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Java Flight Recorder (JFR) captures an enormous amount of detail about what your application is doing — but raw JFR files are only as useful as the tools you have to explore them....
In the first article, we got started with Jeffrey Microscope and learned to read a single flamegraph — the timeseries, search, tooltips, and the allocation and wall-clock variants....
Learn how to track and analyze Spring application startup with ApplicationStartup, BufferingApplicationStartup, FlightRecorderApplicationStartup, and custom startup steps. The pos...
Attach a profiler to see what the JIT is really doing, and you’ve just changed what the JIT does. On the JVM, that’s not a metaphor. It’s a specific, mechanical consequence of how...
How the OTel Java agent attaches at JVM startup, what it captures automatically across JDBC, Spring MVC, and Kafka, and where @WithSpan picks up the rest. Adding tracing to a Java...
How value classes differ from records — no identity, no heap header — where they outperform records in tight loops, and the Valhalla mental model in 300 words. Status check: As of...
JEP 519 shipped stable in JDK 25. It shrinks every single object header on the heap. It’s one JVM flag. Most teams still haven’t flipped it. Here’s a JVM optimization that costs no...
JDK 24 removed the monitor-related carrier-thread pinning that stalled Netflix and similar teams on Java 21. What has replaced it on JDK 25 LTS is downstream-resource saturation: T...
Java continues its evolution with another major release. Java 26 introduces important improvements across language features, runtime performance, garbage collection, concurrency, s...
In Part 1, the minimal deployment showed constraints traveling with the proxy: authentication, encryption, hardened deserialization, all declared in configuration and enforced at t...
JEP 401, integrated into JDK 28, introduces value objects. These new class instances feature final fields, altered behavior for equality checks, and stricter construction and synch...
Tim Lindholm, Java's original JVM maintainer, shares with El Reg some of the grungy build details the doc glosses over
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