Open Up your JVM with Open Source Tooling

Carl Chesser @che55er | che55er.io

## Why ## 🤔 <div class="r-fit-text">It's <em>critical</em> to understand what is occurring in your JVM.</div> ___ <small>With knowledge on what tools are readily available without modifying your application, you can quickly understand effective options to diagnose your system.</small> --- ## History ## 🙋‍♂️ I began building an internal course for the company I worked at to help teams diagnose their own Java memory issues. <br /> ...and the course grew.

jvmperf.net

Workshop focused on using open and available tooling on a poorly performing Java service.

## 🧭 ## Our Adventure We are going to explore some tools with rich history in Java for diagnosing different aspects of performance. * JDK Mission Control * Eclipse Memory Analyzer * VisualVM * Demo in jvmperf.net workshop * OpenTelemetry --- ## 🧰 ## Open Source Tooling These tools are not new.<br /> If you are familar with these tools, we will also be sharing their updates over the years. <small>Hopefully you can learn some new tricks on how they can used.</small>

## JDK Mission Control ## 🚀 * Started out as JRockit Mission Control * Open-sourced in 2018 as part of OpenJDK * Continues to get updates / releases (latest: 9.1 - Feb 2025) <small>📄 License: Universal Permissive License (UPL)</small>

## JMC Updates ⭐️ [Additional details from Marcus Hirt's blog.](https://hirt.se/blog/)

## JDK Mission Control Agent ## 🚀 * A bytecode transformer JVM agent * Enables users to add custom JDK Flight Recorder events without changing code * Continues to get updates / releases (latest: 9.1 - Feb 2025) * Introduced in JMC [8.0 release (March 2021)](https://hirt.se/blog/?p=1312), with Agent Plugin in [8.1 (August 2021)](https://hirt.se/blog/?p=1361) <small>🤔 Utilization of JAR in recent releases requires building from source.</small>

## Eclipse Memory Analyzer ## 🔍 * Solid tool for doing Java heap dump analysis. * Has been around (1.0 landed in 2010) * One of the better tools for handling large heap dumps. * Continues to get minor updates (currently 1.16.0 - Dec 2024) <small>📄 License: Eclipse Public License 2.0</small>

Download at [eclipse.dev/mat/download](https://eclipse.dev/mat/download/).<br /> ⭐️ [New and Noteworthy Updates](https://eclipse.dev/mat/1.16.0/noteworthy.html)

## VisualVM ## <img src="img/visualvm.png" width="150" /> * Started out as part of Java 6 * Built on the NetBeans Platform, now with [VS Code Extension 🤩](https://marketplace.visualstudio.com/items?itemName=oracle-labs-graalvm.visualvm-vscode) * Continues to get updates / releases (latest: 2.2 - Apr 2025) <small>📄 License: GNU General Public License (GPLv2)</small>

## VisualVM Updates ## <img src="img/visualvm.png" width="150" /> * Can be utilized with other languages through GraalVM (Ruby, Javascript, Python, R) * Can load heap dumps, JDK Flight Recordings, and coredumps

## VisualVM Updates ⭐️ See [Releases page](https://visualvm.github.io/releases.html) for noteable changes.

## [Jolokia](https://jolokia.org) * Alternative to JSR-160 connectors * Allows JMX over HTTP communication * Recent releases of JDK Mission Control 9.1 and VisualVM 2.2 have added support

Demo 🚀

## OpenTelemetry 🔭 (shout-out) <br /> ⭐️ [Java Support](https://opentelemetry.io/docs/languages/java/) <small>📄 License: Apache 2.0</small>

## ✅ ## Recap * JDK Mission Control * Eclipse Memory Analyzer * VisualVM * OpenTelemetry * Learn more with [jvmperf.net](https://jvmperf.net)

Thank you! 🎉

Carl Chesser
@che55er | che55er.io