JShell: An Interactive Shell for the Java Platform
summary
JShell brings a real REPL to the JDK (ships with JDK 9), claiming live evaluation of Java snippets without new syntax. It is built on javac and the JVM, runs code in a remote JVM via JDI so crashes don’t kill the shell, and exposes a reusable JShell API + command-line tool with an SPI for alternate execution engines. Interactive features include tab completion and an edit mode, startup imports, persistent settings, temporary variables for results, and limitations (no top-level package or static modifiers).
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chapters (16)
- 0:00Start
- 1:09Survey • Who has heard of JShell before this Devoxx?
- 1:39What is JShell?
- 3:26What is JShell NOT?
- 4:10Who wants JShell?
- 6:23With JShell: example
- 7:05Using the JShell tool
- 7:47Snippets
- 11:48set sub-commands
- 13:46Completion / Information / Control - snippet and command completion
- 15:52Line Editing (based on JLine 2.0) • Navigation - enters typed or history entry - navigate line and history
- 26:19JShell Guiding Principles
- 27:39JShell Architecture
- 29:48JShell module: JShell APIs, SPI, and library
- 39:57JDK 9/JShell Information
- 41:11The Team
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