Failed to bind after upgrading to java 21

[pbthorste]

Expected Behavior

The application should have started without logging a warning

Actual Behaviour

After application was configured to use java 21 - at startup, the application logs this warning:

level=WARN  : Failed to bind as java.util.concurrent.ThreadPerTaskExecutor is unsupported. thrd=[main] logger=io.micrometer.core.instrument.binder.jvm.ExecutorServiceMetrics

Not sure if this is a micronaut or a micrometer issue.

Steps To Reproduce

No response

Environment Information

Operating system: Linux
JDK: 21 (coretto)

Example Application

No response

Version

4.2.2

[jeremyg484]

It looks like Micrometer does not provide any instrumentation for an ExecutorService that uses virtual threads. See micrometer-metrics/micrometer#3650 and micrometer-metrics/micrometer#3956.

I think the appropriate thing for us to do is detect usage of virtual threads in our ExecutorServiceMetricsBinder and not try to bind ExecutorServiceMetrics in that case.

Given that, I believe this particular warning can be safely ignored in the meantime.

[pbthorste]

Thank you @jeremyg484 :)

[mdeso]

I still get this warning with Micronaut platform 4.3.7, micronaut-micrometer 5.4.0

[jeremyg484]

I still get this warning with Micronaut platform 4.3.7, micronaut-micrometer 5.4.0

It did not end up getting included in the 4.3.x releases as we've not done an updated release of this module yet. It should definitely get included in 4.4.0.