The document describes a presentation given by Miro Cupak on exploring Java 9 features using REPL (Read-Eval-Print Loop). The presentation covered new Java 9 APIs such as Collection, Stream, CompletableFuture, Optional, Stackwalker, Process, and HTTP/2 Client. It also covered JShell, a tool for interacting with Java code. The presentation included a live demo and took questions from the audience. More information was available through session notes on Twitter and the speaker's blog.