Fix NullPointerException in Exception Replay

[jpbempel]

What Does This Do

fingerprint can be null in rare occasions

Motivation

Additional Notes

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Jira ticket: DEBUG-5675

[datadog-prod-us1-3]

More details

Null fingerprint check correctly handles a rare but real edge case in exception replay where circular exception chains or digest algorithm failures cause Fingerprinter.fingerprint() to return null. The fix is minimal, focused, and prevents a NullPointerException without changing behavior for normal exceptions. Existing tests (FingerprinterTest.innerInfiniteLoop) confirm this code path is reachable.

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[datadog-prod-us1-3]

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Bits Code status: ✅ Done

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[datadog-prod-us1-3]

🎯 Code Coverage (details)
• Patch Coverage: 0.00%
• Overall Coverage: 74.45% (+17.27%)

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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	13.89 s	13.91 s	[-0.9%; +0.6%] (no difference)
startup:insecure-bank:tracing:Agent	12.88 s	12.91 s	[-0.8%; +0.3%] (no difference)
startup:petclinic:appsec:Agent	16.73 s	16.70 s	[-0.9%; +1.3%] (no difference)
startup:petclinic:iast:Agent	16.84 s	16.99 s	[-1.6%; -0.2%] (maybe better)
startup:petclinic:profiling:Agent	16.69 s	16.86 s	[-2.3%; +0.3%] (no difference)
startup:petclinic:sca:Agent	16.92 s	16.05 s	[+1.2%; +9.7%] (significantly worse)
startup:petclinic:tracing:Agent	16.02 s	16.22 s	[-1.9%; -0.6%] (maybe better)

Commit: 19107763 · CI Pipeline · Benchmarking Platform UI

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[dd-octo-sts]

/merge

[gh-worker-devflow-routing-ef8351]

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2026-07-22 05:15:38 UTC ℹ️ Start processing command /merge

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2026-07-22 05:15:43 UTC ℹ️ MergeQueue: pull request added to the queue

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

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2026-07-22 06:14:56 UTC ℹ️ MergeQueue: This merge request was merged