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Author. Java Champion. Writer of blogs. Creator of the OSS Java library Eclipse Collections. Inspired by Smalltalk. Opinions are my own.
Author of "Eclipse Collections Categorically: Level up your programming game"
Author. Java Champion. Writer of blogs. Creator of the OSS Java library Eclipse Collections. Inspired by Smalltalk. Opinions are my own. Author of "Eclipse Collections Categorically: Level up your programming game"
A fun blog about Eclipse Collections.
https://www.fxjavadevblog.fr/eclipse-collections-en/
Author. Java Champion. Writer of blogs. Creator of the OSS Java library Eclipse Collections. Inspired by Smalltalk. Opinions are my own. Author of "Eclipse Collections Categorically: Level up your programming game"
I've been writing about better building blocks in #Java. Several blogs since March 2026 including:
• Empty should be empty
• Lazy & eager performance
• Memory costs for lazy iteration
• Intention Revealing Names
• Collecting Collectors
• "Fat-free" Lambdas
• Snow Leopards & Tribbles
Stories to inspire, including the blog linked below from March 2025. 🙏
https://donraab.medium.com/building-better-building-blocks-7e61dc71d519?source=friends_link&sk=a2c8fab54004249e705f190e83422b2f
Author. Java Champion. Writer of blogs. Creator of the OSS Java library Eclipse Collections. Inspired by Smalltalk. Opinions are my own. Author of "Eclipse Collections Categorically: Level up your programming game"
Seen on a heap.
String: 3.4 million instances
byte[]: 3.7 million instances
Stream: Hold my 🍺
MatchOps: Hold my 🍺🍺🍺
Shocked I was able to see so many ReferencePipeline$Head (Stream) and MatchOps inner class instances in a jmap heap histogram. Created and gone in a few blinks of an eye.
Cheers to the amazing developers who make object allocation blazingly fast and to the developers who build the world class Java garbage collectors. Thank you! 🍺🍺🍺
Author. Java Champion. Writer of blogs. Creator of the OSS Java library Eclipse Collections. Inspired by Smalltalk. Opinions are my own. Author of "Eclipse Collections Categorically: Level up your programming game"
My latest blog: Snow Leopards and Tribbles in Java Heaps
https://donraab.medium.com/snow-leopards-and-tribbles-in-java-heaps-a3f20fd5520c?source=friends_link&sk=f82a9c0eed80bcc1330ce94781f48ae7
Author. Java Champion. Writer of blogs. Creator of the OSS Java library Eclipse Collections. Inspired by Smalltalk. Opinions are my own. Author of "Eclipse Collections Categorically: Level up your programming game"
Author. Java Champion. Writer of blogs. Creator of the OSS Java library Eclipse Collections. Inspired by Smalltalk. Opinions are my own. Author of "Eclipse Collections Categorically: Level up your programming game"
My latest blog: "Fat-Free" Lambdas in Java
https://donraab.medium.com/fat-free-lambdas-in-java-bf228da0613b?source=friends_link&sk=a4280feb264939feeb7db9e9edca5663
Author. Java Champion. Writer of blogs. Creator of the OSS Java library Eclipse Collections. Inspired by Smalltalk. Opinions are my own. Author of "Eclipse Collections Categorically: Level up your programming game"
"Saving the planet, one Collector at a time."
I can't un-new the billions of Collector instances that were created since 2014, but I can share ideas and alternatives for the future. Thanks for reading! 🙏
#Java #EclipseCollections
https://donraab.medium.com/counting-and-collecting-collectors-d69b7c9aaca0?source=friends_link&sk=ef73f56026d1afcf97e869f8ae990ea9
Author. Java Champion. Writer of blogs. Creator of the OSS Java library Eclipse Collections. Inspired by Smalltalk. Opinions are my own. Author of "Eclipse Collections Categorically: Level up your programming game"
I can't predict the future. I believe we can all help invent the future when we work together. Our present is a bit murky and uncertain. If it isn't the future we want or need, maybe we shouldn't be chasing it so hard.
https://donraab.medium.com/the-future-ecbc2e3b2054?source=friends_link&sk=df1850466a2999600fd475d673e31d0b
Author. Java Champion. Writer of blogs. Creator of the OSS Java library Eclipse Collections. Inspired by Smalltalk. Opinions are my own. Author of "Eclipse Collections Categorically: Level up your programming game"
Have you upgraded to #Java 25 and enabled Compact Object Headers yet?
Author. Java Champion. Writer of blogs. Creator of the OSS Java library Eclipse Collections. Inspired by Smalltalk. Opinions are my own. Author of "Eclipse Collections Categorically: Level up your programming game"
I still won't use GenAI for art or writing. Why? This was my idea. I clicked and dragged the shapes with the mouse. I fiddled with the fills. I drew the legs on the cuboid. This is my opus. The computer was my canvas, not just a prompt for someone else's muse. 🎨🧑🎨
https://donraab.medium.com/computer-aided-in-the-eighties-4439316e1fc0?source=friends_link&sk=225541aa6fe4cf94697a2e7d8f881709
Author. Java Champion. Writer of blogs. Creator of the OSS Java library Eclipse Collections. Inspired by Smalltalk. Opinions are my own. Author of "Eclipse Collections Categorically: Level up your programming game"
Author. Java Champion. Writer of blogs. Creator of the OSS Java library Eclipse Collections. Inspired by Smalltalk. Opinions are my own. Author of "Eclipse Collections Categorically: Level up your programming game"
Author. Java Champion. Writer of blogs. Creator of the OSS Java library Eclipse Collections. Inspired by Smalltalk. Opinions are my own. Author of "Eclipse Collections Categorically: Level up your programming game"
Author. Java Champion. Writer of blogs. Creator of the OSS Java library Eclipse Collections. Inspired by Smalltalk. Opinions are my own. Author of "Eclipse Collections Categorically: Level up your programming game"
Do you love a good mystery? Do you know what the type "java.util.Collections$2" is in #Java? I didn't know until I blogged about it.👇
In my latest blog, I explain this and other mysterious class names you may encounter in Java.
Thanks for reading! 🙏
https://donraab.medium.com/what-if-java-consistently-used-intention-revealing-names-for-types-7b9cbc39f65f?source=friends_link&sk=38d28dba7f021f2bcf7f41378e6600e8
Author. Java Champion. Writer of blogs. Creator of the OSS Java library Eclipse Collections. Inspired by Smalltalk. Opinions are my own. Author of "Eclipse Collections Categorically: Level up your programming game"
In the early days of the pandemic, I wrote a blog titled "Eager is Easy, Lazy is Labyrinthine." I struggle with spelling Labyrinthine every single time. I could have used mazy instead and rhymed, but I like the challenge of spelling labyrinthine. 🤷♂️
https://medium.com/javarevisited/eager-is-easy-lazy-is-labyrinthine-b12605f13048?source=friends_link&sk=9d8ec91aa6f1af48ee7333ad03b19ed0
Author. Java Champion. Writer of blogs. Creator of the OSS Java library Eclipse Collections. Inspired by Smalltalk. Opinions are my own. Author of "Eclipse Collections Categorically: Level up your programming game"
Add this to the list of things I hadn't thought to measure with JOL before, but now that I did, I'll be more careful with local capture of variables in lambdas.
https://stackoverflow.com/questions/79932789/how-to-measure-the-memory-cost-of-lambdas-in-java-25
Author. Java Champion. Writer of blogs. Creator of the OSS Java library Eclipse Collections. Inspired by Smalltalk. Opinions are my own. Author of "Eclipse Collections Categorically: Level up your programming game"
Author. Java Champion. Writer of blogs. Creator of the OSS Java library Eclipse Collections. Inspired by Smalltalk. Opinions are my own. Author of "Eclipse Collections Categorically: Level up your programming game"
My latest blog: I Used Five Command Line Java Tools This Week and I Feel Good
https://donraab.medium.com/i-used-five-command-line-java-tools-this-week-and-i-feel-good-a07531fefb02?source=friends_link&sk=ec2cc3fb5f20fb7ae30b57f994601234
Author. Java Champion. Writer of blogs. Creator of the OSS Java library Eclipse Collections. Inspired by Smalltalk. Opinions are my own. Author of "Eclipse Collections Categorically: Level up your programming game"
This was a very nice surprise, announced during the first JavaOne that I have missed in over a decade. Thank you to the JCP and Heather VanCura. Thanks to Chandra Guntur for attending the JCP Event at JavaOne 2026, accepting and then hand delivering the award. 🙏
https://donraab.medium.com/on-winning-jcp-member-participant-of-the-year-for-2025-at-javaone-2026-3c977f7049da?source=friends_link&sk=ab73b42c391a3a734db6a9b1d6ee21e8
Author. Java Champion. Writer of blogs. Creator of the OSS Java library Eclipse Collections. Inspired by Smalltalk. Opinions are my own. Author of "Eclipse Collections Categorically: Level up your programming game"
Author. Java Champion. Writer of blogs. Creator of the OSS Java library Eclipse Collections. Inspired by Smalltalk. Opinions are my own. Author of "Eclipse Collections Categorically: Level up your programming game"
This image at the end of my last GitHub code review was giving me all the apocalyptic feels.
Author. Java Champion. Writer of blogs. Creator of the OSS Java library Eclipse Collections. Inspired by Smalltalk. Opinions are my own. Author of "Eclipse Collections Categorically: Level up your programming game"
For folks who haven't looked at #EclipseCollections because they don't use the Eclipse IDE. Eclipse Collections (EC) and the Eclipse IDE are both independent projects at the Eclipse Foundation. 💡
Note: I created EC and have coded with IntelliJ for 24 years. 🙏
https://donraab.medium.com/explaining-the-eclipse-prefix-in-eclipse-collections-1d9850d20047?source=friends_link&sk=e6ee8d28bda7a66e2125083de49e8fa4
Author. Java Champion. Writer of blogs. Creator of the OSS Java library Eclipse Collections. Inspired by Smalltalk. Opinions are my own. Author of "Eclipse Collections Categorically: Level up your programming game"
My latest blog: The Ten Year Anniversary and the Next Five Years for #EclipseCollections
The long road of this amazing OSS project continues. With 10 years at the @EclipseFdn@mastodon.social, 14 years as OSS, and 21 years in development, we're just getting started. 💗🦋
https://donraab.medium.com/the-ten-year-anniversary-and-the-next-five-years-for-eclipse-collections-dd1c03758b29?source=friends_link&sk=0cc954c2a4a1c6511f680a646f6a65a2