Marcus Hellberg
@marcushellberg
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International speaker on Web, Java, and DevRel. Expect: food, nature, adventure, random observations. VP of Developer Relations @vaadin
California, USA
Joined November 2008
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Pinned Tweet
Did you know you can build a full-stack web app in Java using Spring Initializr? Here's how in 45 seconds ⚡️
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What if Java developers could build web apps without touching JavaScript? 🤔
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An AI chatbot + web UI in under 20 lines of Java using Spring AI & Vaadin 🤖
And as a GraalVM native image, it starts in 0.1 seconds! ⚡
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177
I had the pleasure of meeting James Gosling at the JCP 25 year anniversary party yesterday. It was a surreal feeling to shake hands and exchange words with the lead designer of
#Java
, the language that I’ve build my career on.
4
9
144
Did a performance comparison between
@angular
and
@polymer
- turns out
#WebComponents
are really fast!
8
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123
I created a new app starter that lets you build a custom chat with docs (RAG) app in 4 simple steps.
☕ 100%
#Java
🤖
@OpenAI
or
@ollama
for a local LLM
🦌 🦜
@vaadin
and
@langchain4j
Step 1: clone
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I love how simple Java makes building apps.
Want to call AI? Use Java.
Want a web UI? Use Java.
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What's your favorite programming language, and why is it Java?
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Wow. My Java AI library playground app has gained over 80 GH stars in just a few weeks 🤩
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The first video in my AI in Java series is out: using LangChain4j and Spring Boot to build a ChatGPT clone 👇
2
9
89
I analyzed talks at 4 large
#Java
conferences to understand what's trending in the Java ecosystem 📈
Read my full analysis here:
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83
I'm excited to announce: we're hosting a live stream on design systems, web components, and a11y next week!
We have an amazing lineup of experts joining: Ari Gilmore,
@WestbrookJ
,
@daKmoR
and
@stoyanova_elly
- hosted by
@RolfSmeds
.
Mark your calendars!🗓️
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I got a lot of requests for my list of
#Java
events, so I made this: ☕️
The source is on GitHub to make it easy for anyone in the community to add and update events.
5
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The most advanced
@polymer
data table,
#Vaadin
Grid 2.0-beta1 is released! 🎉
Demos & docs ➡
#webcomponents
#polymer
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Excited to see
@vaadin
listed on
@buildWithLit
's list of forward-looking organizations on 🙌
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12
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Had a great time at the JCP 25 year party tonight. Java has such an amazing community ❤️
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26 lines for a Spring AI chatbot, rendering markdown, and streaming answers over a WebSocket.
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9
58
Finland claims to be the happiest country in the world, yet there are no Java conferences there? Suspicious.
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2020 is going to be exciting! We're adding support for TypeScript + LitElement based views in Vaadin 15:
↔️ type-safe, async & stateless access to Java backend
⚛️reactive templates
✅non-breaking for existing projects
...and much more in the pipeline👉
2
22
54
The new
#Vaadin
Elements site is out! A new look, more components, and more docs!
#polymer
#webcomponents
4
22
55
Sync: programmer 🙂 hardware 😢
Async: programmer 😢 hardware 🙂
Loom: programmer 🙂 hardware 🙂
0
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52
#Vaadin
Router RC is out ⚡️
✔️ Built for
#webcomponents
, framework agnostic
✔️ < 7KB
✔️ Express-style routes with params
✔️ Redirects
✔️ Callbacks before/after nav
✔️ Code splitting and lazy child routes
✔️ Animations
✔️ Apache 2.0
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It's easy to take the maturity of the Java ecosystem for granted. Whenever I do Python development, I grow increasingly thankful for tools like Maven.
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Hello, Java 21! I love how easy installing and managing JDKs has become.
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7
51
Thanks
@starbuxman
for being a
@vaadin
champion! Hope you enjoy the special edition all-black Vaadin x Peak Design backpack!
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My Java AI library comparison app now has both LangChain4j and Spring AI support. Huge thanks to
@christzolov
for contributing to the project and fixing issues in Spring AI. Open source is awesome!
Try it out:
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RestTemplate, WebClient, Feign. So many options for calling REST services in a Spring Boot app.
Which do you prefer, and why?
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What makes
@buildWithLit
so fast?
@leifastrand
takes a deep dive into the internals of Lit in this video.
(Spoiler: it makes the browser do most of the work)
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11
50
I'm excited to announce that
@LawrenceDCodes
has joined the
@vaadin
DevRel team as a Developer Advocate. You can expect some great
@hillaframework
and Vaadin Flow content going forward!
Please help me welcome Lawrence to the Vaadin community!
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Did you know Vaadin supports GraalVM native image builds out of the box?
Compile your app with
mvn -Pnative-Pproduction native:compile
Then run the native binary in the target dir and ⚡️🤯
0
10
48
I love how easy
@intellijidea
makes finding Maven dependencies. Type something close to what you need and it'll usually figure it out.
1
7
46
Several people have asked me how
@vaadin
compares to
@htmx_org
. On the surface, both allow Java developers to create web apps, after all.
The difference is in the type of apps they're meant for.
@jlazaroff
recently wrote a post about why he thinks the website vs. web app
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DevRel is a long game.
Marketing finds leads. DevRel makes sure there are leads to find in the years ahead.
A thriving developer community is the foundation of sustainable growth.
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13
47
Exciting news! My Java AI example app now has support for Semantic Kernel in addition to Spring AI and LangChain4j! Huge thanks to
@iamsoham
for contributing 👏 🥳
Source:
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10
47
Wow, my presentation was voted the 3rd best talk at
@Jfokus
🥹
Thanks to everyone who attended the talk and the Jfokus team for arranging such an amazing conference!
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1
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Couldn't resist trying out the experimental
#React
#WebComponent
support 🤩
Built a demo app with a Spring Boot-based Fusion app, a React frontend, using Vaadin components. Nice.
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45
Hill(a) yeah!
@hillaframework
is now available on ! 🎉
After downloading, initialize the frontend folder with:
mvnw hilla:init-app or
gradlew hillaInitApp
Then run the Spring Boot app as normal.
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10
46
Hey there,
#Java
developers and
#SpringBoot
aficionados. The complete 16-part tutorial series on building a full-stack
#Vaadin
web app from zero to deployment is now available:
💻Online
📼On YouTube
📖As a downloadable PDF ebook
0
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My Vaadin Fusion tutorial is out! 14 chapters covering:
🔥 LitElement & TS views + components
🦌 Vaadin components, router, binder
🕸️MobX state management
📶Offline PWA
🍃Java Spring Boot, Data & Security + H2/PostgreSQL
🌏Heroku deployment
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@mariofusco
The features are aimed at different audiences.
Unnamed classes and instance main methods are there to make it easier for new developers to get started, to help keep the Java community vibrant also in the years to come.
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At
@vaadin
, we like simple things.
Vaadin is designed for building business apps. That helps us optimize things.
Initial render is important. But being productive at work all day is more important.
Maintainability is key, trends less so.
Five years ago, a simple 'Hello World' in React was straightforward. Now, it feels like understanding the universe's creation story is easier than grasping React's server-first approach.
What happened?
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1K
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Comparing the same blog in
@gatsbyjs
and
@wordpressdotcom
.
By making my life as a content creator easier, I've made the experience of my visitors significantly worse 😥
#WordPress
#Gatsby
#webperf
#perfmatters
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.
@fractorious
, following up on our discussion about the Native File System API at
#ChromeDevSummit
. We wrote a blog post on what we learned from experimenting with the origin trial, especially about the UX of permission popups:
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40
Time to take the new Oracle VS Code plugin for a spin.
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The
@vaadin
booth at
@jcon_conference
is open for business! Come grab a special JCON24 edition t-shirt while they last!
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As of today, I’m officially a Nevada resident after 12 years in California. Now I get to enjoy looking at California on the other side of the lake.
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In
@vaadin
24.4, adding a Java view to a Hilla project is as simple as creating the view. Adding a Menu-annotation automagically adds it to the menu.
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5
39
Now that
@vaadin
14 supports ES modules and
#webpack
, you can do some pretty cool stuff. Like build extensions and views in
#TypeScript
using
#WebComponent
libraries like
#LitElement
. So many new possibilities🤩
Example project if you want to try it out:
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Thanks for joining my Java + AI session at
#JCON2024
! Here’s the source for the demo app we built
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40
My Java AI assistant demo now has Spring AI and LangChain4j in separate branches to make it easier to add support for additional LLMs as well.
Do I know anyone from the Semantic Kernel team that wants to help me add a SK branch?
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7
40
Blink and you'll miss it. Starting a
@hillaframework
+
@springboot
3 app that has been AOT compiled on
@graalvm
⚡
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39
#Vaadin
Router 1.0 is out🍾🎉
✔️ Built for
#webcomponents
✔️ < 7KB
✔️ Express-style routes w/ params
✔️ Redirects
✔️ Callbacks before/after nav
✔️ Code splitting support
✔️ Animations
✔️ Apache 2.0
⚡️
#polymer
#lithtml
#stenciljs
#vaadin
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Workplace apps shouldn't suck.
But we all have that one app at work...
🧵 A thread about why we built Vaadin 🧵
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I like Canada. I like Java. So what's a better way to spend a week than speaking at 4 JUGs and visit 4 fun cities: Quebec City, Montreal, Ottawa, and Toronto.
Should be fun, eh?
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An AI chatbot + web UI in under 20 lines of Java using Spring AI & Vaadin 🤖
And as a GraalVM native image, it starts in 0.1 seconds! ⚡
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177
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3
35
New Java AI app starter of the week: sentiment analysis and response generation for customer feedback. Built with
@vaadin
Hilla and
@langchain4j
What AI use case would you like to see me cover next?
Code:
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Java AI libraries are evolving at a breathtaking pace ⚡️
It's great, but also means lots of updates to my talk on LangChain4j, Spring AI, and Semantic Kernel tomorrow 😅
2
2
35
A whole bunch of new
#Vaadin
Elements up on our website: dropdown-menu, item, list-box, notification, horizontal/vertical layout, tabs
#webcomponents
#polymer
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🤯 over 130 signups for my Java AI library talk today. Good thing it's online so everyone can find a seat.
Join us at 19:30 CET to learn about Spring AI,
@langchain4j
, and Semantic Kernel.
Sign up here:
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35
Great news everybody! You can now add
@vaadin
as a dependency to your new
@QuarkusIO
project on
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33
One of the most rewarding times of being a devrel for
@vaadin
is seeing a backend Java developer discover they have the skills to build a web app on their own.
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32
Creating a new
@hillaframework
app with
@intellijidea
is now super simple:
1. Create a new project using Spring Initializr
2. Add Hilla, DevTools, and any other deps
3. Run the hilla:init-app Maven goal
4. Run the Spring Boot app normally
5. ✨
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Here's how I deploy my Hilla app as a GraalVM native image automatically any time I push to GitHub:
1. Dockerfile
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7
33
Working together with
@alina_yurenko
on something fun for
@spring_io
👀
(hint: featuring
@vaadin
&
@graalvm
)
2
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32
You know you're no longer working in a small startup when you get excitedly surprised by features announced in your own blog. Case in point: vaadin-dialog is now user resizable 🤏
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31
My global upgrade certificate came through last minute 🤩
Thank you
@devnexus
! Next up: Finland 🇫🇮
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33
If you're at
@devnexus
and like to learn hands-on, come to my presentation on Wednesday after the keynote. We'll:
🌱 ⚛️ Build a full-stack reactive Spring Boot + React web app with
@hillaframework
💬 Integrate ChatGPT
⚡ Build a native GraalVM image
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