Explore the process of migrating real Java server applications to Java 11 in this informative conference talk from Devoxx Poland 2019. Learn about the motivations behind the migration, the steps taken, and what wasn't necessary. Gain valuable insights into handling big changes, removed features, pre-deprecated elements, and modules. Discover how to address challenges like Jar Hell, modularity, and missing classes. Understand configuration adjustments, including Java List, Java Modules, and Patch Module options. Examine code examples, Gradle build modifications, and performance analysis using Flight Recorder. Get practical tips on handling external dependencies, unit tests, and scripts. Dive into new features like JShell and JavaScript source support, and learn about container constraints and Unicode handling in Java 11.