Spring AI 2.0 delayed?

[tschut]

Hey team,

I noticed the expected release date for Spring AI 2.0 has been changed to May 28. Previously, I believe it was due end of February.

Of course, it's completely up to you when to release this. However, Spring AI 2.0 not being available means we can't upgrade certain applications to Spring Boot 4, so this means we're on 3.x longer while we wait for Spring AI 2.0.

From this follow two questions:

1. Can you give some insight into the reason for the delay? This would help us to explain it internally too.
2. Is there any chance of delivering Spring Boot 4 support sooner?

[ra-lukas]

You can temporarily upgrade to Spring Boot 4 using 2.0.0-M2. If you can't release using a milestone version due to company restrictions, it will at least allow you to progress with the code and test along the way.

[breun]

I see that https://github.com/spring-projects/spring-ai/milestone/24 mentions this bullet point:

Major API redesign and architectural enhancements
Known: Reactive/NonReactive split of ChatClient and downstream impacts
Unknown: TBD

Are the major API redesign and architectural enhancements already part of the 2.0.0-M2 release, or should we still expect some big changes in the API and architecture in the upcoming releases?

[tzolov]

Hi @tschut, thanks for the question.

The move to May aligns Spring AI with the Spring release train and gives us time to land several important changes we want to get right before a 2.0 GA:

• API stabilization – we're working through breaking changes now (null-safety, deprecating constructors in favor of builders, consolidating to one flavor per model provider) so the API surface is clean and stable at GA.
• MCP alignment – the MCP Java SDK is evolving quickly, and we're migrating MCP Spring support directly into Spring AI (#5423) as well as moving mcp-annotations to spring-ai.
• Spring Boot 4 / Jackson 3 baseline – this needs to be solid from day one.

You can track the planned work in the 2.0.0-M3 and 2.0.0-M4 milestones.

Regarding Spring Boot 4 support sooner: the milestone releases (M2, M3, M4, …) will already be based on Boot 4, so you can start testing and migrating your applications against those before GA.