Alginte 0.12.0 Beta

Released 2026-09-15.

Alginte is in beta (0.x): configuration keys, the topology export format, and APIs may change between releases; breaking changes are called out in release notes with migration guidance. 0.12.0 contains no breaking changes. Two deploy checks are stricter, listed under Behaviour changes below; both refuse topologies that failed at runtime before.

0.12.0 is the release for the JVM-native builder: run Alginte as a single JAR, write expressions from a reference that names what every field can see, call your own Java from them, and reset a stopped stream to any input position. Each item links to its documentation.

New

• The standalone JAR is downloadable: one file, the backend and the web UI, from the community repo's GitHub Releases with a SHA-256 beside it. Requires Java 25; the Docker image stays the recommended channel.
• The SpEL reference and cookbook: what every expression field can see, operator by operator; what each serde hands you for key and value; windowed keys; and eleven recipes with the record before and after, each one pinned by the fidelity corpus.
• Custom functions, the worked example: a static Java method registered as a #function, from the class to the container, with the four fail-fast messages explained.
• Reset: move a stopped stream to an input position — earliest, latest, a timestamp or a per-partition offset — and start it, keeping its definition and its registration. The modal shows the server's plan before you confirm.
• The empty observed table says what would fill it: the orphan internal topics the cluster holds and the DESCRIBE grant on groups that would let Alginte name their applications.

Behaviour changes

• The editor's roots follow the runtime: an aggregate initializer has no record in scope and Map Values sees only the value. Both were accepted by the editor before and failed deployed; both are now rejected with a hint.
• A windowed key at a sink is refused: after a window the key is Kafka's Windowed object, which no sink key serde can write. The canvas badges the sink while you draw and the deploy is refused, both naming the fix — a Select Key or a Map that unwraps it (validation as you build).

Fixes

• The tumbling-window example in the documentation sank its windowed key through a String serde and never produced a record; it now unwraps the key with a Select Key.

For operators

• What one runtime token may push is bounded: pushes per second, snapshots and events per push, and applications per token, each with a refusal that names the limit. Four new alginte.runtime.max-* properties on the configuration page; the defaults leave room for a thousand reporting instances on one token.
• The JAR checks for updates the way the image does, once a day at most, as an anonymous fetch of a small manifest; set alginte.update-check.url to empty to switch it off.

Get it

docker pull alginte/alginte:latest

Or the JAR (SHA-256), run with Java 25. Full install guide in the documentation — or try the playground: one command, no Kafka needed.