# PR#20: Temurin 25 for All werk Repositories

> **WARNING:** This document describes only the change applied in this PR.
> It may already be outdated once the next PR is merged.
> Historic PR documentation is not maintained along with new PRs; treat it as a snapshot.

## Problem

Each werk repository chooses its JDK and its Java runtime on its own, and each one differently:

- werkator, werkregie and the statistics service of werkrevisor pin Temurin 21 and download it with Foojay,
  in two different versions of the Foojay plugin.
- werkcrappit and werkbaum accept any JDK 21; werkprobe accepts any JDK and emits Java 17 bytecode.
- The build sandbox of Werkator has Debian's OpenJDK 21, whose jlinked runtime does not start on Hostsharing hosts.
- werkbaum runs on a full JDK in the home of its host, the others on a jlinked runtime.

`mi` decided on 2026-10-11 to choose one JDK and one runtime for all werk repositories.

## Non-Goals

- No switch of a repository yet, also not of werkregie; each one gets a PR of its own.
- No change of Werkator's build environment yet.

## Solution

- `doc/adrs/0001-2026-10-11.temurin-25.md` records the decision, the measurements and the order of the rollout.
- `doc/adrs/0000-00-00.adr-template.md`: the ADR template of Werkator.
- Werkbaum: `#ops.jdk` with the rollout steps.
- Version 0.8.1.