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Extension class is a Kotlin object

Reports extensions which are instantiated by the IntelliJ Platform, but are declared as Kotlin objects.

Extensions lifecycle is managed by the IntelliJ Platform. Using Kotlin objects for extension registration may cause creation of unnecessary extension instances and make plugin unloading impossible.


Extension registration:

<annotator language="myLang" implementationClass="com.example.MyAnnotator"/>

Extension implementation:

// bad: object MyAnnotator : Annotator { ... } // good: class MyAnnotator : Annotator { ... }

New in 2023.1

Inspection Details

Available in:

IntelliJ IDEA 2023.3, Qodana for JVM 2023.3


Plugin DevKit, 233.SNAPSHOT

Last modified: 13 July 2023