Not-null assertion can be replaced with 'return'

Reports not-null assertion (!!) calls that can be replaced with the elvis operator and return (?: return).

A not-null assertion can lead to NPE (NullPointerException) that is not expected. Avoiding the use of !! is good practice.

The quick-fix replaces the not-null assertion with return or return null.

Example:

  fun test(number: Int?) {
      val x = number!!
  }

After the quick-fix is applied:

  fun test(number: Int?) {
      val x = number ?: return
  }

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.

ReplaceNotNullAssertionWithElvisReturn

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 | Kotlin | Style issues

Last modified: 18 June 2024