Reflectionless Templates With Spring

A few Java libraries have shown up recently that use text templates, but compile to Java classes at build time. They can thus claim to some extent to be "reflection free". Together with potential benefits of runtime performance, they promise to be easy to use and integrate with GraalVM native ima...

A Bootiful Podcast: Stuart Marks (aka ”Dr. Deprecator”) on Java, its amazing features, and more

Hi, Spring fans! Happy one-day-belated Java 22 release day to those who celebrate! To ring in the new release, we've got an extra special and incredible discussion with a Java legend - somebody who's been involved in the Java community and work for decades - Stuart Marks, or "Dr. Deprecator," as...

Spring Tips: the Exposed ORM for Kotlin

Hi, Spring fans! In this installment we look at the Exposed Object Relational Mapper framework for Kotlin. Kotlin Java JDBC springboot...

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-...

Hello, Java 22!

update I've since published a Spring Tips video on this very topic! If you'd prefer, you could watch that instead. Hi, Spring fans! Happy Java 22 release day, to those who celebrate! Did you get the bits already? Go, go, go! Java 22 is a significant improvement that I think is a worthy upgrade fo...

PKCE Downgrade in Spring Authorization Server

Spring Authorization Server versions 1.0.0 - 1.0.5, 1.1.0 - 1.1.5, 1.2.0 - 1.2.2 and older unsupported versions are susceptible to a PKCE Downgrade Attack for Confidential Clients. Specifically, an application is vulnerable when a Confidential Client uses PKCE for the Authorization Code Grant. An...

Token Exchange support in Spring Security 6.3.0-M3

I'm excited to share that the there will be support for the OAuth 2.0 Token Exchange Grant RFC 8693 in Spring Security 6.3, which is available for preview now in the latest milestone 6.3.0-M3. This support provides the ability to use Token Exchange with OAuth2 Client. Similarly, server-side suppo...

Possible Broken Access Control in Spring Security With Direct Use of AuthenticatedVoter

In Spring Security, versions 5.7.x prior to 5.7.12, 5.8.x prior to 5.8.11, versions 6.0.x prior to 6.0.9, versions 6.1.x prior to 6.1.8, versions 6.2.x prior to 6.2.3, an application is possible vulnerable to broken access control when it directly uses the AuthenticatedVotervote passing a null...

Spring Boot Testjars founder Rob Winch

Hi, Spring fans! In this week's installment we talk Rob Winch, lead of Spring Security and founder of the exciting new project Spring Boot Testjars...

Hypermedia and Browser Enhancement

Front end development these days is dominated by large JavaScript client side frameworks. There are plenty of good reasons for that, but it can be very inefficient for many use cases, and the framework engineering has become extremely complex. In this article, I want to explore a different...

Spring Framework URL Parsing with Host Validation (2nd report)

Applications that use UriComponentsBuilder to parse an externally provided URL e.g. through a query parameter AND perform validation checks on the host of the parsed URL may be vulnerable to a open redirect attack or to a SSRF attack if the URL is used after passing validation checks. This is the...

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...

Spring Tips: Spring Batch Remote Partitioning, your easy button for data scale!

Hi, Spring fans! In this installment, Spring Developer Advocate Josh Long looks at how to use Spring Batch's remote partitioning support to easy-button your data processing scale out strategies. postgresql ai datascience data springboot java java21...

Bootiful Spring Boot in 2024 (part 1)

NB: the code is here on my Github account: github.com/joshlong/bootiful-spring-boot-2024-blog. Hi, Spring fans! I'm Josh Long, and I work on the Spring team. I'm excited to be keynoting and giving a talk at Microsoft's JDConf this year. I'm a Kotlin GDE and a Java Champion, and I'm of the opinion...

A Bootiful Podcast: Cristian Schuszter on CERN

Hi, Spring fans! In this installment I talk to Cristian Schuszter, a software engineer at CERN. This episode was recorded live at VOXXED DAYS CERN!. Don't forget to help us out with the State of Spring Survey...

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: the Spring Authorization Server: durability of data

Hi, Spring fans! In this installment, we continue our look at the venerable Spring Authorization Server, this time looking at how to configure persistence and durability for various aspects of the system...

This Week in Spring - March 5th, 2024

Hi, Spring fans! Welcome to another exciting roundup of This Week in Spring! I expect many of you are reading this for the first time, especially with Facebook and Instagram being down. People have been exploring all the other lesser-known corners of the web, looking for their daily "doom scroll....

A Bootiful Podcast: Roni Dover on Digma AI

Hi, Spring fans! In this installment we talk to Digma AI founder Roni Dover...

Spring Tips: the Spring Authorization Server: securing SPAs and messaging flows

hi, Spring fans! In this installment, we continue our look at the venerable Spring Authorization Server, this time looking at how to extend its use beyond just HTTP APIs, to secure single page applications and messaging flows with OAuth...

This Week in Spring - February 27th, 2024

Hi, Spring fans! Welcome to another installment of This Week in Spring wherein we explore the latest-and-greatest in the wonderful world of Springdom. This week's going to be a very good one, so let's dive right into it! good news everyone! Spring Boot's been updated! 3.3.0-M2, 3.2.3, and 3.1.9 a...

A Bootiful Podcast: Timefold Solver AI lead Geoffrey De Smet

Hi, Spring fans! In this installment, I talk to Timefold Solver AI lead Geoffrey De Smet about the amazing new integrations for Spring Boot developers...

Spring Framework URL Parsing with Host Validation

Applications that use UriComponentsBuilder to parse an externally provided URL e.g. through a query parameter AND perform validation checks on the host of the parsed URL may be vulnerable to a open redirect attack or to a SSRF attack if the URL is used after passing validation checks...

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...

Broken Access Control in Spring Security With Direct Use of isFullyAuthenticated

In Spring Security, versions 6.1.x prior to 6.1.7 and versions 6.2.x prior to 6.2.2, an application is vulnerable to broken access control when it directly uses the AuthenticationTrustResolver.isFullyAuthenticatedAuthentication method. Specifically, an application is vulnerable if: An application...

A Bootiful Podcast: Oracle Java Developer Advocate Nicolai Parlog on the latest and greatest in Java

Hi, Spring fans! In this installment, I talk to Oracle Java Developer Advocate Nicolai Parlog on the latest and greatest in Java...

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...

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...

A Bootiful Podcast: Dr. Venkat Subramaniam, on the latest in Java

Hi, Spring fans! In this installment the good and the great Dr. Venkat Subramaniam rejoins the show, live from the fantastic VOXXED DAYS CERN event, to talk about some of the amazing features in Java 21...

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...

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: Gunnar Morling on the 1BRC challenge and taking Java to BLAZING fast performance territory

Hi, Spring fans! In this installment, I talk to fellow Java Champion Gunnar Morling, and we look at how his 1BRC challenge helped the community eek out some of Java's best performance numbers...

This Week in Spring - January 30th, 2024

Hi, Spring fans! It's January 30th, and it's a very special week for me as, tomorrow, I celebrate my birthday and the birthday of my biological father with whom I share the same birthday! Happy birthday, dad! Sadly, he passed in 2019. I'm pretty excited! I'm turning 40. Feels good. Almost as good...

Spring Tips: easy CQRS with Axon Framework

Hi, Spring fans! In this installment I'm joined by Axon Framework founder Allard Buijze and we look at the new integrations for Spring Boot developers in Axon Framework and AxonIQ Server. Special thanks to AxonIQ for the keynote video replay. Check out for more great stuff! java java21 axon...

local information disclosure via temporary directory created with unsafe permissions

In Spring Cloud Contract, versions 4.1.x prior to 4.1.1, versions 4.0.x prior to 4.0.5, and versions 3.1.x prior to 3.1.10, test execution is vulnerable to local information disclosure via temporary directory created with unsafe permissions through the shaded com.google.guava:guava dependency in...

A Bootiful Podcast: Spring trainer extraordinairre Patrick Baumgartner

Hi, Spring fans! In this installment, I talked to Spring trainer extraordinaire, long-time community contributor, and Voxxed Days co-organizer for various shows in Switzerland. This talk was recorded live at Voxxed Days CERN!...

This Week in Spring - January 23rd, 2024

Hi, Spring fans, and greetings from CERN, home of the famous Large Hadron Collider, where I'm speaking again at the VOXXED Days CERN 2017 event. It's been an amazing almost week here in lovely Switzerland, first in Lugano for VOXXED Days Ticino, and now in Geneva. I'm super excited to be here, bu...

Spring Framework server Web DoS Vulnerability

In Spring Framework versions 6.0.15 and 6.1.2, it is possible for a user to provide specially crafted HTTP requests that may cause a denial-of-service DoS condition. Specifically, an application is vulnerable when all of the following are true: Typically, Spring Boot applications need the...

CVE-2024-22233: Spring Framework server Web DoS Vulnerability

The Spring Framework 6.0.16 and 6.1.3 releases shipped on January 11th includes a fix for CVE-2024-22233. The Spring Boot 3.1.8 and 3.2.2 releases shipped last week upgrade to the relevant Spring Framework versions. Users are encouraged to update as soon as possible...

Spring Security 6.3 Adds Passive JDK Serialization/Deserialization for Seamless Upgrades

In the early versions of Spring Security, a deliberate decision was made to avoid providing any guarantee of compatibility for serialized classes via JDK serialization between different versions of the project. This decision primarily took into account the context of RMI, with the recommendation...

A Bootiful Podcast: programming language archaeologist Ted Neward

Hi, Spring fans! In this installment, I talk to programming language archaeologist Ted Neward...

This Week in Spring - January 16th, 2024

Hi, Spring fans! Welcome to another installment of This Week in Spring! It's the 16th of January already! We're closer to February than not! I can hardly believe it. As always, we've got a lot to cover so let's dive right into it. the Spring Authorization Server 1.3.0-m1 is now available this is...

A Bootiful Podcast: Apache Skywalking’s Sheng Wu and Apache ShardingSphere’s Trista Pan

Hi, Spring fans! In this installment we're joined by two Apache luminaries Trista Pan - of Apache ShardingSphere - and Sheng Wu - of Apache Skywalking...

Spring Tips: Spring Data JDBC

Hi, Spring fans! In this installment, Josh Long looks at the fantastic Spring Data JDBC project, which is one of the easiest and most powerful ways to leverage JDBC in a Spring Boot application...

This Week in Spring - January 9th, 2024

Hi, Spring fans! Welcome to another installment of This Week in Spring! It's the second week of 2024, and I am already thinking about 2025! And, a bit more immediatelt than that: the next two weeks. I'll be at both VOXXED DAYS Ticino and VOXXED DAYS CERN, both in Switzerland. If you're about, com...

A Bootiful Podcast: Kubernetes guru Leigh Capili helps us ring in the new year

Hi, Spring fans! And Happy new year! In this episode I talk to Kubernetes guru Leigh Capili, who helps us ring in the new year!...

This Week in Spring - January 2nd, 2024

Hi, Spring fans! Happy New Year! As we step into 2024, full of hope and enthusiasm, welcome to the first installment of This Week in Spring. It's a time for new beginnings and resolutions, and what better way to start than by exploring the ever-evolving world of Spring? I hope your new year...

A Bootiful Podcast: Trifork CTO Joris Kuipers

Hi, Spring fans! In this installment, Josh Long talks to longtime Spring community legend and Trifork CTO Joris Kuipers. Happy new year!...

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...

A Bootiful Podcast: Cloud Native Whitney Lee

Hi, Spring fans! In this installment, I talk to legendary Cloud Native Whitney Lee about cloud infrastructure, that one trick every dev must know, her new operations-centric gameshow, and more. Happy holidays to y'all!...