Jev is a new model from TypeSafe that answers typed questions about your content. You send it some text and the decisions you need. It returns a probability, a choice, or a score instead of a paragraph. That makes it a natural fit for the decisions your code already has to make. Is this ticket urgent? Which team should own it? Which model should answer this prompt?

In this episode, Dan and DaShaun talk about why this matters for Java and Spring developers. Most of us have been asking a chat model to make a decision and then parsing prose to get the answer out. Jev gives you a typed answer you can branch on, with a confidence you can check. Dan shares what he learned getting it running in Java and Spring Boot, and the two of them talk through where a decision model fits next to Spring AI and where it does not.

Then it is your turn. Bring your questions about Jev, Spring Boot 4, Spring AI, or anything else in the Spring ecosystem. We will answer them live.

Show Notes

• Introducing System One Models & Jev
• Spring AI and TypeSafe Jev: Fast, Cheap, Structured Decisions
• spring-ai-typesafe on GitHub
• Getting Started with Jev in Java and Spring Boot
• jev-spring-boot-starter
• How Spring Boot 4 Starters Actually Work (I Built One for Jev)
• It's Not an LLM, So What Does It Do? 3 Real Apps I built with Jev
• spring-ai-model-router
• Spring release calendar
• I Publish My Podcast with Claude Code and Skills
• Fundamentals of Software Engineering
• S5E23 - Java 27 Release Party with Billy Korando

The show:

• springofficehours.io - episodes, schedule, community
• Spring Developer on YouTube - join us live every Monday
• Dan Vega
• DaShaun Carter
• The Spring Blog - the news we cover each week