The Rebuild plugin in jenkins fails to rebuild a job when it contains a hidden string parameter that contains the character string "MultiJobBuildSelector" in the default value field. For a simple reproducible example do the following:

• install the following plugins: copy artifact, rebuild, hidden parameter
• create a new job with the following configuration:
  • Add a parameter of type "hidden" with an arbitrary name and a defult value of "MultiJobBuildSelector"
• save the job and run it once
• select the build that just completed and click the "rebuild" link

This produces the following error (see attached screenshot):

This is fragile for those rare cases when a hidden parameter actually does need to contain that exact string, but it is also problematic when one wants to have a hidden job parameter to control which build the copy artifact plugin should use.

I would suggest two changes here:

1. modify the logic of the multijob build selector to look for an exact match for the XML configuration needed to correctly populate a build selector parameter (avoiding accidental matches )
2. modify the rebuild logic so that when a hidden parameter contains this exact XML that it correctly instantiates the multijob build selector so copy artifacts will work correctly when rebuilt using a hidden string parameter