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Usage of Kotlin internal declarations from Java

Reports usages of Kotlin internal declarations in Java code that is located in a different module.

The internal keyword is designed to restrict access to a class, function, or property from other modules. Due to JVM limitations, internal classes, functions, and properties can still be accessed from outside Kotlin, which may later lead to compatibility problems.

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.

KotlinInternalInJava
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 | Java interop issues

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 KotlinInternalInJava

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

Inspection Details

By default bundled with:

IntelliJ IDEA 2025.2, Qodana for JVM 2025.2,

Last modified: 18 September 2025