Migrate Kotlin test setup to a convention plugin

[bric3]

What Does This Do

Replaces the shared Kotlin test script with the dd-trace-java.conventions.testing.kotlin convention and migrates its four consumers. The convention also wires Kotlin outputs for JVM test suites and test fixtures.

Motivation

The name describes Kotlin test support. Groovy interoperability is configured only when the Groovy plugin is present and follows Gradle test source sets.

Additional Notes

This convention lands in the preferred build-logic/ location because projects apply it directly, on demand. It could move to buildSrc/, but that is not the desired goal. Conventions should move there only when their types or plugins must be visible to other buildSrc/ plugins or legacy script plugins through Gradle’s shared build-script classloader.

[dd-octo-sts]

🟢 Java Benchmark SLOs — All performance SLOs passed

Suite	Status
Startup	🟢 pass

SLO thresholds are defined here based on automatically generated metrics. A warning is raised when results are within 5% of the threshold.

PR vs. master results

Scenario	Candidate	master	Δ (95% CI of mean)
startup:insecure-bank:iast:Agent	14.84 s	14.72 s	[-0.2%; +1.8%] (no difference)
startup:insecure-bank:tracing:Agent	13.61 s	13.69 s	[-1.5%; +0.3%] (no difference)
startup:petclinic:appsec:Agent	16.91 s	16.86 s	[-0.7%; +1.3%] (no difference)
startup:petclinic:iast:Agent	16.96 s	16.92 s	[-0.4%; +0.8%] (no difference)
startup:petclinic:profiling:Agent	16.67 s	16.77 s	[-1.9%; +0.6%] (no difference)
startup:petclinic:sca:Agent	16.81 s	16.49 s	[+1.0%; +2.8%] (maybe worse)
startup:petclinic:tracing:Agent	16.10 s	16.19 s	[-1.5%; +0.3%] (no difference)

Commit: a8b24c4a · CI Pipeline · Benchmarking Platform UI

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Load and DaCapo benchmarks can be triggered manually in the GitLab pipeline. Results will appear in the Benchmarking Platform UI after completion.

[datadog-prod-us1-4]

More details

The convention keeps the prior Kotlin and Groovy classpath wiring. It also applies this wiring to JVM test suites and test fixtures.

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[AlexeyKuznetsov-DD]

Nice!

[bric3]

/merge

[gh-worker-devflow-routing-ef8351]

View all feedbacks in Devflow UI.

2026-08-28 12:53:26 UTC ℹ️ Start processing command /merge

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2026-08-28 12:53:30 UTC ℹ️ MergeQueue: pull request added to the queue

The expected merge time in master is approximately 1h (p90).

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2026-08-28 14:38:52 UTC ℹ️ MergeQueue: This merge request was merged