For no reason at all, I gave jclasslib, my open-source JVM bytecode viewer, to a coding agent and told it to profile with the JProfiler MCP server.

AI coding agents are confident. On performance problems, they are often confidently wrong. I pointed Claude Code at CommaFeed. Connected to the JProfiler MCP server, the agent found a database hotspot, proposed a fix, handled the review, and got the PR merged.

Most performance bugs in Java applications never get profiled. The friction is too high. Switching tools, setting up sessions, interpreting results. Profiling only happens when something is already broken in production.

1/ In JProfiler 16, timeline views, including thread history and probe timelines, support row pinning. Selected rows can be pinned to a dedicated area at the top of the view via the context menu. The order of pinned rows can be customized using drag-and-drop.

1/ JProfiler 16 introduces deobfuscation support for snapshot comparisons. Previously, comparing snapshots from obfuscated applications required manual mapping. The comparison window now includes a "Deobfuscate" option during file selection.

1/ In JProfiler 16, the node detail dialog has been updated to provide cumulative statistics when multiple nodes are selected in hot spot views. This allows for immediate aggregation of performance data across disparate nodes without manual calculation.

1/ A new analysis feature in JProfiler 16 allows for calculating the contribution of individual threads within a cumulative call tree. By selecting "Show Threads" on any node, users can access a percentage breakdown of all threads contributing to that specific execution path.

1/ JProfiler 16 adds dedicated support for virtual thread dumps. The thread dumps view now provides distinct actions for synchronous platform thread dumps and asynchronous virtual thread dumps,

1/ JProfiler 16 introduces significant optimizations for the JFR event browser. Data in the lower views is now pre-calculated, and the event table supports incremental loading. Sorting and total calculations now consider the entire filtered dataset, not just the visible subset.

I'm continuing to record screencasts for new features in JProfiler! The new AI probe deserves another screencast: Modern agentic applications perform diverse logical tasks through a single interface, yet they often appear as an undifferentiated stream in profilers.

1/ In JProfiler 16, the probe call tree and hot spots views can now have a metric selector. In the "Files" or "Sockets" probes, you can toggle between event duration and specific metrics like "Read Throughput" or "Write Throughput."

1/ JProfiler 16 introduces a reimplemented, file-based backend for probe event recording. This architectural change moves away from memory-limited storage, enabling high-throughput recording and analysis of massive event sets numbering in the millions.

I'm back at recording screencasts for new features in JProfiler!

1/ The JProfiler 16 installer has been streamlined to run without requesting admin privileges by default. Elevated permissions are now only required if you explicitly choose to install for all users via the customized execution mode.

1/ JProfiler 16 features a complete UI overhaul with a modernized visual design and a new icon set. The update includes refreshed light and dark themes to improve readability and workspace aesthetics.

1/ For the new AI probe in JProfiler 16, we've added a cool demo session to let you explore the probe. Start "LLM demo" in the start center and activate the AI probe to get started.

1/ Your LLM calls are slow and expensive, but you have no idea which model interactions are burning tokens. At least until you got the new AI probe in JProfiler 16, which captures every chat request and embedding through LangChain4j and Spring AI and connects them to your code.

Big JProfiler release coming up! Lots of work on the UI and also - cue the drumroll - introducing AI features (expectably, but not in the way you might expect). Stay tuned 👀 www.ej-technologies.com/jprofiler

JProfiler works even in the most restricted, high-performance environments imaginable. Like a Nanos unikernel. Check out this walkthrough by Angelo Rubini: foojay.io/today/unike...

1/ ⭐ New in install4j 12: UI scaling has been implemented for installer applications. You can now scale the size of installer applications by an arbitrary percentage on the "Installer->Look & Feel" step.

1/ ⭐ New in install4j 12: Support for the new Apple .icon bundles was added.

⭐ New in install4j 12: A JDK provider for IBM Semeru was added. Semeru runtimes are IBM-branded OpenJ9 JDKs. You can now select these JDKs for bundling on the "General Settings->JRE Bundles" step.

1/ ⭐ New in install4j 12: Support for renaming for RPM and DEB media files has been added. Whenever you rename the "Short name" on the "General Settings->Application Info" step, your package name will change, and upgrades will no longer work, leaving old versions installed.

1/ ⭐ New in install4j 12: Support for streamlining installations has been added. This builds on the feature in previous versions where screens could be skipped for update installations if the user confirmed an update installation in the "Update alert" form component.

1/ ⭐ New in install4j 12: The "Add a Startup Executable" action has been improved in several ways:

1/ ⭐ New in install4j 12: Support for the Apple Service Management framework. This should be used for single bundle archives instead of "Install a service" and "Add a startup executable" actions.

1/ ⭐ New in install4j 12: Code signing is now a separate section in the install4j IDE with different steps for Windows and macOS.

1/ ⭐ New in install4j 12: The way installers set their installation directory has been reworked, adding substantial new functionality and greatly extending flexibility.

1/ ⭐ New in install4j 12: The binary architecture on macOS has been reworked. Previous versions of install4j used shell scripts for daemons and launchers. Now, all launchers are binary launchers that start the JVM in-process. This has the following benefits:

1/ ⭐ New in install4j 12: Widget styles have been added to change fonts, colors, and other aspects of all widgets that are shown in installer applications.

1/ Microsoft just released version 3.17.1 of their Gradle support for VS Code, which now includes my contribution to enable profiling for Gradle tasks. github.com/microsoft/v...

1/ ⭐ New in install4j 12: DMGs on macOS can now be styled right in the install4j IDE. You can apply backgrounds, position and the app icon's size manually and add symbolic links like the /Applications directory at arbitrary positions. Also, the bounds of the Finder window can be set.

1/ ⭐ New in install4j 12: The IDE has a new UI with a refreshed visual appearance and new icons. We hope you like it! We have light and dark themes.

We've just released install4j 12 with lots of new functionality 🎉 Big thanks to all our customers who suggested many of the new features! Take a look at the "What's new" page at 💡 www.ej-technologies.com/install4j/w... and try it yourself at 🚀 www.ej-technologies.com/install4j/d...

☕️🎙️"jclasslib--The 3k Stars Bytecode Editor"--an airhacks.fm conversation with @ingokegel.bsky.social about bytecode manipulation, Java FX, Swing and modern UIs is ready to listen 👉 adambien.blog/roller/_jcla... #airhacks #podcast #java

"JProfiler Visual Studio Code Integration -- The Kotlin Multiplatform Killer Use Case" -- an airhacks.fm podcast conversation with Ingo Kegel / @ingokegel.bsky.social is ready to listen 👉 adambien.blog/roller/jprof... #java #podcast #airhacks #kotlin

After some drama earlier this year, modular Adoptium JDK bundles are back in install4j: Temurin 24.0.2 now provides JMOD files as a separate artifact. Thanks again to @adoptium for the engagement and the positive outcome! Upgrade to the latest install4j to take advantage of this new feature.

Async operations can speed up applications and improve responsiveness, but they also introduce complexity. Especially in the context of profiling, understanding what really happened and why can be surprisingly tricky.

We just rolled out a significant upgrade to our website: New visuals, full dark mode support, and smarter documentation with semantic search.

OMG, I didn't realize how bad this redesign was. No wonder opening a Google app on my phone is like hitting the "I'm feeling lucky" button. This is just a different kind of monochrome. Bring back color coding 🙏

Many users requested that we publish our artifacts to Maven Central. With install4j 11.0.4 the switch is now complete: all our artifacts are available there. Our custom repository remains online for older releases. 👉 www.ej-technologies.com/blog/2025/0...

JEP 493 threatened cross-platform JRE bundling by allowing JDK vendors to drop JMOD files from the JDK. Adoptium was first to do this in Temurin 24.0.0, breaking modularized JRE bundle creation in install4j.

💡 The JProfiler tips roundup for May 2025 covers JavaScript XHR views, the integrated MBean browser and opening HPROF and PHD snapshots in JProfiler. Check it out at 👉 www.ej-technologies.com/blog/2025/0...

📢 JVM Performance Watch: May 2025 roundup From AOT caching and JFR safepoint sampling to Generational Shenandoah and JFR method-level tracing, here's a roundup of this month's JVM performance news: 👉 www.ej-technologies.com/blog/2025/0...

📢 We just released JProfiler 15.0.2 with several important fixes for IDE integrations, support for Apache HttpClient 5.​5 in the HTTP client probe and one new feature for flame graphs.

1/ 💡 Did you know JProfiler can open native HPROF and PHD heap snapshots from any JVM, including HotSpot, Android, and IBM J9?

1/ 🔍 JVM performance watch: JEP 520 adds method-level timing and tracing to JFR via JVM-managed bytecode instrumentation.

1/ Just updated our lightweight Java launcher generator (and install4j’s little sibling). One new feature in 10.0 is the option to unbundle the launcher runtime from the executable.

ICYMI: 📢 New in JProfiler 15: Improved handling for agent archive downloads in remote profiling bsky.app/profile/ing...

ICYMI: 📢 New in JProfiler 15: A full Korean locale has been added. bsky.app/profile/ing...