Johannes Bechberger
Johannes Bechberger is a JVM developer working on profilers and their underlying technology in the SapMachine team at SAP. This includes improvements to async-profiler and its ecosystem, a website to view the different JFR event types, and improvements to the FirefoxProfiler, making it usable in the Java world. He started at SAP in 2022 after two years of research studies at the KIT in the field of Java security analyses. His work today is comprised of many open-source contributions and his blog, where he writes regularly on in-depth profiling and debugging topics, and of working on his JEP Candidate 435 to add a new profiling API to the OpenJDK.
Vorträge
Have you ever written a Java agent? This talk will give you an introduction into writing small custom Java agents to create profilers or help with dead code removal.
I'll present you with all the techniques to write a Java agent and javassist based instrumentation code to find unused classes and dependencies in your project. Knowing which classes and dependencies are not used in your application can save you from considering the bugs and problems in these dependencies and classes if you remove them, helping you against supply chain attacks.
Java agents and instrumentation of a few lines of code can save you a lot of effort and implementing them is great fun :)
Have you ever written a Java agent? This talk will give you an introduction into writing small custom Java agents to create profilers or help with dead code removal.
I'll present you with all the techniques to write a Java agent and javassist based instrumentation code to find unused classes and dependencies in your project. Knowing which classes and dependencies are not used in your application can save you from considering the bugs and problems in these dependencies and classes if you remove them, helping you against supply chain attacks.
Java agents and instrumentation of a few lines of code can save you a lot of effort and implementing them is great fun :)
Profilers are great tools in your toolbox, like debuggers, when solving problems with your Java application (I've been on a podcast on this topic recently). I'll tell you some of their problems and a technique to cope with them in this talk.
There are many open-source profilers, most notably JFR/JMC, and async-profiler, that help you to find and fix performance problems. But they are just software themself, interwoven with a reasonably large project, the OpenJDK (or OpenJ9, for that matter), and thus suffer from the same problems as the typical problems of application they are used to profile.