QuickShell is an Eclipse plugin to use java jshell inside Eclipse IDE. JDK 9+ is not installed on your system? No worries, you can still use QuickShell using external unzipped JDK. So without disturbing your existing project setup, you can use QuickShell.

• Download plugin JAR file and put into your Eclipse plugin directory "$ECLIPSE_HOME/plugins" . Restart eclipse.
• Go to Eclipse menu, Window -> Preferences -> QuickShell Settings and click on browse to select jshell executable present in JDK installation directory.(JDK 9+) ( jshell.exe in Windows). See screenshot below :

Note : Even though you are using older JDK for running eclipse, you can still use this plugin by using external JDK. For this you can download JDK9+ from https://jdk.java.net/archive/ unzip it somewhere and select path of jshell executable in setting specified above.

Select your existing code in java editor and click on right-click menu QuickShell -> Run as JShell script.

Create a file with extension .jsh. for example test.jsh and right-click on it and click on the pop-up menu QuickShell -> Run JShell Script. Check the screenshot below:

Click on eclipse menu QuickShell -> Start JShell in Eclipse Terminal. This will open jshell in eclipse terminal.

Click on eclipse menu QuickShell -> Start JShell Executable. This will call jshell executable in a separate window. (Note: This is a platform-dependent feature it may not be supported on your operating system or it may not work on your operating system. I have tested on Windows and it is working as expected. I am trying to support other OS in next releases.