How can I disable checkstyle warnings for missing final modifiers on lambdas?

Question

I am getting checkstyle warnings for missing final modifiers when writing lambdas in Java 8. I want the warnings when writing normal methods, but not in lambdas.

For example, summing a list of BigDecimals like this:

values.stream().reduce(BigDecimal.ZERO, (a, b) -> a.add(b));

gives me the following checkstyle warnings:

- Variable 'a' should be declared final.
- Variable 'b' should be declared final.

Is there a way to make Checkstyle ignore this only when writing lambdas?

Answer 1

What version of checkstyle are you running. This should have been fixed in version 6.5, so if you are running an earlier version it's a known bug.

source: https://github.com/checkstyle/checkstyle/issues/747