Type parameter explicitly extends 'Object'

Reports type parameters and wildcard type arguments that are explicitly declared to extend java.lang.Object.

Such 'extends' clauses are redundant as java.lang.Object is a supertype for all classes.

Example:

class ClassA<T extends Object> {}

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.

TypeParameterExplicitlyExtendsObject

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 | Code style issues

If you need to preserve the 'extends Object' clause because of annotations, disable the Ignore when java.lang.Object is annotated option. This might be useful, for example, when you use a nullness analyzer, and the 'extends Object' clause holds a @Nullable/@NotNull annotation.

Example:

class MyClass<T extends @NotNull Object> {}

Inspection ID: TypeParameterExtendsObject

Inspection options

Here you can find the description of settings available for the Type parameter explicitly extends 'Object' inspection, and the reference of their default values.

Ignore when java.lang.Object is annotated

Option ID:

ignoreAnnotatedObject

Default value:

Selected

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 TypeParameterExplicitlyExtendsObject

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

IntelliJ IDEA 2025.3

Inspection Details
By default bundled with:	IntelliJ IDEA 2025.3, Qodana for JVM 2025.3,

Last modified: 03 December 2025