This Week in Spring - January 13th, 2026

Hi, Spring fans, and welcome to another installment of This Week in Spring! It's the 13th of January, 2026, and it's been quite the week indeed! Let's dive right into it! Nobody, and I mean nobody , asked. So I put together a video on how to use Spring WS to build SOAP-based services in 2026. Hey...

This Year in Spring – December 30th, 2025

Hi, Spring fans! Can you believe it? It's already the 30th of December! I celebrated Christmas with my family in Los Angeles, then we jumped on a flight headed for Southeast Asia to ring in the New Year with more friends and family. I'm sitting at a café in the sweltering city of Kuala Lumpur,...

This Week in Spring – December 16th, 2025

Hi, Spring fans! Welcome to another installment of This Week in Spring! And what a week it’s been! We’ve got around nine shopping days ’til Christmas, and the New Year is almost here! Things are moving so quickly and the Spring community is no exception! Let's dive into this week's wonderful...

This Week in Spring - December 9th, 2025

Hi, Spring fans! Welcome to another installment of This Week in Spring! I am in lovely New Jersey, the Garden State , as I write this and I spent most of the last week in New Orleans. It's been a busy week in the Spring community and beyond and so you know what that means? There's a ton of stuff ...

This Week in Spring - December 2nd, 2025

Hi, Spring fans! Welcome to another installment of This Week in Spring. By mistake, I inadvertently published older content in this installment, then tried to fix it and ended up re-publishing the same content. And, what's worse, I somehow ended up deleting the draft I had written for this...

Beyond JSON: Converting Spring AI Tool Response Formats to TOON, XML, CSV, YAML, ...

JSON is the go-to format for LLM tool responses, but recent discussions around alternative formats like TOON Token-Oriented Object Notation claim potential benefits in token efficiency and performance. While the debate continues—with critical analyses pointing to context-dependent results—the...

LLM Response Evaluation with Spring AI: Building LLM-as-a-Judge Using Recursive Advisors

The challenge of evaluating Large Language Model LLM outputs is critical for notoriously non-deterministic AI applications, especially as they move into production. Traditional metrics like ROUGE and BLEU fall short when assessing the nuanced, contextual responses that modern LLMs produce. Human...

Create Self-Improving AI Agents Using Spring AI Recursive Advisors

The Spring AI ChatClient offers a fluent API for communicating with an AI model. The fluent API provides methods for building the constituent parts of a prompt that gets passed to the AI model as input. Advisors are a key part of the fluent API that intercept, modify, and enhance AI-driven...

AWS Bedrock Prompt Caching Support in Spring AI

In our previous blog post about Anthropic prompt caching, we explored how prompt caching dramatically reduces API costs and latency by reusing previously processed prompt content. We introduced Spring AI's five strategic caching patterns for Anthropic Claude models and showed how they automatical...

Introducing Spring AI Agents and Spring AI Bench

I'd like to introduce two new projects that are part of the Spring AI Community GitHub organization: Spring AI Agents, and Spring AI Bench. These two projects focus on using agentic coding tools—tools you likely already have in your enterprise. In 2025 AI coding agents have matured to the point...

Prompt Caching Support in Spring AI with Anthropic Claude

Large language model API costs can accumulate quickly when applications repeatedly send the same prompt content. A typical scenario: you're building a document analyzer that includes a 3,000-token document in every request. Five questions about that document means processing 15,000 tokens of...

This Week in Spring - October 14th, 2025

Hi, Spring fans! Welcome to another installment of This Week in Spring! I'm in Boston and New York city and Bulgaria and Poland this week, but I'm still hyped about last week's amazing Devoxx Belgium event! There are a ton of videos to look at, and I'll include just some of them here. So, without...

This Week in Spring - October 7th, 2025

Hi, Spring fans! How're you doing this fantastic October afternoon? I'm on a train returning from Frankfurt, Germany, where I spoke at the Cloud Foundry Day Frankfurt event about how awesome it is to build an application with Spring Boot and Cloud Foundry. Yesterday I was in Antwerp, Belgium, and...

This Week in Spring: September 30th, 2025

Hi, Spring fans! As I write this I am about to board a flight for Colorado for the amazing Dev2Next conference! I'll be in Antwerp, Beglium for the amazing Devoxx event next week, and I'll be speaking at the Amsterdam JUG with James Ward on the Thursday after that, too! If you're around, be sure ...

Securing MCP Servers with Spring AI

Model Context Protocol, or MCP for short, has taken over the AI world. If you've been following our blog, you've probably read the introduction to the topic, Connect Your AI to Everything: Spring AI's MCP Boot Starters. The security aspects of MCP have been evolving fast, and the latest version o...

Connect Your AI to Everything: Spring AI's MCP Boot Starters

The Model Context Protocol MCP standardizes how AI applications interact with external tools and resources. Spring joined the MCP ecosystem early as a key contributor, helping to develop and maintain the official MCP Java SDK that serves as the foundation for Java-based MCP implementations...

This Week in Spring - September 9th, 2025

Hi, Spring fans! Welcome to another installment of This Week in Spring! I am home, ensconced in my studio here in somewhat sunny San Francisco, California, relaxing and trying to catch up on stuff I missed. As always, there's a ton! So let's dive right into it. Some of the amazing features that...

ai.driftkit:driftkit-context-engineering-spring-ai-starter (>=0.6.0 <=0.8.7), ai.driftkit:driftkit-context-engineering-spring-boot-starter (>=0.5.0 <=0.8.7) +7649 more potentially affected by CVE-2025-8885 via org.bouncycastle:bcprov-jdk18on (>=1.71 <=1.77)

org.bouncycastle:bcprov-jdk18on MAVEN version =1.71, =0.6.0, =0.5.0, =0.7.0, =0.7.0, =0.5.0, =0.8.3, =0.8.3, =0.8.3, =0.5.0, =0.5.0, =1.4.0, =1.2.0, =1.2.0-alpha07, =2023.12.01.210510-f61f157, =2023.12.01.210510-f61f157, =2025.05.12.160240-6152e21 and more Source cves: CVE-2025-8885 Source...

This Week in Spring - July 1st, 2025

Hi, Spring fans! Welcome to another installment of This Week in Spring! It's July!! This week, I'm on PTO, and as always, I'm looking for good reading material on the plane ride over for my holiday. Thank goodness for the ever-vibrant and awesome Spring community; there's tons of stuff to dive...

This Week in Spring - June 24th, 2025

Hi, Spring fans! Welcome to another installment of This Week in Spring! We're in the middle of June already! And you know what that means? Warm weather, fun, and of course: the amazing SpringOne event in lovely Las Vegas, NV! The content catalog went live today! I'll be there doing, among other...