Java SE 27 Platform JSR 402

This is the primary web page for JSR 402, the Platform JSR for Java SE 27.

The original JSR submission may be found on the official JCP page.

Expert Group

2025/12 Expert Group formation

2026/06 - 2026/08 Public Review

2026/09 Final Release

Draft releases of the Specification and Reference Implementation may be regularly accessed from the links provided below.

There are three mailing lists:

java-se-spec-experts is the Expert Group (EG) list. Only EG members may subscribe and post to this list, but the archives are public.
java-se-spec-observers is for those who wish to monitor and, perhaps, discuss the EG's progress. Messages sent to the primary EG list are automatically forwarded to this list. Anyone may subscribe to this list, and any subscriber may post. EG members are under no obligation to follow the traffic on this list.
java-se-spec-comments is for sending comments, suggestions, and other feedback directly to the EG. Only EG members may subscribe to this list, but anyone may post, although posts are moderated in order to prevent spam. The archives are public. The EG will read all messages sent to this list.

JEP Dashboard lists all JDK Enhancement Proposals (JEPs) for this release which change the Platform Specification. They have a Scope of "SE". JEPs in the first filter (blue title bar) corresponding to Status of "propose to target", "targeted", "integrated", "complete", or "closed/delivered" are expected in this release.
CSR Dashboard lists all Compatibility & Specification Review (CSR) requests for this release which affect this Specification (Scope = "SE"). CSRs in the first two filters (Status of "proposed", "finalized", "pended", or "provisional") may be in this release. The third filter (green title bar) containing CSRs with Status of "closed/approved" are expected. Status descriptions may be found on the Fields of a CSR page.
Latest Specification will reference the latest working version of the Platform Specification.
Latest JavaDoc API and Diffs will contain references to the JavaDoc API from the most recent build. Diffs from the most recent build and from JSR 401 (Java SE 26) will be provided.
Latest Early-Access Build will reference --> the weekly promoted build of the OpenJDK source which will become the Reference Implementation.
Issues describes open and resolved EG concerns.

Last update: 2025/12/02