Type parameter extends 'final' class

Reports type parameters declared to extend a final class.

Suggests replacing the type parameter with the type of the specified final class since final classes cannot be extended.

Example:

  void foo() {
    List<? extends Integer> list; // Warning: the Integer class is a final class
  }

After the quick-fix is applied:

  void foo() {
    List<Integer> list;
  }

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.

TypeParameterExtendsFinalClass

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 | Java | Inheritance issues

This inspection depends on the Java feature 'Generics', which is available since Java 5.

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 TypeParameterExtendsFinalClass

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