Enable Java 21 Preview Features in IntelliJ IDEA 2023.2
This guide explains how to enable Java 21 preview features in IntelliJ IDEA 2023.2 by configuring compiler and runtime options, allowing developers to experiment with upcoming language capabilities such as unnamed classes, patterns, and virtual threads.
Each new Java release includes Preview features that are not enabled by default, allowing developers to try them and provide feedback.
To use a Preview feature in a specific Java version, you must configure your IDE and runtime accordingly.
Below is a step‑by‑step guide for enabling Preview features of Java 21 in IntelliJ IDEA 2023.2.
Step 1: Configure compiler settings
Open Settings, select the desired Java version, and add the compiler option --enable-preview as shown in the screenshot.
Step 2: Configure Run/Debug VM options
In the Run/Debug configuration, add the VM option --enable-preview.
When you run your test code, the --enable-preview flag will be present, and the Preview feature will work correctly.
Recommended Reading
Java 21 New Feature: Unnamed Classes and Instance Main Methods – http://mp.weixin.qq.com/s?__biz=MzAxODcyNjEzNQ==∣=2247579672&idx=1&sn=01012855143d177725d027dcc0d85eed
Java 21 New Feature: Unnamed Patterns and Variables – http://mp.weixin.qq.com/s?__biz=MzAxODcyNjEzNQ==∣=2247579672&idx=2&sn=f718dbe72feafb5e64d296d67be0c78b
Java 21 New Feature: Virtual Threads – http://mp.weixin.qq.com/s?__biz=MzAxODcyNjEzNQ==∣=2247579656&idx=1&sn=48fcc1d0d53a78f0ec4aec4103aa1163
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Programmer DD
A tinkering programmer and author of "Spring Cloud Microservices in Action"
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