User repository on GitHub
Community-maintained Java SDK for the TypeSafe AI System One (Jev) API. Not an official TypeSafe product.
- Forks
- 1
- Last pushed
- Updated Sep 2026
Repo stats from the GitHub API, cached Oct 2026.
CommunityJev Repos & SDKs
TypeSafe AI Java
JVM SDK for the TypeSafe System One API with a pure-Java core, Kotlin DSL, Spring Boot starter, and Spring AI bridge, speaking the System One wire contract across hosted and self-hosted backends.
- Stars
- 4
- Language
- Java
- Published by
- Community
- Author
- jamilxt
- Last verified
- Oct 2026
About this project
Community-maintained Java SDK for the TypeSafe AI System One API. Not an official TypeSafe product. System One models answer typed questions about a piece of state. Ask whether something is true and you get a probability. Ask it to pick from a list and you get the option plus a distribution over the alternatives. They do not write prose, so nothing here parses sentences. The answers arrive as numbers your code branches on.
Quoted from the project's README. Read the full README.
Works forJev for Classification
Used inJev for Software & DevTools
- Languages
- Java
Highlights
- Typed noul, choice, and score questions return probabilities and confidence that code branches on directly.
- Retries on 408, 429 and 5xx with backoff plus jitter honoring Retry-After inside a 30s per-call budget.
- Typed exception hierarchy including authentication and rate-limit exceptions with retryAfterMs.
- Bring-your-own transport and retry policy plus env-driven base URL for gateway and local endpoints.
Watch out
Community-maintained and not an official TypeSafe product; requires Java 25 with Spring Boot 4.1 and Spring AI 2.0 for the integration modules. Copy reviewed against the repository README on 2026-10-04, not from running it.
Questions about this entry
Short answers drawn from the linked project or page.
This is the JVM counterpart: a pure-Java core with Jackson only, idiomatic Kotlin extensions, an auto-configured Spring Boot starter, and a Spring AI bridge. Official SDKs cover Python and JavaScript; this covers Java and Kotlin services.
Jev hosted by default, Jev through Vercel AI Gateway or OpenRouter via baseUrl plus gateway model id, self-hosted Laya decision weights via laya-serve, and OpenJev-compatible servers. Model discovery is runtime through listModels, not hardcoded.
Set TYPESAFE_API_KEY or switch hosted versus local with TYPESAFE_BASE_URL and fromEnv, no code change. Requests default to jev-latest and accept a pinned model per client or per request, which is what you want once thresholds are tuned.
Yes. A prompt-guard advisor screens every prompt with one System One call before the chain runs with block and review thresholds, and a ChatModel adapter drops any System One backend into pipelines accepting ChatModel with the typed result in response metadata.
typesafe-ai-java-core carries the client, typed questions and answers plus retries on Jackson alone; typesafe-ai-java-kotlin adds an idiomatic Kotlin DSL; the spring-boot-starter auto-configures a TypeSafeClient bean; and typesafe-ai-java-spring-ai bridges any System One model into Spring AI. All four are published to Maven Central.
It retries 408, 429 and 5xx responses with a 0.5 to 5 second backoff with jitter, honours Retry-After, and enforces a 30-second total budget per call, with a typed exception hierarchy including a TypeSafeRateLimitException that carries retryAfterMs().
Java 25, compiled with the JDK 25 toolchain. The integration modules additionally target Spring Boot 4.1 and Spring AI 2.0, while the pure-Java core has only Jackson as a dependency.
More Jev resources like this
6GitHub stars
Idiomatic Java 17 and later client for Jev with one-off evaluate calls, reusable JevRequest builders, async support, and structured rubric helpers.
Jev Repos & SDKs#community#jevbest#catalog-import
Community
Olti1947/jev-javaJava
Olti1947/jev-javaJava5GitHub stars
Unofficial Java SDK that defines Choice, Noul, and Score questions in code and submits them together for typed answers instead of parsed text.
Jev Repos & SDKs#community#awesomejev#catalog-import
Community
gudcks0305/jev-javaJava
gudcks0305/jev-javaJava6GitHub stars
An unofficial Java 21 client for the Jev decision API that replaces maps with records and sealed types, so a malformed choice, score or noul question fails to compile instead of coming back as a 422.
Jev Repos & SDKs#community#jevbest#catalog-import
Community
luigivis/jev-sdk-javaJava
luigivis/jev-sdk-javaJava2GitHub stars
A Java and Maven framework that lets natural language route to existing tinystruct @Action methods: Jev picks the action and its arguments as a probability distribution over options you supply, and the dispatcher then runs, holds for confirmation, or refuses.
Jev Repos & SDKs#community#awesomejev#catalog-import
45GitHub stars
Go SDK plus a pipeline-friendly CLI for typed decisions, covering single questions, batched question maps, retries, and line-oriented filtering over stdin.
Jev Repos & SDKs#community#jevbest#catalog-import
Community
mattn/go-jevGo
mattn/go-jevGo16GitHub stars
Swift library and CLI for asking Jev typed Choice, Noul, and Score questions from Apple platforms, with answers returned alongside calibrated probabilities in one parallel request.
Jev Repos & SDKs#community#jevbest#catalog-import
Community
d-date/swift-jevSwift
d-date/swift-jevSwiftFrom the Jev guides
Original write-ups on what this entry is for.
Closed weights have not stopped the ecosystem from rebuilding the shape in the open. API-compatible servers, retrained heads on small models, and inference-time tricks that skip generation entirely.
Jev Repos & SDKs#open-models#research#local
Read article
From the Jev community
Posts from builders shipping with Jev right now.