Semaphore not being released properly

[pixelstuermer]

Test Setup 1

• DockerPostgresDatabaseProvider provider
• No specified max_connections property (therefore default 300)
• Single integration test executed 500 times using JUnit's @RepeatedTest annotation
• @FlywayTest with custom migration script at method level

Expected Behavior

• Test being executed 500 times

Actual Behavior

• Test is only executed 149 times (about half of the 300 max_connections)

Debugging

The Semaphore of the BlockingDataSourceWrapper decreases with -1 but only sometimes increases with +1. Nevertheless 3 connections seem to be blocked from the very start.

Test Setup 2

• Same setup as the first setup
• But having the @FlywayTest annotation with custom migration script at class level

Expected Behavior

• Test being executed 500 times

Actual Behavior

• Test is properly executed 500 times

Debugging

The Semaphore of the BlockingDataSourceWrapper clearly increases and decreases with +/- 1 throughout all 500 tests. Also 3 connections seem to be blocked from the very start.

[tomix26]

Thanks for the report and the detailed instructions to simulate the problem. I will take a look at it.

[pixelstuermer]

Thanks for taking care of it so fast and even for releasing so fast 👍