Title: Class Data Sharing - Sharing Economy in the HotSpot VM Abstract: Class Data Sharing (CDS) is a feature that was introduced in Java 5 to improve startup performance and reduce the memory footprint of the JVM by sharing the metadata of system classes between virtual machines running on the same host. During the last years, this feature has been constantly improved. In OpenJDK 10 CDS will be extended by AppCDS which additionally allows the sharing of application classes between VM instances (see JEP 310: Application Class-Data Sharing [1]). In this talk I will briefly introduce CDS and AppCDS. After demonstrating its various use cases, I will do a short deep-dive into the implementation details and challenges. Finally I will briefly describe how Strings and Symbols can be stored in the CDS archive and shared across VM as well since OpenJDK 9. After the talk, the audience should have a better understand of the CDS/AppCDS feature and be able to decide whether it makes sense to use it for their own applications. [1] http://openjdk.java.net/jeps/310 Recording me on video and/or audio under CC-BY-2.0 license is OK. Bio: Volker Simonis works in SAP JVM Technology group. He is an OpenJDK contributor from the very beginning and helped SAP to engage in the OpenJDK project. He's the project lead of the OpenJDK PowerPC/AIX and s390x porting projects, a JDK reviewer and JCP Executive Committee representative for SAP. He's also a member of the JCP JSR 379 (Java SE 9) and JSR 383 (Java SE 10) Expert Groups.