Legit.Show measured JEP 401's Security frame at 35/100. Security headers present: X-Frame-Options, X-Content-Type-Options. No Content-Security-Policy and no HSTS. Served over HTTPS with a valid certificate.

How does Legit.Show measure JEP 401?

Legit.Show scores seven frames — Performance, Accessibility, Security, Privacy, Reliability, Standards and Discoverability — deterministically from the public surface (URL, HTTP headers, real Lighthouse), with no LLM in the scoring path. See legit.show/methodology.

Developer Tools

JEP 401

JEP 401 proposes value classes and objects as a preview feature for Java.

52/100

7-Frame production-readiness — according to Legit.Show

Is JEP 401 production-ready?

Legit.Show measured JEP 401 at 52 out of 100 on its 7-Frame production-readiness benchmark (public-surface assessment). Its strongest frame is Reliability (100); its weakest is Privacy (0). Every frame is measured deterministically from the public surface — exactly what was observed is shown below.

The 7 Frames

Performance — 91/100
Accessibility — 57/100
Security — 35/100
Privacy — 0/100
Reliability — 100/100
Standards — 69/100
Discoverability — 15/100

What we measured

Security headers present: X-Frame-Options, X-Content-Type-Options.
No Content-Security-Policy and no HSTS.
Served over HTTPS with a valid certificate.
Lighthouse performance score 91/100 (191 ms to first byte).
Returns a proper 404 for unknown routes.
3 of 3 sampled routes reachable.
No privacy policy found.
Sets cookies / loads scripts with no consent prompt.

Who it's for

Java developers · Library maintainers · JDK contributors · Performance-focused teams

Visit JEP 401 → · How this was measured →