JDK 27 is out: should you upgrade, and which of the 9 JEPs matter

The short answer

JDK 27 reached general availability on 15 September 2026 with nine JEPs. It is a six-month release, not a long-term one: Oracle lists Java 25 as the current LTS and Java 29 as the next, planned for…

Status: GA on 15 Sep 2026, per the OpenJDK project page

Finished features: G1 default (523), compact headers (534), post-quantum TLS (527), JFR redaction (536)

Previews and incubator: structured concurrency, primitive patterns, lazy constants, PEM, Vector API

Support: Oracle's table gives Java 27 Premier Support to March 2027 and none after; Java 25 runs to September 2030