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:

Extension implementation:

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

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

Locating this inspection

By ID

Can be used to locate inspection in e.g. Qodana configuration files, where you can quickly enable or disable it, or adjust its settings.

KotlinObjectExtensionRegistration

Via Settings dialog

Path to the inspection settings via IntelliJ Platform IDE Settings dialog, when you need to adjust inspection settings directly from your IDE.

Settings or Preferences | Editor | Inspections | Plugin DevKit | Plugin descriptor

New in 2023.1

Suppressing Inspection

You can suppress this inspection by placing the following comment marker before the code fragment where you no longer want messages from this inspection to appear:

//noinspection KotlinObjectExtensionRegistration

More detailed instructions as well as other ways and options that you have can be found in the product documentation:

IntelliJ IDEA 2025.2

Inspection Details
By default bundled with:	IntelliJ IDEA 2025.2, Qodana for JVM 2025.2,

Last modified: 18 September 2025