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Codetown is a software developer's community. It's a technical networking and educational group focused on software development.
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Issue 326 - Stream Gathering with a Different Distinct Function
A few years ago, we tried to create a new distinct() function for a Stream. It wasn't pretty. In this newsletter we revisit that adventure using the new Stream Gatherers from Java 24.Issue 325 - Be a Distinguished Java Engineer in the Age of Vibe Coding
We are all amazed how AI can help us in everyday tasks. It can even write Java code. But "Show me the Pull Requests" (Evans) sums it up nicely. We do not (yet) see AI massively improving open source projects.Issue 324 - Sequenced LinkedHashSet
LinkedHashSet implements the SequencedCollection interface, allowing us to addLast(), addFirst() and even reverse the collection. This sometimes causes some surprises.Issue 323 - Visiting All Threads (Including Virtual)
In this newsletter, we explore how we can visit the entire hierarchy of threads in our virtual machine, including virtual threads. We do this using the composite, visitor and facade design patterns.Issue 322 - Throwing InterruptedException Early
The LinkedBlockingQueue and LinkedBlockingDeque behave slightly differently when methods put() and take() are called by a thread that happens to be in the "interrupted" state. The LBQ throws an InterruptedException immediately when we call take(), even if the queue contains elements. The LBD, however, only throws InterruptedException if the deque is empty and the thread would enter the WAITING state. In this newsletter we show how a dynamic proxy can make the behaviour consistent.Birthdays
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Events
Blog Posts
Free Eclipse book, recently published
Posted by Michael Levin on August 24, 2025 at 11:59am 0 Comments 0 Likes
ContinueHi Everyone,My publisher is running a free Amazon Kindle book promotion through Monday, August 25th, 2025. The book, “Eclipse Collections Categorically: Level up your programming game” can be obtained for $0 on Kindle on Amazon through the August 25th.…
What is vibe coding?
Posted by Michael Levin on June 9, 2025 at 9:37am 0 Comments 0 Likes
Vibe coding isn’t a formal technical term, but it’s become a slang or colloquial expression among programmers and tech communities—especially on social media and in creative coding circles.
What “vibe coding” usually means:
- Coding based on intuition or feel
Instead of rigidly planning everything out, you’re:- Freestyling as you…
You can now download the source code that sparked the AI boom
Posted by Michael Levin on March 25, 2025 at 4:30am 0 Comments 0 Likes
Learning about artificial intelligence? You may find this interesting.
https://arstechnica.com/ai/2025/03/you-can-now-download-the-source-code-that-sparked-the-ai-boom/
50% Keyboard Guide: Tiny Typists' Delight
Posted by Hugh Jack on June 19, 2024 at 10:15am 0 Comments 1 Like
Introduction to Compact Keyboards
Welcome to the world of compact keyboards! These small form factor keyboards are a game-changer when it comes to saving space and typing on the go. Whether you're a student, a professional, or a casual user, compact keyboards offer convenience and portability like never before.
What are Compact Keyboards?
Compact keyboards are smaller versions of traditional keyboards. They come in various…
ContinueNext OJUG and GatorJUG Meetings will be fabulous - Check out the Codetown Events
Watch for details on our upcoming meetings. OrlandoJUG meeting's fall on the 4th Thursday of every month, in case you want to mark your calendars. Stay tuned for details! GatorJUG meets the 2nd Wednesday of every month.
The details are posted in the CodeTown Events section. Please RSVP so we'll know how much pizza to order. Stay tuned! ...Mike
Groups
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Kotlin Town
6 members
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Computational Linguistic…
15 members
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Jobs
75 members
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Contest Town
9 members
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OrlandoJUG Town
96 members
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GatorJUG Town
30 members
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Community Corral
23 members
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Scala
5 members
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Freelance Village
11 members
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iPhone Development
40 members
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Ruby Town
14 members
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Clojure
8 members
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Groovy and Grails
25 members
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Other Languages on the J…
9 members
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Java SE Town
14 members
Forum
Java books for any library 5 Replies
What books should be on the bookshelf of EVERY Java programmer, no matter what specific technologies they are working on?The two that come to my mind areThinking in JavaJava Concurrency in PracticeWhat else am I missing?Continue
Started by David Moskowitz in Java. Last reply by sneha gulati Feb 8, 2019.
Error trying to use Fragment
I am new to Android. I have been working thru some examples in a book called Head First Android Development. I entered a small program using fragments and get a Casting Error.cannot cast andoid.app.fragment to…Continue
Tags: Fragment
Started by Robert Sobol in Java Oct 10, 2017.
Fragment Syntax Problem
My name is Rob Sobol.I have been working through a book called Head First Android Development.I hit a syntax error in a simple exercise that uses one fragment. I have been trying to figure out the error for days. I am hoping some in the forum can…Continue
Tags: Fragments
Started by Robert Sobol in Java Oct 10, 2017.
Hadoop getting old?
An article just came out in InfoWorld about trends, which is always an interesting subject. Funny, they said Hadoop wasn't hot. Spark is. It's a good read. …Continue
Tags: codetown, infoworld, programming, hadoop, trends
Started by Michael Levin in Trends Apr 10, 2017.
What's functional programming, anyway?
Can you believe people are still trying to come up with a good definition or explanation of what functional programming is? Paul Krill is a journalist with InfoWorld. Here's an article he just wrote: …Continue
Tags: functions., codetown, lambdas, clojure, programming
Started by Michael Levin in Functional Programming Feb 21, 2016.
Santafe College 2 Replies
Santafe just added a new BAS bachelor's program of study. 5651 ProgrammingContinue
Started by Dan Lackey in Dynamic Languages. Last reply by Michael Levin Feb 15, 2016.
Using SQL with Node,.js 1 Reply
All the tutorials and books for node.js seem to use Mongo as the database. I am not sold on 'document' databases and would like to know how difficult it is to use any version for plain old tried-and-true SQL with Node.js.Does anybody have any…Continue
Tags: 'document, databases', SQL, node, node.js
Started by Kevin Neelands in Dynamic Languages. Last reply by Lou Caudell Nov 10, 2015.
The advantages of a RESTfull web-based API 5 Replies
I need to get a better handle on the advantages of a RESTful web-based API. People tell me they scale better than other methods, but I don't see how they reduce database access or have any other feature that helps handle large amounts of traffic.…Continue
Tags: API', 'web-based, RESTful
Started by Kevin Neelands in Dynamic Languages. Last reply by Kevin Neelands Oct 25, 2015.
Want a Job? 1 Reply
Hi, Not sure if this is the appropriate place to post this sort of things (forgive me if its not). My company (really nice company btw) is looking to hire two junior and two senior Java Developers. Please forward me your resume to slaassel@gmail.com…Continue
Started by Saad Laassel in Java. Last reply by Theresa Wizorek-MacIntyre Oct 15, 2014.
Storing Sensitive Data ( like SSNs ) 1 Reply
We might have to store Social Security Numbers. We REALLY don't want to do this in our own database, we'd like some external 'vault' service that stores them encrypted and getting to them is difficult. Does anyone have any ideas along these lines?Continue
Started by Kevin Neelands in Java. Last reply by Michael Levin May 7, 2014.
Latest Activity
Free Eclipse book, recently published
Hi Everyone,My publisher is running a free Amazon Kindle book promotion through Monday, August 25th, 2025. The book, “Eclipse Collections Categorically: Level up your programming game” can be obtained for $0 on Kindle on Amazon through the August 25th.https://www.amazon.com/Eclipse-Collections-Categorically-Level-programming-ebook/dp/B0FFM5MHBV/The Kindle…See More
See Y’all soon, I hope!
Hello Juggies! The time has come for someone else to take the reins with this group. It’s been incredibly rewarding for over 20 years and I thank all of you for your contributions. Hopefully I will see many of you at the next meet up.Best regards,MikeSee More
"Hello Juggies!
The time has come for someone else to take the reins with this group. It’s been incredibly rewarding for over 20 years and I thank all of you for your contributions. Hopefully I will see many of you at the next meet up.
Best…"
Don Swanson's Paper on Undiscovered Public Knowledge | INNER COSMOS WITH DAVID EAGLEMAN
🛎 If You're New Subscribe ► https://bit.ly/InnerCosmosPodSubscribeThis clip is from Ep 112: How is computer code like magic? (with Sam Arbesman) | INNER CO...
What We Get Wrong About AI (feat. former Google CEO)
AI is here. Now what?Subscribe to support optimistic tech journalism!Everyone’s talking about artificial intelligence and machine learning. There are lots of...
What is vibe coding?
Vibe coding isn’t a formal technical term, but it’s become a slang or colloquial expression among programmers and tech communities—especially on social media and in creative coding circles.What “vibe coding” usually means:Coding based on intuition or feel Instead of rigidly planning everything out, you’re:Freestyling as you codeTrusting your gutLetting ideas evolve naturallyFollowing the “vibe” of what feels right in the momentFlow state or artistic mindset It’s often associated with being in a…See More
Mark Cuban: Why Lifelong Learning is the Key to Success.
Mark Cuban reveals why being a lifelong learner is essential to success. Building anything great requires relentless learning and hard work — no shortcuts. H...
You can now download the source code that sparked the AI boom
Learning about artificial intelligence? You may find this interesting.https://arstechnica.com/ai/2025/03/you-can-now-download-the-source-code-that-sparked-the-ai-boom/See More
LOCAL Private Telephone System (PBX) with USA number for $1 a month
Thank you to 3CX for sponsoring this video. To try 3CX Pro for free for two months sign up using the following link: https://www.3cx.com/signup/?src=davidb...
Haseeb Qureshi: Doing Good with Your Career
Haseeb Qureshi, notable App Academy graduate, cryptocurrency expert, and philanthropist will be giving a talk on Effective Altruism for App Academy students ...
50% Keyboard Guide: Tiny Typists' Delight
Introduction to Compact KeyboardsWelcome to the world of compact keyboards! These small form factor keyboards are a game-changer when it comes to saving space and typing on the go. Whether you're a student, a professional, or a casual user, compact keyboards offer convenience and portability like never before.What are Compact Keyboards?Compact keyboards are smaller versions of traditional keyboards. They come in various sizes, but the main idea is to provide a keyboard that takes up less space…See More
Happy 10th year, JCertif!
Notes
Welcome to Codetown!
Codetown is a social network. It's got blogs, forums, groups, personal pages and more! You might think of Codetown as a funky camper van with lots of compartments for your stuff and a great multimedia system, too! Best of all, Codetown has room for all of your friends.
When you create a profile for yourself you get a personal page automatically. That's where you can be creative and do your own thing. People who want to get to know you will click on your name or picture and…
ContinueCreated by Michael Levin Dec 18, 2008 at 6:56pm. Last updated by Michael Levin May 4, 2018.
Looking for Jobs or Staff?
Check out the Codetown Jobs group.
InfoQ Reading List
Uber Eats Introduces INCA to Scale Catalog Management from Restaurants to Retail
Uber Eats introduced INCA (Inventory and Catalog), a scalable system to handle vast product catalogs from supermarkets, pharmacies, and retail partners. Unlike the earlier restaurant-focused setup built for low SKUs and simple pass-through data, INCA supports large-scale inventories, rich metadata, and compliance needs essential for retail operations.
By Leela KumiliAirbnb Executes Istio Upgrades at Massive Scale
Airbnb engineering has published a detailed account of how it maintains high availability during Istio upgrades across tens of thousands of pods and thousands of VMs, all without downtime.
By Craig RisiPresentation: Extreme DevOps Automation
Sérgio Amorim shares how Revolut’s small DevOps team leverages a centralized systems catalog and automation to enable 1,300 engineers to build and deploy applications with speed and consistency. He explains how this approach reduces manual effort and improves observability, alerting, and database management at scale.
By Sérgio AmorimAWS Launches Memory-Optimized EC2 R8i and R8i-flex Instances with Custom Intel Xeon 6 Processors
AWS has launched its eighth-generation Amazon EC2 R8i and R8i-flex instances, powered by custom Intel Xeon 6 processors. Designed for memory-intensive workloads, these instances offer up to 15% better price performance and enhanced memory throughput, making them ideal for real-time data processing and AI applications.
By Steef-Jan WiggersArticle: MCP: The Universal Connector for Building Smarter, Modular AI Agents
In this article, authors discuss Model Context Protocol (MCP), an open standard designed to connect AI agents with tools and data they need. They also talk about how MCP empowers agent development, and its adoption in leading open-source frameworks.
By Sanjay Surendranath Girija, Lakshit Arora, Shashank Kapoor
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