Extension property conflicting with synthetic one

Reports extension properties that conflict with synthetic ones that have been automatically produced from Java get or set methods.

Such properties should be either removed or renamed to avoid breaking code by future changes in the compiler.

The quick-fix deletes an extention property.

Example:

  val File.name: String
      get() = getName()

The quick-fix adds the @Deprecated annotation:

  @Deprecated("Is replaced with automatic synthetic extension", ReplaceWith("name"), level = DeprecationLevel.HIDDEN)
  val File.name: String
      get() = getName()

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.

ConflictingExtensionProperty

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 | Probable bugs

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 ConflictingExtensionProperty

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