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...

Prompt Engineering Techniques with Spring AI

This blog post demonstrates practical implementations of Prompt Engineering techniques using Spring AI. The examples and patterns in this article are based on the comprehensive Prompt Engineering Guide that covers the theory, principles, and patterns of effective prompt engineering. The blog show...

This Week in Spring - January 28th, 2025

Hi, Spring fans! Welcome to another rip-roarin' and exciting installment of This Week in Spring , wherein we look at the amazing week that was in the Spring community. And what a week it's been! In addition to tons of cool tooling and AI related stuff, this week saw the release of the first steps...

Hello DCO, Goodbye CLA: Simplifying Contributions to Spring

The Spring team will be rolling out a simplified contribution process that replaces the requirement to sign a Contributor License Agreement CLA with a Developer Certificate of Origin DCO. The process will start this week with Spring Framework, Spring Security, & Spring Boot and then roll out to t...

Let’s use OpenTelemetry with Spring

Introduction In the dynamic realm of observability, OpenTelemetry is a new set of tools that emerged from the now-deprecated OpenCensus and OpenTracing projects. When it comes to Spring Framework, Spring Boot, Spring Data, and Spring Cloud observability, mature solutions like Micrometer, the de...

Supercharging Your AI Applications with Spring AI Advisors

In the rapidly evolving world of artificial intelligence, developers are constantly seeking ways to enhance their AI applications. Spring AI, a Java framework for building AI-powered applications, has introduced a powerful feature: the Spring AI Advisors. The advisors can supercharge your AI...

Spring Tips: Further, Faster with Spring Boot 3.3

Hi, Spring fans! In this installment we look at ways to make your applications go further, faster, with AppCDS, GraalVM, AOT on the JRE, and Project CRaC coordinate restore at checkpoint springboot java graalvm programming coding...

This Week in Spring - May 21st, 2024

Welcome to another installment of This Week in Spring! It's been yet another amazing and exciting week and with it a bevy of new releases. And of course, in about a week's time, we will find ourselves at Spring IO, ready to show a lot of these new things. Will you be there? I will! Anyway, let's...

A Bootiful Podcast: Marit van Dijk, Jetbrains Developer Advocate

Jetbrains Developer Advocate Marit van Dijk on reading code, IntelliJ IDEA, and more...

This Week in Spring - February 6th

Hi, Spring fans! Welcome to another installment of the rip-roarin' adventure that is This Week in Spring! We've got a lot to look at, as usual, so let's dive right into it! in last week's installment of A Bootiful Podcast, I talked to Gunnar Morling, who created the 1BRC 1 Billion Row Challenge...

A Bootiful Podcast: Spring creator Rod Johnson and Oracle vice president Heather VanCura

Hi, Spring and software fans! In this installment of the show we have Spring creator and investor Rod Johnson and Oracle vice president Heather VanCura on the show to talk about the premise of her new book - Developer Career Masterplan, coauthored with fellow Java luminary Bruno Souza: building...

A Use Case for Transactions: Outbox Pattern Strategies in Spring Cloud Stream Kafka Binder

Other parts in this blog series Part 1: Introduction to Transactions in Spring Cloud Stream Kafka Applications Part 2: Producer Initiated Transactions in Spring Cloud Stream Kafka Applications Part 3: Synchronizing with External Transaction Managers in Spring Cloud Stream Kafka Applications Part ...

Apache Kafka’s Exactly-Once Semantics in Spring Cloud Stream Kafka Applications

Other parts in this blog series Part 1: Introduction to Transactions in Spring Cloud Stream Kafka Applications Part 2: Producer Initiated Transactions in Spring Cloud Stream Kafka Applications Part 3: Synchronizing with External Transaction Managers in Spring Cloud Stream Kafka Applications Part ...

This Week in Spring - August 29th, 2023 - the post SpringOne recovery blog

Hi, Spring fans! Welcome to another installment of This Week in Spring! I'm exhausted. Seriously. Last week was mental. If you need me, I'll be over sipping on a tea... But, before that, there's a ton of things to cover from this last week, as always, and there's no rest for the curious, so let's...

Azure Spring Apps Enterprise – More Power, Scalability & Extended Spring Boot Support

Can you believe Spring is celebrating its 20th anniversary this year? We could not have gotten here without our millions of Spring developers across the globe, thank you! Spring has been an essential tool for Java developers, and it continues to grow and innovate at a fast pace. From the onset,...

A Bootiful Podcast: Java Developer Advocate Billy Korando on the latest and greatest in Java

Hi, Spring fans! In this installment, Josh Long @starbuxman talks to Java Developer Advocate Billy Korando, recorded live from the amazing Spring I/O show in Barcelona, Spain!...

A Bootiful Podcast: Grubhub's Josh Burns on Kotlin, Spring Boot, and more

We're crossing the streams, again! This time Josh Long talks to Grubhub's John Burns twitter: @wakingrufus mastodon: @[email protected] about dogfooding human food, Grubhub's tech stack, and more...

A Bootiful Podcast: James Ward, Kotlin Product Manager at Google

Hi, Spring fans! In this installment Josh Long talks to James Ward, Kotlin Product Manager at Google...

This Week in Spring - April 11th, 2023

Hi, Spring fans! Welcome to another installment of This Week in Spring! As I write this I am in Amsterdam, Netherlands, preparing to speak at the Utrecht JUG tonight along with fellow Java Champion Trisha Gee. We're not speaking together, but instead it's a double header: she'll speak first, then...

A Bootiful Podcast: Spring Integration lead Artem Bilan on the latest in Spring Integration 6

Hi, Spring fans! In this installment Josh Long @starbuxman talks to Spring Integration lead Artem Bilan @artembilan about the latest and greatest in Spring Integration. Spring Integration makes it easier to connect an increasingly larger ecosystem of disparate services and systems. SHOW NOTES: I...

Spring Data JPA introduces query parser!

The Problem One of Spring Data JPA’s handy features is letting you plugin in custom JPA queries through its @Query annotation. This allows some flexiblity because you are still able to offer sort parameters to the consumers of your app. Check out the example below: interface SampleRepository...

A Bootiful Podcast: Google Cloud Java Advocate Aaron Wanjala

Hi, Spring fans! In this installment, Josh Long @starbuxman talks to Google Cloud Java advocate Aaron Wanjala @ AaronMDubya about Spring Framework for Google Cloud...

This Week in Spring - March 7th, 2023

Hi, Spring fans! Welcome to another installment of This Week in Spring! It's an amazing week, and this week we've got a lot to look at. Let's dive right into it. Spring Cloud Function for Azure Function Spring Data 2022.0.3 and 2021.2.9 released Spring R2DBC for Reactive Relational Databases in...

This Week in Spring - January 17th, 2023

Hi, Spring fans! Welcome to another installment of This Week in Spring! I went to Helsinki, Finland, last week, and this week I'm in Atlanta, Georgia, to speak at the Atlanta Java User Group. And, of course, next week, I'll be in New York to join a viewing party for the airing of SpringOne...

This Week in Spring - November 15th, 2022

Hi, Spring fans! Howre you doin this fine Tuesday morning? Ive returned home to San Francisco and am up and at em nice and early to catch a flight to Seattle, where Ill speak at the Java User Group tonight. If youre in Seattle, dont miss it! Weve got a ton of cool stuff to get into this week, but...

Spring Session 2022.0.0-M3 Released

On behalf of the team, I’m pleased to announce the release of Spring Session 2022.0.0-M3. These releases deliver, enhancements, bug fixes, and dependency upgrades. For your convenience, Spring Boot will pick up these artifacts with its upcoming releases. The following modules were updated as part...

A Bootiful Podcast: Dr. Kris De Volder on Spring Tools, VS Code, and so much more

Hi, Spring fans! In this episode Josh Long @starbuxman talks to Dr. Kris De Volder, a longtime member of the Spring Tools team, about all the cool stuff hes worked on and is going to work on. And then we get knee deep into a discussion around building IDE integrations...

A Bootiful Podcast: Flowable founder Joram Barrez on a Bootiful Podcast on workflow, business process management, and more

Hi, Spring fans! In this installment, Josh Long @starbuxman talks to Flowable founder Joram Barrez @jbarrez about workflow, business process management BPM, decision management, rules, and so much more...

A Bootiful Podcast: Spring Cloud and Spring Cloud Kubernetes contributor Ryan Baxter

Hi, Spring fans! In this episode, Josh Long @starbuxman talks to a person who knows more than most about the awesome implications of both the words "Spring" and "Cloud," Spring Cloud Kubernetes lead Ryan Baxter @ryanjbaxter...

A Bootiful Podcast: Kubernetes contributor and fellow Tanzu Developer Advocate Leigh Capili

Hi, Spring fans! In this installment Josh Long @starbuxman talks to fellow teammate and Kubernetes ecosystem legend Leigh Capili @capileigh about Gitops, Kubernetes, Puppet/Chef, continuous delivery, how zoom scales if you deploy on-prem, being a developer advocate, Flux, and so much more...

A Bootiful Podcast: JVM and .NET legend Ted Neward on... just about everything

Hi, Spring fans! In this installment, I @starbuxman talk to my old friend, world-famous polyglot and code curmudgeon, software philosopher, industry veteran, and legend of ecosystems aplenty, Ted Neward @tedneward...

Bootiful Podcast: Spring Framework contributor Sébastien Deleuze on GraalVM, AOT, project Leyden, and WebAssembly

Hi, Spring fans! In this installment, Josh Long @starbuxman talks to Spring Framework contributor Sébastien Deleuze @sdeleuze on GraalVM, AOT, project Leyden, and WebAssembly...

A Bootiful Podcast: Devoxx UK organizer and VoxxedDays cofounder Mark Hazell on running great conferences

Hi, Spring fans! In this installment, Josh Long @starbuxman talks to Devoxx UK organizer and Voxxed Days cofounder Mark Hazell @mrhazell...

A Bootiful Podcast: GraphQL Java founder Andi Marek

Hi, Spring fans! In this installment of a Bootiful Podcast, Josh Long @starbuxman talks to the GraphQL Java project founder and lead, Atlassian engineer, and Spring GraphQL cofounder Andi Marek @andimarek...

A Bootiful Podcast: Spring Security lead Rob Winch answers some security questions for me

Hi Spring and security fans! I got the legendary Spring Security lead Rob Winch to answers some of my burning security questions for us! Also: make sure you're downloading all the updates for the new Spring releases this week, the week of June 11th, 2026! or later...

CVE-2026-47838: Unauthorized User Impersonation when Using X.509 Client Certificates

This CVE is a continuation of CVE-2026-22747 , which addressed this same issue for Spring Security 7.0.x. SubjectDnX509PrincipalExtractor does not correctly handle certain malformed X.509 certificate CN values, which can lead to reading the wrong value for the username. In a carefully crafted...

This Week in Spring - June 10th, 2025

Hi, Spring fans! Welcome to another installment of This Week in Spring! It's been a busy week indeed since we last spoke! Last week I was in Amsterdam for the IntelliJ IDEA conference and for the JSpring event in Utrecht. Now, I'm in Tokyo, Japan, for the JJUG Spring 2025 event. Importantly: both...

This Week in Spring - April 8th, 2025

Hi, Spring fans! How are ya? I'm doing fine. Excited, even. You see, Spring AI M7 is coming soon! In theory, it drops on Thursday. Don't hold us to that — these things can change :- But soon , and it's turning out to be a whopper of a release! You should try upgrading your application to the new ...

Spring Security BCryptPasswordEncoder does not enforce maximum password length

BCryptPasswordEncoder.matchesCharSequence,String will incorrectly return true for passwords larger than 72 characters as long as the first 72 characters are the same...

Null Safety in Spring applications with JSpecify and NullAway

The initial introduction of the null safety support in Spring dates back to 2017 and the release of Spring Framework 5.0. In 2025, we are evolving that story to bring more added value for Spring developers, either in Java or Kotlin. But before having a deeper look to the changes we are working on...

This Week in Sprng - March 4th, 2025

Hi, Spring fans! Welcome to another installment of This Week in Spring , and Happy Devnexus 2025 to those who celebrate! That's right sports fans, I'm off to awesome Atlanta, Georgia later today for Devnexus, one of the world's largest annual gatherings of Java community and luminaries alike. I'l...

A Bootiful Podcast: Dez Blanchfield, a tech legend for all ages

Hi, Spring fans! Happy happy = new Year2025! It's a new year and a new opportunity! In this episode I talk to my friend and legendary technologist Dez Blanchfield!...

Bootiful Spring Boot 3.4: Start Here

Hi, Spring fans! And happy Spring Boot 3.4 release to those who celebrate! I know, I know what you're thinking: Josh, Spring Boot 3.4 already shipped! I know it. Spring Boot 3.4 dropped a week earlier this year! In the last couple of years, we’ve released Spring Boot on the same day as Thanksgivi...

Spring Tips: Testcontainers, Docker Compose, and Service Connections, oh my

Hi, Spring fans! In this installment, we look at the amazing service connection mechanism in Spring Boot. Service connections are what allow Spring Boot to connect to Testcontainers or Docker Compose containers for supporting infrastructure like SQL databases, middleare, and more. java...

Spring Tips: Go Further, Faster with Spring Boot 3.3 (UPDATED)

NB: I had an error in the AppCDS demo in the older video. This video supercedes that video, with a re-recorded segment on AppCDS. Make sure you're watching the latest of these two similarly titled videos! Hi, Spring fans! In this installment we look at ways to make your applications go further,...

This Week in Spring - June 11th, 2024

This Week in Spring - June 10th, 2024 Hi, Spring fans! Welcome to another installment of This Week in Spring! I'm in Paris, France, to talk to organizations using and working with Spring. Then, next week, it's off to Krakow, Poland, for the amazing Devoxx PL event! I can't wait. If you're around,...

A Bootiful Podcast: Daniel Garnier-Moiroux on Passkeys and Spring Security

Hi, Spring fans! In this installment, I talk to my friend and colleague Daniel Garnier-Moiroux about the amazing awesome implications of passkeys in a Spring Security application...

A Bootiful Podcast: Spring founders Rod Johnson and Juergen Hoeller on the 20th Anniversary of Spring Framework 1.0

Hi, Spring fans! In this episode, more than 20 incredible years in the making, Spring founders Rod Johnson @springrod and Juergen Hoeller @springjuergen discuss Spring since its 1.0 release in 2004...

Spring Tips: Spring AI

Hi, Spring fans! In this installment we'll look at the new Spring AI project, which provides convenient integrations with LLMs like the one behind ChatGPT and tools to support the RAG retrieval augmented generation pipeline. ai springboot artificialintelligence java graalvm cloud java21 postgresq...

CDS with Spring Framework 6.1

As a follow-up to the Runtime efficiency with Spring blog post, I am happy to share that our exploration of Project Leyden optimizations has led to some interesting discoveries regarding the JDK's little-used CDS "Class Data Sharing" feature and has materialized into a new feature that we have be...