Brian Goetz
@BrianGoetz
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Java Language Architect at Oracle. Author, Java Concurrency in Practice (). Also, cats.
Williston, VT
Joined May 2008
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Dear Recruiters: Yes, my job title has "Java" and "Architect" in it. No, that doesn't mean the the "Java Architect" position you are trying to fill is "a great fit for my experience."
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@scrumtuous
To explain API to a non-programmer, first explain "interface". Everything we use in the real world has an interface; a car's interface includes steering wheel and pedals. An API is the interface to a software library: code packaged for reuse, such as manipulating audio files.
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I despise the hellscape of no-name, low-price, low-quality items that Amazon has become. Any search is overwhelmed with garbage, and they crowd out higher-quality goods.
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@pchiusano
Every "declarative" language eventually becomes a (terrible) programming language, just without the aid of actual language design. We learned this with XML 20y ago; it astounds me that people seem to think the lesson of that age was that we used the wrong shape brackets.
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The Java Language and Tools team at Oracle is hiring! We are looking for programming language and compiler experts to help build the future of the Java Language. Come join a fantastic team with tremendous impact.
DMs open. No recruiters please.
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@AlyssaJoyJaffee
Serious Q: do you routinely send *them* a thank-you note for taking the time to learn about your company? Seems that politeness and attention to detail cut both ways here. (Plus: you were just doing your job, and were paid; if anything, their action is more thank-worthy.)
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@norootcause
They hit the sweet spot of a truly excellent product, a culture of "it's never good enough" and continuous improvement, and a very reasonable price. When they started selling IJ for 300-400, other tools were selling for 1000-2000.
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Every time someone says "Just add a flag for that" I'm going to show them this picture.
Back when there were 12 pence in a shilling and 20 shilings in a pound, the IBM 1401 computer had optional hardware (i.e. transistors) to do arithmetic on pounds/shillings/pence. Of course, there were two incompatible data standards—BSI and IBM—so this knob selected the format.
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@mariofusco
@smdiehl
But but ... it's a means of payment. Wait, no, its a store of value. Wait, no, its an inflation hedge. Wait, no, its creating entire new forms of digital ownership. Wait, no, its creating play-to-earn ecosystems. Wait, no, its a proxy for tech stocks. Wait, no...
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RIP Crazy Bob.
I will miss your energy, your kindness, your smile, and that intense stare that earned you your nickname. Rest In Peace brother.
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@debugagent
@heinzkabutz
Tip: don’t obsess over micro performance details. They generally matter way less than you think, way less often. Write clear correct code. Optimize when strictly necessary. Free up brain cycles for actual value-creating activity.
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Wow are these new AMD chips impressive. Just upgraded my dev workstation from an 8th gen i7 to a Ryzen 9 5900x; building OpenJDK went from 4m to 1m.
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@tagir_valeev
Performance tip: don't let performance tips skew your development! Write clear, correct code. Its probably already fast enough. If it's not, start measuring before randomly applying performance tips. Then measure after applying the tip, and if it doesn't help, roll back.
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Most devs think language design is basically the same as programming. It's not. It's more like writing all possible programs simultaneously.
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Allen has said some pretty stupid things in the pursuit of engagement, but this takes the cake. You can’t be a team if you are not colocated or won’t mob? There are great teams that don’t work your favorite way. Saying those aren’t teams is disqualifyingly stupid. And insulting.
Teams vs. Slack? How about neither? Async written communication is probably the worst possible way to work. Let's replace that with actually talking to each other. Ensemble/Mob programming for the win!
(And to head of the inevitable. No, you can't do that if your team is
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Highly recommended: an authoritative and unopinionated review of concepts, tradeoffs, and tools for building data-driven applications.
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Viktor Klang has done some righteous work here in adding principled extensibility for the API. Draft design document here , discussion at corelibs-dev
@openjdk
.
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@pickover
Sorry, this is not mathematics, it is behavioral finance. Different people are going to have different points at which their utility metric goes nonlinear. Sure, "expected value", a math concept, may be involved. But it's not helpful to confuse people about what mathematics is.
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Interested in Java-Native interop? Check out this early-adopters guide for using Project Panama to access TensorFlow, BLAS, OpenGL, and others (and add your own):
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@engineeringvids
Depends on the relative size of the bottle and tube apertures. If the bottle aperture is big enough, 1 will fill first.
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@stuarthalloway
Semicolons are useful. They serve as detectors for people who focus excessively on the wrong things; complaints about them are a very reliable indicator of not having useful things to say about language design.
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@mariofusco
If anything, the problem with this book is that it was taken too literally, like a set of wrenches to be issued to every new programmer (& the training industry was happy to oblige.) It was meant as a vocabulary for experienced programmers to refer to, and succeeded at that.
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Periodic reminder: nearly everyone in tech should probably read this piece:
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After almost two years of planning and every imaginable delay (materials, labor, customs, freight, weather, etc), the sauna is now operational! Just in time for VT winter.
Framing & exterior by a local builder; everything internal was DIY with help from my boys.
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The Java team at Oracle just gets better and better.
Chilling post-Google was nice, but I'm elated to tell y'all that I've accepted a position in the
@java
Platform Group at Oracle!
In the libraries team I'll be working with people like
@stuartmarks
@viktorklang
@PaulSandoz
@biboudis
@jddarcy
@PMinborg
and the list goes on...
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Once again, Java Concurrency in Practice is on ridiculous discount at Amazon ... good time to pick up a copy!
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Garbage-collecting the garbage collectors!
New candidate JEP: 366: Deprecate the ParallelScavenge + SerialOld GC Combination:
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For some reason known only to the algorithm, JCiP is on massive discount at Amazon. If you don't have a copy, now's a good time!
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My friend
@heinzkabutz
has produced an excellent self-study course based on Java Concurrency in Practice (with some updates for Java 8 and 9). JCiP fans can get 20% off through Jan 9 with this link:
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@Pixel_duck
@heinzkabutz
Write clean, readable code. Worry about performance when you have an actual performance problem; 99% of the time, the clean code is fine. It’s easy to refactor clean code to something dirty if you need to.
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For all the folks who love to perpetuate the myth that its only the LTS releases that count, this is an excellent reminder that every Java release is a full-feature release, packed with hundreds of small improvements and fixes.
#MovingForwardFaster
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@starbuxman
@java
Both answers are terrible! Because they both imply you should either use it all the time, or never. Both answers are wrong. Programming is an activity that requires judgment.
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@BillyKorando
Field should be private and final.
Constructor should accept List, not ArrayList.
Constructor should do defensive copy with .copyOf().
toString should use String::format.
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@Brayanmnz_
@NiestrojRobert
@java
But in general, "so people can type fewer keystrokes" is almost always the wrong criteria to prioritize when making decisions. Reading code is more important than writing code; we should optimize for the clarity of the resulting code, not how many keystrokes it took.
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I’m not sure I want to shop here. The prices might change from the shelves to the cashier!
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@debugagent
@_JamesWard
The irony of this statement is overwhelming.
Spring was born of the YAGNI belief that J2EE was over engineered. Then, as it discovered the infinite sequence of “and you also need”, it accreted them bit by bit, recreating the monster of it’s origin myth. Like a Greek tragedy.
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Brilliant nudge:
@intellijidea
now underlines non-effectively-final locals. A nice, but unobtrusive nudge to squeeze gratuitous mutability out of your code.
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Video from my keynote at the "Java at Google Summit" is up:
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My friend
@heinzkabutz
has produced an excellent self-study course based on Java Concurrency in Practice (with some updates for Java 8 and 9.) . JCiP fans can get 25% off through the end of April with this link:
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@gunnarmorling
For more reasons than you might think, including lots of developers think their code is "good" when it is just OK.
Bad code needs more documentation because it has to explain how it works. Good code needs less explanation of how, which makes more room for *why*.
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Lots of people talking about
My feed today: "this is great, but why didn't you idiots do X at the same time, its so easy"
Also my feed today: "this is so dumb, why are you idiots wasting your time with stuff like this"
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@DThompsonDev
Humility. Empathy. Respect. Clear communication. Curiosity. Selflessness. Teamwork. Critical thinking.
Coincidentally, these will also make you a better person.
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@vmbrasseur
Don't EVER ask a speaker to use your slide format, unless you're paying them a market rate to create content for you and only you.
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@biancoresearch
Pretty misleading Y axis; the real story is how little QT there has actually been.
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@practicingdev
More important than any of those things:
- communicating clearly
- listening to others
- empathy
- realizing that not everyone thinks like you do
- valuing things you're not good at (sales, management, etc)
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@triketora
Slowly and continuously. This has been happening for at least the last 30 years, just getting progressively worse bit by bit. The obvious reason would be: we perceive titles to be cheaper to give than salary or stock.
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Project Amber (Local Variable Type Inference, and more, for Java) is open:
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RIP Fred Brooks.
I read MMM in 1988 and it was eye opening. Many of the lessons still ring true today.
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@moxie
Reading code is unquestionably more important than writing code; less readable code depreciates faster. But not all concision affects readability the same. Some are just about fewer keystrokes, but others remove noise so you can see the more important stuff. Judgment is needed!
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This one was a long time coming, but it was worth the wait.
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@d_feldman
@smdiehl
It's more than terrible. It's so painfully naive (about both code *and* law) that it's hard to even start enumerating what is wrong. It's like "legislate pi = 3" and "just write code without bugs" got drunk and had a baby; it wishes away all the complexity of the real world.
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@CedricChampeau
Sometimes Java developers insist on whining when the glass is only 99% full, for no apparent reason.
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I see a lot of conferences reformatting as virtual events, but are attendees actually motivated to participate in virtual conferences, or is YouTube already a good enough alternative? To me, conferences are more about f2f interactions, since I can get the info elsewhere already.
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Dear
@Zoom
: please give me the ability to adjust the volume *individually* for each meeting participant.
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The reports of "mild symptoms" are clearly fake news. He would only have the best symptoms.
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My friend
@heinzkabutz
has produced an excellent self-study course based on Java Concurrency in Practice (with some updates for Java 8 and 9). JCiP fans can get 20% off with this link:
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@GergelyOrosz
It's also a gateway drug into deeper understanding of computing. Databases have been solving impossibly hard problems for way longer than most developers have been alive, and SQL is an excellent jumping-off point for learning from accumulated experience.
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Periodic shilling: Java Concurrency in Practice again on super discount at Amazon
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It's hard to get rid of books, even when clearly obsolete. Trawling for candidates yesterday, I found a JSP book from 2000. Toss, right? But the intro was so deliciously naive about "today's problems come from yesterday's solutions" that I needed to keep it as a cautionary tale.
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@AndrewCMyers
@_joemag_
There is a reason languages are designed so that not every input string is a valid program.
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Things to love about
#curryon
: giving a provocative talk called "FP is dead" and the first at the mic for questions is Simon PJ...
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I am so tired of hardware that is dependent on (and cannot be separated from) its proprietary bad software. That includes my car, every scanner ever built, Sonos, ...
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@SusanPotter
@_JamesWard
The problem is not that a given set of concurrency facilities are imperfect or that concurrency is hard. The schadenfreude is coming out of the woodwork because a simplistic, mediocre set of mechanisms have been held up as a silver bullet, but the emperor has no gun.
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I am such a huge fan of Grant Sanderson's "3 Blue, 1 Brown" series of math videos. I love the teaching of math as much as I love math itself, and Sanderson is a phenomenal teacher, who clearly loves what he is doing.
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My non-manifesto:
Valuing clear analysis about tradeoffs, priorities, goals, and business value over manifestos.
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@RVAwonk
and if "stupid" doesn't work, apparently the move is to crank it up to "stupid stupid". That'll do it for sure!
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@daveadams
@ArcusCoTangens
@philspitler
@mhartl
And if you do, you're probably doing it wrong. It's pretty hard to out-code libraries written by world-class experts, who surely had the books open at their desks when writing them. That's why we have libraries; to reuse the expertise of specialists.
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Every time I click on a YouTube link, it pollutes my recommendation profile. Then I have to watch like ten cat videos to get it back to normal. Can we just have a button for this?
#kthxbye
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Every day on Twitter, I feel like I'm living in the modern version of the Monty Python "I'd like to buy an argument" sketch. Except no one is paying.
Clearly this is a market failure. I should launch an Argument-as-a-Service (AaaS) platform.
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@MichelSchudel
You’re thinking about this as “just one more method”. But, this line of thinking really is “a million more methods”. And if we did this, that just makes a million “you added this trivial method, why not that one” questions. Let’s focus on actually important stuff.
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@editoremilye
Sounds like she is ready for the Scientific Method talk. "When a hypothesis and an experiment love each other very much ...."
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@vlad_mihalcea
They were being proven wrong even in 2002. The "C is the speed of light" crowd are only slightly more sophisticated in their understanding of performance than the "MongoDB is web scale" crowd.
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