We concluded the last article with the thought that Spring Cloud Sleuth’s MANUAL context propagation strategy is both performant and provides correct semantics. Out of many experiences, the Spring, Micrometer, and Reactor teams created a new context-propagation library. Its goal is to encapsulate the concern of transporting contextual data between ThreadLocal values and Map-like structures. Both Micrometer 1.10 and Reactor 3.5 build on top of it to provide a first-class experience between Reactor and imperative code. By using Reactor Context, we implicitly expose ThreadLocal values that are…

Spring Cloud Sleuth recently became Micrometer Tracing, part of the Micrometer project. Most of the tracing instrumentation is centered within Micrometer under the new Observability API. The goal of these projects is to enable observability of any application – in the form of metrics, tracing, and logs that contain correlation identifiers. To achieve this goal, libraries require a way to transport contextual information. When applications deal with asynchrony in any form, that task becomes quite a challenge. In the previous article, we went through the basics of context propagation with …

Hi, Spring fans! Welcome to another installment of This Week in Spring! I'm reporting to you from Los Angeles, where my family and I have gone for my daughter's spring break. We're going to survey some prospective colleges and we're going to Disneyland. Needless to say, I'm doubly glad to have all this cool stuff to read this week; I can really savor each article! Let's dive in!

• Context Propagation with Project Reactor 1 - The Basics
• Introduction to Grafana Loki
• JDK 20 Release Notes
• Not Spring Boot, per se, but this is interesting if you're developing against Kubernetes and want a quick introduction: Lightweight Kubernetes Distributions
• Run a Spring Boot Application in AWS Lambda
• SAML with Spring Boot and Spring Security
• Spring Boot 2.7.10 available now
• Spring Integration for AWS 3.0.0-M2 and Spring Cloud Stream Kinesis Binder 4.0.0-M1 Available
• Spring Kafka: Configure Multiple Listeners on Same Topic
• Spring Modulith 0.5.1 released
• …

Spring Boot 3 and Spring Framework 6 brought us a unified and consistent way to enable Observability in applications that use Micrometer. The evolution from Spring Cloud Sleuth to Micrometer, along with the Observation API and Micrometer Tracing, made us consolidate various approaches to context propagation. In this blog post series, we aim to explain how we came to support context propagation in Project Reactor to meet the needs of imperative libraries. By building your understanding from the ground up, you will be able to use these constructs and understand what’s happening underneath. We…

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 GraalVM native images https://tanzu.vmware.com/content/white-papers/spring-boot-3
• I did a Spring Tips installment on using Vaadin and Spring Boot 3 together, along with the shiny new AOT support https://www.youtube.com/watch?v=nyR-qzj7O3w
• Java 20 is out! the last one to install it is a rotten egg! Get the bits NOW! https://twitter.com/java/status/1638195008162471936
• Want to learn Spring Boot 3? Check out this video I did for the Jetbrains channel a few weeks ago …

We are launching a new way to pay for Azure Spring Apps -- the consumption pricing plan. This plan is now in public preview so you can start creating and deploying apps today. This new plan is super-efficient because you can start from zero and scale to zero vCPU. You get more straightforward pricing across your containerized applications since it costs the same as Azure Container Apps, but with added value for Spring apps.

How does this work? With the new plan, you can deploy apps that don’t need to run all the time or apps that have bursts of traffic and only pay for the resources used…

Hi, Spring fans! Welcome to another rip roaring installment of This Week in Spring! It's March 21st and today they announced Java 20! It's an exciting time to be a Java developer. Java 20, of course, is just another amazing installment before Java 21, which comes out in six short months, including Project Loom. And, of course, Spring Framework looks set to provide integrations with it in Spring Framework 6.1. It's an amazing time to be a Java and Spring Boot developer!

• In my latest installment of Spring Tips, I look Vaadin Flow and Spring Boot 3
• I did a video introducing Spring Boot 3 for the fine folks over at Jetbrains a few weeks ago. People seem to love it. Maybe you will too?
• In the comments for this video, a viewer from Columbia asked me to do a video introducing Spring Webflux and I remembered I've done a ton of videos on reactive programming with Spring Boot, including this one, that people seemed to like from 2019
• …

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 extends CrudRepository<Employee, Long> {

    @Query("select e from Employee e where e.firstName = :firstName")
    List<Employee> findCustomEmployees(String firstName, Sort sort);

}

Spring Data JPA will turn this custom query into a JPA query when provided not just with a criteria (firstName) but also a custom sort via findCustomEmployees("Alice", Sort.by("lastName"))…

Hi, Spring fans! In this installment, we'll look at the fantastic Vaadin Flow library, which has recently been updated for Spring Boot 3, and how it can help you be happier.

the code is available, as usual, here

this episode features special guest Marcus Hellberg, VP developer relations from Vaadin, and my colleague Tiffany Jernigan

NO DEVELOPER ADVOCATES WERE HARMED IN THE MAKING OF THIS VIDEO