Advent Calendar – 2025 – Detail Dialog – Part 2 Client contract from a UI perspective In this project, the user interface not only serves as a graphical layer on top of the backend, but is also part of the overall contract between the user, the client, and the server. This part focuses on the data…

Advent Calendar – 2025 – Detail Dialog – Part 1 Classification and objectives from a UI perspective Today's Advent Calendar Day focuses specifically on the interaction level prepared in the previous parts. While the basic structure of the user interface and the layout were defined at the…

Advent Calendar – 2025 – Persistence – Part 02 Today, we will finally integrate the StoreIndicator into the UI. Vaadin integration: live status of the store Implementation of the StoreIndicator Refactoring inside – The MappingCreator as a central logic. EclipseStore – The Persistent Foundation…

Advent Calendar – 2025 – Persistence – Part 01 Visible change: When the UI shows the memory state With the end of the last day of the Advent calendar, our URL shortener was fully functional: the admin interface could filter, sort, and display data page by page – performant, cleanly typed, and…

Advent Calendar – 2025 – Filter & Search – Part 02 In the previous part, we looked at the implementation on the server side. This part is now about the illustration on the user page. The source code for the initial state can be found on GitHub under . The following screenshot shows this state of…

Advent Calendar – 2025 – Filter & Search – Part 01 With the Vaadin interface described in [Part III], our URL shortener has a fully functional administration console available for the first time. It allows viewing existing short links in tabular form and managing them manually. But after just a…

Introduction to the URL‑Shortener Advent Calendar 2025 December 2025 is all about a project that has grown steadily in recent months: the Java-based URL Shortener, an open-source project implemented entirely with Core Java, Jetty, and Vaadin Flow. The Advent calendar accompanies users every day…

For my German followers - Vaadin Flow Tutorial: Starte deine Java Web App mit meinem Template-Projekt - no Spring / JakartaEE - www.youtube.com/watch?v=Vq4Z... #vaadin #java

#java #sse #realtime #events

#Java #Flow #Processor - Old but powerful tools inside the #JDK

Signal via SSE, data via REST – a Vaadin demonstration in Core Java 1. Introduction 1.1 Motivation: Event-driven updating without polling In classic web applications, the pull principle still dominates: Clients repeatedly make requests to the server to detect changes. This polling is simple, but…

#java #vaadin #designpattern #observer svenruppert.com/2025/09/01/h...

svenruppert.com/2025/08/29/p... #security #hashing #java #cybersecurity #coding

Next part of the series about URL-shortener. Now, we are connecting the Service with a WEB-UI based on #vaadin flow. svenruppert.com/2025/08/15/p... #java #vaadin

Would you like to participate for winter training in Germany and Swedish Lapland next winter? - ping me :.-) #winter #arctic #arcticadventure #nevergiveup #adventuretravel #adventure #nature #bushcraft #survival #lappland #arcticcircle #germany

Just for #fun - an short #video on #youtube showing #bumblebees in action - youtu.be/1ba0ozBOYc0 #ASMR #NatureVideo #Bumblebees #Pollinators #SlowTV #Mindfulness #Buzzing #MacroVideo #FieldRecording #Insects #Wildlife #macro

How to connect a @vaadin.com flow ap with a rest service in core #java svenruppert.com/2025/06/24/c...

www.youtube.com/watch?v=u-tS... #hashmap #java #german #youtube

svenruppert.com/2025/06/10/s... #java #architecture #security

for my german reading followers.. Mutable hashCode() + HashMap-Key = ⚠️ Gefahrenquelle Wer veränderliche Objekte als Schlüssel verwendet, riskiert unsichtbare Einträge und vieles mehr #Java #Security #MutableKey javapro.io/de/wenn-hash... #java #hashmap #mutable #vaadin

Mutable hashCode() in Java keys = recipe for disaster ☠️ #JavaSecurity #HashMap #Java #SecureCoding #Vaadin @vaadin.com svenruppert.com/2025/06/06/i...

for my german reading follower.. published a post about CWE-22 CWE-377 and CWE-778 and how to harden against it. The demo is written in @vaadin.com Flow. javapro.io/de/erstellen... #vaadin #java #securecoding #cybersecurity #owasp

Secure file handling with Vaadin Flow. Focused on: 🔐 CWE-22 – Path Traversal 📁 CWE-377 – Unsafe temp files 📉 CWE-778 – Weak logging Use Java, NIO and structured logging to build safe upload/download flows. #JavaDev #Vaadin #SecureSoftware #WebSecurity svenruppert.com/2025/05/20/c...

#java #workshop #secure #coding jugsaxony.org/timeline/202...

me, coding on my new idea right now.. ;-) #java #security #ai #motivation

for the german readers: my latest article on @golemde.bsky.social - about @eclipsestore.bsky.social #java #performance #persistence www.golem.de/news/eclipse...

It was a great #team Here we are on the way back to the #basecamp to switch from #pulka to #backpack for the next #training unit - #night #navigation in the field with #magnetic anomalies // #motivation #nevergiveup #TeamBuilding #lappland #arcticcircle #winter

Just published something for the Core Java nerds 🤓 Built a tiny REST API using HttpServer, then injected logging behavior at runtime using a Java Agent. 🧠 100% JDK-only. No libs. No frameworks. 📖 svenruppert.com/2025/04/11/o... #java #bytecode #instrumentation #jvm #agent #corejava

Java devs: ever wondered what really happens behind .parallelStream().collect(...)? I dove into how parallel collectors work, when they’re safe, and when they quietly betray your data. svenruppert.com/2025/04/08/s... #java #streams #parallels #devwriting

Remember when DNS was “just” the phonebook of the internet? Now it’s a battleground. From spoofing to hijacking – if you touch packets, you need to know these attack vectors. Wrote a deep dive (yes, with Java code too): 🔗 svenruppert.com/2025/04/07/d... #dns #security #java #networking #devs

#Java Cryptography Architecture (JCA) - An Overview Provider-based crypto framework enables secure hashing, digital signatures, key management & more — all modular, extensible, and ready for real-world security needs. #JavaSecurity #Cryptography #JCA #SecureCoding svenruppert.com/2025/04/03/j...

Java - Gatherer: a powerful new way to control Stream aggregation! Inject, filter, finish early – even in parallel. No frameworks. Pure Java. Learn how it works #Java #StreamsAPI #Gatherer #JavaDev #Streams #java24 svenruppert.com/2025/04/02/r...

#Streams in #Java have been available since #Java8 and are still receiving new features up to #Java24. In this first blog post in the series on streams, I'll start with streams, provide an overview, and show the first steps with gatherers... svenruppert.com/2025/03/29/f...

long long time ago.. ;-) this was a cool shirt.. #atlassian #conference #java @svenpet.bsky.social

Boosting the Concurrency TornadoVM is an open-source framework that extends the Java Virtual Machine (JVM) to support hardware accelerators such as Graphics Processing Units (GPUs), Field-Programmable Gate Arrays (FPGAs), and ... #java #tornadovm #performance #jvm svenruppert.com/2024/11/23/tor

Cache Poisoning Attacks on Dependency Management Systems like Maven Cache #poisoning on #Maven Caches is a specific attack that targets how Maven #Caches manages packages and dependencies ... #Man-in-the-Middle #Cache … #java #security #securecoding #devsecops svenruppert.com/2024/11/13/cac

Exception article on our pure #Java build tool bld, this author really gets it! svenruppert.com/2024/09/26/b...

JUnit annotations in focus: The connection between @Test and @testable The annotations @Test and @testable have played an important role in the Java ecosystem regarding application testing. They are essential tools ... #java #tdd #junit5 svenruppert.com/2024/11/08/j...

The Risks of Mocking Frameworks: How Too Much Mocking Leads to Unrealistic Tests svenruppert.com/2024/11/05/t... #java #mockito #tdd

Das NIO-Paket von Java bietet robuste Tools zum Ändern der Datei- und Pfadnamen, mit denen Developer die Risiken durch Path Traversal (CWE-22) mindern können. #Softwareentwicklung

The History of Parallel Processing in Java: From Threads to Virtual Threads Since the early days of computer science, parallel processing has represented ... svenruppert.com/2024/11/01/t... #java #concurrency #streams #threads #virtual

Understanding TOCTOU (Time-of-Check to Time-of-Use) in the Context of CWE-377 - svenruppert.com/2024/10/07/u...

Bald auf meinem YT-Kanal - Winter - Overnighter bei -25C in schwedisch Lappland.. youtu.be/88IbeITAFw8

#Testcoverage in #Java , Compare #propertybased, #linecoverage and #mutation test coverage.. svenruppert.com/2024/05/31/c...

#maven and #security - #cache related #risks - svenruppert.com/2024/05/27/s...

Understanding and Mitigating CWE-416: Use After Free Vulnerabilities in Java - svenruppert.com/2024/05/17/c... #java #security #securecoding

Some basics about the Gauss-Krüger Coordinate System.. svenruppert.com/2024/05/16/b... #navigation #coordinates #wgs84 #bessel1841 #mercartor

🚀 Ready to supercharge your Java applications? Discover the latest in off-heap memory management with Java 21! From ByteBuffer to the new Foreign Function & Memory API, unlock unparalleled performance and efficiency. 🌟 #Java21 #HighPerformance #OffHeapMemory #JavaDev svenruppert.com/2024/05/15/c...

Unlock the secrets of your software! Dive into my latest blog post about logging svenruppert.com/2024/05/06/d... #logging #java #securecoding