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What the experimental channel does
Seed4J is an open-source modular code generator focused on Java and Spring Boot, with an emphasis on clean and hexagonal architecture (Seed4J). Its CLI applies and manages Seed4J modules and generates projects using selected modules and features.
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The CLI’s default npm channel is stable. The separately operated experimental channel packages selected snapshots that follow Seed4J’s mutable main branch. This gives developers a way to try newer upstream changes through the CLI rather than cloning Seed4J and running its main branch directly. That motivation is described by Renan Franca in his September 18, 2026 article; it is not a claim of official maintainer endorsement or guaranteed reliability (Following Seed4J’s Main Branch with Seed4J CLI Experimental).
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Install the channel you intend to use
The CLI documentation requires Java 25 or higher on PATH. The npm launcher runs the CLI’s Spring Boot JAR using the first java executable found there. Node.js 22 or higher is also required by the npm launcher and development toolchain. These are CLI prerequisites; projects generated by Seed4J can have their own runtime and toolchain requirements (Seed4J CLI repository).
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- For stable: install the default channel with
npm install -g seed4j-cli. - For experimental: explicitly opt in with
npm install -g seed4j-cli@experimental. - To try stable without a global install: run
npx --package seed4j-cli seed4j --help. - Check the installed CLI: run
seed4j --helpfor available commands orseed4j --versionfor version and provenance details.
Installing without a channel tag uses stable; experimental is not selected automatically. The README says the Java requirement applies to the CLI itself, not necessarily to projects it generates.
How experimental snapshots are selected and published
Experimental publication is conditional, not a guaranteed weekly release. Franca’s September 18, 2026 account describes a process in which a publisher selects a Seed4J main commit, checks that upstream CI passed and that the revision qualifies for a snapshot, then builds and verifies eligible snapshots. The described checks include lint and Maven clean verify; snapshots are published to Sonatype’s Central Portal snapshot repository. A proposed dependency update is tested on the CLI’s experimental branch, and an npm release is considered only after qualification and the necessary checks (Renan Franca’s account of the process).
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The account says a revision published less than 60 days earlier is skipped for a new snapshot publication check, while an older revision may qualify for a retention refresh. If the commits do not qualify or required checks fail, a new npm version may not be published. Franca summarizes the cadence as: “Every Monday, a new experimental version of Seed4J CLI can be released.” The word “can” matters: Monday is an opportunity for a release, not a promise that one will appear.
Stable and experimental compared
| Consideration | Stable | Experimental |
|---|---|---|
| Default and intended use | Default CLI channel; recommended for production generation in the CLI project documentation. | For deliberate early adopters who want to try selected changes from Seed4J main; not recommended for production generation. |
| Freshness and provenance | Uses a stable CLI release; the cited documentation does not describe it as tracking upstream snapshots. | Follows selected Seed4J main snapshots; use seed4j --version to inspect the included snapshot and commit where shown. |
| Release predictability | Stable is the default release channel. | A release may be evaluated for Monday publication, but validation and eligibility checks can prevent a new npm version. |
| Retention | Not stated in the cited sources. | Snapshot retention is limited; older revisions may be eligible for a refresh under the described process. |
| Feature availability | Not stated in the cited sources. | The seed4j-extension generation module is reported unavailable in this channel. |
| Maintainer support | Not stated in the cited sources. | The integration is described by its author as experimental and without Seed4J maintainers’ endorsement or support. |
Read the version output as provenance, not a live guarantee
In output captured on September 18, 2026, stable (seed4j-cli@latest) showed Seed4J CLI v0.1.1 with Seed4J 2.2.0. Experimental showed Seed4J CLI v0.2.0-experimental.3 with Seed4J 2.2.1-main.20260907.055800.4eebd07bce14-SNAPSHOT and upstream commit 4eebd07bce14c9a6ac70bace157fcc616133e950. These are dated examples, not current-version claims: npm tags can move, and the cited sources do not establish what the experimental tag resolves to now.
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When reporting an issue or comparing generated output, include the complete output of seed4j --version. The commit identifier can distinguish the upstream snapshot under discussion. This helps identify a reproducible version; it does not mean Seed4J maintainers support the unofficial experimental integration.
When to choose experimental
Use experimental when you deliberately want to evaluate newer Seed4J changes and can tolerate a snapshot channel’s limited retention, possible feature gaps, and conditional publishing. Keep stable for production generation when predictability matters. The CLI repository is the source for installation and prerequisites; Franca’s article describes the experimental process and its stated support boundaries.
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