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JavaSpecialists

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.

Issue 316 - Code Before super() - JEP 447

Java 22 preview allows us to write code before the call to super(). There are restrictions. We are not allowed to refer to "this" in any way. We thus cannot set fields before calling the superclass constructor. But what if the superclass constructor calls our methods? In this newsletter we explore a workaround using ThreadLocals.


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Blog Posts

50% Keyboard Guide: Tiny Typists' Delight

Posted by Hugh Jack on June 19, 2024 at 10:15am 0 Comments

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…

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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

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…

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How to Download Pinterest Videos

Posted by Maxwell Stone on September 1, 2023 at 11:34am 0 Comments

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…

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Next 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

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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

Haseeb Qureshi, notable App Academy graduate, cryptocurrency expert, and philanthropist will be giving a talk on Effective Altruism for App Academy students ...
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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
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Why AI Needs a “Nutrition Label” | Kasia Chmielinski | TED

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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…
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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

Agile Alliance Joins the Project Management Institute

The Agile Alliance has officially joined the Project Management Institute (PMI), forming the PMI Agile Alliance. The partnership aims to enhance global project management by integrating Agile principles with PMI's resources and reach. While many celebrate the opportunities for collaboration, development and innovation, critics express concerns about the potential dilution of Agile values.

By Shane Hastie

Netflix Enhances Metaflow with New Configuration Capabilities

Netflix has introduced a significant enhancement to its Metaflow machine learning infrastructure: a new Config object that brings powerful configuration management to ML workflows. This addition addresses a common challenge faced by Netflix's teams, which manage thousands of unique Metaflow flows across diverse ML and AI use cases.

By Claudio Masolo

vlt Introduces new JavaScript Package Manager and Serverless Registry

Introducing **vlt**, a groundbreaking open-source JavaScript package manager by former npm team members. Designed as an intuitive drop-in replacement, vlt simplifies dependency management with an innovative query selector and new export formats. Alongside it, **vsr** offers a fair-source serverless registry for enhanced package access control. Embrace the future of JS tooling!

By Dylan Schiemann

Podcast: Intentional Culture and Continuous Compensation: An Interview with Austin Vance

In this podcast Shane Hastie, Lead Editor for Culture & Methods spoke to Austin Vance, about the importance of intentional onboarding and culture-building, as well as his company's unique approach to compensation and the role of managers in retaining top talent.

By Austin Vance

Presentation: High Performance Time- series Database Design with QuestDB

Vlad Ilyushchenko discusses geographical data distribution, simplifying data pipelines with HA writes, data visualization with SQL extensions, providing data scientists with scalable data access.

By Vlad Ilyushchenko

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