Migrate Java 25 concurrent smoke tests

[AlexeyKuznetsov-DD]

What Does This Do

Migrates the Java 25 concurrent smoke tests from Groovy/Spock to JUnit 5 Java and adds shared base classes to support Java smoke-tests migration .

Motivation

Removes the module's Java 8-only Groovy compiler workaround while keeping the broader Groovy migration incremental.

Additional Notes

• Uses Awaitility for trace polling and a Java 25 toolchain.
• Validated with the Java 25 concurrent smoke suite.

[datadog-prod-us1-4]

More details

Migration from Groovy/Spock to JUnit 5 Java passes validation. The Java smoke tests are functionally equivalent to the Groovy originals with improved null safety (Optional return types, Objects.equals) and stricter span count assertions that match the expected @WithSpan annotations in test applications. Removed Java 8-only Groovy compiler workaround cleanly.

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_{📊 Validated against 5 scenarios · Open Bits AI session}

_{🤖 Datadog Autotest · Commit 4738d4a · What is Autotest? · Any feedback? Reach out in #autotest}

[datadog-prod-us1-4]

🎯 Code Coverage (details)
• Patch Coverage: 100.00%
• Overall Coverage: 57.03% (-0.01%)

_{This comment will be updated automatically if new data arrives.
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[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	13.97 s	13.95 s	[-0.7%; +0.9%] (no difference)
startup:insecure-bank:tracing:Agent	12.99 s	13.05 s	[-1.4%; +0.5%] (no difference)
startup:petclinic:appsec:Agent	17.00 s	16.88 s	[-0.3%; +1.7%] (no difference)
startup:petclinic:iast:Agent	16.97 s	17.00 s	[-1.1%; +0.7%] (no difference)
startup:petclinic:profiling:Agent	16.89 s	16.78 s	[-0.3%; +1.6%] (no difference)
startup:petclinic:sca:Agent	17.04 s	16.89 s	[-0.3%; +2.0%] (no difference)
startup:petclinic:tracing:Agent	16.06 s	16.14 s	[-1.5%; +0.4%] (no difference)

Commit: 4738d4a9 · 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.

[typotter]

lgtm for flagging. thanks!