Java9 and REPL. Forget debugging, welcome joy and productivity
summary
Java 9’s REPL JShell lets code run interactively: try new APIs like List.of and optional-to-stream flatMap, edit and save snippets, load a classpath and spin up a tiny web server with Spark Java to expose REST endpoints, then iterate live. It supports running saved scripts, launching the same code outside the shell, and programmatic DI: registerBean calls create Spring 5 beans (including prototype scope) inside the shell so a full app can be bootstrapped and probed in real time.
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chapters (8)
- 0:00Introduction to JShell
- 5:16Starting JShell demo
- 8:55Java 9 new features
- 16:11Building web app with Spark
- 25:23Prototyping with JShell script
- 31:20Spring 5 in JShell
- 37:30Debugging JShell issues
- 40:10Future of JShell
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