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Unofficial Java SDK for TypeSafe Jev and Vercel AI Gateway, with Spring Boot and WebClient support
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CommunityJev Repos & SDKs
Jev Java — gudcks0305
Unofficial Java SDK that defines Choice, Noul, and Score questions in code and submits them together for typed answers instead of parsed text.
- Stars
- 5
- Language
- Java
- License
- MIT
- Published by
- Community
- Author
- gudcks0305
- Last verified
- Oct 2026
About this project
Unofficial Java SDK for turning application state into typed Jev judgments through TypeSafe, OpenRouter, Vercel AI Gateway, or Cloudflare. Define Choice, Noul, and Score questions in Java, submit them together, and receive typed results instead of parsing generated text. Jev Java requires Java 17 or newer. The plain SDK uses JDK HttpClient and Jackson 2; Spring is optional. This project is not affiliated with TypeSafe AI, Vercel, or OpenAI. If Jev Java helps your project, consider giving it a star on GitHub ⭐.
Quoted from the project's README. Read the full README.
Works forJev for Classification
Used inJev for Software & DevTools
- Languages
- Java
Highlights
- Batches Choice, Noul, and Score questions in one evaluate call with typed answers and retained probabilities.
- Maps annotated Java records to native questions, with explicit boolean thresholds and nested-record support.
- Ships provider modules for TypeSafe, OpenRouter alpha Decisions API, Vercel Gateway, and Cloudflare AI.
- Uses baseUrl for an origin prefix versus endpoint for a complete URL, without changing auth or wire format.
Watch out
Requires Java 17 or newer with JDK HttpClient and Jackson 2, and free-text fields plus generic or recursive records fail before HTTP; Spring is optional. 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.
You declare questions with ChoiceQuestion, NoulQuestion, and ScoreQuestion and get typed answers with probabilities and confidence in one evaluate call. There is no generated prose to parse, and a missing distribution or confidence stays absent rather than being invented.
Depend on the provider module you use: jev-typesafe for TypeSafe, jev-openrouter for OpenRouter, jev-cloudflare for Cloudflare, or jev-vercel for the evaluation-model adapter, plus the Spring starters if needed. Each brings in jev-core, so do not add it separately.
Keep the exact question instance you passed to evaluate, because result.answer checks identity to preserve the generic answer type. Record schemas offer the same idea with annotations plus explicit boolean thresholds.
Use blocking evaluate only from blocking code and close reusable clients on shutdown. For async work there is evaluateAsync with a cancellable future, plus a Reactor facade with cancellation propagation.
Java 17 or newer with JDK HttpClient and Jackson 2; Spring is optional. Clients build from a builder that reads an environment variable per provider: TYPESAFE_API_KEY for TypeSafe, OPENROUTER_API_KEY for OpenRouter, AI_GATEWAY_API_KEY for Vercel. The project is published on Maven Central under io.github.gudcks0305 and is not affiliated with TypeSafe AI, Vercel, or OpenAI.
Modules cover TypeSafe, OpenRouter's alpha Decisions API, OpenAI Decisions, Cloudflare AI's typesafe/jev, and Vercel AI Gateway, in plain Java and Spring Boot variants. Version 0.3.0 adds OpenAI Decisions with text and image inputs, typed string and boolean choices, scoring, per-question refusals and request-level safety identifiers, while the existing Jev question and record interfaces stay available.
There are two distinct knobs. baseUrl changes the origin and path prefix and still appends the provider's endpoint suffix, such as /v1/systemone for TypeSafe, while endpoint uses the complete URL exactly as supplied including path and query. Do not configure both. Either option applies across all four clients and changes neither the provider's authentication nor its wire format.
Other listings of this project
Forks and copies of this project in the directory. This entry is the canonical one.
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