Viewing profile — haglin

I work on OpenJDK, so I may be biased, but I’ve also found that JFR works really well with LLMs. $ java -XX:StartFlightRecording:maxsize=10M,filename=dump.jfr -jar app.jar $ jfr vi…

I find inheritance works best when you model things that don't exist in reality, but only as software concepts, for example, an AbstractList, Buffer or GUI component.

It would be in the "Files changed" section on GitHub, not in the git history. If you don't want to see the context, you can turn it off.

Splitting up a PR is a lot of work, especially if you want each commit to compile, but it would be great if you could categorize changes using 5–10 colors and then have checkboxes …

Yeah, Windows 2000 was probably the best operating system Microsoft ever produced. It had no crashes, a snappy/intuitive/sleek user interface, and DirectX support for games. I am c…

Since JDK 11 (released in 2018). "Launch Single-File Source-Code Programs" https://openjdk.org/jeps/330

JFR only samples running Java methods. I would guess at least some of the bottlenecks are in hardware, the operating system or in native code (including the JVM) in this case.

"Left unquestioned, assumptions and expectations could have caused us to miss one of the most impactful changes we’ve made to our operational defaults in a decade"

> the only knock you can put on Java for reliability is null-safety FWIW, nullity control has been added to the Valhalla project, so it might be fixed going forward. https://youtu.…

Two years it too short. The reason I now use gmail and not hotmail is because Microsoft did a similar thing 20 years ago. When I lost my hotmail account, I thought I might as well …

An alternative to avoid safepoints (only samples executing threads) var r = new RecordingStream(); r.enable("jdk.ExecutionSample").withStackTrace().withPeriod(Duration.ofMillis(1))…

There are multiple ways to represent an optional value, for example: 1) an empty list/array 2) throw an exception if the return value is missing. 3) -1 Optional can be used as a be…

Hotspot has sub-millisecond GC pause times. "But as long as your system isn’t heavily over-provisioned, you can expect to see average GC pause times of around 0.05ms (50µs) and max…

And in JDK 16, ZGC has concurrent thread-stack processing, which typically reduces GC pauses below 1 ms https://openjdk.java.net/jeps/376 https://youtu.be/88E86quLmQA?t=1525

The JDK comes with a powerful memory leak tool. $ java -XX:StartFlightRecording:settings=profile MyApp $ jcmd MyApp JFR.dump paths-to-gc-root=true filename=dump.jfr $ jfr print --e…

In JDK 14, Flight Recorder events will be available for monitoring. try (var rs = new RecordingStream()) { rs.onEvent("jdk.GCPhasePause", event -> { System.out.println(event.getDur…

New IO.

I haven't tried serverless, but shouldn't that be Java's cup of tea? The JVM can load code dynamically and adapt the runtime to the work load. Maybe there is a framework missing, s…

For arbitrage that must happen really fast, FPGAs is the way to go, and for complex code that needs to be rewritten often and quickly, Java is probably a better fit than C++.

If you want to sell software or services to the government you need to be 508 compliant https://www.section508.gov/sell

JDK 11 comes with a new HttpClient. Might be useful and fun to learn. https://docs.oracle.com/en/java/javase/11/docs/api/java.net....

With ZGC[1], value types[2] and Panama[3], Java will be great platform for gaming and 3D graphics. Write once and it will work on Linux, Windows and Mac OS X. [1] https://openjdk.j…

Data Classes for Java https://cr.openjdk.java.net/~briangoetz/amber/datum.html

I like to see simplified loops in Java. For example, traverse two collections/arrays of the same size simultaneously. for (var f : fathers, var m : mothers) { families.add(new Fami…