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Bug 257855 - Unnecessary compiler warning when lambda parameter is not used
Summary: Unnecessary compiler warning when lambda parameter is not used
Status: NEW
Alias: None
Product: java
Classification: Unclassified
Component: Compiler (show other bugs)
Version: 8.1
Hardware: PC Windows 10
: P3 normal (vote)
Assignee: Dusan Balek
Depends on:
Reported: 2016-02-04 22:18 UTC by lukas.eder
Modified: 2016-11-25 10:03 UTC (History)
1 user (show)

See Also:
Issue Type: DEFECT
Exception Reporter:


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Description lukas.eder 2016-02-04 22:18:38 UTC
The following code produces a warning on the parameter "a":

Stream.of(1, 2).filter(a -> true);
Stream.of(1, 2).filter((Integer a) -> true);

The following code, however, doesn't:

Stream.of(1, 2).filter(new Predicate<Integer>() {
    public boolean test(Integer a) {
        return true;

The warning is not really necessary. It would be better not to report it (or at least make reporting it an option, and not report it by default)