Want to check schema compatibility with JSON payloads? Not so easy... dastalvi.com/blog/default...

Integrations can break on things that schemas don't catch dastalvi.com/blog/semanti...

Java 25 - what and why YouTube video by Marián Varga

My quick overview of Java 22-25: youtu.be/OLCBt_U-wFY

Java 25 - what and why, Thu, Feb 5, 2026, 6:00 PM | Meetup Hello Java developers, We are happy to announce our first online Java Meetup. If you haven’t had a chance to meet us in Bratislava before, this is your opportunity to join

I invite you to the online talk where I will present my personal view of #Java 25
www.meetup.com/meetup-group...

Think about negative scenarios. Don't kill the bearer of the bad news!
dastalvi.com/blog/dont-ki...

APIs in the context of DDD with Otavio Santana YouTube video by Marián Varga

a video about #DDD and #integration with Otavio Santana
www.youtube.com/watch?v=dk7I...

see also
speakerdeck.com/otaviojava/f...
dzone.com/articles/fou...
love2integrate.com

dastalvi.com/blog/api-kil...
A quick summary of approaches to maintain data consistency in distributed systems

dastalvi.com/blog/why-did...

The first copies of Mastering #RESTful #webservices with #Java have just arrived! (See more at love2integrate.com)

javapro.io/2025/08/06/j...

Can an application suffer from jet lag? Originally posted on https://dastalvi.com/blog/api-timezones/ When designing APIs and data models, I prefer simplicity and avoid ambiguity.

www.linkedin.com/pulse/can-ap...

API killed the transaction star Building applications from various services is common today. This can mean using a microservices...

dev.to/marianvarga/...

Should we echo POST and PUT requests? There is a common REST API design practice developers often apply without much thinking. When...

dev.to/marianvarga/...

OpenAPI examples are like comments For projects involving a lot of integration I recommend to use the specification-first approach,...

Can you rely on examples in OpenAPI specifications?
dev.to/marianvarga/...

Do you think that #Microservices failed? Think again before your back-to-monolith project fails...
dastalvi.com/blog/conways...

With François Martin, a JCON Europe 2025 speaker, about Java&JavaScript automated testing tools YouTube video by Marián Varga

At this year's JCON Europe conference I saw François Martin's session "From Bugs to Brilliance: Testing Toolbox in Action".
I used the opportunity to ask François a few additional questions about #testing #Java and #JavaScript applications in an interview.
youtu.be/RYdN6hv09s4

You should love standards YouTube video by Marián Varga

My interview with Dirk Weil about #integration-related aspects of #JakartaEE and #MicroProfile
youtu.be/Sv6FyBmAyF4

With Simon Martinelli about service granularity and domain knowledge YouTube video by Marián Varga

My interview with @martinelli.ch about Conway's law as a criterion for service granularity, need for developers to know the domain and integrating frontends using self-contained systems.
youtu.be/-svUNhX9fyU

With Silvio de Morais about the overlaps of AI and integration YouTube video by Marián Varga

My interview with Silvio de Morais, a co-author of our book Mastering #RESTful Web Services with #Java about the overlaps between #AI and #integration.

youtu.be/g2t57Bl9ss4

I will lead mentoring sessions "Contracting and book writing why & how" at #JCON2025 in Cologne.

Working as a #contractor / #freelancer has some pros&cons in comparison to being employed. Becoming a book #author is one very special channel of personal branding.

Come to ask anything!

Fake it or break it? Resorting to a dynamic #schema in your #API may be hiding a lack of business analysis
www.linkedin.com/pulse/fake-b...

Hexagonal+optimistic may not be easy Hexagonal or ports & adapters architecture is commonly used to structure the services so that...

How to avoid concurrent updates overwriting each other's data in a ports&adapters architecture?

dev.to/marianvarga/...

See my blog post about why investing in specification-first makes your API more future-proof
dastalvi.com/blog/what-is...
#api #openapi #java

What is a URL? We type it multiple times every day, we call it "a link" or "a web address", yet how many of us...

"What is a URL?" My blog post showing why you should not design #REST #API endpoints blindly
dev.to/marianvarga/...

Writing a book. Does it make you rich and famous? (#67) YouTube video by Frank Delporte

Talking about my book at
@frankdelporte.be 's podcast
youtu.be/xhEiXA8ImJo?...

12 overlooked API details that can get you in trouble @ Java Bratislava Meetup YouTube video by Marián Varga

12 overlooked API details that can get you in trouble
youtu.be/MgXMiG7a9ss
My talk about #API details worth paying attention to, this time a little bit longer at the Bratislava #Java Meetup

Marián Varga on LinkedIn: Virtual threads are Java's new garbage collector Virtual threads are a much-discussed feature of the coming Java 21. Here is how I look at Virtual threads: https://lnkd.in/eFpV2eiq

www.linkedin.com/posts/mari%C...

What can happen if you skip the DTOs It is nice that a framework like SpringBoot can do so many things for you. You just need a JPA...

dev.to/marianvarga/...

Interview with Andres Sacco about integration testing with Karate YouTube video by Marián Varga

With distributed applications communication and integration via APIs is essential, simple (J)unit tests most developers are familiar with are not enough.
I learned about the Karate framework from the Andres Sacco's talk and asked him some follow up questions.
youtu.be/PjwvMbEBf5w