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

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

Note that a mapping operation in code like 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 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

Default: Selected

Inspection Details

By default bundled with:

IntelliJ IDEA 2024.1, Qodana for JVM 2024.1,

Can be installed with plugin:

Java, 241.16690

Last modified: 29 April 2024