ARTEMIS-5948 Use Varhandle implementations from jctools

[cortlepp]

Artemis currently uses some queues from jctools-core which rely on sun.misc.Unsafe internally. These methods are deprecated in JDK24+, issue a warning at runtime and will be removed in future versions of the JDK. Thus it makes sense to switch to an implementation which does not rely on those methods.

In their latest release JCTools have started to publish a new artifact, jctools-core-jdk11, which contains alternative Varhandle based implementations which do not use Unsafe. As far as I understand them they are designed to be a drop-in replacement to the existing Unsafe implementations.

[clebertsuconic]

If we could wait the 2.53.0 release.. only merge this after 2.53 please?

[cortlepp]

Currently org.apache.activemq.artemis.tests.integration.karaf.ArtemisFeatureTest is failing in JDK 17 and 21 (it passes in JDK 25) on line 152. I can't really tell from the test what the underlying problem is, since the test works with a timeout it might also just be flakiness. If someone knows more about this I would appreciate any advice.

[gemmellr]

If we could wait the 2.53.0 release.. only merge this after 2.53 please?

I'd agree that would make sense. Its not yet mergeable anyhow though.

[gemmellr]

Currently org.apache.activemq.artemis.tests.integration.karaf.ArtemisFeatureTest is failing in JDK 17 and 21 (it passes in JDK 25) on line 152. I can't really tell from the test what the underlying problem is, since the test works with a timeout it might also just be flakiness. If someone knows more about this I would appreciate any advice.

Note that the JDK25 fast-tests job passed only because the failing test is not run on JDK25. At least at the time Artemis started working on 25, Karaf didnt work on 25, so those tests had to be omitted.

I believe it failing on the line it is indicates the server bundle failed to start. I seem to recall there being a dir somewhere deep in the target dir where you can find the logs to help diagnose further.