Explore the evolution of Spring Framework 5.0 and its compatibility with JDK 8 and 9 in this comprehensive conference talk. Dive into the benefits of adopting a JDK 8 baseline and understand the challenges frameworks face when transitioning to JDK 9. Learn about Java 8's dominance, the revisited code base, and new features like default methods and programmatic registration. Discover the intricacies of reactive programming, router functions, and reactive streams. Gain insights into JDK 9 modules, internal module graphs, and the Spring Framework 5 module path. Receive concrete advice for upgrading Spring applications to JDK 9, considering both classpath and module path (Jigsaw) approaches. Evaluate the benefits and tradeoffs involved in this transition, equipping yourself with the knowledge to make informed decisions about adopting these technologies in your projects.