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Issue 328 - Negative size() in LinkedBlockingDeque

The LinkedBlockingDeque has an interesting feature in addAll(), where they first build up the linked nodes and then add them all to the tail. However, a bug allowed us to overflow the size, resulting in a negative count. In this newsletter we look at this bug, and also how it was fixed in Java 26.

Issue 327 - ShuffleGatherer

Instead of shuffling our stream at the end in the collect() method, we can also shuffle it in stages using the new stream gatherers. This allows us to shuffle sections at a time and even support infinite streams.

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.


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New Java features

Posted by Michael Levin on August 29, 2025 at 5:32pm 0 Comments

August 28 2025, Newsletter no. 297 (this newsletter is available in html format at http://www.javaperformancetuning.com/news/news297.shtml )



As usual before a Java release, I'm listing all the new…

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Free Eclipse book, recently published

Posted by Michael Levin on August 24, 2025 at 11:59am 0 Comments

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.…
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What is vibe coding?

Posted by Michael Levin on June 9, 2025 at 9:37am 0 Comments

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:

  1. Coding based on intuition or feel

    Instead of rigidly planning everything out, you’re:

    • Freestyling as you…
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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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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.

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Dev2Next at Colorado Springs Marriott

September 29, 2025 at 6pm to October 1, 2025 at 7pm
It's hard to believe, but we're in the last few weeks heading up to the dev2next 2025 conference. I'm eager to welcome speakers and attendees at the event. The Near Time Registration is open for those who have been waiting to get their final approvals to attend. Hotel rooms reserved, flights booked, meals planned, swags ordered (did I say swags), I can't wait for the…See More
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New Java features

August 28 2025, Newsletter no. 297 (this newsletter is available in html format at http://www.javaperformancetuning.com/news/news297.shtml )As usual before a Java release, I'm listing all the new performance features in the upcoming release, this time for Java…See More
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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

AWS Introduces M4 and M4 Pro Mac Instances for Faster Apple App Development

AWS has recently launched two new Mac instances (M4 and M4 Pro) built on Apple's latest M4 silicon. The new EC2 instances provide faster CPU performance, enhanced graphics, and increased memory for building iOS and macOS applications.

By Renato Losio

Agoda Leverages ChatGPT in the CI/CD Process for SQL Stored Procedure Optimization

Agoda started utilizing ChatGPT to optimize SQL stored procedures (SP) as part of their CI/CD process. After introducing the automated LLM-assisted step, the company observed shortened stored procedure optimization times, which lightened the load on DB developers. Agora works on making ChatGPT more accessible for SP optimization outside of the CI/CD pipeline.

By Rafal Gancarz

Presentation: Scaling the BBC Design System: Tooling, Community, Governance and Gardening

Sophie Beaumont shares how the BBC's web design system supports over 10 brands and 25 engineering teams, handling 4.8 billion requests monthly. She explains their federated contribution model, which combines automation, mandatory ownership, and a collaborative gardening approach to create a scalable, maintainable, and highly accessible system.

By Sophie Beaumont

Anthropic Reveals Three Infrastructure Bugs behind Claude Performance Issues

Anthropic recently published a postmortem revealing that three distinct infrastructure bugs intermittently degraded the output quality of its Claude models in recent weeks. While the company states it has now resolved those issues and is modifying its internal processes to prevent similar disruptions, the community highlights the challenges of running the service across three hardware platforms.

By Renato Losio

Podcast: Building Engineering Culture Through Autonomy and Ownership

In this podcast Shane Hastie, Lead Editor for Culture & Methods spoke to Marcos Arribas about building and scaling engineering culture as an organisation grows, emphasizing autonomous teams, ownership mentality, progressive feature rollouts with flags, small pull requests, strategic AI adoption, and the importance of hiring junior engineers for long-term organizational growth.

By Marcos Arribas

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