Sven Woltmann
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svenwoltmann.bsky.social
Sven Woltmann
@svenwoltmann.bsky.social
Scalable, reliable and maintainable Java backend applications | Software Architecture & Development | Freelancer, Trainer, Speaker @ HappyCoders.eu
🎤 Heute auf dem JUG Saxony Day: Hexagonale Architektur – robust, testbar, zukunftssicher.

Statt starrer Schichten stehen Schnittstellen im Fokus: Fachlogik im Zentrum, Infrastruktur sauber gekapselt, klare Dependencies. Ergebnis: Systeme, die sich leichter warten, testen, anpassen lassen.

#JSD2025
September 26, 2025 at 10:23 AM
🚀 Java 25 has been released today!

New features include:

* Scoped Values
* Compact Source Files & Instance Main Methods
* Flexible Constructor Bodies
* Compact Object Headers

All details here:
www.happycoders.eu/java/java-25...

Updated Java Versions PDF:
www.happycoders.eu/java-versions/

#Java
Java 25 Features (with Examples)
Java 25: Scoped Values, Module Import Declarations, Compact Source Files, Instant Main Methods, Flexible Constructor Bodies, Compact Object Headers and more...
www.happycoders.eu
September 16, 2025 at 11:49 AM
New Java syntax ahead: Derived Record Creation Expressions (Withers).

Learn how this upcoming preview feature (JEP 468) introduces a concise way to create new records by only specifying changed fields – no more boilerplate wither methods.

Full guide:
👉 www.happycoders.eu/java/withers...
Withers in Java: “Derived Record Creation Expressions”
Learn how Withers and Derived Record Creation Expressions Simplify Java Records, Avoid Boilerplate, and Make Working with Immutable Data Structures Easier.
www.happycoders.eu
September 4, 2025 at 6:21 AM
Java 25 enters Rampdown Phase One – and is packed with features:

✅ Scoped Values
✅ ​Compact Source Files + Instance Main Methods
✅ Flexible Constructor Bodies
✅ Stable Values (Preview)
✅ Structured Concurrency revamp

Full overview:
👉 www.happycoders.eu/java/java-25...

#Java #Java25
Java 25 Features (with Examples)
Java 25: Scoped Values, Module Import Declarations, Compact Source Files, Instant Main Methods, Flexible Constructor Bodies, Compact Object Headers and more...
www.happycoders.eu
June 5, 2025 at 8:25 AM
🎉 30 Jahre Java – und ich durfte dabei sein!

In der aktuellen Ausgabe des Javamagazins (6/2025) blicke ich gemeinsam mit anderen ExpertInnen auf Höhen und Tiefen, Meilensteine, Lieblingsfeatures aus drei Jahrzehnten Java zurück.

#Javamagazin #Java #Java30 #JavaCommunity
May 26, 2025 at 7:28 AM
Struggling with thread-safe lazy initialization and can’t wait for #StableValues? Two new articles cover Double-Checked Locking and the Initialization-on-Demand Holder idioms in Java:

www.happycoders.eu/java/double-...

www.happycoders.eu/java/initial...

#Java #StableValues #DoubleCheckedLocking
Double-Checked Locking in Java
Discover the Double-Checked Locking pattern in Java: Optimize thread-safe, lazy object initialization without performance losses.
www.happycoders.eu
May 9, 2025 at 6:56 AM
Just published:

"Stable Values in Java 25: Finally Initialize Values Safely!"

Learn how this new preview feature solves common multi-threading initialization problems. No need to wait for Java 25 - get the details now!

www.happycoders.eu/java/stable-...

#Java #Java25 #StableValues
Stable Values in Java - Finally Initialize Values Safely!
What are Stable Values and how do you use them? What are Stable Lists, Stable Maps, and Stable Functions? How do Stable Values work internally?
www.happycoders.eu
April 9, 2025 at 10:09 AM
Reposted by Sven Woltmann
Thanks to everyone that joined the @javaland.bsky.social Jogging for an 8Km run this morning

#JavaLand #jatumba #runWithJakartaEE
April 2, 2025 at 7:19 AM
Reposted by Sven Woltmann
March 29, 2025 at 6:04 AM
Reposted by Sven Woltmann
Whatever happens is the only thing that could have! Proud of the 2025 agenda, thank you all! And special kudos to @ixchelruiz.bsky.social for taking care of the marketplace!
March 30, 2025 at 1:41 PM
Wow! Thrilled to see that my talk about #StreamGatherers at #Javaland 2025 is completely full! If you missed it, you can read all about Stream Gatherers here: www.happycoders.eu/java/stream-...
April 2, 2025 at 7:48 AM
Reposted by Sven Woltmann
Sehr interessanter und kurzweiliger Vortrag von Sven Woltmann zur neuen Stream Gatherer API in Java 23. Das war der perfekte Einstieg in unser neues JUG Jahr 😁 #java #jug #happycoders
January 15, 2025 at 8:12 PM
Reposted by Sven Woltmann
Am 6. März 2025 um 18:30 sind wir bei der Europace AG mit einem Talk-Doppelpack „Hexagonal Architecture und Mutation Testing“. Zwei Vorträge – einer von Sven Woltmann und einer von Dehla Sokenou. Wir freuen uns auf Euch! www.meetup.com/de-DE/jug-bb...
Doppelpack: Hexagonal Architecture und Mutation Testing, Do., 6. März 2025, 18:30 | Meetup
Am 6. März haben wir einen Doppelpack an Vorträgen zusammen mit unseren Partner, der Eurospace AG. **Die Vorträge** 1. Hexagonale Architektur: Robuste Software dank Schni
www.meetup.com
February 25, 2025 at 9:09 AM
Reposted by Sven Woltmann
Unsere erste Veranstaltung für 2025 ist online. Wir beginnen das Jahr mit Stream Gatherers und wie man sie auch selber schreiben kann. Sven Woltmann wird dafür am 15.01.2025 nach Hamburg zur adesso GmbH kommen. :-)
=> www.meetup.com/de-DE/jug-ha...
Java User Group Hamburg | Meetup
Die Java User Group in Hamburg richtet sich an alle Enthusiasten, Neulinge und Interessierte rund um das Thema Java und Softwareentwicklung in und um Hamburg. Auf Treffen werden Java- und technologiev...
www.meetup.com
December 27, 2024 at 4:44 PM
Reposted by Sven Woltmann
Sven Woltmann @svenwoltmann.bsky.social ist auf der #JavaLand 2025 mit seinem Vortrag "Stream Gatherers: Schreibt eure eigenen, leistungsstarken Stream-Operationen!" dabei. Ihr auch? scomp.ly/EgVA1lQ
February 7, 2025 at 12:14 PM
🚀Java 24 has been released today!

New features include:

* Stream Gatherers
* Virtual Thread Sync without Pinning
* Compact Object Headers

Get all details here:
www.happycoders.eu/java/java-24...

Get my updated Java Versions PDF Cheat Sheet here:
www.happycoders.eu/java-versions/

#Java #Java24
March 18, 2025 at 8:10 AM