This Week in Spring - May 30th, 2023

Hi, Spring fans! Welcome to another installment of This Week in Spring! This installment I write on the day of my daughter's High School graduation, an auspicious day indeed! There's a lot to get through this week, though, and I have a graduation to get to, so let's dive right in! Spring...

Introducing Microservices Patterns with Spring Integration

Hey Spring Community! I hope you are enjoying Spring One Essentials these days. The most exciting feature for me is an Observability which is spread throughout the Spring portfolio from now on. Nevertheless, today Id like to share with a project Im working on since holidays, where the mentioned...

This Week in Spring - June 14th, 2022

Hi, Spring fans! Welcome to another installment of This Week in Spring! Ive just arrived in beautiful Berlin, Germany, for the forthcoming We Are Developers show with more than five thousand attendees. I was in Toronto, Canada, for the epic SpringOne Tour installment there. Ive also had the...

CVE-2026-41840: Spring Framework Denial of Service via Multipart Requests in WebFlux

Spring WebFlux applications are vulnerable to Denial of Service DoS attacks when processing multipart requests. More precisely, an application can be vulnerable when all the following are true: When all the conditions above are met, an attacker can send malicious multipart requests that can leak...

This Week in Spring - March 3rd, 2026

Hi Spring fans! Welcome to another rip-roaring installment of This Week in Spring! I'm writing this in an Uber en route to the airport to get to awsome Atlanta, GA, for Devnexus 2026! Who's goin'? You goin'? We - the Spring team - will be there in force! Come say hi at the boothes or come see our...

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 ...

This Week in Spring - April 2nd, 2024

Welcome, welcome, welcome, to another installment of This Week in Spring! You know, we've come a long way since you and I last spoke. It's April already! A new month! How bizarre. And, with the dawning of a new month, we're also more than 25% through this year! I sure hope you're paying attention...

This Week in Spring - August 23rd, 2022

Hi, Spring fans! Welcome to another installment of This Week in Spring! Weve got a ton to cover, so lets dive right into it! A Bootiful Podcast: Flowable founder Joram Barrez on a Bootiful Podcast on workflow, business process management, and more Building IoT Applications Using Fauna and Spring...

CVE-2026-41843

CVE-2026-41843...

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 - June 4th, 2024

Hi, Spring fans, from London! I'm in this fabulous country doing my level-headed best to refrain from dooing Mr. Bean bits, because, honestly, if I - an avid and prolific fan of Spring and its many beans - can't be "Mr. Bean," then I'm glad Rowan Atkinson is! I'm here for a SpringOne Tour event,...

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...

Web applications and Project Loom

Introduction Project Loom aims to bring "easy-to-use, high-throughput, lightweight concurrency" to the JRE. One feature introduced by Project Loom is virtual threads. In this blog post, we'll be exploring what virtual threads mean for web applications using some simple web applications deployed o...

This Week in Spring - October 18th, 2022

Hi, Spring fans! Howre you doin? Im doin alright! Last week I was in Antwerp, Belgium, for the amazing Devoxx BE show. I did a presentation with my friend and hero James Ward on Spring and Kotlin that was voted third most-liked talk at a show with more than 250 speakers! That was a personal caree...

My SpringOne 2023 Recap

Hi, Spring fans! Look, it's Monday after the first in-person SpringOne of the 2020s and the first since the pandemic, and, being honest, I'm bushed! Vegas is a dizzying, sensational, overwhelming, exciting experience, and SpringOne is too. But it was worth it. The SpringOne show surpassed all...

The 2022 State of Spring Survey Report

Hi, Spring fans! You're awesome! I know you're awesome. You know you're awesome. And the Spring team works for you. We like working for you because you dream awesome dreams and build awesome things. And we can't work effectively with and for you if we don't know where everyone stands. Every year ...

Spring Security 5.8.0-M1 and 6.0.0-M6 are released

On behalf of the team and everyone who has contributed, I am pleased to announce that Spring Security 5.8.0-M1 and 6.0.0-M6 are available now. This release includes dependency upgrades, bug fixes, and enhancements. Here are a few noteworthy changes: Deferred SecurityContext lookup...

Transactional Rollback Strategies with Spring Cloud Stream and Apache Kafka

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 In th...

Spring Tools 4.15.1 released

Dear Spring Community, I am happy to announce the 4.15.1 release of the Spring Tools 4 for Eclipse, Visual Studio Code, and Theia. fixes and improvements Spring Boot fixed: VScode incorrectly suggests removing @Autowired annotation from methods 787 Spring Boot fixed: VScode quick fix should not...

cve-2026-47838 - MEDIUM - Unauthorized User Impersonation when Using X.509 Client Certificates

cve-2026-47838 - MEDIUM - Unauthorized User Impersonation when Using X.509 Client Certificates...

This Week in Spring - March 12th, 2024

Hi, Spring fans! Welcome to another installment of This Week in Spring! And what a week it's going to be! Do this first: we need your help! Please answer some questions in our State of Spring survey! Join me for a look at the latest-and-greatest, chronicling how I got started with Spring Boot in...

This Week in Spring - February 20th, 2024

Hi, Spring fans! Welcome to another installment of This Week in Spring! How are you this fine 20th of February, 2024? I'm doing alright on this rainy 20th of Feburary here in San Francisco, and I hope you are too! We've got a ton of things to get into this week so let's dive right into it! Have y...

This Week in Spring - February 14th, 2024

Hi, Spring fans! Welcome to another installment of This Week in Spring! Friends, tomorrow is Valentine's day, and I love Spring. So, it's a very exciting thing indeed to be able to share this week's jam-packed roundup. Let's dive right into it! Spring Tools 4.21.1 is now available In the latest...

This Year in Spring - 2023

Welcome to another installment of This Week in Spring! It's December 26th, 2023, and we're staring down the new year! And you know what that means, right? It's time for our annual roundup, looking at all the latest and greatest in the wild and wonderful world of Springdom. This is This Year in...

All together now: Spring Boot 3.2, GraalVM native images, Java 21, and virtual threads with Project Loom,

This has been a very long time in coming, but finally we can create GraalVM native images that use Spring Boot via Spring Boot 3.2 and Java 21's virtual threads Project Loom! Why does all this matter? Each of these individual things, Project Loom, and GraalVM native images, offer compelling runti...

This Week in Spring - November 29th, 2022 (Spring Boot 3 has arrived)

Hi, Spring fans! Its here! Its finally here, at long last! Spring Boot 3!! And of course with Spring Boot 3.0 comes a whole portfolio of integrated projects that have also been updated! Remember, a huge theme in this release is support for GraalVM native images, and thats now supported across the...

Microsoft is committed to the success of Java developers

Hi, Spring fans! This is a guest post from our friend Julia Liuson, President, Developer Division, Microsoft As a company, we are committed to making Java developers as efficient and productive as possible. This commitment means empowering you to use any tool, framework, and application server on...

Spring Framework DoS with Multipart Temp Files in WebFlux

A WebFlux server application that processes multipart requests creates temp files for parts larger than 10 K. Under some circumstances, temp files may remain not deleted after the request is fully processed. This allows an attacker to consume available disk space...

This Week in Spring - February 3rd, 2026

Hi, Spring fans! This week I'm in northern Europe. I went on the Vaadin cruise from Finland to Sweden, gave a talk on a boat, then arrived in Stockholm in time for the amazing JFokus 2026 event where I had the privilege yesterday of doing a deep dive with my pal James Ward on Spring AI and agenti...

Introducing Microservices Patterns with Spring Integration

Hey Spring Community! I hope you are enjoying Spring One Essentials these days. The most exciting feature for me is an Observability which is spread throughout the Spring portfolio from now on. Nevertheless, today I’d like to share with a project I’m working on since holidays, where the mentioned...

CVE-2026-41848

CVE-2026-41848...

MongoDB-backed Spring Batch jobs and more in Spring Boot 4.1

Spring Batch was introduced many years before MongoDB existed, and its design assumed the presence of a SQL database in which to store the state of Spring Batch jobs. But that was decades ago, and a common question for anyone new to Spring Batch was, "Why does this thing need to talk to a SQL...

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...

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...

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...

This Week in Spring - March 19th, 2024

Hi, Spring fans! And happy Java 22 release day to those who celebrate! I just put out a huge blog detailing many of the exciting new features in Java 22. Check it out! As usual, we've got a packed roundup to get through this week so let's dive right into it! the Spring Authorization Server 1.3.0-...

Embracing Virtual Threads

Project Loom has made it into the JDK through JEP 425. Its available since Java 19 in September 2022 as a preview feature. Its goal is to dramatically reduce the effort of writing, maintaining, and observing high-throughput concurrent applications. Where Virtual Threads make sense This makes...

CVE-2026-41844

CVE-2026-41844...

Denial of service in static resource handling on Windows platforms

Spring MVC and WebFlux applications are vulnerable to Denial of Service attacks when resolving static resources. More precisely, an application can be vulnerable when all the following are true: When all the conditions above are met, the attacker can send malicious requests that are slow to resol...

This Week in Spring - April 9th, 2024

Hi, Spring fans! Welcome to another installment of This Week in Spring! I'm in Las Vegas, NV, at the moment, preparing for my part in the huuuuuge Google Cloud Next keynote. I'm so excited! And then it's off to the amazing and glorious Devnexus event! If you're at either event, please say Hi!. Fu...

Function Calling in Java and Spring AI using the latest Mistral AI API

UPDATE: As of March 13, 2024, Mistral AI has integrated support for parallel function calling into their large model, a feature that was absent at the time of this blog's initial publication. Mistral AI, a leading developer of open-source large language models, unveiled the addition of Function...

Spring Tips: Spring Boot Testjars

Hi, Spring fans! In this installment we look at the brand new Spring Boot Testjars project, which greatly simplifies standing up and reusing satellite Java-based services like other Spring Boot-based microservices or infrastructure like the Spring Authorization Server. springboot java java21...

This Week in Spring - July 25th, 2023

Hi, Spring fans! Welcome to another installment of This Week in Spring! Look, I'm going to level with you. This is the view from where I'm staying on holiday right now in tropical Lankawi, Malaysia: I'm super interested in this week's roundup, as always, but I'm also very interested in that...

Improved Testcontainers Support in Spring Boot 3.1

There's been support for Testcontainers in Spring Boot for some time now, and Spring Boot 3.1 improves it further. But first, let's take a look at what Testcontainers is and how it's usually used. Testcontainers is an open source framework for providing throwaway, lightweight instances of...

CVE-2026-41847

CVE-2026-41847...

CVE-2026-41845

CVE-2026-41845...

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...

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...

Structured logging in Spring Boot 3.4

Logging is a long established part of troubleshooting applications and one of the three pillars of observability, next to metrics and traces. No one likes flying blind in production, and when incidents happen, developers are happy to have log files. Logs are often written out in a human-readable...

Runtime efficiency with Spring (today and tomorrow)

With Spring Framework 6.1 and Spring Boot 3.2 general availability approaching, we would like to share an overview about several efforts the Spring team is pursuing to allow developers to optimize the runtime efficiency of their applications. We are going to cover the following technologies and u...