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This JEP might affect source code that uses underscore ("_") as an identifier. Its use generated a warning as of Java SE 8, and has been turned into an error in JDK 9.

New JDK 9 features

REPL (aka Project Kulla)

Project Kulla introduces a new REPL for Java 9.  You can test this by following the instructions from the latest Adoption Group hackday.

Other potential changes to consider

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