Spring Tips: Learn Spring for GraphQL (parts 1 and 2 of an ongoing series)

Hi, Spring fans! In thi^^^ these installments, we begin a new series introducing the Spring for GraphQL project. In this first installment, GraphQL Java lead Andi Marek @andimarek and I @starbuxman look at the basics of using the GraphQL Java engine that underpins Spring for GraphQL. In this seco...

Spring Office Hours Podcast: S5E19 - Docker, Compose, Testcontainers, Oh My!

Join Dan Vega and DaShaun Carter for the latest updates from the Spring Ecosystem. In this episode, Dan and DaShaun will discuss some of the new features around Docker, Testcontainers and the Spring Boot plugin. You can participate in our live stream to ask questions or catch the replay on your...

Self-Correcting Structured Output in Spring AI 2.0

Large language models are text-in, text-out systems — their interface is natural language. Natural language is a great interface for humans and a poor one for software. The moment downstream code needs to route on a field, persist a value, or branch on a result, the conversation has to become a...

Predictable temp directory accepted without ownership verification

A local attacker on the same host as the application may be able to take control of the directory used by ApplicationTemp . When server.servlet.session.persistent is set to true and the attack persists across application restarts, this may allow the attacker to read session information and hijack...

Moving beyond Strings in Spring Data

If you've worked with data access in Java and especially with Spring Data for a while, then you are familiar with various Query and Update programming models. You write data access code. You refactor a property name. You run your tests. They fail. Your query strings? Still pointing to the old...

Anthropic Agent Skills Support in Spring AI

In this blog, we show how using Spring AI, we can integrate with Anthropic's Native Skills API for Cloud-Based Document Generation and Custom Skills. Spring AI adds support for Anthropic's Agent Skills — modular capabilities that let Claude generate actual files rather than text descriptions. Wit...

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...

RFD Attack via “Content-Disposition” Header Sourced from Request

In Spring Framework, versions 6.0.x as of 6.0.5, versions 6.1.x and 6.2.x, an application is vulnerable to a reflected file download RFD attack when it sets a “Content-Disposition” header with a non-ASCII charset, where the filename attribute is derived from user-supplied input. Specifically, an...

This Week in Spring - May 13th, 2025

Hi, Spring fans! As I write this, I'm at the amazing Code Remix event in Miami well, technically Tampa, Florida. I'll also be speaking at the Tampa JUG while I'm there, so look out! After that, I'll be headed back to Europe—a wee bit further north this time—to Stockholm for the amazing JForum...

Dynamic Tool Updates in Spring AI's Model Context Protocol

The Model Context Protocol MCP is a powerful feature in Spring AI that enables AI models to access external tools and resources through a standardized interface. One interesting capabilities of MCP is its ability to dynamically update available tools at runtime. This blog post explores how Spring...

Bootiful Spring Boot 3.4: Spring Boot

And now we’re back where we started: Spring Boot 3.4! This release is what pulls everything together. When you look at Spring Boot, remember that it normalizes the integration of all the projects it assembles and tries, wherever possible, to smooth out whatever integration issues might arise from...

Spring Security Authorization Bypass for Case Sensitive Comparisons

The usage of String.toLowerCase and String.toUpperCase has some Locale dependent exceptions that could potentially result in authorization rules not working properly. Related to CVE-2024-38820...

This Week in Spring - August 15th, 2023

SpringOne, the first in-person SpringOne since the pandemic! - is next week!! I'm so excited I could spit. And I did spit. And then, I asked ChatGPT for some help writing a poem, and it did not disappoint! T'was a week before SpringOne, in Las Vegas so grand, Where devs from all corners would soo...

Spring Modulith 0.3 released

Hot on the heels of Spring Boot 3.0.2, I am excited to announce the 0.3 release of Spring Modulith. The release is packed with improvements. We have tweaked a couple of things that might require your attention and a couple of adapting changes to your code. The most notable changes are: GH-114 – W...

Tool Calling in Spring AI 2.0: A Composable, Agentic Architecture

Tool calling — the ability for an AI model to invoke application-defined functions and act on the results — is the essential building block of agentic AI systems. A model that can discover information, take action, and loop until a goal is reached is an agent. Spring AI 2.0 rearchitects tool...

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...

Cassandra SSL auto-configuration disables TLS hostname verification

Spring Boot's Cassandra auto-configuration does not perform hostname verification when establishing an SSL connection to Cassandra...

This Week in Spring – December 23rd, 2025

Happy holidays, everyone! The year may be winding down, but the Spring ecosystem continues unabated. We’re now a few weeks past the generational Spring Boot 4.0 release in November, and there have been tons of releases and patches since then. There’s also equal excitement reflected in posts from...

A Bootiful Podcast: Spring Security lead Rob Winch on the amazing Spring Security 6.4 release

Hi, Spring fans! In this installment, we'll talk to the amazing Rob Winch, lead of Spring Security 6.4, about the jam-packed new release! spring springboot security java...

This Week in Spring - October 15th, 2024

Hi, Spring fans! Welcome to another rip-roaring and ever-so-riveting installment of This Week in Spring! I'm in Amsterdam, at the moment, rounding out a week between Antwerp, Beglium, and Amsterdam, the Netherlands. Today I'm off to Dubai for the fantastic GITEX/DevSlam event. Then I return back ...

Spring Tips: Spring Cloud Gateway for Spring MVC

Hi, Spring fans! In this installment, we revisit Spring Cloud Gateway, this time to look at the fantastic new support for Spring MVC, made all the more amazing by Java 21's virtual threads...

DevTools remote secret comparison is vulnerable to timing attacks

An attacker on the same network as the remote application may be able to utilize a timing attack to discover information about the remote secret. In extreme circumstances this could result in the attacker determining the secret and uploading changed classes, thereby achieving remote code executio...

PID file write follows symlinks at predictable default path

When an application is configured to use ApplicationPidFileWriter , a local attacker with write access to the PID file's location can corrupt one file on the host each time the application is started...

Spring Security Authorization Server Dynamic Client Registration endpoints perform insufficient validation of client metadata

Spring Security Authorization Server Dynamic Client Registration endpoints perform insufficient validation of certain client metadata fields when explicitly enabled. An attacker possessing a valid Initial Access Token can dynamically register a malicious client with crafted metadata. Depending on...

A Bootiful Podcast: Neo4j legend Jennifer Reif

Hi, Spring fans! In this installment, I talk to Jennifer Reif, developer advocate at Neo4J, about graph RAG, graph databases, GraphQL, Neo4J, Spring Data Neo4J, and more. neo4j graphRag AI artificialintelligence...

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 - August 12th, 2025

Hi, Spring fans! Welcome to another installment of This Week in Spring! It's August 5th! Which means we're only a few short weeks away until SpringOne 2025! Have you registered? There's so much to cover this week, so let's dive right into it! I love Spring Modulith and I love JetBrains IntelliJ...

This Week in Spring - July 22nd, 2025

Hi, Spring fans! It's almost SpringOne time!! AAAAH it's all moving so quickly! I can hardly stand it. SpringOne's next month, in lovely Las Vegas, and I'll be there. Will you? Have you registered? We'll be looking at the impending Spring Boot 4.0 and Spring Framework 7.0 releases! It's going to ...

This Week in Spring - May 27th, 2024

Hi, Spring fans! Welcome to another installment of This Week in Spring! And what a week it will be! I'm in Venice, Italy, on a little vacation, but tomorrow I begin a quick journey to beautiful Sofia, Bulgaria, where I'll be speaking at the amazing JPrime software show it's my first time speaking...

SBOM support in Spring Boot 3.3

Spring Boot 3.3.0 has been released, and it contains support for SBOMs. SBOM stands for "Software Bill of Materials" and describes the components used to build a software artifact. In the context of this blog post, that's your Spring Boot application. These SBOMs are useful because they describe...

Context Propagation with Project Reactor 3 - Unified Bridging between Reactive and Imperative

This post is a part of a series: 1. The Basics 2. The bumpy road of Spring Cloud Sleuth 3. Unified Bridging between Reactive and Imperative We concluded the last article with the thought that Spring Cloud Sleuth’s MANUAL context propagation strategy is both performant and provides correct...

Introducing Spring Modulith

When designing software systems, architects and developers have plenty of architectural options to choose from. Microservice-based systems have become ubiquitous in the last couple of years. However, the idea of monolithic, modular systems has also regained popularity recently. Independent of the...

This Week in Spring - March 29th, 2022

Aloha, Spring fans, from beautiful Maui, Hawaii, where I am with my family on a bit of vacation. Its our daughters Spring break and so were enjoying the family time while we can get it! I wanted to take a brief interlude in between the never-enough time on the beach and all the rum to get this...

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...

A Bootiful Podcast: Dan Vega on the fundamentals of software engineering

Hi, Spring fans! I'm so excited to chat with fellow Spring developer advocate Dan Vega about his new book, Fundamentals of Software Engineering...

Spring Data Ahead of Time Repositories - Part 2

Concluding the Road to GA blog post series, let's explore benefits of Spring Data AOT Repositories. Back in May 2025, we first introduced Ahead of Time AOT repositories as a preview feature for JPA and MongoDB with the 3rd Milestone of the next Spring Data generation. This feature, in short, uses...

Spring AI - Multimodality - Orbis Sensualium Pictus

Humans process knowledge, simultaneously across multiple modes of data inputs. The way we learn, our experiences are all multimodal. We don't have just vision, just audio and just text. These foundational principles of learning were articulated by the father of modern education John Amos Comenius...

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...

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 - June 27th, 2023

Hi Spring fans! Welcome to another installment of This Week in Spring! This week I am in Seoul talking to developers about the latest-and-greatest in Spring Boot 3! There's so much great stuff coming, and so much great stuff already. There are a few things I'm super excited about. First, yesterda...

This Week in Spring - April 18th, 2023

Hi, Spring fans! Welcome to another installment of This Week in Spring! This week, I just returned from Western Europe for Devoxx FR Paris and Kotlin Conf Amsterdam. I went home, saw my family, did some laundry, and then turned right back around to head to Chicago, Illinois, for a special joint...

A Bootiful Podcast: Mark Thomas, Apache Tomcat contributor extraordinaire

Hi, Spring fans! Welcome to another installment of A Bootiful Podcast! In this installment, Josh Long talks to longtime Apache Tomcat contributor extraordinaire Mark Thomas I wrote a free white paper on using Spring Boot 3 AOT and GraalVM. Learn the secrets to working with Spring Boot 3 and Graal...

This Week in Spring - Happy New Year 2023 edition - December 27th, 2022

Hi, Spring fans! Welcome to another installment of This Week in Spring! Its 27 December as I write this and - being honest - I couldnt be happier. Its raining outside. Im in a warm cozy office. Good music is playing. People are asleep in my home. I can hear the raindrops and wind outside the...

This Week in Spring - April 26th, 2022

Hi, Spring fans! Welcome to another installment of This Week in Spring! This week I was hoping to be in glorious Chicago, Illinois for the first in-person SpringOne Tour installment since the pandemic. But, alas, I couldnt go because - out of an abundance of caution, and since I was exposed to...

cve-2026-41862 - HIGH - Kryo deserialization of persisted context without class allowlist

cve-2026-41862 - HIGH - Kryo deserialization of persisted context without class allowlist...

Spring Framework Denial of Service via Integer Overflow in SpEL Expressions

An integer overflow vulnerability exists in the evaluation logic of the Spring Expression Language SpEL. An attacker can exploit this by supplying a specially crafted SpEL expression that triggers excessive resource consumption, resulting in a Denial of Service DoS. Specifically, an application i...

This Week in Spring - Spring Boot 4 edition! - November 25th, 2025

Hi, Spring fans! Welcome to another illustrious installment of This Week in Spring! It’s Thanksgiving week here in the United States. Thanksgiving is traditionally celebrated with friends and family every fourth Thursday of November, gathered around a table full of food and, usually, a giant...

Spring gRPC Next Steps for 1.0.0

This is a new blog post in the Road to GA series, this time updating everyone on the plans to integrate Spring gRPC with Spring Boot 4. The original plan was to move the autoconfiguration from Spring gRPC into Spring Boot in time for the 4.0 release. Unfortunately we haven't been able to find the...

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 - May 6th, 2025

Hi, Spring fans! As I write this, I'm winging my way to lovely London, UK, for the amazing Devoxx UK event! I'll be looking at the wide and wonderful world of Springdom. Then, from there, it's off to Code Remix in Miami. I'll also be speaking at the Tampa JUG while I'm there, so look out! After...