Foojay.io | Friends of OpenJDK and Java Programming

Let's wrap up this year with more interviews from the JFall conference. In this episode you'll learn more about Foojay, JVM internals and writing your own programming language, Project Loom and structured concurrency, learning at conferences, code reviews, creating desktop applications with Java, infrastructure as code, JUG Noord, and much more!

Guests

   Geertjan Wielenga
      https://www.linkedin.com/in/geertjanwielenga/
   Nataliia Dziubenko
      https://www.linkedin.com/in/nataliia-dziubenko-341919b8/
   Hanno Embregts
      https://www.linkedin.com/in/hannotify/
   Hinse ter Schuur
      https://www.linkedin.com/in/hinseterschuur/
   Anthony Goubard
      https://www.linkedin.com/in/anthonygoubard/
   Steffan Norberhuis
      https://www.linkedin.com/in/steffannorberhuis/
   Paulien van Alst
      https://www.linkedin.com/in/paulienvanalst/
   Lutske de Leeuw
      https://www.linkedin.com/in/lutske/
   Johan Hutting

Content

00:00 Introduction of topics and guests

01:09 Geertjan Wielenga: OpenJDK evolutions
01:47 The goal of Foojay, the website for the Friends Of OpenJDK
   https://foojay.io/

03:49 Nataliia Dziubenko: What you can learn at conferences
04:48 Writing your own programming language on top of JVM
07:30 What it learned her about the Java compiler
08:38 How it influenced her career as a Java developer

11:20 Hanno Embregts: Project Loom, structured concurrency and scoped values
14:04 Playing music during conference talks
15:09 Important OpenJDK evolutions

17:07 Hinse ter Schuur: Learning at conferences
17:58 Best practices for code reviews

20:03 Anthony Goubard: Creating desktop apps with Java
   https://www.japplis.com

22:45 Steffan Norberhuis: Infrastructure code for AWS
   https://www.rocketleap.dev/
23:50 Java as a Cloud language
24:54 How developers look at infrastructure
26:03 Is getting locked into a single cloud vendor a risk?

28:03 Paulien van Alst, Lutske de Leeuw en Johan Hutting: Introducing JUG Noord
   https://www.meetup.com/jug-noord
29:20 Introducing VoxxedDays Amsterdam
   https://amsterdam.voxxeddays.com/ 
29:40 NLJUG versus local JUGs
30:06 Starting as a new speaker at JUGs
30:24 How to contribute to opensource
31:24 How to speak at JUG Noord
31:53 Learned at JFall

32:38 Outro

Last month, I published a Foojay blog post about the risks in systems that are stuck on old or outdated Java versions and got a lot of feedback from developers. Most of them want to move on but get stuck on management decisions, outdated production environments, or one of the many other reasons that keep systems stuck on old Java versions and dependencies...

Do you want to bring your system from Java 8 to 23? Did you know that Java 17 already got 13 security releases? And that you can use tools like OpenRewrite to help you update your code?

Related Foojay articles

   Why Java 8 is a Ticking Time Bomb Hiding Within Your Organization
      https://foojay.io/today/why-java-8-is-a-ticking-time-bomb-hiding-within-your-organization/
   How Organizations Became Stuck on Outdated Java Versions
      https://foojay.io/today/how-organizations-became-stuck-on-outdated-java-versions/

Guests

   Gerrit Grunwald
      https://www.linkedin.com/in/gerritgrunwald/  
   Jonathan Schneider
      https://www.linkedin.com/in/jonkschneider/
   Martijn Dashorst
      https://www.linkedin.com/in/dashorst/
   Carl Wanting
      https://www.linkedin.com/in/carl-wanting-638943/
   Charl Fasching
      https://www.linkedin.com/in/charl-fasching-77843288/
   Johan Janssen
      https://www.linkedin.com/in/johanjanssen2001/

Content

00:00 Introduction of the topic and guests

01:35 Gerrit Grunwald about CVE fixes in Java updates
04:58 LTS (Long Term Support) versus STS (Short Term Support)

9:45 Jonathan Schneider about the goal of OpenRewrite
12:15 Upgrade all at once, or step by step?
14:03 Who creates the recipes?
15:08 What Moderne is offering on top of OpenRewrite  
17:29 How to use OpenRewrite in your IDE
18:32 Companies maintaining recipies for their products
20:05 Jonathan's view on the importance of upgrades  
26:56 Other use cases for OpenRewrite

29:03 Martijn Dashorst: Updating legacy projects   

33:12 Carl Wanting and Charl Fasching: Migrating projects

39:43 Johan Janssen: Java evolutions and upgrading  

42:51 Outro

AI, LLMs, ChatGPT—these are just a few of the buzzwords of the massive revolution unfolding right now. These tools are reshaping how we work, but they come with a catch: while they help us work faster and smarter, we need to be careful about placing too much trust in them.

I’ve spoken with several guests at the JFall conference in the Netherlands actively working with these tools to learn more about them. And I had a chat with Grace Jansen about a recent Foojay blog post

Guests

Grace Jansen
https://www.linkedin.com/in/grace-jansen/

Sean Li
https://www.linkedin.com/in/sean-li-568a8414/

John Sterken
https://www.linkedin.com/in/jsterken/

David Vlijmincx
https://www.linkedin.com/in/david-vlijmincx/

Urs Peter
https://www.linkedin.com/in/urs-peter-70a2882/

Joost Kaan
https://www.linkedin.com/in/joost-kaan/

Links

https://foojay.io/today/run-ai-enabled-jakarta-ee-and-microprofile-applications-with-langchain4j-and-open-liberty/ 

https://marketplace.visualstudio.com/items?itemName=IBM.wca-eja

https://docs.langchain4j.dev/integrations/language-models/ 

https://foojay.io/today/building-project-panamas-jextract-tool-by-yourself/

https://foojay.io/today/project-panama-for-newbies-part-1/

https://foojay.io/today/writing-c-code-in-java/

Content

00:00 Introduction of topics and guests

01:07 Introduction of Grace and the Foojay blog post  
02:31 What is Langchain4J?  
03:23 What is JakartaEE?  
04:25 What is MicroProfile?  
06:33 Compare these tools with Spring  
08:30 About the demo application of the blog post  
11:32 What is an LLM, and what can it do?  
13:41 Short-term evolutions in AI  
16:49 Long-term predictions...  
18:36 IBM Watson code assistant for VSC

19:45 Sean Li: Java at Microsoft
21:56 AI products provided by Microsoft
25:09 Code upgrades with a VSC extension

26:44 John Sterken: AI as a coding assistant

30:50 David Vlijmincx: Project Panama in relation to AI  

34:53 Urs Peter: Generative AI, LLMs, and LangChain4J

40:20 Joost Kaan: Organizing an AI conference

Foojay Podcast published in November 2024  
All info, show notes, and links: https://foojay.io/today/category/podcast/ 

At Devoxx and JFall, we talked with Georgios Diamantopoulos, Lutske de Leeuw, Tom Cools, Jessica Siewert, and Rijo Sam about staying physically and mentally healthy as software developers. There are many topics to handle, like the impact of AI on how valuable we feel, how COVID-19 impacted careers, how we work in and with remote teams, how to get to know new colleagues and much more. Yes, there is even a sidestep where we compared the Java and .NET communities.

Guests

   Georgios Diamantopoulos
      https://www.linkedin.com/in/georgiosd/ 
      https://x.com/georgiosd  
   Tom Cools
      https://www.linkedin.com/in/tom-cools-17547548/  
      https://bsky.app/profile/tcoolsit.bsky.social  
   Lutske de Leeuw
      https://www.linkedin.com/in/lutske/ 
   Jessica Siewert
      https://www.linkedin.com/in/jesiewert/  
   Rijo Sam
      https://www.linkedin.com/in/rijosam19/ 
      https://github.com/Rijosam  

Content

00:00 Introduction of topic and guests

00:48 Georgios Diamantopoulos about the impact of your work on your body
05:22 Comparing Java to .NET community

06:54 Lutske de Leeuw about the impact of AI on our job
09:13 Impact of Covid and working from home
10:48 Talk with your colleagues about mental issues

12:06 Tom Cools about switching jobs
13:00 About the danger of a burnout, dealing with stress, and trying too much at the same time
17:08 How to deal with Impostor Syndrom

20:31 Jessica Siewert about dealing with conflicts within a team
22:50 How to get in contact with new people

24:58 Rijo Sam about working in and with remote teams
26:34 Schedule "coffee moments"!
30:54 Impact of time zone differences
33:02 Misunderstanding each other because of cultural differences
34:44 The danger of text chat versus having a voice chat
37:04 Avoid team burnout!

37:43 Conclusion

Belgium might be tiny, but we have a strong Java Community! As I was doing interviews at Devoxx in October, I met several of these people, and we talked about their projects, how you can get involved in OpenJDK, and maybe even start a company out of it. This podcast will teach you more about Devoxx, VoxxedDays, Devoxx4Kids, JobRunr, Timefold, OpenJDK Mobile, OpenJFX, Thymelead, htmx, and more!

Guests
   Stephan Janssen
      https://www.linkedin.com/in/stephanjanssen/  
      https://x.com/Stephan007
      https://www.devoxx.com
      https://events.voxxeddays.com
      https://www.devoxx4kids.org/
   Ronald Dehuysser
      https://www.linkedin.com/in/ronalddehuysser/
      https://x.com/rdehuyss
      https://www.jobrunr.io/en/
   Geoffrey De Smet
      https://www.linkedin.com/in/ge0ffrey/
      https://x.com/GeoffreyDeSmet
      https://timefold.ai/
   Johan Vos
      https://www.linkedin.com/in/johanvos/
      https://mastodon.social/@johanvos
      https://x.com/johanvos
      https://gluonhq.com/
      https://github.com/openjdk/mobile
      https://github.com/openjdk/jfx/
   Wim Deblauwe
      https://www.linkedin.com/in/wimdeblauwe/
      https://x.com/wimdeblauwe
      https://www.wimdeblauwe.com/books/modern-frontends-with-htmx/
      https://www.wimdeblauwe.com/books/taming-thymeleaf/
      https://www.wimdeblauwe.com/projects/

Content

00:00 Introduction

00:47 Stephan Janssen about how Devoxx started
02:22 Difference between Devoxx and VoxxedDays
03:47 About Devoxx4Kids
04:22 Sponsors are needed to keep the entrance fee low
06:26 About the speakers and CFPs
07:11 Important Belgian Java people and tools

09:08 Ronald Dehuysser about JobRunr
10:00 How to turn an open-source project into a company
11:09 Reviewing and validating the evolutions in Java
12:35 Importance of conferences
13:23 How government support can help a startup
14:02 Challenge of starting a company...

14:40 Geoffrey De Smet about Timefold and the challenges in scheduling
16:47 How AI helps to find the best schedule
18:34 How it started as an open-source project (Optoplanner)
19:06 The challenges of growing Timefold as a company
21:26 Visiting conferences as a "yearly training"

22:36 Johan Vos about OpenJFX and how he got involved
24:49 Everyone can contribute to OpenJDK and OpenJFX
25:50 The goal of the OpenJDK Mobile project
29:33 About the Belgian Java community

30:29 Wim Deblauwe about Spring libraries and books
30:50 About Wim's Thymeleaf and htmx books
32:08 How to get involved in the Java community
33:06 Goal of writing a book
33:40 Wim's involvement in the community

35:08 Outro

What do people who have Developer Relations as their job description do? And how do you become a conference speaker? You'll learn in this Foojay podcast!

At Devoxx in Belgium, I got to talk to Josh Long, Baruch, Pratik Patel, and Roni Dover, who are on the stage because it's part of their job. They share many tips about being a DevRel and the plenty tasks involved in such a job. I also talked with Clo Willaerts who was my inspiration many years ago to become a speaker myself, when I saw her presentation at a marketing conference.

Clo Willaerts

• https://www.linkedin.com/in/clowillaerts/ 
• https://x.com/bnox 
• https://clowillaerts.com/ 
• https://clowillaerts.substack.com/  
  
  Josh Long
• https://x.com/starbuxman
• https://www.linkedin.com/in/joshlong/  
  
  Baruch Sadogursky
• https://www.linkedin.com/in/jbaruch/ 
• https://x.com/jbaruch  
  
  Pratik Patel
• https://www.linkedin.com/in/prpatel/ 
• https://x.com/prpatel 
  
  Roni Dover
• https://www.linkedin.com/in/ronidover/ 
• https://x.com/doppleware  
  

00:57 Clo about the difference between marketing and technical conferences
02:49 Impact of ecological cost on our work
04:56 Fast changes in trending topics  
07:33 How to get paid as a (keynote) speaker
12:53 Josh about being Developer Relation
14:53 How to reach the energy level of Josh
15:42 Do you have to be an expert about a topic to talk about it?
18:34 How to create a story for a new talk
19:02 Only use slides when really needed
22:29 How hard is live coding?
23:48 Baruch about the DevRel role
24:52 How to move from Dev to DevRel
25:44 The focus of Baruch
27:57 Pratik about the role of a dev team at a conference
29:50 How DevRel influences product development in their company
31:36 How Pratik became a DevRel
32:40 Good and bad of being a DevRel
34:38 Roni about the role of a DevRel
35:54 Importance of using your product (coding) as a DevRel
37:35 Back side of the job  
38:43 Tip 1: Ask to be a speaker  
39:31 Tip 2: Stand out!
41:01 Tip 3: The show must go on!
42:31 More tips...  
48:08 One final tip from Josh
48:16 Outro
Book by Geertjan Wielenga: "Developer, Advocate!"

Three years after Log4Shell caused a significant security issue, we still struggle with insecure dependencies and injection problems. In this podcast, we'll discuss how developers can secure their code. I talked with three authors who posted a security and code quality post on Foojay.io.

Guests

    Jonathan Vila  
        https://www.linkedin.com/in/jonathanvila/ 
        https://about.me/jonathan.vila 
        https://twitter.com/jonathan_vila 

    Brian Vermeer
        https://www.linkedin.com/in/brianvermeer/ 
        https://brianvermeer.nl/ 
        https://twitter.com/BrianVerm 

    Erik Costlow  
        https://www.linkedin.com/in/costlow/  
        https://twitter.com/costlow  

Content

00:00 Introduction of topic and guests

01:35 Brian: Why is Log4Shell still around?
   https://foojay.io/today/the-persistent-threat-why-major-vulnerabilities-like-log4shell-and-spring4shell-remain-significant/  
03:24 Outdated dependencies are still used a lot
04:31 Who is responsible for dependency updates?
07:55 Snyk tools to help discover issues
10:15 Comparing to Dependabot
11:21 How to keep dependencies up-to-date
14:32 Responsibility to use dependencies with care
17:17 Looking forward to the JFall conference  
18:48 About Foojay  

19:49 Jonathan: Is SQL injection still a problem?
   https://foojay.io/today/top-security-flaws-hiding-in-your-code-right-now-and-how-to-fix-them/ 
24:50 Deserialization injection
27:30 Logging injection
31:22 Even experienced developers make mistakes
33:17 About Sonar tools
35:53 Other articles by Jonathan
   https://foojay.io/today/author/jonathan-vila/ 
   https://foojay.io/today/ensuring-the-right-usage-of-java-21-new-features/
38:20 Other security tools
   https://www.youtube.com/watch?v=-wVCYj8oQUY

39:47 Erik: Trash Pandas are attracted by unused code
   https://foojay.io/today/trash-pandas-love-enterprise-java-garbage-code/  
43:01 How bad are insecure but unused libraries?
45:16 Problem of code only used by unit tests
47:15 Testing in different layers (develop, test, production)
49:31 How much code is not used in production?
50:31 How code becomes unused
   https://foojay.io/today/foojay-podcast-57/

54:29 Conclusions

OpenJDK (Java) 23 is here! This version introduces three new features to the language and runtime, many bug fixes, small improvements, and a longer list of preview features. What are the most important facts about this release? Let's find out...

• https://www.linkedin.com/in/siritter/
• https://mastodon.social/@speakjava
• https://twitter.com/speakjava  
  

• https://www.linkedin.com/in/arturskowronski/
• https://x.com/ArturSkowronski

https://webtechie.be/tags/jfx-in-action/  

1:06:18 Conclusions

In this Foojay podcast, we enter the world of mathematics by discussing Vectors and how they are crucial for AI and machine learning. As ChatGPT explains: "A Vector is a mathematical structure that holds numerical values. Vectors are fundamental to the field of Artificial Intelligence, as they allow mathematical operations to be performed efficiently and form the basis of many machine learning algorithms." OK, but how are these vectors crucial for the whole Artificial Intelligence evolution?

This is the last podcast of season 3, we're taking a summer break and will be back in September with the release of Java 23 and much more OpenJDK-related topics!

• https://www.linkedin.com/in/jbellis/
• https://x.com/spyced
  

• https://www.linkedin.com/in/alexander-chatzizacharias/
• https://x.com/alex90_ch  
  

00:00 Introduction of the topic and guests
01:57 What is a Vector?
   https://github.com/openai/tiktoken
   https://arxiv.org/abs/1301.3781
   https://towardsdatascience.com/word2vec-research-paper-explained-205cb7eecc30
   https://github.com/jbellis/jvector 
07:14 Vectors explained as a game
   A fun and absurd introduction to Vector Databases: https://www.youtube.com/watch?v=mQGf9hWTqSw
09:44 Understanding tokenizers
10:40 Do we need dedicated Vector databases?
13:39 Vectors, LLMs and hallucinations
   Crafting your own RAG system: Leveraging 30+ LLMs for enhanced performance by Stephan Janssen: https://www.youtube.com/watch?v=9PX5l4ETn0g
20:40 How LLM and chat interfaces are used in companies
   https://www.bbc.com/travel/article/20240222-air-canada-chatbot-misinformation-what-travellers-should-know
23:45 Indexing all of Wikipedia
   https://foojay.io/today/indexing-all-of-wikipedia-on-a-laptop/
   Demo application: https://jvectordemo.com:8443/
   https://openjdk.org/projects/panama/
27:23 Evolutions in Java for vectors, LLMs, and AI
   Vector API (Eighth Incubator): https://openjdk.org/jeps/469
   Foreign Function & Memory API: https://openjdk.org/jeps/454
32:44 Is the GPU needed for vector use cases?
35:04 Can we already use the incubator Vector API in production?
38:27 Some predictions...
   Colbert project: https://github.com/stanford-futuredata/ColBERT
   https://thenewstack.io/overcoming-the-limits-of-rag-with-colbert/
44:19 Make your vectors smaller to make them more efficient and less expensive
   https://www.sciencedirect.com/topics/engineering/vector-quantization
   https://huggingface.co/blog/embedding-quantization
   https://foojay.io/today/visualizing-brain-computer-interface-data-using-javafx/
   Asteroids 3D in JavaFX made from AI Deep Fake Audio data: https://www.youtube.com/watch?v=vFThM9BoTLg
49:19 Outro

As a backend developer, you may not realize that Java was initially born on embedded devices like set-top boxes and gateways. We discussed this topic for the first time almost three years ago in Foojay Podcast #2 with James Gosling, Johan Vos, Erik Costlow, and Frank Delporte (https://foojay.io/today/foojay-podcast-2/).

In this episode #55, we look into the history of the Java Micro Edition and how things evolved. Nowadays, with processors becoming increasingly powerful, we can run the exact same Java runtime on any Linux system, from the biggest cloud servers to the smallest Raspberry Pi Zero. Let's find out what can be done with Java in the embedded world.

Robert von Burg

• https://www.linkedin.com/in/eitchme/
• https://mstdn.gsi.li/@eitch

DaShaun Carter

• https://www.linkedin.com/in/dashaun/
• https://twitter.com/dashaun
• https://vmst.io/@dashaun

Pavel Petroshenko

• https://www.linkedin.com/in/pavel-petroshenko-5220092/

00:00 Introduction of the topic and guests
04:53 Java is running on more devices than we can imagine
06:18 History of Java ME
https://www.oracle.com/java/technologies/javameoverview.html
https://en.wikipedia.org/wiki/SavaJe
Jasper S20: https://vimeo.com/198239375
Jasper S20: https://www.phonescoop.com/articles/article.php?a=77&p=1498
15:55 Java on modern embedded devices
22:25 Are modern embedded devices still "embedded"?
25:24 Current modern Java is perfect for embedded uses
https://www.pi4j.com
30:10 How Java moved to ARM on Mac and cloud
34:48 Green Computing = Reducing costs
Presentation by Miro Wengner: https://www.youtube.com/watch?v=zP4xeeY3HIA
https://thenewstack.io/which-programming-languages-use-the-least-electricity/
37:47 Recent Java evolutions impacting embedded use
41:51 Is there a need for real-time Java?
LED strips with Java: https://www.pi4j.com/examples/jbang/pixelblaze_output_expander/
49:44 Spring IO presentation by DaShaun
https://2024.springio.net/sessions/spring-boot-on-the-edge
51:38 Java on RISC-V
https://riscv.org/blog/2024/04/java-21-and-22-now-available-on-risc-v-a-collaboration-between-rise-and-eclipse-adoptium
53:27 More details about the product Robert develops with Java
https://www.pi4j.com/featured-projects/soft-real-time-plc-written-in-strolch/
https://strolch.li/
59:09 Network alternatives on embedded (e.g. LoRa)
1:03:42 What will the future bring to embedded Java?
Pi4J Spring Boot: https://www.youtube.com/watch?v=I62IviQLNts
https://openjdk.org/projects/leyden/
https://openjdk.org/projects/crac/
1:09:07 Conclusion