Java 21

• String Template

Invalid source release when using Intellij

When using intellij after upgrading project JDK and settings, you may still see Cause: error: invalid source release: 21. You need to update the JVM used by gradle as well under Settings -> Build, Execution, Deployment -> Build Tools -> Gradle -> Gradle JVM.

Source: https://stackoverflow.com/questions/69696321/intellij-invalid-source-release-17