How AI works, Explained with Mushrooms ! (Easiest Explanation )
How ChatGPT and other AI chatbots actually work, explained with mushrooms: training, weights, tokens, how an answer is built one piece at a time, temperature...
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Issue 338 - Adjusting Number of Carrier Threads Dynamically
Java 24 added the VirtualThreadSchedulerMXBean, which gives us insight into the pool that is executing our virtual threads. We can even change the number of carrier threads at runtime. In this newsletter we discover how this can get us out of a pickle.Issue 337 - Module Imports
Module imports are a new feature in Java 25 and are like a wildcard import for *all* the types in a module. If you hate wildcard imports, you'll despise this even more. But if, like me, you don't really care whether someone uses a wildcard or single-type import, this is for you.Issue 336 - CopyOnWriteArrayList.subList() ConcurrentModificationException
Java's CopyOnWriteArrayList gives us a snapshot iterator for fast reading. However, its subList() is not snapshot, and will break if the list is changed. In this newsletter we look at a way to make a safe subList() copy, using the iterator and an AbstractList.Issue 335 - ZGC Mysteries
In our previous newsletter we posted a puzzle about ArrayList creation in ZGC. Lots of Java programmers sent in their ideas, and we are still looking for the perfect answer. Here are some more thoughts on the idea, whilst we wait for The Z Garbage Collector Book to arrive.Issue 334 - ArrayList vs LinkedList Puzzle
Every schoolboy knows that arrays are faster than linked structures, no matter the language. In this newsletter we present a puzzle where we find LinkedList outperforming ArrayList for ZGC. Let's see who comes up with the most thorough explanation why.Birthdays
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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…
JavaFX and SteelSeries gauges using FXML
Posted by Jim Clarke on June 25, 2012 at 9:30pm 0 Comments 1 Like
Gerrit Grunwald, aka @hansolo_ on twitter, has just ported his Swing based gauges and meters framework known as SteelSeries to JavaFX as part of the JFXtras-lab project. I can't tell you how many times since Java AWT first came out, that I have had to use meters…
ContinueCeylon OJUG & GatorJUG Talk - Please Yo me!
Posted by Michael Levin on June 27, 2014 at 11:15am 4 Comments 0 Likes
Dear Codetown JUGGIES:
We have a chance for a special Ceylon talk on either Mon 10/13, Fri 10/17, Mon 10/20, or Fri 10/24 in Orlando at OrlandoJUG and/or Gainesville at GatorJUG.
As you all know, OJUG meets 4th Th and GatorJUG meets 2nd Wed and these are Mondays and Fridays, so I need your…
ContinueWhat's bit.ly?
Posted by Michael Levin on March 22, 2009 at 12:00pm 0 Comments 0 Likes
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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
"This looks good! https://www.anaconda.com/docs/anaconda-desktop/tutorials/chatbot-tutorial"
Apple Watch paired with iPhone
I recently read an article describing how to pair an Apple Watch with an iPhone. Looks great. You can leave your iPhone someplace and then use your Apple Watch as a phone. I don’t know anything about Apple watches, but they have them at Costco and of course at the Apple Store. What’s the latest, best one to get And Ann what do you know about this idea?…See More
Apple Watch paired with iPhone
I recently read an article describing how to pair an Apple Watch with an iPhone. Looks great. You can leave your iPhone someplace and then use your Apple Watch as a phone. I don’t know anything about Apple watches, but they have them at Costco and of course at the Apple Store. What’s the latest, best one to get And Ann what do you know about this idea?…See More
Why local AI's the way forward, and the best way period
#devwithserdar With hardware prices spiraling, AI vendors ramping up token costs, and models becoming drastically slimmer and more economical, running AI mod...
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.
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InfoQ Reading List
AWS Capacity Largely Sold Out Through 2027, With On Demand Headroom Reserved
Amazon CEO Andy Jassy says AWS’s large committed cloud capacity is largely sold out through 2027, with part of 2028 already allocated, while the company continues to reserve headroom for On Demand, EC2 and Bedrock. Practitioners discussing the remarks report difficulty obtaining On Demand capacity for ordinary EC2 instances, and similar constraints at other providers.
By Steef-Jan WiggersFile Mover Express: AWS Releases Open-Source Tool for S3 File Transfers
AWS has recently released File Mover Express, an open-source application under the Apache 2.0 license for transferring large files between local systems and Amazon S3. Available for macOS, Windows, and Linux, it supports parallel transfers, automatic performance tuning, retries, pause and resume, and file integrity verification.
By Renato LosioCloudflare’s Post-Quantum GeoKey Manager Enters Closed Beta Without Attribute-Based Encryption
Cloudflare has moved a post-quantum rebuild of GeoKey Manager into closed beta, guarding geo-fenced keys with hybrid ML-KEM-768 and X25519 instead of the attribute-based encryption used since 2022. Keys live only in kernel memory on verified regional servers, and any failed check rejects the request, a fail-closed choice practitioners ask could cause a regional outage. GA is planned for Q1 2027.
By Steef-Jan WiggersOpenBSD 8.0 Brings Expanded Hardware Support, Security Enhancements, and Virtualization Improvements
OpenBSD 8.0 is a substantial upgrade bringing broader hardware compatibility, enhanced security, an expanded virtual address space, and support for modern architectures, including Intel Arc A-Series graphics support, ARM64 hibernation, RISC-V improvements, and enhanced virtual machine support.
By Sergio De SimoneSpring News Roundup: First Release Candidates of Boot, Framework, Data, Security, Modulith, AI
There was a flurry of activity during the week of October 19th, 2026, highlighting: first release candidates of: Spring Boot, Spring Framework, Spring Data, Spring Cloud, Spring Security, Spring for GraphQL, Spring Session, Spring Integration, Spring HATEOS, Spring Modulith, Spring REST Docs, Spring AI, Spring Batch, Spring AMQP, Spring for Apache Kafka, Spring LDAP and Spring Web Services.
By Michael Redlich
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