The Spring team wants to hear from you!

Engineering | Ben Wilcock | July 14, 2020 | ...

The “State of Spring 2020” report will be published soon, based on the views and experiences of Spring Boot development experts across the globe. In exchange for 15 minutes of your time to complete the survey, you’ll be among the first to receive the survey report and the insights included in it. Please feel free to share this email with your Spring development colleagues. The survey will close at the end of July.

Take the survey now.

Thanks for sharing your thoughts and experiences with us! The Spring Team

Building web applications with Spring Boot and Vaadin

Engineering | Stéphane Nicoll | July 14, 2020 | ...

This post is a guest post by community member Marcus Hellberg (@marcushellberg). Marcus is the head of the Community team at Vaadin. He likes helping developers discover and learn modern web technologies by creating online content and speaking with developers at events.

Building web apps can be a daunting task. There are many moving parts: you need to define the structure in HTML and then use CSS to make it look the way you want. For frontend apps, you also need to write the app logic in JavaScript and connect it to your backend over REST. And of course, you also need to implement the…

Introducing Java Functions for Spring Cloud Stream Applications - Part 0

Releases | David Turanski | July 13, 2020 | ...

We are happy to announce the release of Spring Cloud Stream applications 2020.0.0-M2. This release is a complete overhaul of the legacy Spring Cloud Stream App Starters. Starting with this release, we are moving away from theme-oriented release train names (famous scientists in alphabetical order) to calendar based versioning. The current GA release is called Einstein, and we are pleased to introduce 2020.0.0-M2. We are also moving away from the app starters. Having reorganized, repackaged, and (in some cases) rewritten the underlying code, we now have a new Git repository: spring-cloud/stream…

First milestone of Reactor 2020.0 (Codename Europium)

Engineering | Simon Baslé | July 10, 2020 | ...

Earlier this month, we released a first milestone of Reactor 2020.0. This cycle, codename Europium, follows the Dysprosium one (which included reactor-core 3.3.x and reactor-netty 0.9.x).

It includes reactor-core 3.4.0 and reactor-netty 1.0.0.

In this blog post, we'll cover a few highlights of the reactor-core milestone, and briefly mention what's in store for M2.

For reactor-netty, we'll link to a separate blog post here as soon as it is out.

Note also that there is a new versioning scheme in place, which has been adopted accross the Spring portfolio: see the reference guide and this blog post

This Week in Spring - July 7th, 2020

Engineering | Josh Long | July 06, 2020 | ...

Hi, Spring fans! What a crazy week it's been! How are you? I hope you're safe, healthy, happy.

I'll be speaking later today (Tuesday) at the Accento Digital conference and at the Jetbrains Java Day online event on the 10th (Friday). Both of these should be accessible from EMEA and APJ timezones. I look forward to seeing you there!

We've got a ton of good stuff to get to this week so let's get to it!

Spring Security 5.4.0-M2 Released

Releases | Josh Cummings | July 02, 2020 | ...

On behalf of the community, I’m pleased to announce the release of Spring Security 5.4.0-M2! You can find the complete details in the release notes and the highlights below:

OAuth 2.0

gh-8700 - OAuth2AuthorizedClientArgumentResolver picks up OAuth2AuthorizedClientManager bean
gh-8730 - Add JWTProcessor Configuration Post-Processor
gh-8669 - OAuth2AuthorizedClientArgumentResolver for XML
gh-8587 - Add ServerRequestCache setter in OAuth2AuthorizationCodeGrantWebFilter
gh-8603 - oauth2Client Test Support no longer requires an HttpSessionOAuth2AuthorizedClientRepository
gh-8501 - Add issuerUri to…

This Week in Spring - June 30th, 2020

Engineering | Josh Long | July 01, 2020 | ...

Hi, Spring fans! Welcome to another installment of This Week in Spring! What a wonderful week it's been and it's only Tuesday! I spoke to folks in Switzerland on Monday, had a few awesome meetings with folks later, then today spoke to folks in Germany in the morning and then folks in APJ (Singapore, mostly) in the evening. And tomorrow, I'm speaking at the JPoint virtual conference about Bootiful Kotlin. I'd love to see you there!

Now then, we've got a ton of things to look at this roundup so let's get to it!

URL Matching with PathPattern in Spring MVC

Engineering | Rossen Stoyanchev | June 30, 2020 | ...

The recent Spring Framework 5.3 M1 release announcement mentions "Spring MVC comes with PathPattern parsing for efficient URL matching". This post expands on that with more context and detail.


In Spring applications AntPathMatcher is used to identify classpath, file system, remote, and other resources in Spring configuration. It has also been used in Spring MVC to match URL paths. Over time the use of patterns in web applications grew in number and syntax with AntPathMatcher evolving to meet those needs but some pain points remain without a solution:

  1. In web applications, patterns need to be matched many times per request and therefore any gains in performance and efficiency matter. However String pattern matching limits what can be achieved.

  2. Choosing the most specific pattern among several that match a request has proven challenging over the years with no simple ways to make it more predictable without impacting other cases.

  3. Matching a String path to a String pattern makes it difficult to avoid URI encoding issues. For example should the incoming path be decoded first and then matched? That allows for patterns themselves to be declared without encoded characters, but what if the request path contains %2F or %3B which are / and ; respectively? Once decoded those alter the structure of the path making it harder to match reliably. We could leave the request path encoded via UrlPathHelper#urlDecode

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