JCON 2021

Java Byte code is OS independent, which means your application's startup takes more time than a native image. Using the Class Data Sharing functionality introduced in more recent versions of the JVM, you can prepare your application to load very fast. In this presentation, I'll go into more detail about what Class Data Sharing is and the differences between the OpenJDK and OpenJ9 versions. Using some Jakarta EE demo applications, you will see gains that you can achieve and reduce memory footprint in Docker containers by sharing memory.