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Issue title

JS: weak Math.random for crypto

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Pick exactly which findings appear in the issue body. By default the top 5 are included. Uncheck noise, check what matters.

Top 5 (default)
Severity Rule Title File:line
CRIT SEC101 [SEC101] Unsafe Java object deserialization (ObjectInputStream): Java ObjectInputStream d… src/demo/share/jfc/Stylepad/Stylepad.ja…:297
MED CFG006 [CFG006] Missing .gitignore: No .gitignore file. Risk of committing secrets and build art… —
MED SEC123 [SEC123] Production stack trace / debug output exposed: Debug mode left on in production … src/demo/share/jfc/SwingSet2/SwingSet2.…:125
MED SEC087 [SEC087] JS: weak Math.random for crypto: Math.random() is not cryptographically secure; … src/demo/share/jfc/J2Ddemo/java2d/demos…:64
MED SEC087 [SEC087] JS: weak Math.random for crypto: Math.random() is not cryptographically secure; … src/demo/share/jfc/J2Ddemo/java2d/demos…:321
LOW AIC003 Duplicated implementation block across source files src/hotspot/cpu/aarch64/gc/z/zBarrierSe…:56
LOW AIC003 Duplicated implementation block across source files src/hotspot/cpu/aarch64/gc/shenandoah/s…:422
Reset to top 5 7 findings available (after auto-suppression of test files + won't-fix)

Issue body (markdown)

## Code-quality scan: `openjdk/jdk`

**Score: 77/100 (B-)**  ·  7 findings  ·  scanned 2026-05-18 04:28 UTC  ·  86,664 LOC

| Severity | Count |
|---|---|
| CRITICAL | 1 |
| HIGH | 0 |
| MEDIUM | 4 |
| LOW | 2 |

📊 [Full filterable report](https://repobility.com/scan/9503248f-8456-4a2a-9c49-8221481cc730/)  ·  ![scorecard](https://repobility.com/scan/9503248f-8456-4a2a-9c49-8221481cc730/report.png?v=1779078525-s2)

### Top findings

1. **CRITICAL** `SEC101` — Unsafe Java object deserialization (ObjectInputStream)
   `src/demo/share/jfc/Stylepad/Stylepad.java:297` · A08:2021 Software & Data Integrity Failures
2. **MEDIUM** `CFG006` — Missing .gitignore
3. **MEDIUM** `SEC123` — Production stack trace / debug output exposed
   `src/demo/share/jfc/SwingSet2/SwingSet2.java:125` · A09:2021 Security Logging & Monitoring Failures
4. **MEDIUM** `SEC087` — JS: weak Math.random for crypto
   `src/demo/share/jfc/J2Ddemo/java2d/demos/Paint/GradAnim.java:64`
5. **MEDIUM** `SEC087` — JS: weak Math.random for crypto
   `src/demo/share/jfc/J2Ddemo/java2d/demos/Composite/FadeAnim.java:321`

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**Security note**: this issue is public. If any flagged finding is a real, exploitable vulnerability, please redirect to your `SECURITY.md` policy or open a [private security advisory](https://docs.github.com/en/code-security/security-advisories/guidance-on-reporting-and-writing-information-about-vulnerabilities/privately-reporting-a-security-vulnerability) instead. We're happy to close this and re-submit privately.

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_Filed automatically. Close this issue if not useful — we won't refile. Full report: https://repobility.com/scan/9503248f-8456-4a2a-9c49-8221481cc730/_
Already filed
This repo publishes a SECURITY.md policy and the scan contains 1 Critical/High security finding(s). Public issue filing would violate coordinated disclosure. Submit privately via the project's security reporting channel.
Megaproject â high spam risk
Could not determine 'openjdk/jdk' star count (GitHub API rate-limited or unreachable). When in doubt about repo size, prefer opening a focused PR or a discussion rather than an issue.
Already filed
4/7 findings (57%) on this scan are already flagged as test-file, won't-fix, or suppressed. The scan is too noisy to file as a single issue. Curate down to specific actionable findings, or address the FP source first.
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