Jenkins understands analysis reports of the following duplicate code detection tools:

• PMD's Copy Paste Detector (CPD)
• Simian

When this option is configured Jenkins shows the analysis results in different views: historical result trend, module and package statistics, web UI for viewing analysis reports and warnings, and so on.

You need to set up your build to run the duplicate code checker in order to use this feature - this Jenkins plug-in does not perform the actual analysis! This plug-in is not invoked for failed builds, it is only called for stable or unstable builds (i.e., a build with failed tests).