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Issue 321 - StampedLock ReadWriteLock Dangers
ReentrantReadWriteLock has a limit of 65536 concurrent read locks. That is an unattainable number with platform threads, but definitely achievable with virtual threads. In this newsletter we explore some of the issues if we want to switch to the StampedLock.asReadWriteLock() instead.Issue 320 - Please Don't Yield A Lot
Java's Thread.yield() traditionally would cause a voluntary context switch. However, with virtual threads, it causes the thread to be unmounted from its carrier thread. This can greatly increase the user and system time for ALL the carrier threads. And there is no way to turn it off. Keep an eye out for yield in your thread dumps.Issue 319 - ArrayBlockingQueue: Weakly Consistent Iteration Powered by Weak References
Like many other concurrent collections, the ArrayBlockingQueue sports a weakly-consistent iterator. However, the ArrayBlockingQueue always has a maximum capacity, the length of the underlying array. In this newsletter we explore what happens to pending iterators when we wrap around the circular array.Issue 318 - Getting Rid of Unused Warnings with _
We sometimes are forced by the Java language to declare variables that we never use, attracting the ire of the javac compiler. Since Java 22 we have a way to declare these as "unnamed" by using an underscore.Issue 317 - Explicit vs Diagnostic GC
How many times have we seen programmers call System.gc() to "help the garbage collector"? Unfortunately far too often, with potentially terrible performance implications. In this newsletter we explore the explicit and the diagnostic GC and how we can force a GC, even if explicit GCs are disabled.Birthdays
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Events
Blog Posts
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…
ContinueSoftware language criteria
Posted by Michael Levin on December 1, 2023 at 3:48am 0 Comments 0 Likes
We have some exciting news to share with you. Otavio will be joining us to discuss the latest version of Camel in an exclusive presentation. Presentation Details: Speaker: Otavio Rodolfo Piske Topic:…
Posted by Michael Levin on September 2, 2023 at 9:21am 0 Comments 0 Likes
We have some exciting news to share with you. Otavio will be joining us to discuss the latest version of Camel in an exclusive presentation.
Presentation Details:
Speaker: Otavio Rodolfo Piske
Topic: Camel 4:What to Expect
Date: 07 September 2023
Time: 19:00 Ist Time
Duration: Approximately 1 hour
Register URL : https://www.eventbrite.com/e/700456483197
Presentation…
ContinueHow to Download Pinterest Videos
Posted by Maxwell Stone on September 1, 2023 at 11:34am 0 Comments 0 Likes
Pinterest has become a treasure trove of inspiration for millions of users around the world. Whether you're looking for recipe ideas, home decor inspiration, fashion tips, or DIY projects, Pinterest has it all. Among the countless pins and images that flood the platform, videos have emerged as an increasingly popular form of content. But what if you want to download Pinterest videos for offline viewing or to share with friends? In this article, we'll explore the world of Pinterest videos and…
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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OrlandoJUG Town
96 members
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Jobs
76 members
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Spring Town
47 members
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iPhone Development
41 members
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Android Town
35 members
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GatorJUG Town
30 members
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JEE Town
28 members
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SunJUG Town
27 members
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Groovy and Grails
25 members
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Startup City
24 members
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Community Corral
23 members
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Web2.0 Town
19 members
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.Net Town
18 members
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Cloud Computing Village
16 members
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Computational Linguistic…
15 members
Forum
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.
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.
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.
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.
Oracle Embedded MOOC w/ Raspberry PI 1 Reply
If your interested in playing with Java on Raspberry PI - another round of the "Oracle Massive Open Online Course: Develop Java Embedded Applications Using a Raspberry Pi" is starting May 19th. You can find more details and…Continue
Tags: RaspberryPi, embedded, java
Started by Chris Schaefer in Java. Last reply by Michael Levin Apr 10, 2014.
Documentation standards or guidelines? 1 Reply
Does anyone care to share their suggestions for documentation?I'm asking because I recently had to change a program I wrote more than five years ago. I'd always thought that I've done a good job of documentation. But going through it was difficult.…Continue
Tags: Problems @ 2:00 AM, Maintenance, Documentation
Started by Miek in Java. Last reply by Adam Davis Apr 11, 2014.
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Haseeb Qureshi: Doing Good with Your Career
50% Keyboard Guide: Tiny Typists' Delight
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I Live Better In Thailand Than I Did In The U.S. - Here's How Much It Costs | Relocated
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.
Created by Michael Levin Dec 18, 2008 at 6:56pm. Last updated by Michael Levin May 4, 2018.
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InfoQ Reading List
OpenAI cancels o3 released and announces roadmap for GPT 4.5, 5
OpenAI is restructuring its AI strategy to focus solely on GPT-5, consolidating capabilities like reasoning, voice synthesis, and deep research into one unified model. This shift aims to simplify product offerings and enhance user experience, with tiered subscription levels for varying intelligence. As competition heats up, the success of GPT-5 will be pivotal for OpenAI’s future.
By Andrew HoblitzellOpenAI Releases Operator, an AI Agent for Web-Based Tasks
OpenAI released a research preview of Operator, an AI agent that can use a web browser to perform tasks on a user's behalf. Operator achieves new state-of-the-art performance on the WebArena and WebVoyager benchmarks.
By Anthony AlfordTraefik v3.3 Release: Enhanced Observability and Documentation
TraefikLabs recently announced the latest release of Traefik Proxy v3.3 (codenamed "saint-nectaire” after a French cheese). This release focuses primarily on two critical areas: observability capabilities and improved documentation structure. These enhancements aim to make the popular open-source reverse proxy even more powerful for platform engineers working in complex cloud-native environments.
By Claudio MasoloPresentation: Small Actions, Big Impact: Catalyzing Change in Groups
Eb Ikonne discusses expanding informal authority within groups and organizations, how small actions at the individual level can liberate team members, and fostering high-performing work environments.
By Eb IkonneDropbox’s Asynchronous Platform Evolution: From Challenges to a Unified Messaging System Model
Dropbox, a file sharing cloud platform recently discussed their Messaging System Model (MSM) that supports diverse use cases and handles over 30 million tasks per minute.
By Aditya Kulkarni
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