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 Java security analyses. His work today comprises many open-source contributions and his blog, where he regularly writes on in-depth profiling and debugging topics. He also works on hello-ebpf, the first eBPF library for Java.
Since 2023, he's been touring Europe's Java User Groups and conferences, like JavaZone and Devoxx Belgium, to speak on various topics.
Ever wonder how libraries like Spring, Mockito, and JaCoCo add arbitrary behavior to existing objects or even modify them altogether? We’ll demystify class generation and transformation in Java, exploring how the JVM allows us to dynamically generate and modify code for instrumentation.
Through concrete examples from real-world applications, we'll uncover how these techniques enhance and instrument Java code, from creating dynamic proxies to altering bytecode at runtime. You’ll gain an inside look at decompiled bytecode to understand the magic happening behind the scenes.
By the end of this session, you'll see how Java agents and instrumentation can streamline your development process and make code manipulation both effective and enjoyable.
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