Instance initializer can be made 'static'

Reports instance initializers which can be made static without producing any errors.

An instance initializer may be static if it does not reference any of its class' non-static members. Static initializers are executed once when the class is resolved, while instance initializers are executed on each instantiation of the class.

This inspection doesn't report instance empty initializers and initializers in anonymous classes.

Example:

  class A {
     public static String CONSTANT;
     {
        CONSTANT = "Hello";
     }
  }

After the quick-fix is applied:

  class A {
     public static String CONSTANT;
     static {
        CONSTANT = "Hello"; //now initialized only once per class
     }
  }

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.

ClassInitializerMayBeStatic

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 | Performance

Inspection ID: ClassInitializerMayBeStatic

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 ClassInitializerMayBeStatic

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