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Instance field used before initialization

Reports instance variables that are read before initialization.

The inspection ignores equality checks with null.


class Foo { int bar; Foo() { System.out.println(bar); } }

Note that this inspection uses a very conservative dataflow algorithm and may incorrectly report instance variables as uninitialized. Variables reported as initialized will always be initialized.

Locating this inspection


Can be used to locate inspection in e.g. Qodana configuration files, where you can quickly enable or disable it, or adjust its settings.

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 | Initialization

Use the Ignore if annotated by option to specify special annotations. The inspection will ignore fields annotated with one of these annotations.

Use the Ignore primitive fields option to ignore uninitialized primitive fields.

Inspection options

Here you can find the description of settings available for the Instance field used before initialization inspection, and the reference of their default values.

Ignore if annotated by


Ignore primitive fields

Not selected


By default bundled with

IntelliJ IDEA 2024.1, Qodana for JVM 2024.1,

Can be installed with plugin

Java, 241.18072

Last modified: 18 June 2024