Krakow, Poland, 31 May - 2 June 2023

Evgeny Mandrikov
Evgeny is a contributor to various open source projects, including OpenJDK, and a speaker at international conferences and JUGs. He is also one of the project leads of widely adopted code coverage tool for Java and Kotlin - JaCoCo, and the award-winning EclEmma project at the Eclipse Foundation that integrates JaCoCo into Eclipse. In his day job at SonarSource Evgeny develops SonarQube’s static source code analysis for languages such as Java, C/C++, C#, JavaScript.

Do you know what is inside of your class files? Are you ready to bet? Let's have fun by diving into bytecode pattern matching and explore how different compilers (Java/Kotlin) and their different versions, from the old ones up to the most recent, transform your source code.

Our dive will be based on details of the implementation of the most popular open-source code coverage tool for Java – JaCoCo ( ), which finds in bytecode and filters out various compiler generated artifacts, which otherwise require unnecessary and sometimes impossible tricks to have full code coverage.

Dynamic Constants — oxymoron or promising JVM feature?
Conference (INTERMEDIATE level)
Room 4B

New JVM features now arrive with each JDK release. If you are interested to learn and try these new features and wanna know-how in case of problems investigate and report JVM crashes, then come to listen about its new feature introduced in Java 11 - Constant Dynamic. During this talk, we'll see what actually means dynamic constant and why it is such a powerful addition to JVM. We'll also see how little holes in implementation were causing JVM crashes in OpenJ9 and OpenJDK 11-14, and how by developing JaCoCo we find and report such bugs - you also can!


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Venue address

ICE Krakow, ul. Marii Konopnickiej 17


+48 691 793 877


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