Java has had something a bit REPL-like for a while in the form of Java BeanShell, but this project was never a fully featured REPL on par with those of other languages.

"What is an REPL?" you ask. An REPL is a command-line tool for quickly running statements. In my description, the word "statements" is important. In Java, you normally don't run a single statement or ...

While a REPL is certainly possible for Java, it won’t be as useful as for an expression-oriented language.” Facemire, however, expects REPL to “be in vogue before you know it,” with new ...

Voting on the project begins on Sept 10. If approved, it will use code cloned from JDK 9 to create the Java REPL tool. More information can be found on Project Kulla’s discussion thread.