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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 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.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.
Latest Activity
Haseeb Qureshi: Doing Good with Your Career
50% Keyboard Guide: Tiny Typists' Delight
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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.
Created by Michael Levin Dec 18, 2008 at 6:56pm. Last updated by Michael Levin May 4, 2018.
Looking for Jobs or Staff?
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InfoQ Reading List
Google Vertex AI Provides RAG Engine for Large Language Model Grounding
Vertex AI RAG Engine is a managed orchestration service aimed to make it easier to connect large language models (LLMs) to external data sources to be more up-to-date, generate more relevant responses, and hallucinate less.
By Sergio De SimoneAWS Adds Container Insights with Enhanced Observability to Elastic Container Service
AWS recently announced the launch of Container Insights with Enhanced Observability for Amazon Elastic Container Service (ECS). This goes on the lines of a similar feature previously introduced for Amazon Elastic Kubernetes Service (EKS). This new capability aims to improve monitoring and troubleshooting for container workloads.
By Aditya KulkarniTerraform Fork OpenTofu Adds Provider Iteration and Exclusions
Version 1.9.0 of OpenTofu - the infrastructure-as-code tool forked a year ago from Hashicorp's Terraform - has been released. This release brings several significant features, including provider iteration capabilities through `for_each`, to enable simplified multi-zone and multi-region deployments.
By Matt SaundersJava News Roundup: JDK 24 in Rampdown Phase Two, Spring Framework, JobRunr, Commonhaus Foundation
This week's Java roundup for January 13th, 2025, features news highlighting: JDK 24 in Rampdown Phase Two; Spring Framework 6.2.2; JobRunr 7.4.0; Micrometer Metrics 1.15.0-M1 and Micrometer Tracing 1.5.0-M1; and Infinispan joins the Commonhaus Foundation.
By Michael RedlichAndroid Studio Ladybug Update Adds Gemini Support, New Debugging Features, and More
In its recent update to Android Studio Ladybug (2024.2.2), Google has added new Gemini Code Transforms to modify, refactor, or create code, debugging and testing tools, and developer experience improvements. Additionally, the IDE adopts the latest IntelliJ 2024.2 platform release.
By Sergio De Simone
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