It marks the autogenerated files as derived, and hides the java compilation warnings in the autogenerated files. The first time a file is generated, you must mark it as being autogenerated.
Install: Extract the file into the plugins directory
Activate: In project's properties page, you can enable the plugin,
and also enable the deletion of autogenerated files that are marked as derived.
For each file, you can mark it as being autogenerated. If you want to have only
some of the functionality (only mark it as derived, or only hide java warnings)
clear the top checkbox and check only the desired functionality.
Note: It cannot handle the directories recursively yet.