During benchmarking we saw a lot of contention when hibernate is returning connections.
With this fix below the total contention time (aggregated across all threads) over a 5min period in s/state for that lock in SemaphoreArrayListManagedConnectionPool has gone from 39min 55s to 17s.
https://github.com/johnaoahra80/ironjacamar/commit/f32885818bc0048522a0865dd89e98719853c74f
We havent seen any errors with this change in the IJ testsuite or in the benchmark we're running.