This inspection warns about useless Stream or Optional calls like map(x -> x) or filter(x -> true), useless sorted or distinct.

Note that a mapping operation in code like streamOfIntegers.map(Integer::valueOf) works as requireNonNull check: if stream contains a null, it will throw NullPointerException, thus it's not absolutely useless. Uncheck the "Report useless boxing in Stream.map" checkbox if you don't want such cases to be reported.

This inspection is available since Java 8 only.

New in 2017.1