Related issue in Bamboo: BAM-14734

It's documented here:

• https://confluence.atlassian.com/display/CLOVER/clover-report#clover-report-Columns

ncLineCount

The total number of non-comment lines.
(info) When using Clover on Groovy source code, this column consistently reports '0' at the moment.

and here:

• https://confluence.atlassian.com/display/CLOVER/'Current'+Report

Number of Non-commented Lines of Code (NCLOC)

(info) This information is currently not available with Clover reports on Groovy code.

In addition to the above, I added a warning also on this page:

• https://confluence.atlassian.com/display/CLOVER/About+Clover+code+metrics

NCLOC
Non-Commented Lines Of Code. Lines of code that contain comments are not counted in this metric, leaving only the actual functioning code itself.

Warning Clover currently does not calculate NCLOC for Groovy code (CLOV-1805).

Thanks for the feedback. Since it really isn't easy to support this feature maybe add a warning or something to the metrics explaining that this isn't supported for Groovy? Or possible I missed this. We are slowly converting our application from Java to Groovy and I didn't realize this metric wasn't meaningful anymore until a lot of the code was converted and the metrics started getting really skewed.

Thank you for your report, unfortunately this metric is not being calculated for Groovy code because Clover instruments Groovy on AST tree level. At that point information about comments is lost. There may be a way to hook in Groovy compilation at earlier phases and calculate this metric, but at this point I'm not sure if it's possible.

I've modified this issue to improvement to add NCLOC to Groovy code, you can track its progress, but taking into consideration our current road map I don't think we're going to address that in foreseeable future. You should get mail notification from JIRA system in case of any updates.

Cheers,
Grzegorz Lewandowski