The Spring Blog

On behalf of the community, I am pleased to announce that the Release Candidate 1 (RC1) of the Spring Cloud Greenwich Release Train is available today. The release can be found in Spring Milestone repository. You can check out the Greenwich release notes for more information.

End of Life (EOL) Reminder

The Dalston release train will reach EOL status at the end of 2018.

Notable Changes in the Greenwich Release Train

This milestone is compatible with Spring Boot 2.1.1.RELEASE. Updates were made across the projects for Java 11 compatibility.

It’s my pleasure to announce the first milestone of Spring Data R2DBC. Spring Data R2DBC is Spring’s client project for R2DBC. With Spring Data R2DBC you get end to end reactive ad-hoc query execution and Spring Data repositories for relational databases.

Spring Data R2DBC embraces functional-reactive integration of relational databases by providing DatabaseClient as its central abstraction. The following example shows how to bootstrap DatabaseClient without spinning up a Spring context:

PostgresqlConnectionFactory connFactory = new PostgresqlConnectionFactory(
  PostgresqlConnectionConfiguration.builder()
    .host(…)
    .database(…)
    .username(…)
    .password(…)
    .build());

DatabaseClient databaseClient = DatabaseClient.create(connFactory);

Hi Spring fans! In this installment of Spring Tips we look at how to use Spring to work with infrastructure on the Google Cloud Platform (GCP)

speaker: Josh Long

Hi Spring fans and welcome to another installment of This Week in Spring! This week I’ve been in Seattle, WA and now I’m off to Toronto, Canada for the epic SpringOne Tour Toronto edition, the last SpringOne Tour for the year, too! (Can you believe we’re now less than 22 days from 2019? Time sure flies when you’re having fun!)

• Spring Tips is back! And what a season have we planned for you! Last week we introduced the first new video, this one looking at the Spring support for Microsoft Azure. As always, you can see the whole playlist at the Spring Tips YouTube Playlist and you should check back on this very blog every Wednesday for the next few months for new installments.
• Spring Data Moore M1 released
• Spring REST Docs 2.0.3.RELEASE
• Spring REST Docs 1.2.6.RELEASE
• RabbitMQ Best Practices
• Reactive Programming and Relational Databases
• Spring IO Platform Cairo-SR6
• Spring Tools 4.0.2 released
• I liked this StackOverflow question and the subsequent answer from JUnit 5 and Spring Test Framework lead Sam Brannen on how to get the effect of @IfProfileValue in a JUnit 5-based Spring application test
• This new change to OpenZipkin supporting correlation of events in the Java Flight Recorder looks very interesting, wouldn’t you say? Any “thumbs up” are appreciated!
• Speaking of Zipkin, it just passed a big milestone: the 10,000th person to star Zipkin on Github!
• Check out this cool feature that makes your Spring Cloud Gateway filters aware of things like path variables
• This looks like it could be an interesting video on Spring transaction management
• Baeldung has a nice post on debugging Reactive Streams in Spring 5
• Knative momentum continues, hits another adoption milestone
• Want to learn more about testing Spring applications? Check out my vJUG talk from a few months ago
• The first commerically supported tracing tool to support Zipkin-formatted data with zero changes, natively, has just been announced: Codecentric’s Instana
• Pivotal have a nice whitepaper on supersonic application development and delivery with Spring Boot and Pivotal Cloud Foundry
• Want to use RabbitMQ in a reactive context - and why wouldn’t you? Now you can! Reactor RabbitMQ 1.0.0 GA is released!
• Not stricly related to Spring, but interesting nonetheless: a non-exhaustive but interesting list of JDBC Driver Connection URL strings
• Auth0 have a nice Spring WebFlux tutorial
• Check out, and feedback, on the new Spring Data Kotlin extension!
• Pivotal announces new serverless framework - Pivotal Function Service
• Demystifying Tracking Event Processors in Axon Framework
• Speaking of Axon, here’s a nice (albeit slightly older) Italian-language post on CQRS with Spring and Axon, or CQRS con Spring e Axon
• The design process is an iterative one. “The most deadly thing in software is the concept.. that you are going to specify what you are going to do, and then do it.” - that from a 1968 NATO Software Engineering Conference!
• This Stackoverflow question, “Why Java takes much more RAM than -Xmx?”, is well worth a read.
• Spring Tools 4.0.2 released, grab the latest
• This project, demonstrating Spring Boot 2, GraphQL, Angular and more, might be helpful if that’s a usecase you have
• Again, not strictly speaking related to Spring, but this is interesting. It’s a look at Java startup time from Java 8 through Java 11
• JaVers 5.0.0 has been released. This major release makes JaVers fully compatible with Spring Boot 2.1 and Spring Framework 5.1. JaVers is a framework to support auditing objects.
• Grails 3.3.9 released with GORM 6.1.11, Spring Boot 1.5.18, Spring 4.3.21.RELEASE

On behalf of the Spring Data team, I’m pleased to announce the availability of the first milestone of the Moore release train.

Notable changes include:

• Support for Streamable wrappers as query method return types.
• Additional Kotlin extensions like CrudRepository.findByIdOrNull(…).
• A Kotlin query DSL for MongoDB (special thanks to Tjeu Kayim)
• Gemfire & Apache Geode upgrades.
• Spatial type support for Neo4j.
• Elasticsearch REST and (initial) reactive client support.
• Support for Redis Streams.
• …and tons of new stuff for Spring Data JDBC.

It’s my pleasure to announce that Spring REST Docs 2.0.3.RELEASE is available from Maven Central, JCenter, and our release repository. My thanks to everyone who contributed to this release by reporting bugs and opening pull requests.

This maintenance release includes a small number of fixes and documentation improvements. It is a recommend upgrade for all Spring REST Docs 2.x users.

GitHub | Issues | Documentation | Twitter | Gitter | Stack Overflow

It’s my pleasure to announce that Spring REST Docs 1.2.6.RELEASE is available from Maven Central, JCenter, and our release repository. My thanks to everyone who contributed to this release by reporting bugs and opening pull requests.

This maintenance release includes a handful of bug fixes and documentation improvements. It is a recommend upgrade for all Spring REST Docs 1.x users.

GitHub | Issues | Documentation | Twitter | Gitter | Stack Overflow

Imperative code eats threads at the pace of incoming requests while Software is eating the world. This post discusses the assumptions for reactive programming on the JVM and what this means for integrations – in particular, relational databases.

The motivation to come up with a post is the constant increase in reactive programming adoption while some major building blocks are not yet available – in particular, the question: What about relational databases?

What is Reactive Programming

There are a lot of answers about what Reactive Programming is and how this compares to Reactive Systems. I see Reactive Programming as a programming model that facilitates scalability and stability by creating event-driven non-blocking functional pipelines that react to availability and processability of resources. Deferred execution, concurrency and asynchronicity are only a consequence of the underlying programming model.