Explore the intricacies of Java bytecode and its impact on code coverage in this 46-minute conference talk from YOW! Australia 2023. Dive into bytecode pattern matching and discover how different compiler versions transform source code, focusing on the implementation details of JaCoCo, a popular open-source code coverage tool for Java. Learn how JaCoCo identifies and filters out compiler-generated artifacts to achieve more accurate code coverage results. Follow along as the speaker demonstrates real-world examples, discusses synthetic methods, and provides insights into the challenges of Java code coverage. Gain a deeper understanding of Java bytecode, compiler behavior, and effective code coverage strategies to improve your Java development practices.