Exclusion Builder is a prototype builder project. The goal was to create a builder that could analyze a Java file and flag certain method calls as Errors or Warnings, similar to deprecation. This is useful if coding standards disallow certain methods, or if certain API's are not implemented completely and should not be used.
This is a good project to look at if you want an introduction to Natures, Builders, and AST, as it uses all three in a standard way. Exclusion Builder is fully functional, but not perceived to be of general interest. If you are interested in using or extending it, send a note to: Zclipse-devel@lists.sourceforge.net