. Either annotating these methods as @Transactional or enveloping all the logic in a single call to transactional service method seem to solve the problem.