Markus Eisele
@myfear.com
Developer, turned to consulting, developer relations, sales, and landed in marketing.
Writing books for #Oreilly.
Into Java, Kubernetes and such.
Legal called to tell you that I'm not officially speaking for IBM.
Writing books for #Oreilly.
Into Java, Kubernetes and such.
Legal called to tell you that I'm not officially speaking for IBM.
Pinned
Markus Eisele
@myfear.com
· Nov 18
My new book with Alex Soto Bueno and Natale Vinto just dropped:
Applied AI for Enterprise Java
The practical field guide for Java developers bringing AI to production.
Full story (and how it came to life between family, travel, and too much coffee):
buff.ly/2iDl9ba
#Java #AI #Quarkus #LangChain4j
Applied AI for Enterprise Java
The practical field guide for Java developers bringing AI to production.
Full story (and how it came to life between family, travel, and too much coffee):
buff.ly/2iDl9ba
#Java #AI #Quarkus #LangChain4j
A complete Quarkus tutorial that builds a global event orchestrator — Quartz scheduling, WebSockets, PostgreSQL Dev Services, and a live 3D globe to visualize deliveries.
If you want to level up your time-zone aware scheduling in Java, this one’s for you.
🔗 buff.ly/ZM4r2tn
#Java #Quarkus #Backend
If you want to level up your time-zone aware scheduling in Java, this one’s for you.
🔗 buff.ly/ZM4r2tn
#Java #Quarkus #Backend
December 31, 2025 at 7:15 AM
A complete Quarkus tutorial that builds a global event orchestrator — Quartz scheduling, WebSockets, PostgreSQL Dev Services, and a live 3D globe to visualize deliveries.
If you want to level up your time-zone aware scheduling in Java, this one’s for you.
🔗 buff.ly/ZM4r2tn
#Java #Quarkus #Backend
If you want to level up your time-zone aware scheduling in Java, this one’s for you.
🔗 buff.ly/ZM4r2tn
#Java #Quarkus #Backend
Your JVM shouldn’t guess container limits.
Auto-tune memory usage in Quarkus with Microsoft JAZ.
buff.ly/cUnSxgd
Auto-tune memory usage in Quarkus with Microsoft JAZ.
buff.ly/cUnSxgd
Supercharge Your Quarkus Containers: Auto-Tune JVM Memory with Microsoft JAZ
A hands-on guide for Java developers: Smarter heap sizing, zero manual tuning, and rock-solid stability inside containers.
buff.ly
December 30, 2025 at 5:02 PM
Your JVM shouldn’t guess container limits.
Auto-tune memory usage in Quarkus with Microsoft JAZ.
buff.ly/cUnSxgd
Auto-tune memory usage in Quarkus with Microsoft JAZ.
buff.ly/cUnSxgd
Reposted by Markus Eisele
I hope I'm not the only one who sometimes wonders: "What is my Java application doing right now?" When you don't see any output. This is where my tiny tool called JStall comes in, as you can read in my blog post at mostlynerdless.de/blog/2025/12...
Quickly Inspect your Java Application with JStall - Mostly nerdless
Learn about JStall, a tool that helps you quickly answer the question: "What is my Java application doing right now?"
mostlynerdless.de
December 30, 2025 at 11:11 AM
I hope I'm not the only one who sometimes wonders: "What is my Java application doing right now?" When you don't see any output. This is where my tiny tool called JStall comes in, as you can read in my blog post at mostlynerdless.de/blog/2025/12...
AI isn't just a feature anymore. It's your infrastructure. And it has a massive attack surface.
From prompt injection to model poisoning, are you actually ready to secure your LLM integrations?
ICYMI: A guide to the new security reality for Java developers.
🔗 buff.ly/0Yl77jk
#AI #Java #InfoSec
From prompt injection to model poisoning, are you actually ready to secure your LLM integrations?
ICYMI: A guide to the new security reality for Java developers.
🔗 buff.ly/0Yl77jk
#AI #Java #InfoSec
December 30, 2025 at 11:00 AM
AI isn't just a feature anymore. It's your infrastructure. And it has a massive attack surface.
From prompt injection to model poisoning, are you actually ready to secure your LLM integrations?
ICYMI: A guide to the new security reality for Java developers.
🔗 buff.ly/0Yl77jk
#AI #Java #InfoSec
From prompt injection to model poisoning, are you actually ready to secure your LLM integrations?
ICYMI: A guide to the new security reality for Java developers.
🔗 buff.ly/0Yl77jk
#AI #Java #InfoSec
Java + scripting vibes?
JBang makes it real.
I wrote a hands-on walkthrough showing how to build real tools in a single Java file—CLI apps, API callers, even tiny Quarkus services.
Fast, fun, and surprisingly powerful.
Read it here:
buff.ly/5ozu1Zl
#Java #JBang #Coding #DX #Quarkus
JBang makes it real.
I wrote a hands-on walkthrough showing how to build real tools in a single Java file—CLI apps, API callers, even tiny Quarkus services.
Fast, fun, and surprisingly powerful.
Read it here:
buff.ly/5ozu1Zl
#Java #JBang #Coding #DX #Quarkus
December 30, 2025 at 7:15 AM
Struggling with the Spring -> Quarkus jump? You don't need a total rewrite.
I broke down the 10 essential bridge extensions that let you keep your existing knowledge while gaining that sweet startup speed.
🚀 If you missed this guide, grab it now: buff.ly/L6PZV12
#Java #Quarkus #SpringBoot #Legacy
I broke down the 10 essential bridge extensions that let you keep your existing knowledge while gaining that sweet startup speed.
🚀 If you missed this guide, grab it now: buff.ly/L6PZV12
#Java #Quarkus #SpringBoot #Legacy
December 29, 2025 at 2:39 PM
Struggling with the Spring -> Quarkus jump? You don't need a total rewrite.
I broke down the 10 essential bridge extensions that let you keep your existing knowledge while gaining that sweet startup speed.
🚀 If you missed this guide, grab it now: buff.ly/L6PZV12
#Java #Quarkus #SpringBoot #Legacy
I broke down the 10 essential bridge extensions that let you keep your existing knowledge while gaining that sweet startup speed.
🚀 If you missed this guide, grab it now: buff.ly/L6PZV12
#Java #Quarkus #SpringBoot #Legacy
Reposted by Markus Eisele
A very interesting read from @thedonraab.bsky.social, as always!
I asked and answered only one question in StackOverflow in 2025. I got some great advice from @shipilev.bsky.social which helped me do the necessary research to answer my own question. I even got comfortable building from source to see some new JOL improvements. 🙏
stackoverflow.com/questions/79...
stackoverflow.com/questions/79...
Does Java Object Layout (JOL) work with Java 25 and Compact Object Headers enabled?
Java 25 was released on September 16, 2025 and included JEP 519 with Compact Object Headers (COH). The latest release version of JOL (0.17) has been released in February, 2023.
I have compared the ...
stackoverflow.com
December 29, 2025 at 7:48 AM
A very interesting read from @thedonraab.bsky.social, as always!
New hands-on guide that shows how to use Virtual Threads in #Quarkus for REST, messaging, and real-world I/O workloads. Clean code. Massive scalability. No reactive overhead.
- @RunOnVirtualThread
- Parallel execution
- Messaging consumers
- Production considerations
buff.ly/gWU6upg
#Java
- @RunOnVirtualThread
- Parallel execution
- Messaging consumers
- Production considerations
buff.ly/gWU6upg
#Java
December 29, 2025 at 7:15 AM
New hands-on guide that shows how to use Virtual Threads in #Quarkus for REST, messaging, and real-world I/O workloads. Clean code. Massive scalability. No reactive overhead.
- @RunOnVirtualThread
- Parallel execution
- Messaging consumers
- Production considerations
buff.ly/gWU6upg
#Java
- @RunOnVirtualThread
- Parallel execution
- Messaging consumers
- Production considerations
buff.ly/gWU6upg
#Java
„Under heavy load, Java’s optimization kicks in. The JIT profiles your hot paths and optimizes them. The garbage collector becomes more efficient. The whole system actually gets better as it warms up.“
buff.ly/5xYBDEa
#Java #Go
buff.ly/5xYBDEa
#Java #Go
buff.ly
December 29, 2025 at 6:08 AM
„Under heavy load, Java’s optimization kicks in. The JIT profiles your hot paths and optimizes them. The garbage collector becomes more efficient. The whole system actually gets better as it warms up.“
buff.ly/5xYBDEa
#Java #Go
buff.ly/5xYBDEa
#Java #Go
ICYMI weekend read:
Build a full-stack Todo app with Quarkus, Panache, Qute, and PostgreSQL.
buff.ly/kQCrQ5C
Build a full-stack Todo app with Quarkus, Panache, Qute, and PostgreSQL.
buff.ly/kQCrQ5C
Build a Full-Stack Todo App with Quarkus, Panache, and Qute
From Zero to Web App with a Reactive Backend, Templated Frontend, and Zero Config PostgreSQL
buff.ly
December 28, 2025 at 4:01 PM
ICYMI weekend read:
Build a full-stack Todo app with Quarkus, Panache, Qute, and PostgreSQL.
buff.ly/kQCrQ5C
Build a full-stack Todo app with Quarkus, Panache, Qute, and PostgreSQL.
buff.ly/kQCrQ5C
The conversations I’ve had this year with Java devs learning Quarkus were remarkably similar.
Different people. Same 10 questions.
And once those questions are answered… Quarkus finally clicks.
I turned all those hallway chats + community threads into one guide:
👉 buff.ly/K8E4hkF
#Quarkus #Java
Different people. Same 10 questions.
And once those questions are answered… Quarkus finally clicks.
I turned all those hallway chats + community threads into one guide:
👉 buff.ly/K8E4hkF
#Quarkus #Java
December 28, 2025 at 7:15 AM
The conversations I’ve had this year with Java devs learning Quarkus were remarkably similar.
Different people. Same 10 questions.
And once those questions are answered… Quarkus finally clicks.
I turned all those hallway chats + community threads into one guide:
👉 buff.ly/K8E4hkF
#Quarkus #Java
Different people. Same 10 questions.
And once those questions are answered… Quarkus finally clicks.
I turned all those hallway chats + community threads into one guide:
👉 buff.ly/K8E4hkF
#Quarkus #Java
File uploads don’t stop at REST endpoints.
SFTP + PostgreSQL + Quarkus Dev Services, end to end.
buff.ly/wOefJJf
SFTP + PostgreSQL + Quarkus Dev Services, end to end.
buff.ly/wOefJJf
SFTP Meets PostgreSQL: Building a Smart File Upload System with Quarkus Dev Services
Most file-handling tutorials stop at REST endpoints and a local filesystem.
buff.ly
December 27, 2025 at 3:01 PM
File uploads don’t stop at REST endpoints.
SFTP + PostgreSQL + Quarkus Dev Services, end to end.
buff.ly/wOefJJf
SFTP + PostgreSQL + Quarkus Dev Services, end to end.
buff.ly/wOefJJf
Reposted by Markus Eisele
Can't wait for the loosened up, non-perfect, but quickly shipped AI-enhanced updates to hit my banking and insurance services next year.
Im sure there will be no issues there at all.
Im sure there will be no issues there at all.
December 26, 2025 at 2:28 PM
Can't wait for the loosened up, non-perfect, but quickly shipped AI-enhanced updates to hit my banking and insurance services next year.
Im sure there will be no issues there at all.
Im sure there will be no issues there at all.
Event Sourcing finally explained in a way Java devs will appreciate.
Records, sealed types, pure folds, #CQRS, projections… all implemented in #Quarkus with real code you can copy and run.
If you're curious how to build clean, data-oriented architectures, here you go:
buff.ly/zpTZdi7
#Java
Records, sealed types, pure folds, #CQRS, projections… all implemented in #Quarkus with real code you can copy and run.
If you're curious how to build clean, data-oriented architectures, here you go:
buff.ly/zpTZdi7
#Java
December 27, 2025 at 7:15 AM
Event Sourcing finally explained in a way Java devs will appreciate.
Records, sealed types, pure folds, #CQRS, projections… all implemented in #Quarkus with real code you can copy and run.
If you're curious how to build clean, data-oriented architectures, here you go:
buff.ly/zpTZdi7
#Java
Records, sealed types, pure folds, #CQRS, projections… all implemented in #Quarkus with real code you can copy and run.
If you're curious how to build clean, data-oriented architectures, here you go:
buff.ly/zpTZdi7
#Java
Time zones don’t fail loudly. They fail silently.
Here’s how to handle dates correctly with Quarkus and Hibernate.
buff.ly/b8N86Fl
Here’s how to handle dates correctly with Quarkus and Hibernate.
buff.ly/b8N86Fl
Time Zones Don’t Have to Be a Nightmare: Handling Dates Properly with Quarkus and Hibernate Panache
Store dates in UTC, convert like a pro, and never mess up a user’s local time again, with just a few lines of code.
buff.ly
December 26, 2025 at 2:01 PM
Time zones don’t fail loudly. They fail silently.
Here’s how to handle dates correctly with Quarkus and Hibernate.
buff.ly/b8N86Fl
Here’s how to handle dates correctly with Quarkus and Hibernate.
buff.ly/b8N86Fl
Ever wondered how conference speaker cards get made?
For jChampions 2026, I automated the whole thing.
Full tutorial + code walkthrough:
buff.ly/dzk2C3I
#Java #Quarkus #DevTools #jChampions
For jChampions 2026, I automated the whole thing.
Full tutorial + code walkthrough:
buff.ly/dzk2C3I
#Java #Quarkus #DevTools #jChampions
December 26, 2025 at 7:15 AM
Ever wondered how conference speaker cards get made?
For jChampions 2026, I automated the whole thing.
Full tutorial + code walkthrough:
buff.ly/dzk2C3I
#Java #Quarkus #DevTools #jChampions
For jChampions 2026, I automated the whole thing.
Full tutorial + code walkthrough:
buff.ly/dzk2C3I
#Java #Quarkus #DevTools #jChampions
GitHub Wrapped 2025 - my Coding Year in Review buff.ly/9oD5XFS
🔥
🔥
GitHub Wrapped 2025 - Your Coding Year in Review
Like Spotify Wrapped, but for your GitHub activity! See your top languages, commit streaks, most productive days, and more in an engaging story format. Get your 2025 coding year in review now.
buff.ly
December 26, 2025 at 6:08 AM
GitHub Wrapped 2025 - my Coding Year in Review buff.ly/9oD5XFS
🔥
🔥
Sometimes REST isn’t enough.
Stream database rows live with Quarkus, Mutiny, and Hibernate Reactive.
buff.ly/7PBXJZm
Stream database rows live with Quarkus, Mutiny, and Hibernate Reactive.
buff.ly/7PBXJZm
Streaming Database Rows in Real-Time with Quarkus, Mutiny, and Hibernate Reactive
Learn how to stream PostgreSQL rows to your browser.
buff.ly
December 25, 2025 at 5:03 PM
Sometimes REST isn’t enough.
Stream database rows live with Quarkus, Mutiny, and Hibernate Reactive.
buff.ly/7PBXJZm
Stream database rows live with Quarkus, Mutiny, and Hibernate Reactive.
buff.ly/7PBXJZm
Build your first reactive messaging app with Quarkus.
I turned a classic “order → kitchen → notification” workflow into a fully reactive pipeline with channels, stream completion, and message transformation. No Kafka needed. Pure Quarkus.
buff.ly/46p0hKI
#Java #Quarkus #ReactiveMessaging
I turned a classic “order → kitchen → notification” workflow into a fully reactive pipeline with channels, stream completion, and message transformation. No Kafka needed. Pure Quarkus.
buff.ly/46p0hKI
#Java #Quarkus #ReactiveMessaging
December 25, 2025 at 7:15 AM
Build your first reactive messaging app with Quarkus.
I turned a classic “order → kitchen → notification” workflow into a fully reactive pipeline with channels, stream completion, and message transformation. No Kafka needed. Pure Quarkus.
buff.ly/46p0hKI
#Java #Quarkus #ReactiveMessaging
I turned a classic “order → kitchen → notification” workflow into a fully reactive pipeline with channels, stream completion, and message transformation. No Kafka needed. Pure Quarkus.
buff.ly/46p0hKI
#Java #Quarkus #ReactiveMessaging
Stop leaking stack traces to production users.
RFC 7807 error handling done right in Quarkus.
buff.ly/jnU2UUP
RFC 7807 error handling done right in Quarkus.
buff.ly/jnU2UUP
Stop Leaking Stack Traces: Mastering RFC 7807 Error Handling in Quarkus
A Hands-On Guide to Building Secure, Standards-Based APIs in Java Without Exposing Your Backend
buff.ly
December 24, 2025 at 2:01 PM
Stop leaking stack traces to production users.
RFC 7807 error handling done right in Quarkus.
buff.ly/jnU2UUP
RFC 7807 error handling done right in Quarkus.
buff.ly/jnU2UUP
Build a Festive Java CLI with Quarkus: The Multifaith Santa-CLI Holiday Tutorial buff.ly/u8YRUjj
December 24, 2025 at 11:15 AM
Build a Festive Java CLI with Quarkus: The Multifaith Santa-CLI Holiday Tutorial buff.ly/u8YRUjj
🎄 Merry Christmas from @quarkusio!
Hibernate with Panache Next is here - unifying blocking & reactive, adding stateless support, type-safe queries with Jakarta Data, and a cleaner repository pattern.
One entity, all modes. Experimental but ready to try!
quarkus.io/blog/hiberna...
#Quarkus #Java
Hibernate with Panache Next is here - unifying blocking & reactive, adding stateless support, type-safe queries with Jakarta Data, and a cleaner repository pattern.
One entity, all modes. Experimental but ready to try!
quarkus.io/blog/hiberna...
#Quarkus #Java
Quarkus Hibernate with Panache Next
Quarkus: Supersonic Subatomic Java
quarkus.io
December 24, 2025 at 11:07 AM
🎄 Merry Christmas from @quarkusio!
Hibernate with Panache Next is here - unifying blocking & reactive, adding stateless support, type-safe queries with Jakarta Data, and a cleaner repository pattern.
One entity, all modes. Experimental but ready to try!
quarkus.io/blog/hiberna...
#Quarkus #Java
Hibernate with Panache Next is here - unifying blocking & reactive, adding stateless support, type-safe queries with Jakarta Data, and a cleaner repository pattern.
One entity, all modes. Experimental but ready to try!
quarkus.io/blog/hiberna...
#Quarkus #Java