How to Enable Java 21 Preview Features in IntelliJ IDEA 2023.2
This guide explains why Java preview features are disabled by default, and provides step‑by‑step instructions with screenshots for configuring IntelliJ IDEA 2023.2 to enable the --enable-preview flag so you can run and test Java 21 preview language features.
Enabling Java Preview Features in IntelliJ IDEA 2023.2
Each new Java release includes Preview features that are not enabled by default; to use them you must adjust IDE settings.
Step 1: Configure Compiler Settings
Open Settings, select the desired Java version, and add the compiler option --enable-preview.
Step 2: Configure Run/Debug VM Options
In the Run/Debug configuration, add the VM option --enable-preview.
After these changes, running your code will include the --enable-preview flag and the preview features will work correctly.
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Programmer DD
A tinkering programmer and author of "Spring Cloud Microservices in Action"
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