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'Optional' contains array or collection

Reports java.util.Optional or types with an array or collection type parameter.

In such cases, it is more clear to just use an empty array or collection to indicate the absence of result.


Optional<List<Integer>> foo() { return Optional.empty(); }

This code could look like:

List<Integer> foo() { return List.of(); }

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 | Code style issues

This inspection depends on the Java feature 'Stream and Optional API' which is available since Java 8.


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