Redundant step in 'Stream' or 'Optional' call chain

Last modified: 03 December 2024

Reports redundant Stream or Optional calls like map(x -> x), filter(x -> true) or redundant sorted() or distinct() calls.

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.

RedundantStreamOptionalCall
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 | Verbose or redundant code constructs

Note that a mapping operation in code like streamOfIntegers.map(Integer::valueOf) works as requireNonNull() check: if the stream contains null, it throws a NullPointerException, thus it's not absolutely redundant. Disable the Report redundant boxing in Stream.map() option if you do not want such cases to be reported.

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

Inspection options

Here you can find the description of settings available for the Redundant step in 'Stream' or 'Optional' call chain inspection, and the reference of their default values.

Report redundant boxing in Stream.map()

Default: Selected

Inspection Details

By default bundled with:

IntelliJ IDEA 2024.3, Qodana for JVM 2024.3,

Can be installed with plugin:

Java, 243.23126